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对激光辐照复合材料层合板的应力应变进行模拟分析,获得了应力应变场分布及其变化规律。数值模拟首先获得试件各点随激光辐照时间变化的温度场,然后将温度场导入并分析了试件的热应力和热应变。结果显示:沿纤维方向应力由中心的最大拉应力过渡到距光斑边缘约5mm处的最大压应力后逐渐减小;垂直纤维方向应力在光斑内及其附近均是压应力;Mises应力在光斑中心处最大并随各位置到中心距离的增大而减小。热冲击使各点应力在辐照初期产生波动,光强越大,波动的时间点越早。为了验证数值分析模型,在激光辐照的复合材料层合板正面光斑周围粘贴应变片,用动态应变仪测试多点的应变并与数值结果进行对比,数值模拟应变与实测应变吻合较好,最大相对误差为18.4%。
The stress and strain of laser-irradiated composite laminates were simulated and the stress-strain field distribution and its variation were obtained. Firstly, the temperature field of each point of the specimen with the laser irradiation time is obtained. Then, the temperature field is introduced and the thermal stress and thermal strain of the specimen are analyzed. The results show that the stress decreases from the maximum tensile stress in the center to the maximum compressive stress about 5 mm away from the edge of the flake. The stress in the vertical fiber is compressive in and around the flare. At the maximum and with each location to the center distance increases and decreases. Thermal shock stress at each point in the initial fluctuations, the greater the light intensity, the earlier the time point of fluctuations. In order to validate the numerical analysis model, the strain gage was pasted around the front spot of the laser-irradiated composite laminates. The dynamic strain gauge was used to test the multi-point strain and compared with the numerical results. The numerical simulation strain was in good agreement with the measured strain. The maximum relative The error is 18.4%.