X-ray computed tomography investigation of dilation of mineral-filled PVC under monotonic loading

被引：7
|
作者：
Olufsen, Sindre Nordmark [1 ]
Clausen, Arild Holm [1 ]
Breiby, Dag Werner [2 ]
Hopperstad, Odd Sture [1 ]
机构：
[1] Norwegian Univ Sci & Technol, NTNU, Dept Struct Engn, Struct Impact Lab SIMLab, NO-7491 Trondheim, Norway
[2] Norwegian Univ Sci & Technol, NTNU, Dept Phys, PoreLab, NO-7491 Trondheim, Norway
来源：
MECHANICS OF MATERIALS | 2020年 / 142卷
关键词：
Polyvinyl chloride; PVC; X-ray computed tomography; Triaxiality; Strain rate; Digital image correlation; Tensile test; Volume change; STRAIN-RATE; BEHAVIOR; DEFORMATION; EVOLUTION; HDPE;
D O I：
10.1016/j.mechmat.2019.103296
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The deformation-induced dilation of mineral-filled polyvinyl chloride (PVC) is investigated by means of polychromatic X-ray absorption tomography (XCT). Axisymmetric notched tensile specimens are strained to prescribed elongations using a tensile test apparatus and subsequently scanned by XCT after relaxation. During straining, surface deformations are quantified by digital image correlation (DIC) and contour tracking. The influence of stress triaxiality and strain rate on dilation is investigated by using tensile specimens with three different notch radii, all strained to three deformation levels at two different nominal strain rates. Pronounced reduction of density, corresponding to an increase of volume, is observed for all specimens in the XCT scans, but markedly different relative density distributions are measured for the three geometries. The accuracy of the polychromatic XCT density estimates is evaluated against data obtained with monochromatic synchrotron radiation computed tomography (sr-XCT), and a comparison to surface deformation-based dilation estimates is presented.
引用
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页数：12
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