Cure-induced residual stress buildup and distortions of CFRP laminates with stochastic thermo-chemical and viscoelastic models: Experimental verifications

Abstract

This paper proposes a stochastically coupled thermo-chemical and viscoelastic model and provides new insights from comparisons of the cure-induced residual stresses and distortions between various ply configurations. Six different laminate configurations were modeled to compare the material response during four manufacturing steps: in-mold curing, cool-down, post-curing, and final cool-down. While homogeneous plates with cross-ply configuration showed the same residual stresses at all the analyzed points, nonhomogeneous cross-ply laminates with random shrinkage showed variations in the stresses. It shows the importance of considering the randomness of the parameters when modeling composite materials’ manufacturing process.

Keywords:

• Curing kinetics
• laminate composite
• residual stress
• uncertainty
• viscoelasticity

Acknowledgments

The authors are grateful to Seoul National University (SNU) and the Institute of Engineering Research at Seoul National University for their supports.

Credit author statement

Sebastian Blanco: Formulation analysis, Investigation, Visualization, Original draft, Methodology; Hangil You: Data curation, Investigation, Validation, Visualization, Original draft, Review/Editing.

Tomas Webbe Kerekes: Experimental work, Review/Editing; Gun Jin Yun: Supervision, Funding acquisition, Validation, Original draft, Review/Editing.

Figure 14. YZ Distortion Comparison (Plate P6).

Additional information

Funding

This work was supported by Creative-Pioneering Researchers Program through Seoul National University (SNU) and the Institute of Engineering Research at Seoul National University.