In-situ imaging of flexure-induced fracture in tape-laminate composites using high-resolution X-ray computed tomography

Wingate, Brian P.; Czabaj, Michael W.

doi:10.1016/j.compscitech.2022.109288

Title: In-situ imaging of flexure-induced fracture in tape-laminate composites using high-resolution X-ray computed tomography

Journal Article · 26 January 2022 · Composites Science and Technology

DOI: https://doi.org/10.1016/j.compscitech.2022.109288 · OSTI ID:1981588

Wingate, Brian P. ^[1];

^[1]

Univ. of Utah, Salt Lake City, UT (United States)

Here, this study presents development of an in-situ flexure test for imaging progressive inter- and intralaminar fracture in tape-laminate composites using X-ray computed tomography (CT). The intent of this test is to provide detailed experimental observations of ply-level damage that can be used to validate existing, and develop new, progressive damage analysis (PDA) tools. The test consists of a vertically mounted specimen which is flexed using two eccentric compressive loads using an in-situ uniaxial load stage. The flexure specimen contains a starter notch mid-span which promotes initiation of composite failure within the X-ray field of view. Specimens with two different laminate stacking sequences were tested, imaged, analyzed. For a quasi-isotropic laminate with large angle changes between adjacent plies, there was near simultaneous growth of transverse cracks and delaminations below the midplane of the laminate. For a laminate with small angles between adjacent plies, there was extensive formation of transverse crack networks which penetrated the laminate thickness without delamination growth. In addition to imaging fracture, the X-ray CT data from both specimen types were used to quantify the variability in thickness and analyze the local orientation of individual plies. Overall, the proposed test and the image-data analysis methodology provided an important insight into the fracture processes in tape laminates and highlights the inherent ply-level geometrical variabilities that should be accounted for in PDA simulations.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1981588

Journal Information:: Composites Science and Technology, Journal Name: Composites Science and Technology Journal Issue: C Vol. 220; ISSN 0266-3538

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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