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改进模拟模型准确性,用于AA 2219的摩擦接
Kennen Brooks1, Bryan Ramos1, David J Prymak1
1Department of Manufacturing Engineering, Brigham Young University, Provo, UT 84602, USA.
Materials (Basel, Switzerland)
|March 13, 2025
概括
精确的摩擦接 (FSW) 建模需要高张变速流应力数据. 使用高压剪切试验的数据和诺顿粘性塑料摩擦定律显著降低了FE模型误差65%.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 计算建模 计算建模
背景情况:
- 摩擦接 (FSW) 由于极端应变速率和温度梯度而带来建模挑战.
- 传统的宪法法规校准使用低应变率数据,不代表FSW区条件.
研究的目的:
- 为AA 2219-T67.7.开发一个更准确的有限元 (FE) FSW模拟.
- 调查高延展率流量应力数据和摩擦规律对FE模型预测的影响.
主要方法:
- 采用了一种新的方法来测量高拉伸率和高温度下的流应力.
- 利用这些数据来开发FSW的FE模拟.
- 评估了不同的摩擦定律,包括诺顿粘性塑料定律和特雷斯卡限制的库伦定律.
主要成果:
- 诺顿粘性塑料摩擦定律产生了最准确的FE模型预测.
- 与传统校准方法相比,精确的流量应力和优化的摩擦参数将模型的整体误差降低了65%.
- 诺顿定律的成功归因于它捕捉温度和速率灵敏度的能力.
结论:
- 高压剪切测试为准确的FSW构成模型提供了关键数据.
- 诺顿粘性塑料摩擦定律在FSW模拟中优越,因为它考虑了材料速率和温度灵敏度.
- 改进的建模提高了FSW过程结果的理解和预测.
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