Inertia Effects on the Ductile Failure of Thin Rings
Inertia Effects on the Ductile Failure of Thin Rings
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DOI：
10.1115/1.3162066
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发表时间：
1982-03
期刊：
影响因子：
--
通讯作者：
A. Rajendran;I. Fyfe
中科院分区：
文献类型：
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作者：
A. Rajendran;I. Fyfe
在薄环膨胀理论模型中引入惯性项表明，根据颈缩区局部应变定义的经典塑性失稳概念不再适用。通过引入孔洞增长在触发局部颈缩中的作用，通过最近提出的多孔塑料材料的本构方程，有可能克服这一困难。基于临界孔洞体积分数的判据提供了预测失效的替代方法。将该理论应用于薄环构型，得到的结果与由静态和动态加载的环获得的实验值吻合较好。还描述了为处理细环构型而开发的实验技术。
The introduction of inertia terms into a theoretical model of thin ring expansion shows that classical plastic instability concepts, defined in terms of the local strain in the necking region, no longer apply. By introducing the role of void growth in triggering local necking, through a recently proposed constitutive equation for porous plastic materials, it is possible to overcome this difficulty. A criterion based on a critical void volume fraction provides the alternative means to predict failure. This theory was applied to a thin ring configuration, and the results were found to compare favorably with experimental values obtained from statically and dynamically loaded rings. The experimental techniques developed to handle the thin ring configuration are also described.