Study on Tensile Properties of CFRP Plates under Elevated Temperature Exposure

Abstract

Elevated temperature exposure has a negative effect on the performance of the matrix resin in Carbon Fiber Reinforced Plastics (CFRP) plates, whereas limited quantitative research focuses on the deteriorations. Therefore, 30 CFRP specimens were designed and tested under elevated temperatures (10, 30, 50, 70, and 90 °C) to explore the degradations in tensile properties. The effect of temperature on the failure mode, stress-strain curve, tensile strength, elastic modulus and elongation of CFRP plates were investigated. The results showed that elevated temperature exposure significantly changed the failure characteristics. When the exposed temperature increased from 10 °C to 90 °C, the failure mode changed from the global factures in the whole CFRP plate to the successive fractures in carbon fibers. Moreover, with temperatures increasing, tensile strength and elongation of CFRP plates decreases gradually while the elastic modulus shows negligible change. Finally, the results of One-Way Analysis of Variance (ANOVA) show that the degradation of the tensile strength of CFRP plates was due to the impact of elevated temperature exposure, rather than the test error.

Temperature Effects on the Mechanical Properties of Unidirectional Carbon Fiber Reinforced Plastic in the Longitudinal and Transversal Directions

“…A similar change in the typical fracture of CFRP specimens during longitudinal tensile tests with increasing temperature was observed in works [7,8].…”

“…In [6], the effect of elevated temperatures on the mechanical characteristics of polymer composites was analyzed from the known literature sources, and it was shown that at temperatures below the glass transition temperature T G , there is a slight degradation of their strength, but when reaching and exceeding T G temperature, the strength and rigidity fall sharply. Furthermore, as the temperature increases, accompanied by a sharp change in the properties of the plastic and its ablation, the typical character of fracture of unidirectional CFRPs changes from catastrophic explosive at room temperature to the gradually scattered fracture of carbon fibers [7,8].…”

“…Therefore, the elastic modulus value in the longitudinal direction coincides well with the experimentally obtained value, whereas the estimation of the ultimate strength is much higher than that obtained in the tests. In [7,8,13], the ultimate strength values for a number of unidirectional CFRPs under longitudinal tension are given, which are lower than the strength of the corresponding carbon fibers. This may be due to many factors, including some assumptions made by the manufacturer when determining the initial strength of the fiber bundles, deviation of their orientation relative to the load axis in the multilayer structure of the specimen, non-uniform distribution of the initial tension of separate fibers in the carbon fiber bundles during manufacturing of the composite.…”

Fatigue performance and life prediction of CFRP plate in the RC bridge roof reinforcement

“…Carbon Fiber-Reinforced Polymer (CFRP) with great material performance has been widely applied in various aspects after its invention, and its mechanical properties have also been extensively studied (Kalavagunta et al, 2014;Barile et al, 2019;Zhang et al, 2019;Yang et al, 2019;Yuan et al, 2019;Saleem et al, 2019). As an effective alternative to traditional materials for strengthening and repairing damaged structures, CFRP-reinforced bridge structure has been extensively investigated (Lu et al, 2018;Peng et al, 2014;Hosseini et al, 2019;Shukri et al, 2018;Mashrei et al, 2019).…”

Analysis of the Machinability of Carbon Fiber Composite Materials in Function of Tool Wear and Cutting Parameters Using the Artificial Neural Network Approach

“…Carbon fiber reinforced polymer composites (CFRPs) are widely used in the industry due to their excellent mechanical properties and good corrosive resistance [1,2]. In particular, they are commonly used in aeronautical and aerospace industries in the manufacturing of aircrafts, ships, space shuttles, and more.…”