Abstract
This article deals with the lifetime of laminated materials produced by different production technologies (hand lamination technology, vacuum bagging technology and prepreg technology with curing in the oven) during cyclic repeated bending stress. Like tested materials composite systems were chosen composite systems with epoxy matrix and carbon reinforcement (Kordcarbon CC200T, epoxy resin with trade name L285) and second composite epoxy system with glass reinforcement (Quadra-axial glass fabric, named Saertex Q-E-820, epoxy resin Biresin CR 82 and third prepreg systems (unidirectional prepreg, trade name Deltapreg VV430U-DT860W-39% and prepreg system with glass fabric VV320P_DT806R-37%). Fatigue tests were performed by cyclic bending loads during a three-point arrangement on a universal servo-hydraulic testing machine INSTRON 8871. Experimentally the number of cycles fracture of the material was determined at 90 % and 80 % of the maximum breaking load.
Highlights
Increasingly, there is a need to know the behaviour of composite materials in fatigue cyclic loading in the design and development of new products
Glass prepreg specimens withstood relatively high cycles compared to 4 axial glass fabric specimens
The results of the experiments show that the carbon composite Kordcarbon CC200T achieves the highest durability
Summary
There is a need to know the behaviour of composite materials in fatigue cyclic loading in the design and development of new products. Carbon composites with epoxy resin are very suitable material for cyclic and variable stresses because they resist well. A comparison of the fatigue behaviour of carbon composites with other materials is shown in figure 1 [2,3]. The carbon fabric used for the production of test specimens has the designation CC200 T - 100 KORDCARBON, weight 200g / m2, twill weave, see figure 4. HAVEL L285 epoxy resin was used as a matrix together with H285 hardener in a 100:40 mixing ratio This low viscosity epoxy system is designed to produce high static and dynamic load parts. It is suitable for hand lamination in combination with glass, carbon or aramid fibers. Test specimens for static and fatigue bending tests were machined from prepared cured plates to 20 mm ×100 mm
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