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通过红外热学对高强度钢的疲劳限值评估
Yingxin Zhao1, Zhaodong Lin2, Yu Xia2
1Standards & Metrology Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100010, China.
Materials (Basel, Switzerland)
|January 25, 2025
概括
红外热学可以评估金属的疲劳极限. 这项研究完善了具有有限温度变化的高强度钢 (SAE52100) 的技术,通过疲劳内在消散分析提高了精度.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 非破坏性测试 不破坏性测试
背景情况:
- 红外热学 (IRT) 是有效的疲劳极限评估在金属显著的温度变化.
- 然而,它的准确性对于在疲劳负荷时呈现极小热变化的材料是有限的.
- 由于SAE52100钢在疲劳时能耗较低,因此具有挑战性.
研究的目的:
- 通过传统方法和IRT,评估SAE52100钢的疲劳性能.
- 对具有低温度变化材料的IRT的适用性进行评估和改进.
- 为了比较基于最大温度升高与疲劳内在消散的疲劳极限预测.
主要方法:
- 传统的SAE52100钢的疲劳实验在80Hz,R=-1,最多为10^7周期.
- 逐步增加应力振幅负载与IRT用于温度监测.
- 模拟有限元法 (FEM) 模拟以验证实验温度变化.
主要成果:
- 传统的疲劳测试确定了SAE52100钢的疲劳极限约为800 MPa.
- 在IRT检测到的最大温度升高仅为~1°C.
- 疲劳极限预测有所不同:841,772,787 MPa (最大温度增加) 与793,791,789 MPa (内在消散) 相比.
结论:
- 疲劳内在消散提供了一个更准确的方法来预测疲劳极限,在低消散材料中使用IRT.
- IRT可以应用于能量消耗较低的材料,但需要精细分析.
- 这项研究验证了IRT用于在具有挑战性的金属材料中评估疲劳.
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