Tensile and Compress Property of Composite Laminate in Hygrothermal Environment
Liang XU1,*(), Bing-qiang FEI1, Shao-hua MA1, Li HUI1,2, Guo-dong HUANG1
1 School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang 110136, China 2 Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China
The tensile and compressive tests on woven carbon fiber epoxy resin composite specimens in different hygrothermal environments were carried out. The moisture absorption, tensile and compressive properties, fracture morphology and dynamic mechanical properties were analyzed. The influence of hygrothermal environments on tensile and compressive properties was investigated. The results show that the absorption process of carbon fiber epoxy composites satisfies Fick's law, and its saturated moisture absorption rate is about 0.86%. After moisture absorption, the surface of specimens becomes smooth, the phenomenon of few fibers pull-out and resin damage occurs, but no chemical reaction and no new substances is generated. After moisture absorption at 130℃, the retention rate of tensile properties is 96%, but the retention rate of compression properties is only 69%. The glass transition temperature of composite laminates after moisture absorption decreases by 33℃ compared with that in dry state.
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