Ping LI
,
Kemin XUE
,
Yan LU
,
Jianrong TAN
材料科学技术（英文）
Ti-15-3 alloy is a new metastable β- type titanium. The influence of hot deformation parameters on the microstructure of Ti-15-3 alloy after solution treatment has been studied by isothermal compression tests as well as quantitative metallographic analysis. On the basis of the data obtained from the tests, predicting models for equivalent grain size and recrystallization volume fraction have been established with an artificial neural network method. An FE numerical simulation system has been developed to simulate the distribution of microstructure in Ti-15-3 alloy after hot back extrusion and solution treatment by combining the neural network model with thermal-mechanical coupled rigid-viscoplastic FE model. Corresponding experimental research is performed. The agreement of the simulated results with measured ones shows that the simulation system is reliable.
关键词:
Ti-15-3 alloy
,
null
,
null
,
null
苏维国
,
穆志韬
,
刘涛
,
马晓乐
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2014.02.005
金属韧性断裂是损伤累积的结果,以孔洞演化理论和细现损伤力学模型为基础,将韧性断裂机制分为拉伸型和剪切型两种类型,提出了一个适用于不同变形路径的统一形式的韧性断裂准则.通过编写用户材料子程序VUMAT,将韧性断裂准则嵌入到ABAQUS有限元软件的准静态算法主程序中,模拟了航空铝合金LY12CZ(Kt=1和3)单向拉伸时材料损伤累积、裂纹萌生、扩展直至韧性断裂的物理全过程,并通过拉伸试验验证了模型的有效性.韧性金属材料孔洞断裂机制研究表明,单调加载过程中宏观裂纹的形成是孔洞在夹杂物和第二相微粒周围形核、长大直至聚合的结果.
关键词:
韧性金属材料
,
断裂
,
损伤累积
,
有限元分析
