A technique for in situ X-ray computed tomography of deformation-induced cavitation in thermoplastics
Olufsen, Sindre Nordmark; Tekseth, Kim Robert Bjørk; Breiby, Dag Werner; Clausen, Arild Holm; Hopperstad, Odd Sture
Peer reviewed, Journal article
Published version
Åpne
Permanent lenke
https://hdl.handle.net/11250/2735299Utgivelsesdato
2020Metadata
Vis full innførselSamlinger
- Institutt for fysikk [2708]
- Institutt for konstruksjonsteknikk [2483]
- Publikasjoner fra CRIStin - NTNU [38672]
Sammendrag
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.