通过密闭容器单轴压榨试验，明确了蓖麻籽散粒体压榨过程中塑性阶段的应力-应变关系，建立了蓖麻籽散粒体单轴压榨塑性本构模型，确定了幂次强化模型参数，并将试验结果和单轴压榨塑性本构模型计算结果进行了比较．综合对比结果表明，基于Doraivelu屈服准则的蓖麻籽散粒体等效应力-应变模型验证了压榨过程中的幂次强化规律，在塑性阶段，相同大小加载力条件下，等效应变与单轴加载时轴向应变最大相对误差为8.3％，平均相对误差为5.41％．%By the cold pressing experiments in a closed container , the stress-strain relationship of the cas-tor seeds was identified and the constructive model was established as well as the model parameters .By comparing the result of experiments with that of the plastic constitutive model based on Doraivelu ’ s yield criterion, the conclusion was drawn that the equivalent model reflected the hardening law of the castor seeds in practical pressing process well , and with the same axial stress in plastic stage , equivalent strain was maximum 8.3%higher than that of cold pressing while an average height was 5.41%.
展开▼
