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基于双轴拉伸载荷下复合材料十字型试样的设计特点,对比分析了不同几何形状的十字型试样在不同厚度比和载荷比条件下中心测试区应力集中系数和承力系数的变化规律,并开展了不同载荷比的双轴拉伸实验进行验证。研究表明:十字型试样中心测试区系数与载荷大小无关,与试样几何形状、厚度比及载荷比有关;等宽加载臂宽度越小、厚度比越大,应力集中系数越小,载荷比不同,应力集中系数也不同;一般而言,中心测试区承力系数随厚度比增加而增大,x向承力系数βx随载荷比增加呈非线性增大,y向承力系数βy随载荷比增加呈线性减小;在双轴拉伸载荷条件下,形状D十字型试样在载荷比f=4/1时中心测试区y向应力分量为负值,表现为压应力状态。
Based on the design characteristics of cross-shaped specimens under biaxial tensile load, the variation of stress concentration factor and load-bearing coefficient of cross-shaped specimens with different geometric shapes under different thickness ratios and load ratios , And biaxial tensile tests with different loading ratios were carried out to verify. The results show that the coefficient of testing area in cruciform sample has nothing to do with the size of load, and is related to the geometry, thickness ratio and load ratio of sample. The smaller the width of uniform load arm, the larger the thickness ratio, the smaller the stress concentration coefficient, Different, stress concentration coefficient is also different; In general, the test area of the center bearing capacity coefficient increases with the thickness increases, the x-bearing force coefficient βx increases nonlinearly with the load ratio increases, y bearing capacity coefficient βy with load Linearly decreasing with increasing load. Under the condition of biaxial tensile load, the y-direction stress component of the center D-shaped cross-section specimen in the shape of D cross is negative when the load ratio f = 4/1, which shows the state of compressive stress.