2018Article de journal ER2 Auteurs : Nguyen, T -K; Carpentier, Olivier; Monchau, Francine; Chai, F; Hornez, J C; Hivart, Philippe Numerical optimization of cell colonization modelling inside scaffold for perfusion bioreactor: A multiscale model Dans: Medical Engineering and Physics, vol. 57, p. 40-50, 2018, (cited By 4). Liens @article{Nguyen201840,
title = {Numerical optimization of cell colonization modelling inside scaffold for perfusion bioreactor: A multiscale model},
author = {T -K Nguyen and Olivier Carpentier and Francine Monchau and F Chai and J C Hornez and Philippe Hivart},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85046702227&doi=10.1016%2fj.medengphy.2018.04.012&partnerID=40&md5=432916873ff02303a4ae60d059a30466},
doi = {10.1016/j.medengphy.2018.04.012},
year = {2018},
date = {2018-01-01},
journal = {Medical Engineering and Physics},
volume = {57},
pages = {40-50},
note = {cited By 4},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
2016Article de journal ER2 Auteurs : Aubrun-Fillâtre, Celine; Monchau, Francine; Hivart, Philippe Acrylic bone cement and starch: Botanical variety impact on curing parameters and degradability Dans: Materials Science and Engineering: C, vol. 69, p. 1328-1334, 2016, ISSN: 0928-4931, (ACL). Résumé | Liens @article{AUBRUNFILLATRE20161328,
title = {Acrylic bone cement and starch: Botanical variety impact on curing parameters and degradability},
author = {Celine Aubrun-Fillâtre and Francine Monchau and Philippe Hivart},
url = {https://www.sciencedirect.com/science/article/pii/S0928493116307883},
doi = {10.1016/j.msec.2016.08.023},
issn = {0928-4931},
year = {2016},
date = {2016-01-01},
journal = {Materials Science and Engineering: C},
volume = {69},
pages = {1328-1334},
abstract = {Acrylic bone cements are a conventional solution to heal bone defects. Starch is often added to the cement to improve its degradability and resorbability. The most used botanical variety is corn starch; few studies or applications deal with other varieties. This study focuses on classical formulations based on 2-hydroxyethylmethacrylate but incorporating different starches: waxy maize, corn, amylo maize, wheat, pea or potato, with or without enzyme (α-amylase). A thermocouple is used to determine the curing parameters: setting time and maximal temperature. The water uptake depends on the cement immersion time in a biological fluid and it is studied through sample mass variation analysis. The weight loss is determined after immersion (function of the time) and drying. Starch botanical variety and enzyme presence do not impact curing parameters and water uptake but strongly influence degradability. Water uptake involves advantageous swelling in situ filling the defect. This study shows that starch accessibility by the enzyme explains this impact. Grain spatial configuration, specific surface area and starch distribution in cement give a complementary explanation of the well-known influence of the ratio amylopectin/amylose. Acrylic cements incorporating starch can be classified according to their degradability.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
Acrylic bone cements are a conventional solution to heal bone defects. Starch is often added to the cement to improve its degradability and resorbability. The most used botanical variety is corn starch; few studies or applications deal with other varieties. This study focuses on classical formulations based on 2-hydroxyethylmethacrylate but incorporating different starches: waxy maize, corn, amylo maize, wheat, pea or potato, with or without enzyme (α-amylase). A thermocouple is used to determine the curing parameters: setting time and maximal temperature. The water uptake depends on the cement immersion time in a biological fluid and it is studied through sample mass variation analysis. The weight loss is determined after immersion (function of the time) and drying. Starch botanical variety and enzyme presence do not impact curing parameters and water uptake but strongly influence degradability. Water uptake involves advantageous swelling in situ filling the defect. This study shows that starch accessibility by the enzyme explains this impact. Grain spatial configuration, specific surface area and starch distribution in cement give a complementary explanation of the well-known influence of the ratio amylopectin/amylose. Acrylic cements incorporating starch can be classified according to their degradability. |
2013Article de journal ER2 Auteurs : Nugyen, Trong-Khoa; Carpentier, Olivier; Herin, Philippe; Hivart, Philippe Numerical Approach of the Permeability of a Macroporous Bioceramic with Interconnected Spherical Pores Dans: Transport in Porous Media, vol. 96 (2), p. pp 255-270, 2013, (ACL). @article{nguyen2013a,
title = {Numerical Approach of the Permeability of a Macroporous Bioceramic with Interconnected Spherical Pores},
author = {Trong-Khoa Nugyen and Olivier Carpentier and Philippe Herin and Philippe Hivart},
year = {2013},
date = {2013-01-01},
journal = {Transport in Porous Media},
volume = {96 (2)},
pages = {pp 255-270},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
2013Article de journal ER2 Auteurs : Monchau, Francine; Hivart, Philippe; Genestie, Benoit; Chai, F; Descamps, M; Hildebrand, H F Calcite as a bone substitute. Comparison with hydroxyapatite and tricalcium phosphate with regard to the osteoblastic activity Dans: Materials Science and Engineering: C, vol. 33, no. 1, p. 490–498, 2013. Liens @article{Monchau2013,
title = {Calcite as a bone substitute. Comparison with hydroxyapatite and tricalcium phosphate with regard to the osteoblastic activity},
author = {Francine Monchau and Philippe Hivart and Benoit Genestie and F Chai and M Descamps and H F Hildebrand},
doi = {10.1016/j.msec.2012.09.019},
year = {2013},
date = {2013-01-01},
journal = {Materials Science and Engineering: C},
volume = {33},
number = {1},
pages = {490--498},
publisher = {Elsevier BV},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
2012Article de journal ER2 Auteurs : Debarre, Etienne; Hivart, Philippe; Baranski, Didier; Déprez, Pascal Le prototypage rapide, une aide au diagnostic en chirurgie orthopédique et traumatologique. Méthodologie et exemples d’applications cliniques Dans: Revue de Chirurgie Orthopédique et Traumatologique, vol. 98, no. 5, p. 519-524, 2012, ISSN: 1877-0517, (ACL). Résumé | Liens @article{DEBARRE2012519,
title = {Le prototypage rapide, une aide au diagnostic en chirurgie orthopédique et traumatologique. Méthodologie et exemples d’applications cliniques},
author = {Etienne Debarre and Philippe Hivart and Didier Baranski and Pascal Déprez},
url = {https://www.sciencedirect.com/science/article/pii/S1877051712002420},
doi = {10.1016/j.rcot.2012.06.061},
issn = {1877-0517},
year = {2012},
date = {2012-01-01},
journal = {Revue de Chirurgie Orthopédique et Traumatologique},
volume = {98},
number = {5},
pages = {519-524},
abstract = {Résumé
Complétant l’imagerie médicale, une réplique 3D d’une zone anatomique d’intérêt peut être un avantage non négligeable en chirurgie orthopédique et traumatologique. À la différence du 3D virtuel, elle rend palpable la notion d’échelle et de volume, apparents des détails cachés ou ambigus, ainsi facilitant le diagnostic et la solution chirurgicale. Les données tomodensitométriques du patient, au standard DICOM3, sont exploitées pour une reconstruction 3D numérique suivie d’un prototypage rapide par dépôt de fil fondu d’une réplique en acrylonitrile-butadiène-styrène (ABS) de la zone concernée. Trois applications sont présentées : ostéotomie de cal vicieux épiphysaire, arthroplastie d’épaule et trochléoplastie fémorale. La taille réelle des répliques (réalisées en moins de 30heures) permet une excellente représentation spatiale avec estimation du stock osseux disponible et matérialisation du relief. Le procédé s’avère pertinent (et raisonnable du point de vue économique), même dans les cas courants, dès qu’il est question de géométrie complexe et de représentation objective de l’échelle des volumes.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
Résumé
Complétant l’imagerie médicale, une réplique 3D d’une zone anatomique d’intérêt peut être un avantage non négligeable en chirurgie orthopédique et traumatologique. À la différence du 3D virtuel, elle rend palpable la notion d’échelle et de volume, apparents des détails cachés ou ambigus, ainsi facilitant le diagnostic et la solution chirurgicale. Les données tomodensitométriques du patient, au standard DICOM3, sont exploitées pour une reconstruction 3D numérique suivie d’un prototypage rapide par dépôt de fil fondu d’une réplique en acrylonitrile-butadiène-styrène (ABS) de la zone concernée. Trois applications sont présentées : ostéotomie de cal vicieux épiphysaire, arthroplastie d’épaule et trochléoplastie fémorale. La taille réelle des répliques (réalisées en moins de 30heures) permet une excellente représentation spatiale avec estimation du stock osseux disponible et matérialisation du relief. Le procédé s’avère pertinent (et raisonnable du point de vue économique), même dans les cas courants, dès qu’il est question de géométrie complexe et de représentation objective de l’échelle des volumes. |
2012Article de journal ER2 Auteurs : Nguyen, Trong-Khoa; Carpentier, Olivier; Herin, Philippe; Hivart, Philippe Numerical Approach of the Permeability of a Macroporous Bioceramic with Interconnected Spherical Pores Dans: Transport in Porous Media, vol. 96, no. 2, p. 255–270, 2012. Liens @article{Nguyen2012,
title = {Numerical Approach of the Permeability of a Macroporous Bioceramic with Interconnected Spherical Pores},
author = {Trong-Khoa Nguyen and Olivier Carpentier and Philippe Herin and Philippe Hivart},
doi = {10.1007/s11242-012-0086-x},
year = {2012},
date = {2012-10-01},
journal = {Transport in Porous Media},
volume = {96},
number = {2},
pages = {255--270},
publisher = {Springer Science and Business Media LLC},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
2012Article de journal ER2 Auteurs : Debarre, Etienne; Hivart, Philippe; Baranski, D; Déprez, Pascal Speedy skeletal prototype production to help diagnosis in orthopaedic and trauma surgery. Methodology and examples of clinical applications Dans: Orthopaedics & Traumatology: Surgery & Research, vol. 98, no. 5, p. 597–602, 2012. Liens @article{Debarre_2012,
title = {Speedy skeletal prototype production to help diagnosis in orthopaedic and trauma surgery. Methodology and examples of clinical applications},
author = {Etienne Debarre and Philippe Hivart and D Baranski and Pascal Déprez},
doi = {10.1016/j.otsr.2012.03.016},
year = {2012},
date = {2012-09-01},
journal = {Orthopaedics & Traumatology: Surgery & Research},
volume = {98},
number = {5},
pages = {597--602},
publisher = {Elsevier BV},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
2012Article de journal ER2 Auteurs : Duchatel-Crépy, Lucie; Monchau, Francine; Chai, Feng; é, Gw; Hivart, Philippe; Hildebrand, Hartmut F; Martin, Patrick; Joly, Nicolas Evaluation of a bio-based hydrophobic cellulose laurate film as biomaterial-Study on biodegradation and cytocompatibility Dans: Journal of Biomedical Materials Research Part B: Applied Biomaterials, vol. 100B, no. 4, p. 1000–1008, 2012. Liens @article{Crepy2012,
title = {Evaluation of a bio-based hydrophobic cellulose laurate film as biomaterial-Study on biodegradation and cytocompatibility},
author = {Lucie Duchatel-Crépy and Francine Monchau and Feng Chai and Gw é and Philippe Hivart and Hartmut F Hildebrand and Patrick Martin and Nicolas Joly},
doi = {10.1002/jbm.b.32665},
year = {2012},
date = {2012-02-01},
journal = {Journal of Biomedical Materials Research Part B: Applied Biomaterials},
volume = {100B},
number = {4},
pages = {1000--1008},
publisher = {Wiley},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
2009Article de journal ER2 Auteurs : Deprez, Pascal; Hivart, Philippe; Coutouly, J F; Debarre, Etienne Friction and wear studies using Ŧaguchi method: application to thecharacterization of carbon-silicon carbide tribological couples ofautomotive water pump seals. Dans: Advances in Materials Science and Engineering, vol. vol. 2009,, no. article ID830476,, 2009, (ACL). @article{DEPR2009Ab,
title = {Friction and wear studies using Ŧaguchi method: application to thecharacterization of carbon-silicon carbide tribological couples ofautomotive water pump seals.},
author = {Pascal Deprez and Philippe Hivart and J F Coutouly and Etienne Debarre},
year = {2009},
date = {2009-01-01},
journal = {Advances in Materials Science and Engineering},
volume = {vol. 2009,},
number = {article ID830476,},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
2009Article de journal ER2 Auteurs : Hivart, Philippe Un attentat a Porrentruy en l'an V de la Republique ou les demeles du volontaire Kusnick avec le citoyen commissaire Roussel. Actesde la Societe Jurassienne d ÂEmulation (Suisse), 157-172, (200 Dans: 2009, (ACL). @article{HIVART2009b,
title = {Un attentat a Porrentruy en l'an V de la Republique ou les demeles du volontaire Kusnick avec le citoyen commissaire Roussel. Actesde la Societe Jurassienne d ÂEmulation (Suisse), 157-172, (200},
author = {Philippe Hivart},
year = {2009},
date = {2009-01-01},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
2007Article de journal ER2 Auteurs : Hivart, Philippe; Crampon, Jacques Interfacial indentation test and adhesive fracture characteristics of plasma sprayed cermet Cr3C2/Ni–Cr coatings Dans: Mechanics of Materials, vol. 39, no. 11, p. 998-1005, 2007, ISSN: 0167-6636, (ACL). Résumé | Liens @article{HIVART2007998,
title = {Interfacial indentation test and adhesive fracture characteristics of plasma sprayed cermet Cr3C2/Ni–Cr coatings},
author = {Philippe Hivart and Jacques Crampon},
url = {https://www.sciencedirect.com/science/article/pii/S0167663607000646},
doi = {10.1016/j.mechmat.2007.05.002},
issn = {0167-6636},
year = {2007},
date = {2007-01-01},
journal = {Mechanics of Materials},
volume = {39},
number = {11},
pages = {998-1005},
abstract = {Thermal spraying is often used to create coatings protecting parts against physico-chemical aggressions or improving superficial mechanical properties. It involves several problems because of the high temperatures of the process: cracks, porosity, coating adhesion. The authors use Vickers interfacial indentation test to characterize adhesive fracture between substrates and coatings. From the Lawn’s relation two curves: load/crack length ratio (P/C3/2) vs crack length (C1/2) and lnP vs lnC are drawn for varying loads. They allow the determination of the type of residual stress, a coating fracture “toughness”/residual stress ratio (KC/σr) characterizing interfacial behavior and may lead, in some cases, to residual stress σr. Influence of superficial remelting by CO2 laser of cermet coating Cr3C2/Ni–Cr deposited on NiCrAlY covered steel and of annealing of Cr3C2/Ni–Cr coated cast iron are then studied. Possibility of reducing residual stress is shown at the same time as the interest of both approaches.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
Thermal spraying is often used to create coatings protecting parts against physico-chemical aggressions or improving superficial mechanical properties. It involves several problems because of the high temperatures of the process: cracks, porosity, coating adhesion. The authors use Vickers interfacial indentation test to characterize adhesive fracture between substrates and coatings. From the Lawn’s relation two curves: load/crack length ratio (P/C3/2) vs crack length (C1/2) and lnP vs lnC are drawn for varying loads. They allow the determination of the type of residual stress, a coating fracture “toughness”/residual stress ratio (KC/σr) characterizing interfacial behavior and may lead, in some cases, to residual stress σr. Influence of superficial remelting by CO2 laser of cermet coating Cr3C2/Ni–Cr deposited on NiCrAlY covered steel and of annealing of Cr3C2/Ni–Cr coated cast iron are then studied. Possibility of reducing residual stress is shown at the same time as the interest of both approaches. |
1998Article de journal ER2 Auteurs : Hivart, Philippe; Hauw, Benoit; Crampon, Jacques; Bricout, Jean-Paul Annealing improvement of tribological properties of manganese phosphate coatings Dans: Wear, vol. 219, no. 2, p. 195-204, 1998, ISSN: 0043-1648, (ACL). Résumé | Liens @article{HIVART1998195,
title = {Annealing improvement of tribological properties of manganese phosphate coatings},
author = {Philippe Hivart and Benoit Hauw and Jacques Crampon and Jean-Paul Bricout},
url = {https://www.sciencedirect.com/science/article/pii/S0043164898002117},
doi = {10.1016/S0043-1648(98)00211-7},
issn = {0043-1648},
year = {1998},
date = {1998-01-01},
journal = {Wear},
volume = {219},
number = {2},
pages = {195-204},
abstract = {The authors have studied the tribological behaviour of hureaulite coating previously modified by annealing. Hureaulite is a manganese phosphate used as an anti-friction coating on steel parts in relative motion. This coating possesses no intrinsic lubricating characteristics and must therefore be used in combination with a lubricant. It is the response of the tribosystem ‘coating-lubricant’ which is discussed. Using a friction test to determine the seizure resistance, it is shown that the modifications of the coating (dehydration, new phases and new compounds forming) lead to a great improvement in the resistance to seizure whose value is 5 to 10 times higher according to the annealing temperature. The micrographs show that these modifications generate cracks through the crystals; these cracks are perpendicular to the surface and do not lead to scaling phenomenon. They act like lubricant traps and so delay the seizure. Annealing temperatures ranging from 100 to 700°C and treatment duration from 1 to 100 min are studied. The possibility of reducing temperature while reasonably increasing time is shown so the heat treatment does not affect the steel substrate and could be industrialised.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
The authors have studied the tribological behaviour of hureaulite coating previously modified by annealing. Hureaulite is a manganese phosphate used as an anti-friction coating on steel parts in relative motion. This coating possesses no intrinsic lubricating characteristics and must therefore be used in combination with a lubricant. It is the response of the tribosystem ‘coating-lubricant’ which is discussed. Using a friction test to determine the seizure resistance, it is shown that the modifications of the coating (dehydration, new phases and new compounds forming) lead to a great improvement in the resistance to seizure whose value is 5 to 10 times higher according to the annealing temperature. The micrographs show that these modifications generate cracks through the crystals; these cracks are perpendicular to the surface and do not lead to scaling phenomenon. They act like lubricant traps and so delay the seizure. Annealing temperatures ranging from 100 to 700°C and treatment duration from 1 to 100 min are studied. The possibility of reducing temperature while reasonably increasing time is shown so the heat treatment does not affect the steel substrate and could be industrialised. |
1997Article de journal ER2 Auteurs : Hivart, Philippe; Hauw, Benoit; Bricout, Jean-Paul; Oudin, Jerome Seizure behaviour of manganese phosphate coatings according to the process conditions Dans: Tribology International, vol. 30, no. 8, p. 561-570, 1997, ISSN: 0301-679X, (ACL). Résumé | Liens @article{HIVART1997561,
title = {Seizure behaviour of manganese phosphate coatings according to the process conditions},
author = {Philippe Hivart and Benoit Hauw and Jean-Paul Bricout and Jerome Oudin},
url = {https://www.sciencedirect.com/science/article/pii/S0301679X97000194},
doi = {10.1016/S0301-679X(97)00019-4},
issn = {0301-679X},
year = {1997},
date = {1997-01-01},
journal = {Tribology International},
volume = {30},
number = {8},
pages = {561-570},
abstract = {To analyse accurately the performances of some manganese phosphate coatings, it is proposed to use a friction–seizure test procedure to evaluate the effective phosphate bonding and the lubricant effects. The coating seizure resistance is analysed mainly by considering different temperatures, concentration and dipping time values for the main steps of the whole phosphating process, i.e. degreasing, refining and phosphating. The measures, that are found to be easily reproducible and very sensitive to the treatment parameters, have allowed an easy and objective optimization of the manganese phosphating process. Metallurgical variables, which affect the seizure resistance of manganese phosphate coatings, are also studied by considering the influence of carbon content of a set of plain carbon steels.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
To analyse accurately the performances of some manganese phosphate coatings, it is proposed to use a friction–seizure test procedure to evaluate the effective phosphate bonding and the lubricant effects. The coating seizure resistance is analysed mainly by considering different temperatures, concentration and dipping time values for the main steps of the whole phosphating process, i.e. degreasing, refining and phosphating. The measures, that are found to be easily reproducible and very sensitive to the treatment parameters, have allowed an easy and objective optimization of the manganese phosphating process. Metallurgical variables, which affect the seizure resistance of manganese phosphate coatings, are also studied by considering the influence of carbon content of a set of plain carbon steels. |
1992Article de journal ER2 Auteurs : Hivart, Philippe; Bricout, Jean-Paul; Oudin, Jerome New real-time test for prediction of zinc phosphate/stearate coating breakdown: optimal stearate settling parameters for steel billets in cold forging Dans: Tribology International, vol. 25, no. 1, p. 45-51, 1992, ISSN: 0301-679X, (ACL). Résumé | Liens @article{HIVART199245,
title = {New real-time test for prediction of zinc phosphate/stearate coating breakdown: optimal stearate settling parameters for steel billets in cold forging},
author = {Philippe Hivart and Jean-Paul Bricout and Jerome Oudin},
url = {https://www.sciencedirect.com/science/article/pii/0301679X9290120C},
doi = {10.1016/0301-679X(92)90120-C},
issn = {0301-679X},
year = {1992},
date = {1992-01-01},
journal = {Tribology International},
volume = {25},
number = {1},
pages = {45-51},
abstract = {The test discussed here quickly reproduces interface pick-up occurrence and degradation of phosphate coatings wich have been dipped in stearate solutions. It involves a rotating cylindrical specimen directly cropped from bar stock of forging plants and phosphate/stearate processed. A constant load is applied on the specimen coating by means of a profiled indenter. Tangential friction force values are measured throughout the rotation time. The stearate settling parameters are analysed in terms of pick-up sensitivity. It is shown that low friction stress and phosphate/stearate coating reliability are mainly due to zinc stearate formation and stearate settling conditions. Secure rules for stearate settling are proposed from the described reference experimental data. The test is found to be a good support for real-time management of phosphate/stearate baths.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
The test discussed here quickly reproduces interface pick-up occurrence and degradation of phosphate coatings wich have been dipped in stearate solutions. It involves a rotating cylindrical specimen directly cropped from bar stock of forging plants and phosphate/stearate processed. A constant load is applied on the specimen coating by means of a profiled indenter. Tangential friction force values are measured throughout the rotation time. The stearate settling parameters are analysed in terms of pick-up sensitivity. It is shown that low friction stress and phosphate/stearate coating reliability are mainly due to zinc stearate formation and stearate settling conditions. Secure rules for stearate settling are proposed from the described reference experimental data. The test is found to be a good support for real-time management of phosphate/stearate baths. |
1990Article de journal ER2 Auteurs : Bricout, Jean-Paul; Hivart, Philippe; Oudin, Jerome; Ravalard, Yves New testing procedure of zinc phosphate coatings involved in cold forging of cylindrical steel billets Dans: Journal of Materials Processing Technology, vol. 24, p. 3-12, 1990, ISSN: 0924-0136, (ACL). Résumé | Liens @article{BRICOUT19903,
title = {New testing procedure of zinc phosphate coatings involved in cold forging of cylindrical steel billets},
author = {Jean-Paul Bricout and Philippe Hivart and Jerome Oudin and Yves Ravalard},
url = {https://www.sciencedirect.com/science/article/pii/092401369090163O},
doi = {10.1016/0924-0136(90)90163-O},
issn = {0924-0136},
year = {1990},
date = {1990-01-01},
journal = {Journal of Materials Processing Technology},
volume = {24},
pages = {3-12},
abstract = {Cylindrical cropped billets are often used in the cold forging plants at the beginning of processes and the same cylindrical billets are involved as test specimens in the proposed procedure. On the experimental device, the specimens rotate whilst a semi-cylindrical indenter exerts a constant normal load on it. Tangential force values are measured all along the rotation time. Test adjustable parameters are the normal load exerted, specimen rotation speed and indented radius of curvature. The optimum values of the test parameters are defined in considering the pickup occurrence. Then, the influence of treatments parameters which correspond to different phosphate coatings and lubrication states are analyzed in terms of friction tangential force versus sliding velocities and sliding displacements. The influence of three treatments parameters, acid pickling, phosphating bath and lubricants are enhanced by using the testing procedure for typical 1020 and 4142 carbon steel specimens. Significant tangenital friction force versus sliding length curves are obtained. The proposed test and procedure are able to determine critical friction curves and allow the secure management of both coating treatments and cold forging sequences.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
Cylindrical cropped billets are often used in the cold forging plants at the beginning of processes and the same cylindrical billets are involved as test specimens in the proposed procedure. On the experimental device, the specimens rotate whilst a semi-cylindrical indenter exerts a constant normal load on it. Tangential force values are measured all along the rotation time. Test adjustable parameters are the normal load exerted, specimen rotation speed and indented radius of curvature. The optimum values of the test parameters are defined in considering the pickup occurrence. Then, the influence of treatments parameters which correspond to different phosphate coatings and lubrication states are analyzed in terms of friction tangential force versus sliding velocities and sliding displacements. The influence of three treatments parameters, acid pickling, phosphating bath and lubricants are enhanced by using the testing procedure for typical 1020 and 4142 carbon steel specimens. Significant tangenital friction force versus sliding length curves are obtained. The proposed test and procedure are able to determine critical friction curves and allow the secure management of both coating treatments and cold forging sequences. |