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CALIBRATION METHOD FOR THE BRITTLE FRACTURE ASSESSMENT PARAMETERS FOR MATERIALS BASED ON THE BEREMIN MODEL
CALIBRATION METHOD FOR THE BRITTLE FRACTURE ASSESSMENT PARAMETERS FOR MATERIALS BASED ON THE BEREMIN MODEL
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机译：基于贝雷明模型的材料脆性断裂评估参数的标定方法
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摘要
A calibration method for brittle fracture assessment parameters for pressure vessel materials based on the Beremin model includes selecting at least two types of specimens of different constraints, and calculating the fracture toughness values K0 corresponding to 63.2% failure probability for each type of specimens at a same calibration temperature by using the respective fracture toughness data. The method proceeds by obtaining the stress-strain curve of the material at the calibration temperature, generating finite element models for each type of specimens, and calculating the maximum principal stress and element volume of every element at K=K0 in each model. A series of values of m are assumed to compute a group of σu values for each type of specimens, and then m˜σu curves are plotted for each type of specimens. Brittle fracture assessment parameters are then determined for the material according to the coordinates of the intersection of the m˜σu curves.
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机译：基于Beremin模型的压力容器材料脆性断裂评估参数的校准方法包括：选择至少两种约束条件不同的试样，并计算断裂韧性值K 0 ，对应于63.2％的破坏概率通过使用各自的断裂韧性数据，在相同的校准温度下对每种类型的样品进行测试。通过在校准温度下获得材料的应力-应变曲线，为每种类型的样本生成有限元模型并计算在K = K 0处每个元素的最大主应力和元素体积，该方法得以进行。子>在每个模型中。假设一系列m值可为每种类型的样本计算一组σ u 值，然后为每种类型的样本绘制m〜σ u 曲线。然后根据m〜σ u 曲线的交点坐标确定材料的脆性断裂评估参数。
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