Mechanical Properties Testing And Analysis Of T300/AG80 Laminated Plate

Carbon fiber/epoxy composite materials are widely used as preferred structural materials for aerospace engineering, aviation, sports, leisure and industrial areas because of its excellent mechanical properties such as high strength, high modulus, light density, excellent thermal physical properties, chemical stability, and material properties can be designed. Studying the mechanical properties of carbon fiber composite, especially its high-temperature performance is of great significance for its use in extraordinary circumstances. Results of protective effect of composite properties to high power laser can be a reference for national defense. The material of this article is T300/AG80 composite plate which widely used in aerospace engineering. The main contents including:(1) Failure loads and elastic modulus of T300/AG80 composite longitudinal specimens and latitudinal specimens were tested. Deformations under different loads of test specimens at various temperatures were ascertained through non-contact method using remote camera and image recognition. Based on the deformation, elastic modules were obtained and the empirical formula of mechanical properties of the composite material structure at high temperature was acquired by regression analysis on experiment data. Retention rate of mechanical properties was calculated at various temperatures. The influence of temperature on material properties was analyzed, and then recommended a safe using temperature range of the composite structure.(2) The time-to-failure of the T300/AG80 composite laminated specimens in pre-stress and radiated by Nd: YAG laser simultaneously was tested. The influence of pre-stress and laser power density on the time-to-failure of specimens was analyzed. The relational expressions between the time-to-failure of specimens and pre-stresses as well as with laser power densities were acquired through fitting experiment data. The results obtained by fitting experimental data provide reference formulas for life prediction of composite structure under tensile or compressive preload and laser irradiation.(3) A finite element model was established to study the stress distribution of the T300/AG80 composite laminate layers loaded in tensile or compressive force, and the influence of lamination angles on the mechanical properties of composite plate was analyzed.