Tensile mode, problems with

In composite propellants, a relatively strong bond between binder and filler is important for obtaining high tensile strength. However, the edges and surfaces of the inclusions serve as sites of dangerously high stress concentrations, which could cause internal failure of the softer matrix material. Most studies (I, 2, 6-9) have dealt with the problem of matrix fracture induced by the inclusions. Here, we present the mode of matrix fracture called cavitation,... 

With the onset of shear lip formation, it should be recognized that the problem is no longer one of mode I, or tensile-opening mode. For the sake of simplicity. 

Dimensional considerations require that mode mixity is also only a function of p. The functions D, fi) and are determined by solving the asymptotic problem for a range of /8 values. The G relation defined by Eq. 26 can be specialized to the case of a tensile-loaded, adhesively bonded butt joint with rigid adherends by substituting the relationship for that geometry and loading (Eq. 8... 

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