High strain rate sensitivity of ultra-high molecular weight polyethylene and its consequence on cold-spray deposition behavior

Kesavan Ravi, Kazuhiro Ogawa, Tiana Deplancke, Olivier Lame, Jean Yves Cavaillé

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The cold spray deposition mechanism of Ultra-High Molecular Weight Polyethylene (UHMWPE) requires a detailed understanding of strain rate sensitivity of UHMWPE. The yield and flow in UHMWPE are complex and sophisticated compared to metals due to their dependency on time, temperature, strain, strain-rate and the history of the processing. In this research work, powder-sintered UHMWPE of 10.5 Mg/mol was subjected to various strain-rates ranging from 10-2 s-1 to 103 s-1 via low compression strain-rate testing and Split Hopkinson Pressure Bar testing (SHPB). The experimental true stress-strain curves in compression of a sintered UHMWPE at pre-yield, yield point, and post-yield were analyzed. The pre-yield and yield point region, 10.5 Mg/mol UHMWPE exhibited an increase in the tangent modulus and the yield stress with an increase in strain rate. Further, the post-yield phenomenon in UHMWPE shows no apparent post-yield softening and shows an increase in the strain hardening with an increase in the strain-rate. The curves at increasingly higher strain rates showed an increasingly pronounced bi-linearity to its flow behavior with the rate of hardening increasing above 10-15% strain. Under the domain tested, the strain rate dependence for UHMWPE can be depicted by a logarithmic fit.

Original languageEnglish
Title of host publicationASM International - International Thermal Spray Conference, ITSC 2018
EditorsFardad Azarmi, Timothy Eden, Hua Li, Filofteia-Laura Toma, Kantesh Balani, Tanvir Hussain, Kentaro Shinoda
PublisherASM International
Pages371-374
Number of pages4
ISBN (Electronic)9781510880405
Publication statusPublished - 2018 Jan 1
EventInternational Thermal Spray Conference, ITSC 2018 - Orlando, United States
Duration: 2018 May 72018 May 10

Publication series

NameProceedings of the International Thermal Spray Conference
Volume2018-May

Conference

ConferenceInternational Thermal Spray Conference, ITSC 2018
CountryUnited States
CityOrlando
Period18/5/718/5/10

ASJC Scopus subject areas

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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