Uncertainty Analysis of Dynamic Rupture Measurements Obtained Through Ultrahigh-Speed Digital Image Correlation
Uncertainty Analysis of Dynamic Rupture Measurements Obtained Through Ultrahigh-Speed Digital Image Correlation
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DOI：
10.1007/s11340-022-00932-9
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发表时间：
2023-01
影响因子：
2.4
通讯作者：
A. Lattanzi;V. Rubino;M. Rossi;A. Donzelli;A. Rosakis;N. Lapusta
中科院分区：
文献类型：
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作者：
A. Lattanzi;V. Rubino;M. Rossi;A. Donzelli;A. Rosakis;N. Lapusta
背景动态剪切裂纹的全场行为，其高度瞬态的特点，最近被量化采用数字图像相关（DIC）加上超高速摄影（在1-2万帧/秒）。超高速DIC的使用使得能够在受控的实验室条件下观察与动态剪切断裂演化相关的复杂结构，并详细描述其独特的全场运动学特征。这使得识别，例如，亚瑞利和intersonic剪切破裂的时空特性，并测量动态摩擦的演变过程中破裂传播的摩擦剪切rupture. Exclusive捕捉这种高度瞬态现象是一个具有挑战性的exclusive过程的影响，超快成像程序和DIC分析参数。然而，这些参数对破裂特征的量化的影响尚未得到评估。在这里，提出了一个模拟实验框架，并采用超高速DIC measurements.MethodsFinite element模拟复制动态破裂自发传播沿着摩擦界面的实验室实验的不确定性进行评估。用超高速摄像机采集的试样的实验图像进行数值变形的位移场从数值模拟和分析使用相同的DIC分析程序在实验室experiments.ResultsThe位移，粒子速度，和应变场从DIC分析获得的地面实况场的数值模拟进行比较，将测量分辨率与传播的模式II破裂的物理长度尺度相关联。此外，全场数据估计的能力的超高速DIC设置推断的动态摩擦evolutions.ConclusionsThis方法使我们能够量化的准确性的超高速DIC测量在解决复杂的时空结构的动态剪切破裂，专注于关键的相关参数的影响。
BackgroundThe full-field behavior of dynamic shear cracks, with their highly transient features, has recently been quantified by employing Digital Image Correlation (DIC) coupled with ultrahigh-speed photography (at 1-2 million frames/sec). The use of ultrahigh-speed DIC has enabled the observation of complex structures associated with the evolution of the dynamic shear fractures under controlled laboratory conditions, providing a detailed description of their distinctive full-field kinematic features. This has allowed to identify, for instance, the spatiotemporal characteristics of sub-Rayleigh and intersonic shear ruptures, and to measure the evolution of dynamic friction during rupture propagation of frictional shear ruptures.ObjectiveCapturing such highly transient phenomena represents a challenging metrological process influenced by both ultra-fast imaging procedures and DIC analysis parameters. However, the effect of these parameters on the quantification of the rupture features has not been assessed yet. Here, a simulated experiment framework is presented and employed to evaluate the uncertainties associated with ultrahigh-speed DIC measurements.MethodsFinite element simulations replicate laboratory experiments of dynamic ruptures spontaneously propagating along frictional interfaces. Experimental images of the specimen acquired with an ultrahigh-speed camera are numerically deformed by the displacement fields obtained from the numerical simulations and are analyzed using the same DIC analysis procedure as in the laboratory experiments.ResultsThe displacement, particle velocity, and strain fields obtained from the DIC analysis are compared with the ground-truth fields of the numerical simulations, correlating the measurement resolution with the physical length scale of the propagating Mode II rupture. In addition, the full-field data are employed to estimate the capability of the ultrahigh-speed DIC setup to infer the dynamic friction evolution.ConclusionsThis methodology allows us to quantify the accuracy of the ultrahigh-speed DIC measurements in resolving the complex spatiotemporal structures of dynamic shear ruptures, focusing on the impact of the key correlation parameters.