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| DP600双相钢单向拉伸的交叉颈缩现象与有限元分析 |
| Cross-necking Phenomenon in Uniaxial Tensile Tests and Finite Element Analysis of DP600 Dual Phase Steel |
| Received:March 27, 2017 Revised:May 10, 2017 |
| DOI：10.3969/j.issn.1674-6457.2017.03.015 |
| 中文关键词: 单向拉伸 交叉颈缩 有限元模拟 |
| 英文关键词: uniaxial tension cross-necking finite element simulation |
| 基金项目:国家自然科学基金（51175044） |
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| 中文摘要: |
| 目的 探究DP600双相钢单向拉伸时交叉颈缩现象的产生原因。方法 在单轴拉伸实验的基础上，利用ABAQUS有限元软件对拉伸过程进行模拟，对交叉颈缩区域进行应力、应变分析。结果 即将发生断裂时刻，试样标距内中心位置应力达到最大值，临近中心位置两侧由于“局部卸载”而出现应力大幅减小的情况。结论 试样标距内两侧距离中心越远的位置，越接近于单轴应力状态。DP600板材裂纹萌生时，与断裂发生部位越接近，其应力状态与平面应变状态越相似，沿着颈缩线方向基本没有应变产生，材料主要由颈缩线区域的板材厚向减薄颈缩线加宽补偿垂直于颈缩线方向上的拉伸。 |
| 英文摘要: |
| The paper aims to study cross-necking phenomenon in uniaxial tensile tests and its causes. Based on uniaxial tensile tests, stress and strain of the cross-necking region were analyzed by simulating stretching process with finite element analysis software ABAQUS. Stress at the center of specimen was the maximum just before fracture occurred, and stress near two sides of the center decreased greatly due to “partial unloading”. The stress is close to uniaxial stress as it is far away from both sides in gauge distance. It is closer to the fracture site when cracks are initiated on DP600 panels, and the stress state is more similar to plane strain state. There is little strain along the necking line. The material in panel thickness and along the necking line flows to the direction perpendicular to the necking line. |
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