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APPLICATION OF THE LOCAL APPROACH TO PREDICT BRITTLE FRACTURE FOLLOWING LOCAL COMPRESSION

机译:局部方法在局部压缩后预测脆性骨折的应用

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In this paper application of the local approach to predict the fracture behaviour of A533B ferritic steel at low temperature, in presence of a residual stress field, is investigated. The local approach assumes a Weibull probability distribution for the fracture toughness data and is based on the work of the Beremin group. In the work presented here, the Weibull parameters are calibrated to fracture data obtained at low temperature for specimens containing no residual stress fields. The same parameters are then used to predict the fracture behaviour of specimens containing a residual stress field which has been introduced by the local compression technique. Local approach predictions obtained using finite element analysis and experiments demonstrated a reduction in the low temperature fracture toughness of laboratory specimens following local compression. However, the decrease in experimental fracture toughness data is not as high as predicted by numerical simulations using the local approach.
机译:在本文中,研究了局部方法来预测低温下的A533B铁素体钢的断裂行为,在残余应力场的存在下。局部方法假设断裂韧性数据的威布尔概率分布,并且基于Beremin组的工作。在此处呈现的工作中,将威布尔参数校准以在低温下获得的裂缝数据,用于不含残留应力场的样品。然后使用相同的参数来预测含有由局部压缩技术引入的残余应力场的样本的断裂行为。使用有限元分析获得的局部方法预测和实验证明了局部压缩后实验室标本的低温断裂韧性的降低。然而,实验性裂缝韧性数据的降低不如使用本地方法的数值模拟所预测的那么高。

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