根据“表观总应变能达到一个临界值时材料开始屈服”这一概念, 研究和建立了多孔材料轧制塑性变形屈服准则, 根据“多孔材料变形时质量不变”原理建立了轧制变形过程中高向变形与相对密度、 高向变形与纵向变形、泊松比与相对密度的关系. 理论预测与用喷射沉积制备的FVS0812耐热铝合金多孔材料的轧制结果符合得较好; 建立了多孔材料轧制变形相对密度与高向应力的关系, 提高多孔材料所处的压应力状态可以加速材料的致密化速度, 改善多孔材料的轧制成形性能.
The yield criterion for porous materials during rolling is proposed based on the concept of “the materials begin to yield when the apparent strain energy approaches to a critical value”. The relationships between thickness strain and relative density, thickness strain and longitudinal strain, plastic Poisson ratio and relative density, relative density and thickness stress during rolling are derived according to the mass conservation law. The theoretical predictions show a good agreement with the experimental results of FVS0812 heat resistant porous aluminium alloy prepared by spray deposition technology.
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