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- 2017
复合材料织物层合板挖补修理软件实现与试验验证
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Abstract:
针对单向拉伸载荷作用下复合材料织物层合板胶接挖补修理结构，改进现有解析模型，建立适用于无附加层、附加1层和附加2层结构的阶梯型挖补修理结构和斜切型挖补修理结构的解析分析模型。给出求解算法，定义准确度用于评价数值计算精度，最终实现开发一套界面友好的复合材料胶接挖补修理设计与分析软件。该软件可以求解单向拉伸载荷作用下，复合材料胶接修理结构内部的剪应力场/剪应变场分布，评价搭接板受载情况，并预测结构失效载荷与失效模式。研究中采用T300/CYCOM-970织物作为母板与补片材料，METLBOND 1515-4M作为胶层材料，设计进行了一系列阶梯型及斜切型挖补修理验证试验。试件失效载荷与软件计算结果吻合良好，阶梯型最大相差5.7%，斜切型最大相差14.0%。该软件可以对复合材料织物层合板胶接挖补修理进行高效、准确的初步辅助设计与分析。 Existing analytical models were modified for the analysis of a scarf repaired composite fabric laminate under unidirectional tension. Both analytical models for stepped-scarf repair and tapered-scarf repair were built, including the structures without extra plies, with one extra ply and with two extra plies. The algorithms were developed and accuracy degree was defined, to assess the accuracy of numerical calculation, implementing a user-friendly software program for the design and analysis of composite scarf repair under tensile load. By running the software, the shear stress/strain distribution in the adhesive layer can be presented, the failure level of repair patch and the base laminate can be evaluated and the ultimate failure load and failure modes can be predicted. T300/CYCOM-970 was used as adherent while METLBOND 1515-4M was used as adhesive. A series of corresponding experiments were conducted for validation. The results calculated by this software show a good agreement with experiment outcomes that the relative errors for stepped-scarf repair are less than 5.7% and the relative errors for tapered-scarf repair are less than 14.0%. This software provides an efficient and accurate preliminary design and analysis tool for the scarf repair of composite fabric laminates. 国家自然科学基金（U1233202）
| [1] | THOPPUL S D, FINEGAN J, GIBSON R F. Mechanics of mechanically fastened joints in polymer-matrix composite structures—A review[J]. Composites Science and Technology, 2009, 69(3-4): 301-329. |
| [2] | 王奕首, 卿新林. 复合材料连接结构健康监测技术研究进展[J]. 复合材料学报, 2016, 33(1): 1-16. WANG Y S, QING X L. Progress on study of structural health monitoring technology for composite joints[J]. Acta Materiae Compositae Sinica, 2016, 33(1): 1-16 (in Chinese). |
| [3] | VOLKERSEN O. Rivet strength distribution in tensile-stressed rivet joints with constant butt strap cross section[J]. Luftfahrforschung, 1938, 15(1): 41-47. |
| [4] | GOLAND M, REISSNER E. The stresses in cemented joints[J]. Journal of Applied Mechanics, 1944, 11(1): A17-A27. |
| [5] | HART-SMITH L J. Adhesive-bonded single-lap joints, NASA-CR-112236[R]. Hampton, VA: Langley Research Center, 1973. |
| [6] | HART-SMITH L J. Non-classical adhesive-bonded joints in practical aerospace construction, NASA-CR-112236[R]. Hampton, VA: Langley Research Center, 1973. |
| [7] | YANG C, PANG S S. Stress-strain analysis of adhesive-bonded single-lap composite joints under cylindrical bending[J]. Composites Engineering, 1993, 3(11): 1051-1063. |
| [8] | YANG C, PANG S S. Stress-strain analysis of single-lap composite joints under tension[J]. Journal of Engineering Materials and Technology, 1996, 118(2): 247-255. |
| [9] | TONG L. An assessment of failure criteria to predict the strength of adhesively bonded composite double lap joints[J]. Journal of Reinforced Plastics & Composites, 1997, 16(8): 698-713. |
| [10] | ZHANG J, BEDNARCYK B A, COLLIER C S, et al. Analysis tools for adhesively bonded composite joints, part 2: Unified analytical theory[J]. AIAA Journal, 2006, 44(8): 1709-1719. |
| [11] | 刘斌, 徐绯, 季哲, 等. 改进的复合材料斜接结构胶层应力半解析法[J]. 复合材料学报, 2015, 32(2): 526-533. LIU B, XU F, JI Z, et al. Modified semi-analytical method for adhesive stress of scarf joints in composite structure[J]. Acta Materiae Compositae Sinica, 2015, 32(2): 526-533 (in Chinese). |
| [12] | AHN S H, SPRINGER G S. Repair of composite laminates Ⅱ: Models[J]. Journal of Composite Materials, 1998, 32(11): 1076-1114. |
| [13] | AHN S H, SPRINGER G S. Repair of composite laminates Ⅰ: Test results[J]. Journal of Composite Materials, 1998, 32(11): 1036-1074. |
| [14] | CHRISTENSEN R M, MCCOY J J. Mechanics of composite materials[M].Oxford: Pergamon Press, 1970: 229-230. |
| [15] | NOCEDAL J, WRIGHT S. Numerical optimization[M]. New York: Springer, 2006. |
| [16] | BANEA M D, SILVA L F M. Adhesively bonded joints in composite materials: An overview[J]. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials Design and Applications, 2009, 223(1): 1-18. |
| [17] | BAN C S, LEE Y H, CHOI J H, et al. Strength prediction of adhesive joints using the modified damage zone theory[J]. Composite Structures, 2008, 86(1-3): 96-100. |
