Dynamic Behavior of Carbon Fiber Reinforced Polymer (CFRP) Composites at Higher Strain Rates

The usage of polymer composites in various engineering fields has increased. However, the long-term service performance of such materials under aggressive conditions is still poorly understood, which limits the development of safe and economically effective designs. In this study, the aging of an epoxy resin and its carbon fiber-reinforced polymer (CFRP) composites upon immersion in water, acidic, and alkaline solutions was evaluated at different temperatures. The service life of the CFRP composites under various conditions could be predicted by the Arrhenius theory. The thermal and mechanical analysis results indicated that the CFRP composites were more vulnerable to HCl owing to the higher moisture absorption and diffusion of HCl into their cracks. The scanning electron microscopy results showed that the polymer matrix was damaged and degraded. Therefore, to allow long-term application, CFRP composites must be protected from acidic environments.

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Adhesion enhancement and damage protection for carbon fiber-reinforced polymer (CFRP) composites via silica particle coating

Composites Part A Applied Science and Manufacturing ◽

10.1016/j.compositesa.2018.02.042 ◽

2018 ◽

Vol 109 ◽

pp. 105-114 ◽

Cited By ~ 16

Author(s):

Kyungtae Kim ◽

Yong Chae Jung ◽

Seong Yun Kim ◽

B.J. Yang ◽

Jaewoo Kim

Keyword(s):

Carbon Fiber ◽

Silica Particle ◽

Fiber Reinforced Polymer ◽

Carbon Fiber Reinforced Polymer ◽

Fiber Reinforced ◽

Particle Coating ◽

Reinforced Polymer ◽

Cfrp Composites ◽

Carbon Fiber Reinforced ◽

Damage Protection

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Tensile properties of CFRP manufactured by resin transfer molding considering stacking sequences at various strain rates

Journal of Composite Materials ◽

10.1177/0021998318816441 ◽

2019 ◽

Vol 53 (14) ◽

pp. 2015-2030 ◽

Cited By ~ 1

Author(s):

Jesung Yoo ◽

Hoon Huh ◽

Jaeyoung Lim ◽

Taehwa Lee

Keyword(s):

Carbon Fiber ◽

Tensile Test ◽

Material Properties ◽

Fiber Reinforced Polymer ◽

Carbon Fiber Reinforced Polymer ◽

Strain Rates ◽

Fiber Reinforced ◽

Reinforced Polymer ◽

Carbon Fiber Reinforced ◽

Auto Body

This paper is concerned with the improvement of a tensile test method and the material properties of carbon fiber reinforced polymer manufactured by resin transfer molding considering stacking sequences at various strain rates for auto-body. Auto-body structure experiences the strain rates up to several hundreds per second during car crash. In order to apply the carbon fiber reinforced polymer panel into auto-body structures, it is critical to acquire the material properties of carbon fiber reinforced polymer at various strain rates considering stacking sequences. The tensile test method is improved for acceptable test results. Test specimens are modified for high-speed tensile tests of carbon fiber reinforced polymer in order to achieve designated strain rates and eliminate the effect from unfavorable conditions of inhomogeneity of deformation. Various types of grip tab materials are employed for acceptable failure modes. Tensile tests have been carried out with non-crimp fabric made by 50K high strength carbon fiber (NCF) and woven fabric made by a 2/2 twill pattern of 3K high strength carbon fiber (TWILL) with different stacking sequences of 0° and 90° unidirectional cases as well as [0°/90°] and [45°/−45°] symmetric cases. Digital image correlation method and force equilibrium grid method are adopted for strain and stress measurement of a carbon fiber reinforced polymer specimen during a tensile test. The material properties acquired indicate that the carbon fiber has little rate dependency, while the epoxy matrix has remarkable rate hardening at strain rates from 0.001 s−1 to 100 s−1.

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