Transactions of Nanjing University of Aeronautics & Astronautics
Micromechanical Study on Moisture Induced Tensile Strength Reduction of GFRP
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Abstract:
The main focus of this paper is to investigate the influence of hygrothermal aging on tensile strength of epoxy resin matrix composites. Firstly， tests of water absorption and moisture induced tensile strength degradation of glass fiber reinforced polymer （GFRP） are conducted. Results show that the moisture absorption behavior of the GFRP follows the Fick’s law， and its tensile strength retention decreases notably in the early hygrothermal aging stage and then gradually approaches a constant. Then， microscale longitudinal and transverse strength prediction models for unidirectional fiber reinforced composites are proposed. They are moisture concentration dependent and reflect the inherent probability of failures of fiber and matrix （or fiber/matrix interface）.The moisture diffusing analysis demostrates that the proposed models can predict degradation of tensile strength of epoxy resin matrix composites undergoing different hygrothermal durations. The proposed models are validated by the experiments of hygrothermal residual strength of the GFRP mentioned above.
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Project Supported:
This work was supported by the National Natural Science Foundation of China （No.11872205）， the State Key Laboratory Open Fund（No.MCMS-E-0221Y02）， and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
Clc Number:
TB332
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