中国激光, 2017, 44 (4): 0402002, 网络出版: 2017-04-10
接触热导率对CFRTP/不锈钢激光直接连接温度场的影响
Effect of Thermal Contact Conductanceon Temperature Field of CFRTP/Stainless Steel Laser Direct Joining
激光技术 激光直接连接 有限元模型 热接触模型 接触热导率 夹具压力 laser technique laser direct joining finite element model thermal contact model thermal contact conductance clamping pressure
摘要
为了提高碳纤热塑复合材料(CFRTP)/不锈钢激光直接连接(LDJ)数值模拟的准确性, 在实验的基础上拟合得到接触热导率计算公式, 建立了考虑界面接触热阻的三维有限元传热模型。理论仿真结果与实验结果的对比分析表明, 与传统模型相比, 热接触模型更符合实际情况, 可用于表征夹具压力对激光连接效果的影响。在激光功率为339 W、夹具压力为0.1 MPa时, 传统模型计算的相对误差为12.3%, 考虑接触热导率的热接触模型则将相对误差降至2.8%。该模型对提高激光直接连接数值模拟的准确性和工艺参数的优化选择具有重要价值。
Abstract
To improve the numerical simulation accuracy of carbon fiber reinforced thermal plastic (CFRTP)/stainless steel laser direct joining (LDJ), a fitting formula of thermal contact conductance is established based on the experiments. Taking the thermal contact resistance into account, we establish a three-dimensional finite element thermal contact model of LDJ. The theoretical simulation and experimental results are compared and analyzed. The results show that the thermal contact model is more consistent with the reality compared with the traditional model. Therefore, the thermal contact model can be used to characterize the influence of clamping pressure on the laser joining quality. When the laser power is 339 W and the clamping pressure is 0.1 MPa, the relative error is 12.3% for the traditional model and it is reduced to 2.8% for the thermal contact model. The numerical model can help to improve the accuracy of numerical simulation in the process of LDJ and choose optimal technological parameters.
王强, 焦俊科, 昝少平, 张文武. 接触热导率对CFRTP/不锈钢激光直接连接温度场的影响[J]. 中国激光, 2017, 44(4): 0402002. Wang Qiang, Jiao Junke, Zan Shaoping, Zhang Wenwu. Effect of Thermal Contact Conductanceon Temperature Field of CFRTP/Stainless Steel Laser Direct Joining[J]. Chinese Journal of Lasers, 2017, 44(4): 0402002.