Abstract Deformation-induced cavitation influences the mechanical response of polymeric materials, but acquiring in situ measurements of the spatial evolution of cavities has typically necessitated the use of synchrotron radiation sources. The objective of this study is to develop and demonstrate a method allowing for in situ measurements of deformation-induced cavitation in axisymmetric polymer specimens, using a home-laboratory X-ray computed tomography setup. The method is demonstrated by assessing deformation-induced cavitation of mineral-filled PVC in a repeated loading-unloading experiment. A temporal resolution of about 3 s is obtained by exploiting the axisymmetry of notched round tensile specimens. The evolution of relative density was captured throughout the experiment, revealing an interplay between void nucleation and void growth. Combined with surface deformation measurements obtained by digital image correlation, the present technique yields data suitable for calibration and validation of material models.

中文翻译：

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热塑性塑料中变形诱导空化的原位 X 射线计算机断层扫描技术

摘要 变形引起的空化影响聚合物材料的机械响应，但获得空腔空间演化的原位测量通常需要使用同步辐射源。本研究的目的是开发和演示一种方法，允许使用家庭实验室 X 射线计算机断层扫描装置对轴对称聚合物试样中的变形诱导空化进行原位测量。该方法通过在重复加载-卸载实验中评估矿物填充 PVC 的变形引起的空化来证明。通过利用缺口圆形拉伸试样的轴对称性获得约 3 s 的时间分辨率。在整个实验过程中捕获了相对密度的演变，揭示了空隙成核和空隙生长之间的相互作用。