期刊
POLYMER TESTING
卷 91, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2020.106834
关键词
In situ X-ray computed tomography; Cavitation; Thermoplastics; Digital image correlation
资金
- Research Council of Norway through the Centre for Advanced Structural Analysis [237885]
- Norwegian Research Council [208896]
- Research Council of Norway through the FRINATEK project 4D-CT [275182]
- Centre of Excellence funding scheme [262644]
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.
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