FEM ANALYSIS OF INTERNAL STRESSSUPERPLASTICITY IN AL/SICW COMPOSITE WITHDIFFERENT VF SUBJECTED TO THERMAL CYCLING

摘要

Special specifications of whiskers reinforcedMetal Matrix Composites (MMCs) have madethese materials very attractive for the aerospaceapplications. However, it is so difficult toconform these materials to complex shapes. Inrecent years, some experimental attempts havebeen made to extend the borders ofsuperplasticity science to promote superplasticcharacteristic of MMCs. But, a few numericalstudies would be found on the simulation of thesuperplastic process. In the present study it istried to highlight the difficulties involved withthe FEM modeling of superplasticity in MMCs.The results of this simulation work are verypromising and have shown a reasonableagreement with the experimental resultsavailable on the Internal Stress Superplasticity(ISS) tests and strain-rate-sensitivity data.Specifically, the strain rate vs. stress diagramsobtained from the simulation and experimentsshow an acceptable correlation.