A technique for in situ X-ray computed tomography of deformation -induced cavitation in thermoplastics

被引：5
作者：
Olufsen, Sindre Nordmark [1 ]
Tekseth, Kim Robert [2 ]
Breiby, Dag Werner [2 ]
Clausen, Arild Holm [1 ]
Hopperstad, Odd Sture [1 ]
机构：
[1] Norwegian Univ Sci & Technol, NTNU, Dept Struct Engn, Ctr Adv Struct Anal CASA, NO-7491 Trondheim, Norway
[2] Norwegian Univ Sci & Technol, NTNU, PoreLab, Dept Phys, NO-7491 Trondheim, Norway
来源：
POLYMER TESTING | 2020年 / 91卷
关键词：
In situ X-ray computed tomography; Cavitation; Thermoplastics; Digital image correlation; MICROSTRUCTURAL EVOLUTION; STRAIN-RATE; BEHAVIOR; POLYMERS; DAMAGE; HDPE; PVC;
D O I：
10.1016/j.polymertesting.2020.106834
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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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页数：11
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