The fatigue behavior of a crack in a missile structure is studied using the dual boundary integral equations developed by Hong and Chen (1988) . This method, which incorporates two independent boundary integral equations, uses the displacement equation to model one of the crack boundaries and the traction equation to the other. A single domain approach can be performed efficiently. The stress intensity factors are calculated and the paths of crack growth are predicted. In order to evaluate the

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... esults of dual BEM, four examples with FEM results are provided. Two practical examples, cracks in a V-band and a solid propellant motor are studied and are compared with experimental data. Good agreement is found.