一个修改的DF2016标准,用于从剪切到等轴张力的断裂建模
Xiaona Xu1, Ruqiang Yan1, Xucheng Fang1
1School of Mechanical Engineering, Xi'an Jiao Tong University, 28 Xianning West Road, Xi'an 710049, China.
Materials (Basel, Switzerland)
|February 24, 2024
概括
一个经过修改的DF2016标准准确地模拟了板金属在各种应力状态中的柔性断裂. 这种增强的模型简化了校准,提高了断裂预测精度,从剪切到等轴张力.
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:
- 柔性断裂建模对于预测金属板材料故障至关重要.
- 像DF2016这样的现有标准需要复杂的校准,可能不涵盖所有应力状态.
- 准确的断裂预测对于优化结构设计和材料使用至关重要.
研究的目的:
- 引入一个修改的DF2016标准,用于板金属的柔性断裂建模.
- 为了简化校准过程,将材料常数与易于测量的等轴张力断裂应变联系起来.
- 为了验证修改后的标准在各种压力状态的性能,从剪切到等轴张力.
主要方法:
- 修改了DF2016柔性骨折标准的修改.
- 使用五种样品类型对QP980钢进行实验测试,模拟从剪切到等轴张力的应力状态.
- 使用Swift-Voce硬化定律和pDrucker函数对材料塑性进行表征,通过逆向工程校准.
- 使用XTOP数字图像相关系系统测量断裂应变.
- 使用逆向工程校准修改后的DF2016标准.
- 预测的强力冲击曲线与实验数据的比较.
主要成果:
- 修改后的DF2016标准准确地预测了QP980钢的柔性断裂的发生.
- 在广泛的应力状态中实现了高精度,包括剪切,平面应力张力和等轴应力.
- 修改后的标准表明,与原来的DF2016标准相比,校准的方便性更高.
- 实验力-冲击曲线与修改后的标准的预测非常相匹配.
结论:
- 修改后的DF2016标准提供了一种强大且易于使用的方法,用于板金属的柔性断裂建模.
- 简化校准方法提高了工程设计中的实际应用性.
- 该研究验证了该标准在不同负载条件下预测断裂行为的有效性.
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