THE MECHANICAL PROPERTIES OF 3D BRAID COMPOSITE ADHESIVE JOINTS

Abstract

Abstract: In order to compare the efficiency of 3D braid composite repair of different type joints, the mechanical properties of step lap joint and nested joint subjected to tensile and bending load were examined experimentally by keeping the same joint length for all samples. Load-displacement curves were obtained for each type of joint by the test. Then, the strength of samples and the repair efficiency were acquired by comparing the strength of joints with intact specimens. Meanwhile, the tensile and bending damage evolution and profiles of specimens were analyzed and summarized. The test results show that the step lap joint has better mechanical properties. The repair efficiency of step lap joint under tensile load was 37.75%, and under bending load, the repair efficiency was 66.25%. The repair efficiency of nested joint under tensile load can reach 18.97%, and under bending load, the repair efficiency can reach 21.44%.

Key words: 3D braid composite, step lap, nested lap, adhesive joint, mechanical properties

CLC Number:

TB332

YANG Guan-xia, YANG Tao, DU Yu. THE MECHANICAL PROPERTIES OF 3D BRAID COMPOSITE ADHESIVE JOINTS[J]. Fiber Reinforced Plastics/Composites, 2018, 0(2): 66-69.

References

[1] 沈观林, 胡更开. 复合材料力学[M]. 北京: 清华大学出版社, 2006: 16-17.
[2] 王清远, 陶华. 复合材料修补件的强度和疲劳性能[J]. 材料工程, 2003(1): 21-23.
[3] 吕胜利, 程起有, 姚磊江,等. 损伤复合材料层板胶接修理的优化设计[J]. 机械强度, 2007, 29(4): 598-600.
[4] 郭霞, 关志东, 刘遂,等. 层压板双面挖补修理的拉伸性能研究及参数分析[J]. 复合材料学报, 2012, 29(1): 176-182.
[5] 苗学周, 李成, 铁瑛, 等. 补片形状和尺寸对复合材料胶接修补的影响[J]. 机械工程学报, 2014, 50(20): 63-69.
[6] Oplinger D W. Effects of adherend deflections in single lap joints[J]. International Journal of Solids & Structures, 1994, 31(18): 2565-2587.
[7] Alex B, Harman, Chun H.W. Improved design methods for scarf repairs to highly strained composite aircarft structure[J].Composite Structures, 2006, 75(1): 132-144.
[8] Kimiaeifar A, Lund E, Thomsen O T, et al. Asymptotic Sampling for reliability analysis of adhesive bonded stepped lap composite joints[J]. Engineering Structures, 2013, 49(49): 655-663.
[9] 乔玉, 周光明, 刘伟先, 等. 复合材料阶梯形胶接接头渐进损伤分析[J]. 南京航空航天大学学报, 2014, 46(4): 632-637.
[10] 汪源龙, 程小全, 侯卫国, 等. 挖补修理复合材料层合板拉伸性能研究[J]. 工程力学, 2012, 29(7): 328-334.
[11] 孟凡颢, 陈绍杰, 童小燕. 层压板修理设计中的参数选择问题[J]. 复合材料学报, 2001, 18(4): 123-127.
[12] 朱书华, 王跃全, 童明波. 复合材料层合板阶梯形挖补胶接修理渐进损伤分析[J]. 复合材料学报, 2012, 29(6):164-169.
[13] Pinto A M G, Campilho R D S G, Moura M F S F D, et al. Numerical evaluation of three-dimensional scarf repairs in carbon-epoxy structures[J].International Journal of Adhesion & Adhesives, 2010, 30(5): 329-337.[14] Akpinar S. The strength of the adhesively bonded step-lap joints for different step numbers[J]. Composites Part B Engineering, 2014, 67(67): 170-178.[15] 刘诗琪, 杨涛, 杜宇. 复合材料层合板挖补修复工艺研究[J]. 宇航材料工艺, 2017, 47(2): 71-76.
[16] Kumar S B, Sridhar I, Sivashanker S, et al. Tensile failure of adhesively bonded CFRP composite scarf joints[J]. Materials science & engineering. B, Solid-state materials for advanced technology, 2006, 132(1): 113-120.