Abstract
In the current research, the effect of cyclic temperature variation on the mechanical and thermal properties of woven carbon-fiber-reinforced polymer (CFRP) composites was investigated. To this, carbon fiber textiles in twill 2/2 pattern were used as reinforced phase in epoxy, and CFRPs were fabricated by vacuum-assisted resin-infusion molding (VARIM) method. Thermal cycling process was carried out between −40 and +120 °C for 20, 40, 60 and 80 cycles, in order to evaluate the effect of thermal cycling on mechanical and thermal properties of CFRP specimens. In this regard, tensile, bending and short beam shear (SBS) experiments were carried out, to obtain modulus of elasticity, tensile strength, flexural modulus, flexural strength and inter-laminar shear strength (ILSS) at room temperature (RT), and then thermal treated composites were compared. A dynamic mechanical analysis (DMA) test was carried out to obtain thermal properties, and viscoelastic properties, such as storage modulus (E’), loss modulus (E”) and loss factors (tan δ), were evaluated. It was observed that the characteristics of composites were affected by thermal cycling due to post-curing at a high temperature. This process worked to crosslink and improve the composite behavior or degrade it due to the different coefficients of thermal expansion (CTEs) of composite components. The response of composites to the thermal cycling process was determined by the interaction of these phenomena. Based on SEM observations, the delamination, fiber pull-out and bundle breakage were the dominant fracture modes in tensile-tested specimens.
Highlights
Carbon-fiber-reinforced composites are widely used in aeronautic applications, such as spacecraft structures, because of their superior mechanical properties, such as specific modulus of elasticity, high mechanical properties and low density of carbon fibers [1,2].These components are exposed to various environmental conditions, such as cyclic thermal variation, and are degraded over time
The main objective of this research was to investigate the effect of cyclic temperature variation on mechanical and thermal properties of woven carbon-fiber-reinforced polymer (CFRP)
In the thermal-cycling process, one cycle was determined as a sequence which was started from room temperature and increased to +120 ◦C, decreased to −40 ◦C and returned toMraotoemriatlemperature
Summary
Carbon-fiber-reinforced composites are widely used in aeronautic applications, such as spacecraft structures, because of their superior mechanical properties, such as specific modulus of elasticity, high mechanical properties and low density of carbon fibers [1,2]. Russell-Stevens et al [13] evaluated the effect of thermal cycling on the properties of carbon-fiber-reinforced magnesium composites The results of their studies showed that there was no change in the bending strength of these composites during thermal cycling. The effect of thermal cycling on mechanical and thermal properties of woven carbon-fiber-reinforced epoxy composites was investigated. These types of composites are used in aeronautical applications in which the instruments are exposed to continuously changing of temperature. The main objective of this research was to investigate the effect of cyclic temperature variation on mechanical and thermal properties of woven carbon-fiber-reinforced polymer (CFRP). UUsseedd CCFFRRPP tteexxttiilleess wweerreeiinnaa22//22 ttwwiillll ppaatttteerrnn aanndd wweerreeppuurrcchhaasseeddffrroommSSppinintteekkss TTeexxttiilleeCCoo. DDeenniizzllii,, TTuurrkkeeyy.
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