| 闭挤式精冲变形区应力状态对断裂损伤的影响 |
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| 引用本文： | 邓明,王正立,吕琳. 闭挤式精冲变形区应力状态对断裂损伤的影响[J]. 塑性工程学报, 2011, 18(1). DOI: 10.3969/j.issn.1007-2012.2011.01.014 |
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| 作者姓名： | 邓明 王正立 吕琳 |
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| 作者单位： | 重庆理工大学,材料科学与工程学院,重庆,400054 |
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| 基金项目： | 重庆市科技攻关计划资助项目(CSTC2010AC3086) |
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| 摘 要： | 文章将考虑静水应力、最大主应力及应变历史对材料损伤影响的Brozzo断裂准则模型,用于闭挤式精冲的断裂预测。分析了变形区材料的应力、应变状态对材料断裂损伤的影响,并通过DEFORM-2D有限元软件的模拟及物理试验进行验证。研究表明,Brozzo断裂准则能比较精确地模拟闭挤式精冲过程,模拟结果与试验误差在6%以内;主、副凹模闭合时,变形区材料所受的压应力越大,越有利于抑制裂纹的产生和扩展;精冲过程中,凸模刃口附近材料的压应力大于主凹模刃口附近材料,裂纹首先出现在主凹模刃口处,材料开始产生裂纹时的有效应变,随压应力的增加而增大。
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| 关 键 词： | 精冲 韧性断裂 静水应力 精密成形 冲压 |
Influence of the stress state of deformation area on fracture damage during closed extruding fine-blanking |
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| DENG Ming,WANG Zheng-li,LV Lin. Influence of the stress state of deformation area on fracture damage during closed extruding fine-blanking[J]. Journal of Plasticity Engineering, 2011, 18(1). DOI: 10.3969/j.issn.1007-2012.2011.01.014 |
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| Authors: | DENG Ming WANG Zheng-li LV Lin |
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| Affiliation: | DENG Ming WANG Zheng-li LV Lin(Chongqing University of Technology,Materials Science & Engineering College,Chongqing 400054 China) |
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| Abstract: | The Brozzo Fracture Criterion model considering the influence of hydrostatic stress,maximum principle stress and strain history on material fracture was applied to predict the fracture of closed extruding fine-blanking.The influence of the stress and strain state of deforming area on material fracture damage was analyzed,and validated through simulation by DEFORM-2D finite element software and physical experiments.The research shows that Brozzo Fracture Criterion can simulate the closed extruding fine-blank... |
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| Keywords: | fine-blanking ductile fracture hydrostatic stress precision forming blanking |
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