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对国产F-12芳纶织物的剪切性能进行了研究,通过像框剪切试验和偏轴拉伸试验对其进行了测试,设计了相应的像框剪切夹具,利用数字图像相关方法(DIC)采集织物加载过程的变形场,获得了剪切载荷-剪切角度的变化曲线和剪切锁紧角,通过正则化处理对两种测试结果进行了对比分析;利用数值方法对织物剪切性能进行了计算,建立了一种非正交各向异性的杆-壳模型用于模拟织物剪切变形,编制了VUMAT子程序用于计算纱线方向的改变和应力更新,通过与试验结果的对比验证了计算模型的准确性。结果表明:织物的剪切行为具有明显的非线性特征,试样夹持部分的结构形式会对试验结果产生影响,未抽丝试样的剪切载荷要明显大于抽丝试样的剪切载荷,二者的剪切锁紧角近似相等;正则化处理后,相框剪切的剪切载荷大于偏轴拉伸的剪切载荷,而锁紧角小于偏轴拉伸的锁紧角;试验结果与仿真结果对比,仿真结果与试验结果吻合较好。
The shearing properties of domestic F-12 aramid fabric were studied. The shearing force of the aramid fabric F-12 was tested. The shearing force was measured by frame shear test and off-axis tensile test. Corresponding image frame shear jigs were designed and the digital image correlation method (DIC) The deformation field of the fabric loading process was collected to obtain the curve of the shear load-shear angle and the shear locking angle. The regularization treatment was used to compare the two test results. The numerical method was used to analyze the shear properties of the fabric A non-orthogonal rod-shell model was established to simulate the shear deformation of the fabric. The VUMAT subroutine was used to calculate the yarn direction change and stress update. By comparing with the test results Calculate the accuracy of the model. The results show that the shear behavior of the fabric is obviously non-linear. The structure of the sample holding part will affect the test results. The shear load of the non-drawn sample is obviously larger than the shear load , The shear locking angle of the two is approximately equal; after the regularization process, the shear load of the frame shearing is greater than the shearing load of the eccentric shaft stretching, and the locking angle is smaller than the locking angle of the eccentric shaft stretching; the test result Compared with the simulation results, the simulation results are in good agreement with the experimental results.