Investigation of the effect of microstructural parameters on the initial yield surface of non-isothermal composites

摘要

In this paper, the effects of microstructural parameters on the initial yield surface of non-isothermal composites were investigated. The fiber phase was assumed to be a linear elastic material, and the matrix was assumed to be a non-linear material. Incorporating the Bodner-Partom viscoplastic constitutive model into a high-fidelity generalized method of cells allowed the initial yield surfaces of non-isothermal composites with different microscopic arrays and fiber cross-section shapes to be studied. Moreover, working temperature effects on initial yield surface are also discussed. The results show that the initial yield stress in the σ_( xx )–σ_( yy )plane of unidirectional fiber-reinforced composites tends to decrease with increasing working temperature. Furthermore, the effects of fiber arrays and fiber off-axis angles on initial yield stress show similar variation at different working temperature conditions.