Refining constitutive relation by integration of finite element simulations and Gleeble experiments

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（6）
• 页码范围: 1039-1043
• 页数: 5页
• 语种: 英文

摘要

Thermo-mechanical coupled finite element calculations were carried out to simulate the Gleeble compression of the samples of a titanium alloy (Ti60),and the results are analyzed and compared with the actual compression tests conducted on a Gleeble 3800 thermo-mechanical simulator.The changes in temperature,stress and strain distribution in the samples and the source of error on the constitutive relations from Gleeble hot compression test were analyzed in detail.Both simulations and experiments showed that the temperature distribution in the specimen is not uniform during hot compression,resulting in significant deformation inhomogeneity and non-ignorable error in the flow stress strain relation,invalidating the uniform strain assumption commonly assumed when extracting the constitutive relation from Gleeble tests.Based on the finite element simulations with iterative corrections,we propose a scheme to refine the constitutive relations from Gleeble tests.