High-Performance Composite Materials for Vehicle Construction

A Finite Element Computer Program for the Elastoplastic Analysis of Crack Propagation in a Unidirectional Composite

by Tiina Repnau, Donald Frederick Adams

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User's guide and listings of two programs which calculate and plot the failure of filamentary composites, such as boron/aluminum or graphite/epoxy, under transverse loading. Such composite materials have very high compressive strength but only ordinary resistance to shear stress and strain. Using a tangent modulus, finite element analysis, FAILUR realistically simulates microscopic cracks developing at the filament/matrix boundary and propagating throughout the material. The program accommodates combinations of up to five different materials per sample. Voids of any size or shape can be included. Up to 50 stresses are permitted before the first element fails, and another 50 thereafter. For each increment, the program checks each element for failure. An automatic normalization procedure allows only as much stress as will produce each failure. When an element fails, its load is automatically redistributed, and the remaining elements are adjusted and rechecked. The double precision FORTRAN IV program requires 275,000 bytes of storage.

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