帘线增强橡胶基复合材料双搭接层合板的拉伸性能

Tensile property of cord reinforced rubber composites laminate double lap joint

针对帘线增强橡胶复合材料结构连接形式,设计制备了不同搭接工艺参数的结构测试试样,采用二维数字图像技术,研究了其动静态拉伸性能。测试结果表明:随应变速率增加,帘线增强橡胶复合材料刚度、抗拉强度增大,而断裂伸长率基本不变;与无搭接试样比较,搭接试样抗拉强度均降低近50%;随搭接宽度增加,断裂伸长率逐渐减小,搭接宽度65 mm的试样相比无搭接试样断裂伸长率减小24%;阶段Ⅲ弹性模量相比阶段Ⅱ弹性模量均有明显增大,无搭接试样增大3倍,搭接试样增大1倍左右,且随着应变速率增加弹性模量的增幅减小。

According to the structural connection form of cord reinforced rubber composite,structural test samples with different lapping process parameters were designed and prepared.The dynamic and static tensile properties were studied by using two-dimensional digital image technology.The test results were as follows:The stiffness and tensile strength of double lap composites joints increased as the strain rate increasing,while the elongation at break unchanged.Compared with the no-lap samples,the tensile strength of the double lap composites sample was reduced by nearly 50%,and with the increase of the lap width,the elongation at break gradually decreased.The samples with lap width of 65 mm decreased by 24%compared with the no-lap ones.Compared with the elastic modulus of stage Ⅱ,the elastic modulus of stage Ⅲ increased significantly,that of the no-lap samples increased by 3 times,that of the lap samples were doubled,and the amplification of elastic modulus decreased with the increase of strain rate.