Abstract
In this paper, for the sake of prediction of caustic experiments, explanation and verification of experimental results, a new numerical method based on the finite element method, which can directly simulate the caustic patterns, is presented. Based on this new idea, the program for directly determining the gradient solution from the 2 dimensional displacement solution is presented. It is also proven to be necessary for only 8 or 12 node isoparametric element to apply this new method to the 2 dimensional problem. For verifying the accuracy of this method, the simulations of 4 point bending problem and concentrated load problem are performed. The simulated results have good agreement with the theoretical values. As the applied examples, the simulation is carried out for the plate specimen with a single edge crack, or double edge crack, or a short single edge crack under mode I condition. The changes of caustic image under the influence of the interferometry between cracks and the influence of the boundary are given.
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