研究确定材料的弹性-塑料构成参数从负载深度曲线基于纳米冲压技术的研究
Zhentao Li1, Yun Ye2, Guanjun Zhang1
1State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China.
Micromachines
|May 27, 2023
概括
这项研究介绍了一种最佳的反转策略,使用球形内来准确确定材料弹性-塑料参数,如.
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:
- 准确的弹性-塑料参数对于材料结构设计和工程评估至关重要.
- 仅从单个纳米缩曲线上确定这些特性是具有挑战性的.
- 现有的方法难以从缩数据中对材料性能进行反向估计.
研究的目的:
- 开发和验证一种新的最佳反转策略,用于确定弹性-塑性参数 (Young的模量,度强度,硬化指数) 使用球形缩.
- 探索这种策略在各种最大槽深度的可行性和准确性.
- 在Q355材料上实验验证拟议的方法.
主要方法:
- 建立一个高精度的有限元模型,用于球体内.
- 实验设计 (DOE) 的应用,以分析参数-缩响应关系.
- 数字模拟以评估在不同缩深度处反向估计的正确位置.
- 在Q355材料上使用循环负荷纳米印记的实验验证.
主要成果:
- 最优的反转策略产生了独特和高度准确的弹性-塑料参数,在测试深度中,误差在0.2%至1.5%之间.
- 有限元模型准确地预测了Q355材料的负载深度曲线.
- 来自该方法的优化应力-应变曲线与实验拉伸性测试有很好的一致性.
结论:
- 建议的最佳倒置策略有效地从球体痕数据中确定材料弹性-塑料参数.
- 该方法提供了准确可靠的结果,通过数值模拟和实验数据验证.
- 这种方法为工程应用中的材料表征提供了一个强大的替代方案.
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