Accession Number : ADA017663

Title :   Energy Methods in Optimization of Composite Materials.

Descriptive Note : Final rept. Jun 74-Jul 75,

Corporate Author : VERMONT UNIV BURLINGTON DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : McLay,Richard W. ; Murphy,Michael C.

Report Date : JUL 1975

Pagination or Media Count : 29

Abstract : A theory of fracture is presented for a quasistatic, adiabatic process. The theory is based on the principle of the maximum rate of entropy production. It is founded on the fundamentals of continuum mechanics and the calculus of variations. Specifically, the motion of the crack is discussed, including initiation, its direction as determined by a variational principle, crack arrest, and the conditions for instability in the running crack. The theory is seen to predict results of previous authors. Experimental results appear. (Author)

Descriptors :   *COMPOSITE MATERIALS, FRACTURE(MECHANICS), ENTROPY, CONTINUUM MECHANICS, CALCULUS OF VARIATIONS, CRACKS, THEORY

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE