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Experimental measurements are described of various types and stages of crack-tip deformation which accompanies crack growth in boron-aluminum sheet and in laminar steel plate. Optical interference and oblique-light photography are used to show the interaction of a crack with individual fibers and layers in the two systems for various tensile loads and specimen configurations. A fracture mechanics analysis is used to categorize the fracture behavior of boron-aluminum specimens of different fiber orientation. The crack-tip deformation in laminar steel plate under fatigue load is related to the interlayer bond strength and to the subsequent fracture behavior of the plate.
composite materials, fracture tests, cyclic loads, crack propagation, deformation
Benét Weapons Laboratory, Watervliet, N.Y.