锻压技术

GTN细观损伤模型参数对板料损伤行为的影响

英文标题：Influence of GTN meso\|damage model parameters on sheet forming

作者：陈志英董湘怀

分类号：TG386.3

出版年,卷(期):页码：2012,37(3):23-27

摘要：

基于Gurson\|Tvergaard-Needleman (GTN)细观损伤模型，借助ABAQUS软件，以方盒件拉深成形为例，应用正交试验设计方法分析了GTN模型各损伤参数的变化波动对AA5052-O铝合金板拉深成形后板厚减薄率和损伤程度的影响。结果表明：各损伤参数的波动变化对板厚减薄率的影响不大；而对最大孔洞体积分数的影响不可忽略，其中孔洞形核时的平均等效塑性应变εN对结果的影响最为显著；因孔洞体积分数与材料变形历史相关，可将其作为判断板料破裂的依据，尤其适用于断裂前缩颈现象不明显的材料。

Based on the Gurson-Tvergaard-Needleman (GTN) meso-damage model, by means of ABAQUS software, taking the drawing processes of a square box as an example, the effect of damage parameters variation on damage behavior was analyzed using orthogonal experimental design. The results show that the influence of damage parameter variation on sheet thickness reduction can be neglected, but can not be omitted for the porosity. And the mean plastic strain value at void nucleation εN has a distinct influence on the void volume fraction. Because the void volume fraction is related to the material forming history, it can be used as the criterion of predicting the sheet forming limit, especially suitable for the materials in which fracture occurs without any obvious necking phenomenon.

基金项目：

上海市教育委员会科研创新资助项目(12YZ183)；国家自然科学基金资助项目(50575143)；上海市教育委员会重点学科建设资助项目(J51902)

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