Unveiling 3D Deformations in Polymer Composites by Coupled Micro X-Ray Computed Tomography and Volumetric Digital Image Correlation

B. Croom, W. M. Wang, J. Li, X. Li

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

A new method combining micro-X-ray computed tomography (μXCT) and volumetric digital image correlation (V-DIC) in conjunction with in-situ mechanical testing was used to probe three-dimensional (3D) deformation behavior in a friction stir blind rivet (FSBR) joint of carbon fiber reinforced polymer (CFRP) composite. Intrinsic microstructural features such as fibers, pores and metal inclusions enabled accurate volumetric strain calculation of dense fiber reinforced polymer composites using V-DIC without the need for high-contrast additives. Deformation calculated with V-DIC was employed to determine variation of local mechanical properties within the FSBR altered stir-zone microstructure. Unique deformation mechanisms such as internal interfacial shear and microstructure-dependent local buckling were observed in situ. The obtained 3D microscale strain maps revealed that the deformation behavior in joint-affected zones was fundamentally different from that of the bulk composite. Combined μXCT and V-DIC were shown to be effective for understanding 3D microscale deformations in composites.

Original languageEnglish (US)
Pages (from-to)999-1016
Number of pages18
JournalExperimental Mechanics
Volume56
Issue number6
DOIs
StatePublished - Jul 1 2016

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Tomography
X rays
Composite materials
Polymers
Rivets
Friction
Microstructure
Fibers
Mechanical testing
Carbon fibers
Buckling
Mechanical properties
Metals

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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Unveiling 3D Deformations in Polymer Composites by Coupled Micro X-Ray Computed Tomography and Volumetric Digital Image Correlation. / Croom, B.; Wang, W. M.; Li, J.; Li, X.

In: Experimental Mechanics, Vol. 56, No. 6, 01.07.2016, p. 999-1016.

Research output: Contribution to journalArticle

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