A Speckling Technique for DIC on Ultra-Soft, Highly Hydrated Materials
A Speckling Technique for DIC on Ultra-Soft, Highly Hydrated Materials
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DOI：
10.1007/s11340-023-00938-x
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发表时间：
2023-01
影响因子：
2.4
通讯作者：
G. Sugerman;J. Yang;M. K. Rausch
中科院分区：
文献类型：
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作者：
G. Sugerman;J. Yang;M. K. Rausch
在许多工程学科中，数字图像相关是测量和可视化变形场的有用工具。值得注意的是，它的成功应用非常依赖于高质量的表面散斑图案。虽然有许多标准技术可以应用这些图案，但有些材料由于其独特的表面特性而需要特殊的技术。我们的技术简介的目标是介绍一种斑点技术，用于超软和高度水合材料，标准斑点技术可能不适合。我们选择血凝块作为我们的主要样品材料。方法聚合物颗粒是一种简便、快速、廉价的斑点材料。为了测试其有效性和适用性，我们将黑色和白色颗粒以50:50的比例混合制成血凝块。接下来，我们进行了纯剪切和i型断裂实验，以确定这些颗粒是否产生高质量的DIC图案，以及它们的应用是否改变了材料的行为。结果我们发现，通过平均图像梯度和数字图像相关模拟器评估，应用50:50的黑白颗粒混合产生高质量的斑点图案。此外，我们发现，通过测量材料的刚度、强度、加工断裂和断裂韧性，将颗粒应用于样品表面不会改变其材料特性。我们证实，我们的技术也适用于其他超软和高度水合的材料，将其应用于明胶。总之，我们提供了一种简单、快速、廉价的斑点技术，用于超软、高水合材料，如血凝块和明胶，且不改变材料的机械性能。
BackgroundDigital image correlation is a useful tool in many engineering disciplines to measure and visualize deformation fields. Noteworthily, its successful application is critically dependent on a high-quality surface speckle pattern. While there are numerous standard techniques to apply such patterns, some materials require special techniques because of their unique surface properties.ObjectiveThe goal of our technical brief is to introduce a speckling technique for ultra-soft and highly hydrated materials for which standard speckling techniques may not be suitable. We chose blood clot as our primary sample material.MethodsWe identified polymer granules as an easy, fast, and inexpensive speckling material. To test its efficacy and applicability, we patterned blood clot with a 50:50 mix of black and white granules. Next, we conducted pure shear and mode-I fracture experiments to determine whether these granules produce a high-quality DIC pattern and whether their application alters the material’s behavior.ResultsWe found that applying a 50:50 mix of black and white granules produced high-quality speckle patterns as evaluated via the mean image gradient and a digital image correlation simulator. Additionally, we found that applying granules to the samples’ surfaces does not alter their material properties as measured via the material’s stiffness, strength, work-to-fracture, and fracture toughness. We confirmed that our technique also works for other ultra-soft and highly hydrated materials by applying it to gelatin.ConclusionIn conclusion, we provide an easy, fast, and inexpensive speckling technique for ultra-soft, highly hydrated materials, such as blood clot and gelatin, which does not alter the materials’ mechanical properties.