Off-axis Flexure Test: A New Method for Obtaining In-plane Shear Properties-Reference-Cited by-同舟云学术

Off-axis Flexure Test: A New Method for Obtaining In-plane Shear Properties

Published:2005-06 Issue:11 Volume:39 Page:953-980
ISSN:0021-9983
Container-title:Journal of Composite Materials
language:en
Short-container-title:Journal of Composite Materials

Author:

Mujika F.¹,Valea A.²,Gañán P.³,Mondragon I.⁴

Affiliation:

1. Mechanical Engineering Department; EUP, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Plaza de Europa 1, 20018 San Sebastián/Donostia, Spain

2. Chemical and Environmental Engineering Department; EUITI, Universidad del País Vasco/Euskal Herriko Unibertsitatea, La Casilla 3, 48012 Bilbao, Spain

3. Universidad Pontificia Bolivariana, Grupo Nuevos Materiales, Medellín 56006, Colombia

4. Chemical and Environmental Engineering Department; EUP, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Plaza de Europa 1, 20018 San Sebastián/Donostia, Spain

Abstract

Off-axis three-point flexure test for unidirectional composites is proposed as a new method for obtaining in-plane shear modulus and in-plane shear strength. The method of determination of the in-plane shear modulus GLT has been explained in a previous work where the displacement field of an off-axis flexure test was analyzed. In the present work, besides summarizing the calculation equations of GLT, the condition of small displacements is analyzed. Otherwise, an error analysis is carried out in order to study the influence of the calculated value of GLT on the other elastic parameters. Normal and shear stresses in the fiber–matrix interface change from point to point in the specimen depending on the fiber orientation angle and specimen geometry. A critical point of failure that depends on the fiber orientation angle is determined and optimum conditions for obtaining in-plane shear strength are discussed. Experiments for different fiber orientations and geometric conditions have been carried out for IM7/8552 epoxy matrix based carbon fiber reinforced unidirectional composite material.

Publisher

SAGE Publications

Subject

Materials Chemistry,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites

Link

http://journals.sagepub.com/doi/pdf/10.1177/0021998305048735

Reference15 articles.

1. On the Displacement Field for Unidirectional Off-Axis Composites in 3-Point Flexure — Part 1: Analytical Approach

2. On the Displacement Field for Unidirectional Off-Axis Composites in 3-point Flexure - Part II: Numerical and Experimental Results

3. Determination of shear strength of unidirectional composite materials with the Iosipescu and 10° off-axis shear tests

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