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Discussion of the article, “experimental strain analysis of the Iosipescu shear test specimen”
No full textThe losipescu in-plane shear test: validation on an isotropic material
No full textThe purpose of this paper is to compare the value of the shear modulus of an isotropic material (PMMA) obtained from both tensile and losipescu shear tests. A finite-element model is introduced to account for a nonuniform stress distribution in the losipescu coupon. A correction accounting for nonuniform strain values over the strain-gage section is also introduced. Rigorous statistical data processing leads to an estimation of the error between the moduli obtained by the two tests. Some points relevant to the losipescu test are reviewed, particularly concerning the sample preparation. Provided that a careful procedure is followed, excellent agreement is achieved between the shear moduli measured by the two method
The Iosipescu in-plane shear test applied to composites: a new approach based on displacement field processing
No full textAssessment of Approximate Models to Evaluate Transient and Cyclical Hygrothermoelastic Stress in Composite Plates
No full text
Internal Stresses Induced by Cyclical Environmental Conditions in Laminated Composite Plates
No full textNew ideas on the measurement of the in-plane shear strength of unidirectional composites
No full textThis paper addresses the issue of the measurement of the in-plane shear strength of unidirectional composites. It is shown from recently published material that for both Iosipescu and 100 off-axis tensile tests, failure under a homogeneous stress state is achieved. However, these stress states are not pure shear and it is shown that ignoring the presence of transverse tensile and compressive stresses, respectively in the 100 off-axis and the Iosipescu tests, would lead to important apparent differences in the in-plane shear strength measured from both tests.An analysis using a quadratic failure criterion underlines the role of the transverse stresses and values of 95 and 98 MPa for the shear strength of unidirectional T300/914 are derived respectively from the 100 off-axis and the Iosipescu tests
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