About this Abstract |
Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Presentation Title |
Prediction of Long-Term Deformation Caused by Process-Induced Residual Stresses in Cross-Ply Laminates |
Author(s) |
Kazuki Ryuzono, Sera Koo, Yamato Hoshikawa, Yoshiaki Kawagoe, Tomonaga Okabe |
On-Site Speaker (Planned) |
Kazuki Ryuzono |
Abstract Scope |
Carbon-fiber-reinforced plastic (CFRP) laminates exhibit residual stresses and deformation depending on the manufacturing process, and the residual stresses drive long-term deformation due to viscoelastic effect of CFRP. The prediction of the deformations is the key to optimize the manufacturing process because they increase the cost of manufacturing composite products. Previous studies have successfully predicted the process-induced deformation of CFRP laminates by finite element analysis (FEA) considering curing and thermal shrinkage. Conversely, there are few studies in the long-term deformation because of the complicated experiments to evaluate the viscoelastic effect on the warping deformation. Therefore, this study measured both the process-induced and long-term deformations and developed a numerical method to predict them. In the experiments, thin cross-ply laminates were molded using autoclave, and the warpage of them was measured with three-dimensional blue light scanner. The numerical method consists of two FEAs: one predicts the process-induced deformation, and the other simulates the subsequent time-dependent deformation derived from the predicted residual stresses. For the analysis, an anisotropic viscoelastic constitutive law was introduced to three-dimensional FEA considering geometric nonlinearities. The relaxation modulus was designed by generalized Maxwell model, and the viscoelastic properties were obtained from dynamic mechanical analysis for unidirectional CFRP laminates. The experimental results exhibited the warping deformation induced by the residual stresses, and the out-of-plane deformation of the warpage became smaller with time. The numerical results agreed well with the experimental results in terms of maximum deformation, which verifies the feasibility of the proposed method. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |