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有限变形下的后继屈服面会出现膨胀或收缩,移动和畸变等变形特征。基于塑性变形的滑移机制,建立了适用于有限变形条件下的多晶塑性本构模型。提出了一种混合硬化假设,可以一致描述后继屈服面演化中的等向、运动和畸变硬化以及正或负交叉效应、包氏效应等。预测了2种加工硬化铝合金(Al6061-T6511和annealed1100Al)分别在单轴拉伸和纯扭转下的后继屈服面演化过程,与已有实验结果符合一致。
Subsequent yield surfaces under finite deformation will exhibit deformation characteristics such as expansion or contraction, movement and distortion. Based on the slip mechanism of plastic deformation, a polycrystalline plastic constitutive model suitable for finite deformation was established. A hybrid hardening assumption is proposed to describe the isotropic, kinematic and distortion hardening and the positive or negative cross-effect and the package’s effect in the evolution of the subsequent yield surface. The evolution of the yield surface of the two kinds of work-hardened aluminum alloys (Al6061-T6511 and annealed1100Al) under uniaxial tension and pure torsion was predicted, which is consistent with the experimental results.