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Anisotropic Damage-coupled Sheet Metal Forming Limit Analysis

机译:各向异性损伤耦合钣金成形极限分析

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摘要

This article presents a review of the sheet metal formability analysis based on the theory of damage mechanics. Specifically, the damage anisotropy is considered. Forming limit analyses based on the anisotropic damage are summarized, including the accumulative critical damage method, the damage-coupled vertex theory and the damage-coupled acoustic tensor method. The accumulative critical damage method postulates that the critical damage at the localized necking is strain-path or loading history independent. It can be applied to predict the forming limit diagrams under either proportional or nonproportional loading. The vertex theory considers that localized necking is associated with the vertex developed on yield surface. The theory is applicable to engineering materials exhibiting the strain-hardening and/or strain-rate dependent behaviors. The acoustic tensor method, on the other hand, can only be applied to the strain-softening materials, which are often observed in warm/hot sheet metal forming or hydroforming.
机译:本文介绍了基于损伤力学理论的钣金成形性分析。具体而言,考虑了损伤各向异性。总结了基于各向异性损伤的成形极限分析,包括累积临界损伤方法,损伤耦合顶点理论和损伤耦合声张量方法。累积临界损伤方法假定局部颈缩处的临界损伤与应变路径或加载历史无关。它可用于预测在比例或非比例载荷下的成形极限图。顶点理论认为局部颈缩与屈服面上形成的顶点有关。该理论适用于表现出应变硬化和/或应变速率相关行为的工程材料。另一方面,声张量法只能应用于应变软化材料,这种材料通常在热/热金属板成形或液压成形中观察到。

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