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Effect of Boundary Conditions on the Distribution of Mode I Fracture Toughness along Delamination Front in CFRP Laminates with General Fiber Orientation

Samborski S.

Mechanics and Mechanical Engineering

2016

Vol. 20, nr 2

121--127

The paper deals with numerical analysis of the DCB test configuration together with the data reduction scheme described in the ASTM D 5528 Standard for determination of the mode I fracture toughness in case of the laminated composites with mechanical couplings. The numerical analysis based on the FEM approach was performed with the Abaqus software exploiting the VCCT technique. The results show, that the distribution of the Strain Energy Release Rate can be asymmetric and that mode mixity can occur. A need for mode separation procedures and appropriate data reduction schemes has been revealed.

Experimental Study On Fracture Property Of Double Cantilever Beam Specimen With Aluminum Foam

Kim Y. C., Choi H. K., Cho J. U.

Archives of Metallurgy and Materials

2015

Vol. 60, iss. 2B

1151--1154

This study aims to investigate double cantilever beam specimen with aluminum foam bonded by spray adhesive to investigate the fracture strength of the adhesive joint experimentally. The fracture energy at opening mode is calculated by the formulae of British Engineering Standard (BS 7991) and International Standard (ISO 11343). For the static experiment, four types of specimens with the heights (h) of 25 mm, 30 mm, 35 mm and 40 mm are manufactured and the experimental results are compared with each other. As the height becomes greater, the fracture energy becomes higher. After the length of crack reaches 150 mm, the fracture energy of the specimen (h=35 mm) is greater than that of the specimen (h=40 mm). Fatigue test is also performed with DCB test specimen. As the height decreases, the fracture energy becomes higher. By the result obtained from this study, aluminum foam with adhesive joint can be applied to actual composite structure and its fracture property can possibly be anticipated.