|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Algorithm Development in Materials Science and Engineering
||Modeling Yield Point Phenomenon Using a Modified Mechanical Threshold Stress Model
||Jason Allen, Hamid Garmestani
|On-Site Speaker (Planned)
Limited modeling capabilities have been developed to model upper and lower yield points (yield point phenomenon) in bcc materials and the description of their mechanical behavior due to dynamic processes depends greatly on a constitutive model being able to account accurately for flow stress evolution under various strain-rates and temperatures. The Mechanical Threshold Stress (MTS) model has shown to model this behavior quite well, though it has previously been unable to model yield point phenomenon. In this work, a previously calibrated MTS model for the Ta-10W alloy undergoing high strain-rate compression is examined and modification of the work-hardening rate coefficient in the modified Voce hardening law is introduced to model the yield point phenomenon. This empirical modification relies on a variable work-hardening rate coefficient as a function of strain that captures a more realistic evolution of the rate of hardening. Generalization to include strain-rate and temperature is also discussed.
||Planned: Supplemental Proceedings volume