航空材料学报2018，Vol.38Issue(1)：80-87,8.DOI:10.11868/j.issn.1005-5053.2017.000070
高Nb-TiAl合金高温力学行为本构建模仿真技术
High Temperature Mechanical Constitutive Modeling of a High-Nb TiAl Alloy
摘要
Abstract
Uniaxial tensile,low cycle fatigue,fatigue-creep interaction and creep experiments of a novel high-Nb TiAl alloy (i. e. Ti-45Al-8Nb-0. 2W-0. 2B-0. 02Y (atom fraction/％))were conducted at 750 ℃ to obtain its tested data and curves. Based on Chaboche visco-plasticity unified constitutive model,Ohno-Wang modified non-linear kinematic hardening was introduced in Chaboche constitu-tive model to describe the cyclic hardening/softening,and Kachanov damage was coupled in Chaboche constitutive model to character-ize the accelerated creep stage. The differential equations of the constitutive model discretized by explicit Euler method were compiled in to ABAQUS/UMAT to simulate the mechanical behavior of high-Nb TiAl alloy at different test conditions. The results show that Chaboche visco-plasticity unified constitutive model considering both Ohno-Wang modified non-linear kinematic hardening and Kacha-nov damage is able to simulate the uniaxial tensile,low cycle fatigue,fatigue-creep interaction and creep behavior of high-Nb TiAl alloy and has high accuracy.关键词
高Nb-TiAl合金/低周疲劳/疲劳-蠕变交互/蠕变/本构模型Key words
high-Nb TiAl alloy/low cycle fatigue (LCF)/fatigue-creep interaction/creep/constitutive model分类
矿业与冶金引用本文复制引用
董成利,于慧臣,焦泽辉,孔凡涛,陈玉勇..高Nb-TiAl合金高温力学行为本构建模仿真技术[J].航空材料学报,2018,38(1):80-87,8.基金项目
国家自然科学基金-青年基金项目(51401195 ) （51401195 ）
国家重点基础研究发展计划(973计划)(2011CB605501) （973计划）
航空基金项目(2013ZF21014) （2013ZF21014）
