The investigation of composite material envelope curing deformation affected by layout structure and cementing

doi:10.19936/j.cnki.2096-8000.20251028.016

Abstract

Abstract: The design of stringer arrangement structure not only affects the mechanical properties of aircraft envelope, but also affects the curing deformation during forming. Therefore, it is very important to study the influence of stringer arrangement structure and cementing effect on aircraft envelope forming. In this paper, curing degree,glass transition temperature, internal stress, and strain changing over time have been analyzed based on simulation, more over comparing the influence of hat section stringer layout structure and cementing effect on residual internal stress and curing deformation of composite skin and verified by experiment. The results indicate that, the stress increases rapidly as composite material envelope cured. It will exceed 49.1 MPa after demoding, and further extend to 51.7 MPa while the cementing effect is taken into account. The curing deformation along the length and width change slightly, range from 0.19~0.31 mm, primarily influenced by cure shrinkage. However, the warping deformation of the envelope is influenced by the combined effect of mold bonding and stringer cementing, and the stringer cementing having a more significant impact. As the cementing area decreases, the warping deformation decreases from 2.50 mm to 1.19 mm, and the deformation distribution becomes more uniform. By contrast, the middle stringer has a greater impact on warping deformation and more pronounced stress concentration than outer stringer.

Key words: composite material envelope, curing deformation, hat section stringer, finite element analysis

CLC Number:

TB332

GAO Xiang, HU Jiandong, XIE Xiaolin, LI Wenbo, WANG Ziqiang, AN Lin. The investigation of composite material envelope curing deformation affected by layout structure and cementing[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(10): 105-113.

References

[1] 杨龙英, 刘志杰, 刘阳阳. RFI整体成型复合材料帽型加筋壁板工艺设计及验证[J]. 航空制造技术, 2024, 67(14): 59-65.
[2] 边钰博. 碳纤维树脂基复合材料加筋壁板的力学性能研究[D]. 沈阳: 沈阳航空航天大学, 2022.
[3] 杨智勇, 左小彪, 范春浩, 等. 典型复合材料结构固化变形仿真预测与控制验证[J]. 宇航材料工艺, 2024, 54(2): 54-61.
[4] 郑伟涛, 饶华, 江开林, 等. 模具材料线胀系数对复合材料固化变形的影响研究[J]. 宇航材料工艺, 2024, 54(1): 43-48.
[5] 徐碧娥. 热压罐成型复合材料加筋壁板构件固化变形分析[J]. 航空发动机, 2022, 48(6): 71-76.
[6] 伍强, 赵凯, 刘鹏飞, 等. Z形纤维增强复合材料层压板固化变形分析[J]. 复合材料科学与工程, 2024(3): 84-90.
[7] 黄岗领, 盛毅, 陈志霞, 等. 复合材料构件固化变形预测及其工装型面补偿设计[J]. 纤维复合材料, 2023, 40(3): 87-93.
[8] 孙立帅, 刘闯, 李玉军, 等. 变厚度复合材料U型零件固化变形仿真预测与结构影响因素[J]. 复合材料学报, 2023, 40(1): 553-566.
[9] MIAO Y, LI J C, GONG Z H, et al. Study on the effect of cure cycle on the process induced deformation of cap shaped stiffened composite panels[J]. Applied Composite Materials, 2013, 20: 709-718.
[10] MA X Q, GU Y Z, MIN L I, et al. Investigation of carbon fiber composite stiffened skin with vacuum assisted resin infusion/prepreg co-curing process[J]. Science China Technological Sciences, 2014, 57(10): 1956-1966.
[11] 孙勇毅, 许英杰, 唐闻远, 等. 共固化成型复合材料加筋壁板的固化变形仿真技术研究[J]. 航空制造技术, 2022, 65(4): 107-114.
[12] 彭晓博, 程勇, 张龙, 等. 成型工艺对复合材料加筋蒙皮结构固化变形的影响[J]. 重庆理工大学学报(自然科学), 2023, 37(2): 142-150.
[13] RAMIS X, CADENATO A, MORANCHO J M, et al.Curing of a thermosetting powder coating by means of DMTA, TMA and DSC[J]. Polymer, 2003, 44(7): 2067-2079.
[14] LI X Y, WANG J H, LI S X, et al. Cure-induced temperature gradient in laminated composite plate: numerical simulation and experimental measurement[J]. Composite Structures, 2020, 253: 112822.
[15] JANKOVIC B. Kinetic and reactivity distribution behaviors during curing process of carbon/epoxy composite with thermoplastic interface coatings (T800/3900-2 prepreg) under the nonisothermal conditions[J]. Polymer Composites, 2018, 39(1): 201-220.
[16] KIM Y K, WHITE S R. Stress relaxation behavior of 350-6 epoxy resin during cure[J]. Polymer Engineering and Science,1996, 36(23): 2852-2862.
[17] ZHANG J, ZHANG M, LI S, et al. Residual stresses created during curing of a polymer matrix composite using a viscoelastic model[J]. Composites Science Technology, 2016, 130: 20-27.
[18] ZHU Q, GEUBELLE P H, 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.
[19] DING A, LI S, WANG J, et al. A new path-dependent constitutive model predicting cure-induced distortions in composite structures[J]. Composites Part A: Applied Science and Manufacturing, 2017, 95: 183-196.
[20] 丁安心. 热固性树脂基复合材料固化变形数值模拟和理论研究[D]. 武汉: 武汉理工大学, 2016.