Most stress/strain analysis problems are three-dimensional (3D) in nature. Yet there is scarcely any practical experimental technique that can be employed to tackle the problem with accuracy. The earliest attempts see the development of frozen stress photoelasticity and scattered light photoelasticity. But the need to use a transparent birefringent material to model the real problem severely restricts their applicability. And the complicated procedures render these techniques evenless attractive. Recently, we (Mao and Chiang) developed a 3D stress/strain analysis technique which has the potential to revolutionize the field. We take advantage of true 3D imaging technique such as CT (Computer Tomography) and MRI (Magnetic Resonance Imaging) to record a volumetric image of an object. We extended the 2D digital speckle photography technique developed by Chiang et al. to 3D such that it can be applied to stress/strain analysis of any non-transparent materials. This paper presents the first application of this technique to analyzing the deformation of red sandstone rocks.
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机译：本质上，大多数应力/应变分析问题都是三维（3D）问题。然而，几乎没有任何实际的实验技术可以用来精确地解决该问题。最早的尝试是看到冻结应力光弹性和散射光光弹性的发展。但是，需要使用透明的双折射材料来模拟实际问题严重限制了它们的适用性。复杂的过程使这些技术变得毫无吸引力。最近，我们（毛和蒋）（Mao and Chiang）开发了一种3D应力/应变分析技术，该技术可能会改变该领域。我们利用真正的3D成像技术（例如CT（计算机断层扫描）和MRI（磁共振成像））来记录物体的体积图像。我们扩展了Chiang等人开发的2D数字散斑摄影技术。到3D，以便可以将其应用于任何非透明材料的应力/应变分析。本文介绍了该技术在分析红砂岩岩石变形中的首次应用。
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