Residual Stresses in Fibrous Metal Matrix Composites: A Thermoviscoplastic Analysis

摘要: The vanishing fiber diameter model together with the thermoviscoplasticity theory based on overstress are used to analyze thermomechanical rate (time)-dependent behavior of unidirectional fibrous metal—matrix composites. For present analysis fibers assumed be transversely isotropic thermoelastic and matrix constitutive equation is thermoviscoplastic. All material functions constants can depend current temperature. Yield surfaces loading/unloading conditions not in which inelastic strain solely a function overstress, difference between stress equilibrium stress, state variable theory. Assumed but realistic elastic viscoplastic properties as temperature close Gr/Al B/Al composites permit computation residual stresses arising during cool down from fabrication. These influence subsequent mechanical transverse directions. Due viscoplasticity time-dependent effects such creep change time depicted. affecting free thermal expansion composite under cycling. computational results agree qualitatively scarce experimental results.