Moisture Effects on Properties of Polymeric Composite Laminates with Different Void Content

摘要: Composite materials, especially carbon fiber reinforced polymers (CFRPs), have been broadly used due to their high specific strength and stiffness ratio compared metallic materials in the past few decades. CFRPs are widely utilized aerospace, civil infrastructure marine sectors under harsh environments. As a result, there exists strong demand observe mechanical behavior of composite presence moisture order avoid unpredictable effects. structures often cured an autoclave achieve required aerospace grade quality. However, curing large requires access autoclaves which is limited expensive. fabrication using out-of-autoclave prepreg will lead great amount savings manufacturing costs. In processing method, voids inside laminate has issue lack pressure during manufacturing. This study aims primarily absorption response samples containing different levels void. By changing vacuum level bag process, three unidirectional laminates at void manufactured. After immersing warm water 60˚C for about one year, maximum rate were monitored through experiments diffusion coefficients calculated all Fick’s law. Results show that coefficient, its can be correlated volume fraction. Moreover, sensibility moisturized environment investigated. The these studied four by performing dynamic analysis (DMA) interlaminar shear (ILSS) tests. Empirical results indicate most cases, strength, glass transition temperature, storage modulus decrease exposure with contents environment. Finally, finite element done change concentration thickness material.