Shakedown of Unidirectional Composites.
Interim technical rept. no. 5,
DUKE UNIV DURHAM N C DEPT OF CIVIL ENGINEERING
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Substantial shakedown effects in unidirectional metal matrix composites have been found to exist for loading states which are axisymmetric with respect to the fiber axis, and which include also a uniform thermal change. The shakedown limits for a variable cyclic loading program, can be found by a standard procedure involving the selection of parametric families of selfstress states. An alternative, direct approach to the determination of the shakedown limits is related to the recently developed kinematic hardening rules for symmetrically loaded fibrous composites. Specifically, shakedown will occur if the loading domain can be contained within a translated initial yield surface in the axisymmetric stress plane. Results are presented for B-Al, Be-Al, B-Ti and B-Mg composites.
- Laminates and Composite Materials