Effects of Thermal Residual Stress on a Unidirectional Composite with Damage
The effects of thermal residual stresses on the stress distribution and strain energy release rate are estimated for a unidirectional composite with damage. It is shown that the composite is produced at a certain higher temperature than that of operational, if the thermal expansion coefficient of the matrix is higher than that of the fibers, both the maximum longitudinal stress in the matrix and the maximum shear stress ant the fiber-matrix interface increase. The maximum longitudinal stress in the fibers and the transverse normal stress along the fiber-matrix interface are not affected. The strain energy release rate varies linearly with the thermal coefficient mismatch between the fiber and the matrix. The thermal residual stresses will promote the crack extension if the thermal expansion coefficient of the matrix is higher than that of the fiber. On the other hand, the thermal residual stresses can improve the resistance to fracture if the thermal expansion coefficient of the fibers is higher than that of the matrix.
Y. Zhao and L. R. Dharani, "Effects of Thermal Residual Stress on a Unidirectional Composite with Damage," Computers and Structures, Elsevier, Jan 1993.
Mechanical and Aerospace Engineering
Article - Journal
© 1993 Elsevier, All rights reserved.