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| Q345 中厚板 V 形折弯应力 应变分析 |
| Stress and Strain Analysis of Q345 Plate V-Shaped Bending |
| Received:July 10, 2014 Revised:September 01, 2014 |
| DOI：10. 3969 /j. issn. 1674-6457. 2014. 05. 015 |
| 中文关键词: 中厚板 中性层 折弯 数值模拟 |
| 英文关键词: plate neutral layer bending numerical simulation |
| 基金项目: |
| Author Name | Affiliation | | LIU Yu-sheng | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China | | KONG Yan | Hubei Space Technology Academe Special Vehicle Technology Center, Wuhan 430040, China | | SONG Jian | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China | | MA Jun-lin | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China | | LI Ping | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
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| 中文摘要: |
| 目 的 研究 Q345 中厚板在 V 形折弯时的应力应变中 性层内 移规律。 方法 通过对中 厚板135o折弯过程进行数值模拟, 分析了 板料在成形过程中的等效应力应变及其中性层内 移现象, 测得了 应变中性层与 几何中间 层之间 的距离 变化。 在此基础上, 采用 厚度为 16 mm 的 Q345 板料进行物理实验, 并与 模拟结果进行了 对比分析。 结果 在成形过程中, 等效应力 应变中 性层均 产 生了内 移现象, 且应力中性层的内 移量明显大于应变中 性层的内 移量; 成形结束之后, 应变中 性层与 几何中间 层的距离 为 3. 3 mm; 实验结果显示, 应变中性层的内 移量为 3. 1 mm 左右, 与 模拟值较为 一致。 结论 数值模拟方法可以为应力应变中性层计算提供指导。 对于中 厚板折弯, 采用 几何中 间层展开求得的坯料尺寸并不准确。 |
| 英文摘要: |
| Objective To investigate the internal shift law of the stress and strain in neutral layer of Q345 plate Vshaped bending. Methods By simulating the 135o bending process of the plate, equivalent stress and equivalent strain as well as their internal shift phenomenon of the neutral layers were analyzed. Meanwhile, the distance between the strain neutral layer and the geometric neutral layer was measured. On this basis, the physical test was carried out using a Q345 sheet with a thickness of 16 mm, then the results were compared and analyzed with the simulation result. Results During the forming process, stress neutral layer as well as strain neutral layer both showed the internal shift phenomenon, and the displacement of the stress neutral layer was greater than that of the strain neutral layer. After forming, the distance between the strain neutral layer and the geometric middle layer was 3. 3 mm. The test result showed that the displacement of the strain neutral layer was about 3. 1 mm, which had a better agreement with the simulation result. Conclusion Numerical simulation could provide guidance for the calculation of the stress neutral layer and the strain neutral layer. For plate bending, the blank size obtained using expanded geometric middle layer was not accurate. |
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