【摘要】 作者研究了铝铜合金准固态力学行为和凝固过程应力应变及热裂纹形成规律,得到了以下主要结果:(1)阐述了准固态断裂应变和低强塑性区的物理本质和意义及准固态力学性能与热裂倾向性的关系;(2)确立了铝合金准固态建模方法,建立了Al-5．14%Cu合金准固态流变模型和力学本构方程;(3)模拟了有热节拘束端棒形件和应力框凝固过程应力、应变和热裂纹的形成规律。更多还原

【Abstract】 In this paper the mechanical belavior in quasi-solid of Al-Cu alloys and formation law of stress,strain and hot cracking during solidification are investigated. The results are follows:(1) the physical essence and significance on the quasi-solid failure strain and low strength plasticity region, and the relationship between the mechanical properties in the puasi-solid and the. tendence of hot cracking are clarified) (2)the method model establishment of the aluminium alloy in the quasi-solid is put forward,rheologic model and constitutive equations of Al-5.14%Cu alloys are established) (3)formation law of the stress, strain and hot cracking of the cast bar with hot spot and restricted ends, and the stress-frame are simulated numericalically.更多还原