Mendels, D A; Shaw, R M (2002) Determination of mode II energy release rate in composite laminates by the modified double-lap shear test. NPL Report. MATC(A)125

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Abstract

This document introduces a new test method for the mode II fracture energy of composite laminates. The geometry of the test is adapted from the modified double-lap shear test used for adhesion testing of lap-joints. It minimises peel stresses and facilitates specimen fabrication, and thereby increases test reproducibility. The analysis follows the energy release rate approach, based on the shear lag theory in multiple layer systems, and includes internal stresses and also friction stresses when debonding of an interface is introduced. Axial and shear stresses, as well as displacements, are calculated for specimens stressed in the elastic regime. The energy release rate, depending only on average axial stresses and axial displacements, is also obtained. It is shown that the present model captures all the essential features of the energy release rate, including the effects of internal stresses and of friction at the debonded interface, within a certain range of debond length and friction stress. An experimental study, using electronic speckle pattern interferometry (ESPI), is conducted to validate the models.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)125
Subjects:	Advanced Materials Advanced Materials > Composites
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2979

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