Mode I Fracture Toughness Evaluation of Adhesively Bonded Joints via J‐Integral and DIC

Abstract

Amorphous polymers, such as epoxy resins, are commonly used in the realization of adhesively bonded joints. In this paper an evaluation of mode I fracture toughness of bonded joints is presented. Moreover, an identification of cohesive zone model parameters via Rice's J-integral is described. Experimental tests are performed on double cantilever beam specimens and relative displacements between adherends are acquired by using the digital image correlation technique. The obtained interface law can be implemented in a finite element code for simulating the decohesion process of complex bonded structures.

Dissimilar friction stir lap welding of AA2198 and AA7075 sheets: forces, microstructure and mechanical properties

“…The grip area was defined as 25.4 × 25.4 mm 2 , whereas opportune tabs were used to avoid undesired stress components. The sides of the specimens were polished and then painted by using acrylic varnish to obtain a speckle pattern [31]. An MTS Insight universal testing machine was employed to conduct the lap shear test, whereas an industrial uEye camera equipped with a 25-mm objective lens was used to record the failure mode of each sample.…”

Dissimilar Friction Stir Lap Welding of AA2198 and AA7075 Sheets: Forces, Microstructure and Mechanical Properties

“…The grip area was de ned as 25.4 mm 2 , whereas opportune tabs were used to avoid undesired stress components. As already illustrated by Perrella et al [30], for the preparation to the test, the sides of the specimens were polished and then painted by using acrylic varnish to obtain a speckle pattern. During the lap shear test, an industrial uEye camera equipped with a 25mm objective was used to record the failure mode of each sample.…”

Experimental and numerical study on DCB specimens bonded with similar and dissimilar materials

“…Krueger [ 15 ] reviewed the history, approach and applications of VCCT, and discussed the problems associated with cracks propagating between different materials. Cricrì [ 16 ] and Perrella [ 17 ] proposed a novel identification method of CZM parameters and compared with approaches previous research. Rarani [ 18 ] studied the finite element model strategies of DCB test and discussed the advantages and limitations of VCCT, CZM and XFEM.…”