Finite-element method simulation of effects of microstructure, stress state, and interface strength on flow localization and constraint development in Nb/Cr2Nb in situ composites
Finite-element method simulation of effects of microstructure, stress state, and interface strength on flow localization and constraint development in Nb/Cr2Nb in situ composites
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DOI：
10.1007/s11661-999-0234-2
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发表时间：
1999-12
期刊：
影响因子：
--
通讯作者：
G. Lin;K. Chan
中科院分区：
文献类型：
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作者：
G. Lin;K. Chan
采用有限元法研究了Nb/Cr2 Nbin原位复合材料中颗粒体积分数、应力状态和界面强度对屈服强度、流动局部化、塑性约束和损伤发展的影响。原位复合材料的微观结构表示为包含嵌入在固溶体合金基体中的Cr2 Nb颗粒的单元矩形或方形晶胞。硬颗粒被认为是弹性和各向同性的，而基体是弹塑性的，服从Ramberg-Osgood本构关系。有限元模型被用来计算复合材料的强度，局部静水应力，和塑性应变分布的颗粒的体积分数，应力状态，和界面强度的函数。研究结果表明，颗粒的体积断裂、应力状态和界面性质对Nb/Cr2 Nb复合材料的塑性约束和损伤发展有重要影响。
The effects of volume fraction of particles, stress state, and interface strength on the yield strength, flow localization, plastic constraint, and damage development in Nb/Cr2Nbin situcomposites were investigated by the finite-element method (FEM). The microstructure of thein situcomposite was represented in terms of a unit rectangular or square cell containing Cr2Nb particles embedded within a solid-solution-alloy matrix. The hard particles were considered to be elastic and isotropic, while the matrix was elastic-plastic, obeying the Ramberg-Osgood constitutive relation. The FEM model was utilized to compute the composite strength, local hydrostatic stress, and plastic strain distributions as functions of volume fraction of particles, stress state, and interface strength. The results were used to elucidate the influence of volume fracture of particles, stress state, and interface property on the development of plastic constraint and damage in Nb/Cr2Nb composites.