Theoretical and experimental analysis of an arbitrarily inclined semi-infinite crack terminated at the bimaterial interface

Abstract

In this paper, the effect of the variations of material combinations on the fracture behaviour of an arbitrarily inclined crack terminated at a bimaterial interface was investigated. By using the complex variable method, a comprehensive analysis of the state of stress and stress intensity factors (SIFs) was performed. The digital photoelastic technique was also employed to verify the analytical results. To ensure the accuracy in the process of determining SIFs, a visual check between experimentally obtained images and theoretically reconstructed images was performed. It was concluded that far-field effects usually found in the homogeneous case had to be included in the stress equations.

Split singularities and the competition between crack penetration and debond at a bimaterial interface

“…1 illustrates two elastic materials bonded at an interface, and a crack impinging upon the interface at angle x, with the edge of the crack lying on the interface. For many combinations of the materials and the impinging angle, the two modes of the singular stress field have unequal real exponents (e.g., Bogy, 1971;Ashaugh, 1975;Fenner, 1976;Chen and Wang, 1996;Li et al, 1997). The impinging crack may either penetrate across, or debond, the interface (Fig.…”

<title>Experimental investigation of vibration behaviors of bonded structures</title>

“…A special casting procedure [7] was employed to manufacture the naturally bonded structures and thereby any possible influence of adhesive on dynamic characteristics could be avoided. The constituent materials of bonded structures are PMMA and EPON 828 and one side is clamped and others are free for the boundary condition.…”

Re-examination on thermal stresses of bonded structures

“…The base material of the photoelastic adherend is Epon 828 (Shell Company) and the other adherend is 6061-T6 aluminium alloy. The theory of preparing a true bimaterial specimen by Chen and Wang [7,8] was adopted. Details of the casting procedures are as follows:…”

“…A linear elastic analysis was employed. The mechanical properties of Epon 828 and aluminium alloy are respectively listed in Tables 1 and 2 [7,8,10]. Owing to the geometrical symmetry of the specimen, only half of the bimaterial structure was taken into account for the simulation.…”