STRESS ANALYSIS OF A HEAT-ACTIVATED COUPLING JOINT SUBJECTED TO HYDROSTATIC INTERNAL PRESSURE

摘要

Heat-activated coupling (HAC) joint is an innovative joining method developed recently. A successful HAC joint should be able to carry a high-pressure fluid without failure. The understanding of the stress distributions in the joint subjected to inner pressure would help to design such a HAC joint. Owing to the limited length of the prepregs along the longitudinal axis, this is a 3-D problem instead of 1-D problem. A superposition approach is used to derive the formulations. This is a two-step procedure. At the first step, a plane strain condition is assumed for the joint. The formulations can be obtained by satisfying all the boundary conditions and interfacial conditions in the radial direction and partially in the axial direction. At the second step, the remaining boundary conditions in the axial direction are satisfied. The Love stress function is used to develop the formulations at this step. Parameters effecting on the stress-strain distributions in the HAC joint are discussed using the calculated results. Approaches to enhance the survivability of the HAC joint are proposed based on the calculated results.