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Multiple Delaminations and their Severity in Circular Axisymmetric Plates Subjected to Transverse Loading

Department of Mechanical Engineering, Faculty of Science and Technology, Sophia University, Tokyo, Japan

Osamu Majima

Department of Mechanical Engineering, Faculty of Science and Technology, Sophia University, Tokyo, Japan

Instability problem of multiple penny-shape interlaminar delaminations in circular axisymmetric plates subjected to a transverse concentrated loading is theoretically studied. The authors consider a case that all the delaminations located at the same intervals have a same size and propagate simultaneously. Then, they consider two cases that one of the delaminations is larger or smaller than the rest. The energy release rates are obtained in closed forms and the results are compared with those obtained numerically via a finite element analysis. The present solutions agree excellently with the finite element results. When the load is constant, the energy release rate is constant regardless of the size of the delaminations and increases linearly with the number of the delaminations. When one of the delamination is larger or smaller than the others, the energy release rate of the shorter delamination or delaminations become much larger than that of the longer delamination(s), that is, only the smaller delamination(s) tends to propagate until it grows up to the size of the larger delamination(s). Multiple delaminations, if they exist, have a tendency to grow self-similar way.

Key Words: composite material • circular plate • delaminations • energy release rate • impact

Journal of Composite Materials, Vol. 30, No. 4, 441-453 (1996)
DOI: 10.1177/002199839603000402


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