A technique for in situ X-ray computed tomography of deformation-induced cavitation in thermoplastics
A technique for in situ X-ray computed tomography of deformation-induced cavitation in thermoplastics
复制标题
热塑性塑料中变形引起空化的原位 X 射线计算机断层扫描技术
DOI：
10.1016/j.polymertesting.2020.106834
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发表时间：
2020
期刊：
影响因子：
5.1
通讯作者：
O. Hopperstad
中科院分区：
文献类型：
--
作者：
S. Olufsen;K. Tekseth;D. Breiby;A. Clausen;O. Hopperstad
形变引起的空化影响聚合物材料的力学响应，但在现场测量空穴的空间演化通常需要使用同步辐射源。这项研究的目的是开发和演示一种方法，使用家庭实验室的X射线计算机断层扫描装置，在轴对称聚合物样品中进行变形诱导空化的现场测量。在反复加载-卸载实验中，对矿物填充聚氯乙烯的形变诱导空化进行了评估。通过利用缺口圆拉伸试件的轴对称，获得了约3×S的时间分辨率。在整个实验过程中捕捉到了相对密度的演变，揭示了空穴形核和空穴生长之间的相互作用。与通过数字图像相关获得的表面变形测量相结合，本技术产生了适合于材料模型校准和验证的数据。
Deformation-induced cavitation influences the mechanical response of polymeric materials, but acquiringin situmeasurements 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 forin situmeasurements 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.