Analysis of Crack Propagation in Thin Metal Sheet, Three Point Bend Specimen, and Double Cantilever Beam
Negarullah Naseebullah Khan1, Nitesh P. Yelve2
1Negarullah Naseebullah Khan, Mechanical Engineering Department, Mumbai  of Technology, Vashi, Navi, Mumbai, India.
2Nitesh P. Yelve, Mechanical Engineering Department, of Technology, Vashi, Navi Mumbai, India.
Manuscript received on July 22, 2013. | Revised Manuscript received on August 01, 2013. | Manuscript published on August 30, 2013. | PP: 1-7 | Volume-2, Issue-6, August 2013.  | Retrieval Number: F1925082613/2013©BEIESP

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Abstract: Fracture Mechanics provides a theory background for failure of material and structures containing cracks. Stress intensity factor (SIF) is a key parameter in crack analysis. Because of the importance of SIF, its solutions for crack under different types of loading have been paid considerable attention. In the present study the SIF is calculated for thin metal sheet and three point bend specimen using finite element (FE) method. For the side crack in thin metal sheet, 2-D model is created in FE to calculate the SIF and this SIF is compared with that obtained by analytical method. For three point bend specimen, 3-D model is created in FE to calculate the SIF and this SIF is then compared with that obtained through experiments in the literature. The effect of thickness on the SIF is also estimated for three point bend specimen. It is also attempted here to understand crack propagation in layered materials such as composite materials, coated materials, etc. where the individual layers of materials are bonded together. For this purpose, an experiment is conducted on aluminium double cantilever beam (DCB) and results are plotted for load versus displacement. Also the simulation is carried out in FE using cohesive zone modeling (CZM) for the similar aluminium DCB, and the results are compared with these obtained through experiment.
Keywords: Stress intensity factor, three point bend specimen, double cantilever beam, traction separation law, cohesive zone modeling.