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Characterization of cavitation development while tensile testing PVF2 using 3D X-ray microtomography

机译：使用3D X射线显微断层照相术对PVF2进行拉伸测试时的空化发展特征

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Fast X-ray microtomography, coupled with a specially designed tensile cell, has been used to investigate in situ spatio-temporal development of cavitation in PVF2. Experiments have been performed during a monotonic loading up to fracture. The influence of the root stress triaxiality and of the loading rate conditions have also been investigated through non-monotonic tensile tests including load reversal and relaxation sequences.The analysis of the monotonic tests has revealed two types of cavitation: (subvoxel) diffuse cavitation and (resolved) macro-cavitation. The presence of particles in the high stress triaxiality areas of the material have been reported as potential initiation site of macro-cavities. Macro-cavity growth is shown to be responsible for the fracture of the high root stress triaxiality specimen. In the low root stress triaxiality specimen, both macro-cavity growth and microstructural reorganization are involved in the fracture mechanisms.The non-monotonic tests have revealed the viscoplastic feature of diffuse cavitation. Porosity can be divided into a reversible component and a residual component. The residual porosity value is not affected by the loading rate conditions and only depends on the root stress triaxiality ratio. The higher the root stress triaxiality, the higher the residual porosity.This study forms a complete experimental data set that can be used to improve the predictability of the mechanical models in terms of alteration distribution, and help in understanding the fracture mechanisms to define relevant fracture criteria for the polymer materials under service conditions.
机译：快速X射线显微断层照相术结合专门设计的拉伸池已用于研究PVF2中空化的原位时空发展。在单调加载直至断裂的过程中进行了实验。还通过非单调拉伸测试（包括载荷反转和松弛序列）研究了根应力三轴性和加载速率条件的影响。对单调测试的分析揭示了两种类型的空化:(亚体素）弥散空化和（解决）宏观空化。据报道，在材料的高应力三轴性区域中存在颗粒是大腔体的潜在起始位点。大孔洞的生长被证明是高根应力三轴性试样断裂的原因。在低根应力三轴性试样中，断裂机理涉及大孔洞的生长和微观结构的重组。非单调试验揭示了弥散空化的粘塑性特征。孔隙度可分为可逆成分和残留成分。残余孔隙率值不受加载速率条件的影响，仅取决于根应力三轴比。根应力三轴性越高，残​​余孔隙度越高。本研究形成了一个完整的实验数据集，可用于提高蚀变分布方面的力学模型的可预测性，并有助于理解定义相关裂缝的断裂机理使用条件下聚合物材料的标准。

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