Measurement of bimaterial interface fracture parameters using modified SEN beam specimens and coherent gradient sensing

Hareesh V. Tippur; Sreeganesh Ramaswamy

doi:10.1117/12.158597

27 September 1993 Measurement of bimaterial interface fracture parameters using modified SEN beam specimens and coherent gradient sensing

Hareesh V. Tippur, Sreeganesh Ramaswamy

Author Affiliations +

Proceedings Volume 1999, Adhesives Engineering; (1993) https://doi.org/10.1117/12.158597
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

A modified edge notched flexural (MENF) specimen in a three point loading configuration is proposed for testing crack initiation toughness of bimaterial interfaces. An interface with a relatively large stiffness mismatch between two dissimilar materials, Aluminum-PMMA, is considered. The deformations near interface cracks are mapped in real time using a full-field optical method called Coherent Gradient Sensing (CGS). The homogeneous counterparts of MENF specimens have produced a fairly wide range of mode-mixities in our previous studies. This paper presents details regarding the extension of the model to bimaterial interface crack tip measurements and fracture toughness testing. The CGS measurements are used to extract both crack tip stress intensity factors as well as mode mixities using plane elastostatic interface crack tip fields. The results are compared with the ones from a beam model. The load data corresponding to crack initiation is used for evaluating fracture toughness of the interface as a function of mode mixity.

Citation Download Citation

Hareesh V. Tippur and Sreeganesh Ramaswamy "Measurement of bimaterial interface fracture parameters using modified SEN beam specimens and coherent gradient sensing", Proc. SPIE 1999, Adhesives Engineering, (27 September 1993); https://doi.org/10.1117/12.158597

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