扩散焊换热器垮塌载荷预测与试验研究

Collapse load prediction and experimental study of diffusion bonded heat exchanger

以扩散焊换热器出现不可限制的大变形为约束条件,建立板片厚度1.5 mm、流道半径0.9 mm、流道肋宽0.4 mm、材料316L的扩散焊换热器真实应力-应变的材料本构模型。采用弹-塑性应力分析方法预测结构垮塌载荷及结构载荷-位移曲线,并通过扩散焊换热器爆破试验及应变测试进行验证。结果表明:预测的垮塌载荷(121.7 MPa)与爆破试验值相对误差仅为2.64%,验证了扩散焊换热器芯体结构应力计算方法和计算模型的合理性,对扩散焊换热器工程设计具有重要意义。

The material constitutive model of real stress-strain of 316L diffusion bonded heat exchanger with 1.5 mm thickness,0.9 mm channel radius and 0.4 mm channel rib width was established under the constraint condition of unrestricted large deformation.The collapse load and load-displacement curve of the structure were predicted by the elastic-plastic stress analysis method,and verified by the bursting test and strain test of the diffusion bonded heat exchanger.The results show that the relative error between the predicted collapse load(121.7 MPa)and the bursting test value was only 2.64%,which verified the rationality of the calculation method and model for the core structure stress.This work is of great significance to the engineering design of diffusion bonded heat exchangers.