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International Journal of Material Forming

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16-08-2019 | Original Research

Picture-frame testing of woven prepreg fabric: An investigation of sample geometry and shear angle acquisition

Authors: Christian Krogh, Kari D. White, Alessandro Sabato, James A. Sherwood

Published in: International Journal of Material Forming | Issue 3/2020

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Abstract

This paper examines different concepts in relation to the picture-frame test for shear characterization of a woven prepreg fabric. The influence of the sample arms is investigated by means of cut slits as well as removed transverse tows. Shear angles are obtained using Digital Image Correlation (DIC) and also from images taken during the test which are processed for fiber angles directly from the weave texture. The image processing relies on the Hough transform in MATLAB. The concept of constant shear strain rate is discussed and implemented in the test software by a multi-linear crosshead velocity profile. Finally, bias-extension data are obtained and used for comparison. It is found that the sample arm modifications have a pronounced effect on the measured shear load whereas the uniformness of the shear strain field in the samples is not improved considerably.

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Title: Picture-frame testing of woven prepreg fabric: An investigation of sample geometry and shear angle acquisition
Authors: Christian Krogh
Kari D. White
Alessandro Sabato
James A. Sherwood
Publication date: 16-08-2019
Publisher: Springer Paris
Published in: International Journal of Material Forming / Issue 3/2020
Print ISSN: 1960-6206
Electronic ISSN: 1960-6214
DOI: https://doi.org/10.1007/s12289-019-01499-y

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