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以2026-T3511铝合金T形结构件的拉弯成形件为研究对象,首先采用线切割将T形结构件分割成两块具有T形截面的试样,然后基于轮廓法测试应力原理应用激光位移传感器分别测试两个分割截面的轮廓变化,进而将两个截面的测量值拟合平均后与有限元模型结合以计算该试样的初始残余应力,从而获得该T形结构件的横截面法向应力并分析其分布特征。研究结果表明,基于轮廓法测得的应力分布与有限元仿真结果分布规律相近:峰值压应力为60MPa,峰值拉应力为40MPa;轮廓法在航空结构件应力测试中能够准确地获得其他测试方法无法获得的横截面完整的应力分布。
In this paper, the T-shaped structure of 2026-T3511 aluminum alloy T-shaped structure as the object of the study, the first use of wire cutting T-shaped structure is divided into two sections with a T-shaped specimen, and then test the stress principle based on the contour method of laser displacement The sensors test the contour changes of the two split sections respectively, and then fit the measured values of the two sections to the finite element model to calculate the initial residual stress of the specimen to obtain the cross-sectional normal of the T-shaped structure Stress and analyze its distribution characteristics. The results show that the distribution of the stress distribution measured by the contour method and the finite element simulation results are similar: the peak compressive stress is 60MPa and the peak tensile stress is 40MPa. The contour method can accurately obtain other test methods in the stress test of aeronautic structures The resulting cross section is complete with stress distribution.