Abstract
In recent years, some researchers have studied about shape memory alloy composites(SMACs) which consist of a shape memory alloy (SMA) reinforcement and polymer ormetal matrix. In particular, considerable attention has been paid to the creation of internalstress in a matrix of SMAC. Internal stress in a matrix can be created when adeformed SMA fiber recovers its original shape in a composite. On the otherhand, deformation of the composite appears when internal stress is created inmatrix. Therefore, an interaction exists between the creation of internal stress inthe matrix and deformation of the composite. The main purpose of the presentresearch is to investigate the effect of fiber volume fraction and aspect ratio(l/d:length divided by diameter of fiber) on the creation of internal stress in the matrix anddeformation for a short-fiber SMA reinforced composite (S-SMAC) under thermal loadings.In the present paper, a constitutive relation of S-SMAC is proposed on the basis of theshear-lag model. Then, the effects of fiber volume fraction and aspect ratio on the creationof internal stress in the matrix and deformation of the composite are investigated by usingthe proposed constitutive relation for S-SMAC under thermal loadings. The mainconclusions are as follows: composite shrinkage and compressive residual stress in thematrix increase with increasing aspect ratio and fiber volume fraction after heating. Also,the composite strain history and residual stress history in the matrix are differentaccording to the fiber volume fraction and aspect ratio during heating. The change ofaspect ratio has a small effect on the creation of internal stress in the matrixand deformation of the composite. The performances of S-SMAC come close tothat of long-fiber SMA reinforced composite (L-SMAC) when the aspect ratio is>25. Also, residual stresses in the fiber and matrix before heating influence the creation ofinternal stress in the matrix and deformation of the composite during heating.
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