مؤسسة الشرق الأوسط للنشر العلمي
عادةً ما يتم الرد في غضون خمس دقائق
Carbon fiber reinforced polymer (CFRP) composites have been extensively utilized in engineering applications for a considerable period, owing to their corrosion resistance, high stiffness, and exceptional lightness. Nonetheless, the loads that materials, particularly composites, encounter render them susceptible to collapse or the accumulation of damage, ultimately resulting in complete failure at some stage, regardless of whether these loads are fixed or variable. Consequently, enhancing the internal structure design of carbon fiber-reinforced polymer composites to suit various applications is critically important. This study investigates the failure behavior of CFRP laminates under static loads for one specimen and variable loads using a regular low-cycle fatigue (LCF) procedure for another, as well as a low-cycle (varying) fatigue procedure from low to high stresses and vice versa, for two other specimens. Under the same load limits for all tests without reaching the stage of complete failure of the specimen. The experimental procedure involved the use of a specially designed apparatus to apply loads through internal air pressure to the center of the panel once it was securely fixed in place. The observed deformation of the specimen was tracked in line with its maximum deflection measurements. The experimental results were compared to the theoretical maximum deflection under static loading. To ensure that the experimental and theoretical results are consistent to the extent that allows periodic fatigue tests according to correct measurements and building on them. The study showed that CFRP sheets are exposed to minimal deformation under static loads, where the maximum deflection reached (5.94 mm) compared to the uniform low-cycle fatigue loads, which recorded a higher deformation at a deflection of (6.16 mm). In contrast, the varying low-cycle fatigue loads were more harmful to the internal structure of (CFRP) sheets until the maximum deflection was reached and at the same limits (7.91 mm) in low to high pressure. In comparison, it came (8.51 mm) at high to low pressure, indicating a large deformation of the sample when it is under varying pressures.