Design of Lightweight CFRP Automotive Part as an Alternative for Steel Part by Thickness and Lay-Up Optimization

Lee, Jeong Min; Min, Byeong-Jin; Park, Joon-Hong; Kim, Dong Hwan; Kim, Byung-Min; Ko, Dae-Cheol

doi:10.3390/ma12142309

Cited by 45 publications

(24 citation statements)

References 23 publications

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“…The system compliance has been calculated in a previous test, and the value obtained was C sist = 1/24,000 mm/N. The determination of the crack length is performed by means of an iterative process using MATLAB software (R2020b), seeking for the value of a that fulfils that theoretical compliance given in Equation 2is equal to the experimental compliance of the specimen given in Equation (10). Thereupon, the crack length is determined at each point of the test where load and displacement are measured, without any optical device [49].…”

Section: Test Methodologymentioning

confidence: 99%

“…However, the increase of the rotor size has led to the consideration of carbon fiber, at least in some parts of the blade [ 4 , 5 , 6 , 7 ]. Due to their specific features, carbon fiber reinforced polymers have been broadly investigated in many different sectors, such as building structures [ 8 , 9 ], automotive sector [ 10 , 11 , 12 ] or energy harvesting applications [ 13 , 14 , 15 ], among others. Carbon fiber has lower density and higher specific strength and stiffness.…”

Section: Introductionmentioning

confidence: 99%

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Delamination Fracture Behavior of Unidirectional Carbon Reinforced Composites Applied to Wind Turbine Blades

et al. 2021

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One of the materials that is used widely for wind turbine blade manufacturing are fiber-reinforced composites. Although glass fiber reinforcement is the most used in wind turbine blades, the use of carbon fiber allows larger blades to be manufactured due to their better mechanical characteristics. Some turbine manufacturers are using carbon fiber in the most critical parts of the blade design. The larger rotors are exposed to complex loading conditions in service. One of the most relevant structures on a wind turbine blade is the spar cap. It is usually manufactured by means of unidirectional laminates, and one of its major failures is the delamination. The determination of material features that influence delamination initiation and advance by appropriate testing is a fundamental topic for the study of composite delamination. The fracture behavior is studied across coupons of carbon fiber reinforcement epoxy laminates. Fifteen different test conditions have been analyzed. Fracture surfaces for different mode ratios have been explored using optical microscope and scanning electron microscope. Experimental results shown in the paper for critical fracture parameters agree with the theoretically expected values. Therefore, this experimental procedure is suitable for wind turbine blade material characterizing at the initial coupon-scale research level.

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Section: Test Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Delamination Fracture Behavior of Unidirectional Carbon Reinforced Composites Applied to Wind Turbine Blades

et al. 2021

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“…Fiber-reinforced polymer (FRP) composites have become the most promising structural materials of present century. Their high specific strength and high specific stiffness have made them find applications in variable engineering fields, including aerospace, transportation, civil facilities, and maritime facilities [1][2][3][4][5]. Especially in the field of UAVs, the excellent mechanical properties have great significance to the lightweight structure design [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Acid Aging of CFRP Composite Materials for Solar UAV Structure

Shen

Liu

et al. 2021

International Journal of Aerospace Engineering

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The purpose of this investigation is to study the performance degradation mechanism of CRRP composite materials used in the structure of a solar UAV under acid rain environment and to provide references for the structural design of the solar UAV. An aging test was designed according to the actual working conditions of the solar unmanned aerial vehicle and was carried out by continuously immersing the composite material in both deionized water and an acidic solution with a pH of 2.0 at 60°C. The mechanical behavior of the composites was studied through a three-point bending test. The results showed that after 120 days of aging test, the composite material exhibits different characteristics in the two conditions. The composite material under the hygrothermal conditions finally reached the equilibrium moisture absorption content of 1.07%, and the flexural strength decreased by 8.77%. The composite material under acidic conditions deviated from the Fick behavior in the final stage of the test, and the final moisture content was 2.88%, and the bending strength decreased by 26.43%. Several typical empirical models were analyzed, and a hyperbolic tangent function empirical model with moisture content as the main variable was used to predict the CFRP flexural strength degradation process, and good results were obtained. The effect of aging conditions on the microstructure of composite materials was observed by SEM, and the aging mechanism of composite materials was analyzed. The corrosion of the polymer matrix and the debonding of the fiber/matrix interface are the root causes of the performance degradation of composite materials.

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“…The optimal design parameters were calculated by the genetic algorithm (GA). Similarly, Kim [ 52 ] and Lee [ 53 ] studied the optimized design of CFRP product using structural analysis combined with GA, considering the effects of thickness and lay‐up angle. Sun [ 54 ] and Javier [ 55 ] studied the design optimization of hybrid energy absorbers by FEA and parametric analysis.…”

Section: Introductionmentioning

confidence: 99%

Structure design and multiobjective optimization of CFRP/aluminum hybrid crash box

Zha

Dong

et al. 2020

Polymer Composites

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To improve the crashworthiness and reduce vehicle weight, a crash box made of carbon fiber reinforced plastics (CFRP)/aluminum (Al) hybrid materials was introduced in the paper. Quasistatic axial compression tests and numerical simulations were conducted for pure Al tubes and CFRP/Al hybrid tubes. The simulation models were validated and were further employed to investigate the effects of geometry, aluminum tube thickness, fiber wrapping angle and CFRP layers on the crashworthiness of the hybrid crash box under axial loading and 30 oblique collision. The multiobjectives were taken to obtain the optimal geometrical dimensions, aluminum tube thickness, wrapping angle, and the number of layers. The crashworthiness of the optimal CFRP/Al hybrid crash box was compared with that of original aluminum crash box. It was found that the mass of the crash box was reduced by 35.21%, while the specific energy absorption (SEA) and mean crushing force (F mean) were increased by more than 18% and 46%, respectively. The paper was aimed to provide some references for the design and optimization of composite crash box.

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Design of Lightweight CFRP Automotive Part as an Alternative for Steel Part by Thickness and Lay-Up Optimization

Cited by 45 publications

References 23 publications

Delamination Fracture Behavior of Unidirectional Carbon Reinforced Composites Applied to Wind Turbine Blades

Delamination Fracture Behavior of Unidirectional Carbon Reinforced Composites Applied to Wind Turbine Blades

Acid Aging of CFRP Composite Materials for Solar UAV Structure

Structure design and multiobjective optimization of CFRP/aluminum hybrid crash box

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