The effects of rate sensitivity and plastic potential surface curvature on plastic flow localization in porous solids
The effects of rate sensitivity and plastic potential surface curvature on plastic flow localization in porous solids
复制标题
速率敏感性和塑性势表面曲率对多孔固体塑性流动局部化的影响
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
Jwo Pan
中科院分区：
文献类型：
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作者：
H. Jeong;Jwo Pan
分析了多孔弹粘塑性固体中塑性流动局部化问题，重点研究了材料速率敏感性和塑性势面曲率的影响。率敏感性的影响包括在材料模型，占率不敏感的多孔韧性固体的屈服面曲率的变化。利用本材料模型分析了平面应变和轴对称拉伸条件下剪切带的形成以及双向拉伸薄板的局部颈缩。结果表明，孔洞形核与长大、材料速率敏感性和塑性势面曲率对塑性流动局部化的影响是相互作用的。还证明了非比例应变路径对薄片局部颈缩的影响。
Plastic flow localization in porous elastic-viscoplastic solids is analyzed with an emphasis on the effects of material rate sensitivity and plastic potential surface curvature. The effect of rate sensitivity is included in a material model that accounts for a change of yield surface curvature in a rate-insensitive porous ductile solid. Shear band formation under plane strain and axisymmetric tension, and localized necking in biaxially stretched sheets are analyzed by using the present material model. The results illustrate the interactions of the effects of void nucleation and growth, material rate sensitivity and plastic potential surface curvature on plastic flow localization. The effects of nonproportional straining paths on localized necking in thin sheets are also demonstrated.