3D打印铝合金力学性能的非线性超声检测

为了研究非线性超声检测技术评估材料抗拉强度的可行性,对不同成型角度下的3D打印铝合金材料进行非线性超声检测和力学拉伸试验。结果表明材料的抗拉强度、微观缺陷比率和超声非线性系数三者之间有很强的相关性。随着材料微观缺陷比率增大,超声非线性系数也随之增大,而抗拉强度呈现变小的趋势,因此超声非线性系数可以评价材料的强度。此外,对不同成型角度下的3D打印铝合金试件进行疲劳试验,发现疲劳加载后试件的超声非线性系数随着微裂纹萌生而增大。因此,非线性超声检测技术可用于3D打印铝合金材料力学性能的评估和微裂纹的检测。

Nonlinear ultrasonic test for mechanical properties of 3D printing aluminum alloy

In order to study the feasibility of using nonlinear ultrasonic testing technology to evaluate the tensile strength of materials, nonlinear ultrasonic testing and mechanical tensile tests were carried out on 3D printing aluminum alloy materials with different forming angles. The results show that there is a strong correlation between the tensile strength, the microscopic defect ratio and the acoustic nonlinearity parameter of the material. With the increase of the microscopic defect ratio of the material, the acoustic nonlinearity parameter increases, while the tensile strength tends to decrease. Thus, the acoustic nonlinearity parameter can be used to evaluate the strength of the material. In addition, fatigue tests were carried out on 3D printing aluminum alloy specimens with different forming angles. The findings reveal that the acoustic nonlinearity parameter of the specimens after fatigue loading increases with the initiation of microcracks. Therefore, nonlinear ultrasonic testing technology can be used for mechanical performance evaluation and microcrack detection of 3D printing aluminum alloy materials.