DETERMINATION OF KI, KII AND TRAJECTORY OF INITIAL CRACK BY ADAPTIVE FINITE ELEMENT METHOD AND PHOTOELASTIC TECHNIQUE (original) (raw)
2009, Experimental Techniques
L ife prediction of single or multi-material products is one of the most important studies in engineering design and maintenance. Crack propagation speed and its trajectory are the key behaviors to assess the life of products. Determination of the stress intensity factors on crack tip are needed to accurately predict the crack propagation and its trajectory. Several numerical methods and nondestructive experimental techniques are currently being used to determine such phenomena. The photoelastic technique with an optic-experimental interference has been employed to determine the stress intensity factors and the crack's trajectories. 1-4 Its principle is based on the double refraction phenomenon by analyzing the maximum shear stress induced in the transparent or birefringent of the photoelastic model under loading. The phenomenon is observed by looking through the optical elements, i.e. the polarizer and the analyzer of the polariscope, as demonstrated in . Their results provide information that can be applied directly to metal prototypes by using the law of similarity. At present, several numerical methods have also been developed to predict crack propagation phenomenon. These methods include the finite element method, 5-7 the meshless method, 8,9 the manifold method with virtual crack extension, 10 and the boundary element method. 11
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