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A Digital Image Correlation Method For Fatigue Test Experiments

机译:疲劳测试实验的数字图像相关方法

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摘要

In this paper, a method based on the digital image correlation (DIC) technique is proposed to monitor the crack growth process during a cyclic fatigue test. Stroboscopic illumination is used to acquire DIC speckle pattern images while the test sample is dynamically loaded. The proposed DIC algorithm uses the fact that the load is periodic to increase the accuracy of the displacement field estimates (a sinusoidal fitting method is introduced for this purpose). Using the appropriate post-processing both the crack lengths and the stress intensity factors can be estimated in function of the number of fatigue cycles. A validation test case on an aluminum U-profile will be presented in the paper.
机译:本文提出了一种基于数字图像相关技术(DIC)的方法来监测循环疲劳试验过程中的裂纹扩展过程。在动态加载测试样品时,频闪照明用于获取DIC斑点图像。提出的DIC算法利用负荷是周期性的这一事实来提高位移场估计的准确性(为此目的引入了正弦拟合方法)。使用适当的后处理,可以根据疲劳循环数估算裂纹长度和应力强度因子。本文将介绍铝制U型材的验证测试案例。

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