在薄壁结构中通过一种新的损伤模型来预测柔性骨折
Sunghoon Choi1, Taehyun Park1, Heuisoo Kim1
1Department of Mechanical Engineering, Sogang University, Seoul, 04107, Republic of Korea.
Heliyon
|December 25, 2024
概括
这项研究提出了一种新的外元素损伤模型,显著改善了薄壁结构中的柔性骨折预测. 该模型在剪切应力下提高了50%的故障位移精度.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 计算力学 计算力学 计算力学
背景情况:
- 在薄壁结构中精确预测柔性骨折对于汽车,海洋和航空航天应用中的安全至关重要.
- 现有的损伤模型在预测跨多种应变局部化条件的断裂方面面临挑战,从双轴压缩到张力.
研究的目的:
- 开发和验证外元件的专用损伤模型,以提高柔性骨折预测的准确性.
- 为了改善在剪切应力下故障位移的预测,并在各种负载条件下调整断裂位点.
主要方法:
- 利用剪切,单轴和平面张力测试的实验数据来开发一个专门的外元素损伤模型.
- 从张力测试中使用的结与故障位移的比率,以调整3.0毫米外元件的断裂位置.
- 使用模拟的三点曲试验,将拟议模型的性能与沃尔特模型进行了比较.
主要成果:
- 与数字图像相关性相比,在剪切应力下的故障位移预测得到了50%的改进.
- 成功调整了外元件的断裂位置,覆盖了从双轴压缩到张力的范围.
- 在预测延展性骨折的发生,形状和力位移特征方面表现出更高的准确性.
结论:
- 与沃尔特斯模型等现有模型相比,提出的损伤模型在预测外元素中的柔性断裂方面提供了更高的准确性.
- 这一进步预计将在实际工程应用中显著提高柔性骨折预测的精度.
- 该模型能够处理各种应变局部化条件,这标志着结构完整性分析的重大进步.
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