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Modeling of Distortion of a Steel Bracket Sand Casting

机译：钢托架砂铸件变形的建模

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Modeling the thermo-mechanical behavior of bonded sand is essential for predicting casting distortions. In this study, steel casting experiments involving a steel U-shaped bracket are performed to investigate the effect of core restraint. The gap opening between the bracket legs is measured in-situ using LVDTs (Linear Variable Differential Transformers) that are attached to quartz rods embedded into the bottom of each leg. During cooling, the core restrains thermal contractions of the steel and pushes the legs outward, generating distortions. To simulate the experiments, calculated transient temperature fields are input into a finite element stress analysis code. The steel is modeled using an elasto-visco-plastic constitutive law, while the core employs the Drucker Prager Cap model. After adjustments to the high-temperature core sand properties, the observed distortions are accurately predicted.
机译：对粘结砂的热机械行为进行建模对于预测铸件变形至关重要。在这项研究中，进行了涉及钢制U形支架的铸钢实验，以研究岩心约束的效果。支架脚之间的间隙开口是使用LVDT（线性可变差动变压器）进行现场测量的，该LVDT连接到嵌入在每个腿底部的石英棒上。在冷却过程中，型芯会抑制钢的热收缩，并将支脚向外推，从而产生变形。为了模拟实验，将计算出的瞬态温度场输入到有限元应力分析代码中。使用弹塑性-粘塑性本构模型对钢进行建模，而核心使用Drucker Prager Cap模型。在调整了高温岩心砂的性质之后，可以准确预测观察到的变形。

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