THREE-DIMENSIONAL NUMERICAL SIMULATION OF RESIDUAL STRESS FOR SCARF REPAIRED COMPOSITES DURING CURING PROCESS

Abstract

Abstract: Based on the thermochemical and residual stress theory, a three-dimensional finite element model of composite was developed during the curing process by coupled thermos-mechanical method. The accuracy of the simulation model is verified by comparing with the literature results of C-shape part. Based on the model, modulus and residual stress variation of the scarf repaired AS4/3501 composite laminate were calculated during the curing process. The results indicate that the modulus of resin and composite perpendicular to the fiber is very small before gelation point, residual stress existes in the direction of fiber. After gelation point, modulus increases to constant valve with the curing time quickly, and residual stress develops gradually, then increases quickly during the cooldown phase.

Key words: composite, scarf repair, residual stress, numerical simulation

CLC Number:

TB332

PANG Jie, LIU Guo-chun. THREE-DIMENSIONAL NUMERICAL SIMULATION OF RESIDUAL STRESS FOR SCARF REPAIRED COMPOSITES DURING CURING PROCESS[J]. Fiber Reinforced Plastics/Composites, 2016, 0(8): 22-26.

References

[1] 杜善义, 关志东. 我国大型客机先进复合材料技术应对策略思考[J]. 复合材料学报, 2008, 25(1): 1-10.
[2] Hahn H, Pagano N. Curing stresses in composite laminates[J]. Journal of Composite Materials, 1975, 9(1): 91-106.
[3] Bogetti TA, Gillespie JW. Two-dimensional cure simulation of thick thermosetting composites[J]. Journal of Composite Materials, 1991, 25(3): 239-273.
[4] Harper B, Weitsman Y. On the effects of environmental conditioning on residual stresses in composite laminates[J]. International Journal of Solids and Structures, 1985, 21(8): 907-926.
[5] Prasatya R, McKenna GB, Simon SL. A viscoelastic model for predicting isotropic residual stresses in thermosetting materials: effects of processing parameters[J]. Journal of Composite Materials, 2001, 35(10): 826-849.
[6] Chen Y, Xia ZH, Ellyin F. Evolution of residual stresses induced during curing processing using a viscoelastic micromechanical model[J]. Journal of Composite Materials, 2001, 35(6): 522-542.
[7] 郭章新, 韩小平, 李金强, 等. 纤维缠绕复合材料固化过程残余应力/应变的三维数值模拟[J]. 复合材料学报, 2014, 31(4): 1006-1012.
[8] 王晓霞. 热固性树脂基复合材料的固化变形数值模拟[D]. 济南:山东大学, 2012.
[9] 胡照会, 王荣国, 赫晓东, 等. 复合材料层板固化全过程残余应变/应力的数值模拟[J]. 复合材料学报, 2008, 28(2): 55-59.
[10] 张纪奎, 郦正能, 关志东, 等. 固化度和固化收缩对非对称复合材料层合板固化变形的影响[J]. 复合材料学报, 2007, 24(2): 120-124.
[11] 戴棣, 乔新. 粘弹性基体复合材料层合板的固化残余应力和曲率变化[J]. 复合材料学报, 2000, 16(3): 38-41.
[12] Cheung A, Yu Y, Pochiraju K. Three-dimensional finite element simulation of curing of polymer composites[J]. Finite Elements in Analysis and Design, 2004, 40(8): 895-912.
[13] Kim J, Moon TJ, Howell JR. Cure kinetic model, heat of reaction, and glass transition temperature of AS4/3501-6 graphite-Epoxy prepregs[J]. Journal of Composite Materials, 2002, 36(21): 2479-2498.
[14] Bogetti TA, Gillespie JW. Process-induced stress and deformation in thick-section thermoset composite laminates[J]. Journal of Composite Materials, 1992, 26(5): 626-660.
[15] Zhu Q, Geubelle P, Li M, et al. Dimensional accuracy of thermoset composites: simulation of process-induced residual stresses[J]. Journal of Composite Materials, 2001, 35(24): 2171-2205.