利用红外热像法测定AZ31B镁合金应力集中系数

Stress Concentration Coefficient of AZ31B Alloy Measured by Infrared Thermography

利用红外热像法测量AZ31B镁合金双V型缺口试样的应力集中系数,并与Abaqus模拟结果进行对比。结果表明,红外热像法得到的双V型缺口试样的应力集中系数为2.14,而利用有限元模拟得到的应力集中系数为2.20,较红外热像法的误差为2.8%。利用红外热像法测得的应力集中处的温度下降值为-0.36 K;而有限元模拟在不考虑热传导时的结果为-0.37 K,考虑热传导的结果为-0.20 K,与红外热像法所得结果的误差分别为2.8%和44.4%。利用红外热像法能快速且精确的预测AZ31B镁合金应力构件的集中系数。

The infrared thermography method was used to measure the stress concentration coefficient of AZ3 I B alloy double V notched specimen, and the results were compared by Abaqus simulation. The results show that： the stress concentration coefficient obtained by infrared thermography method is 2.14, and the other results obtained by FEM simulation is 2.20. Compared this results with the result obtained by infrared thermography method, the errors are 2.8%. The temperature declines in the region of stress concentration coefficient measured by infrared thermography method is -0.36 K; and without considering the thermal conductivity, the result of FEM is -0.37 K, taking the thermal conductivity into consideration, the result is -0.20 K, and the errors compared with infrared thermography method are respectively 2.8% and 44.4%. The stress concentration coefficient of AZ31B alloy can be predicted rapidly and exactly by infrared thermography.