Details

Autor(en) / Beteiligte

• Ye, Jia-Yu
• Zhang, Lu-Wen

Titel

Damage evolution of polymer-matrix multiphase composites under coupled moisture effects

Ist Teil von

• Computer methods in applied mechanics and engineering, 2022-01, Vol.388, p.114213, Article 114213

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The understanding of water penetration, diffusion, and swelling-related strength degradation is critical for assessing the durability of polymer-based composite materials exposed to marine environment. When moisture intrusion and various external loads are concurrently applied to polymer matrix materials, the multi-physical diffusion process, and the correlation with the complex cracking phenomenon is far from been discovered. To approach this uncertainty, we explored fully coupled moisture diffusion, stress redistribution, and damage evolution of composites for revealing complex failure patterns and rules. The novelty of this study could be described as follows. (i) A thermodynamically consistent moisture diffusion model is established to couple the moisture diffusion and viscoelastic response of the multiphase material. (ii) A two-constituent phase-field fracture model is developed to describe the hygroscopic swelling in the matrix and interfacial decohesion within a concise and universal continuum mechanics framework. (iii) We also propose a crack filter theory to characterize the fluctuation of moisture flux along with the evolution of regularized discontinuities. (iv) A static strength evaluation index is devised to calibrate the moisture resistance of fiber/polymer composites. Based on the strongly coupled scheme, the distinct damage profiles of dry and immersed composites were captured in line with experimental observations. For the first time, interactions of moisture diffusion with the complex cracking in composites are elucidated through simulations, thus providing new insights into the coupled damage mechanism of polymer composites and facilitating microstructure design to enhance its performance in ocean environments.