A review on optimization of composite structures Part I: Laminated composites

Impact resistance and damage tolerance of fiber reinforced composites: A review

Weight reduction of vehicle is very important because vehicle weight directly affects energy consumption. Studies researching lightweight vehicle manufacturing process that use polymers are reviewed in this paper. Approaches reducing the weights of vehicles using polymers most frequently involve replacing ferrous and non-ferrous metals with polymers and increasing the specific strengths and rigidities of polymers. Researches into polymers for use in lightweight vehicle are classified into high performance polymers, polymers for weight reduction, reinforced polymer composites, polymer sandwich panels, and polymer/metal hybrid systems. A diverse range of polymer materials can be used to make vehicle components and the manufacturing methods required to produce and work those materials vary greatly. Shaping processes must be chosen according to the materials being used and the product design. Replacement of metal products with polymer materials in current vehicles is limited. Large amounts of lightweight materials, such as polymers, will be greatly used to construct newly developed vehicles, including electric and electric/hybrid vehicles.

Research trends in polymer materials for use in lightweight vehicles

Composite materials/structures are advancing in product efficiency, cost-effectiveness and the development of superior specific properties. There are increasing demands in their applications to loa...

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Non-destructive testing and evaluation of composite materials/structures: A state-of-the-art review

Bending properties of thermoplastic prepregs used in aerospace are investigated at representative thermoforming temperatures. The influence of temperature is of principal importance because prepreg manufacturing is performed close to the resin’s melting point. A cantilever test performed in an environmental chamber is presented. Bending properties of PEEK-carbon satin and PPS-carbon satin prepregs are measured in a range of temperature including manufacturing temperatures. It is shown that the bending stiffness of the fore-mentioned thermoplastic prepregs are greatly influenced by temperature. The measured bending properties are used to simulate a thermoforming process. The impact of these properties on the simulation results is shown as well. Particularly, bending stiffness during forming determines the size of wrinkles that may appear. The sensitivity of wrinkle size with regards to the measured bending stiffness is analysed.

Analysis of thermoplastic prepreg bending stiffness during manufacturing and of its influence on wrinkling simulations

Nondestructive evaluation of hidden multi-delamination in a glass-fiber-reinforced plastic composite using terahertz spectroscopy

Substituting composites for the metallic structures has many advantages because of the higher specific stiffness and higher specific strength of the composite materials. In this paper, we designed an automotive composite lower arm using carbon-epoxy composite materials. To optimize the stacking sequence of the composite layer, we used a micro-genetic algorithm and investigated its effects on the performances of a lower arm, such as static/buckling load capability and stiffness. To maximize the buckling load capability, we performed the design optimization with the linear perturbation eigenvalue analysis, targeting a 50% weight reduction of conventional steel lower arm. We verified again the performance of the optimized composite lower arm using the static Riks analysis technique. Finally, we found that our composite lower arm had two times higher stiffness and buckling strength compared to the conventional steel lower arm while having 50% less weight.

Design optimization of a carbon fiber reinforced composite automotive lower arm

In this study, the strain rate dependent mechanical behavior of glass fiber reinforced thermoplastic polypropylene (GFPP) was investigated under the high strain rate. The split Hopkinson pressure bar (SHPB) apparatus was used in order to investigate the effects of strain rate based on the dynamic tensile, compressive and bias-extension shear behavior. The failure mode in fracture surface of each specimen was analyzed by using the scanning electron microscopy with respect to the strain rate. Additionally, the impact simulation of bumper beam was conducted to verify the measured strain rate dependent mechanical behavior of GFRP by using the commercial finite element analysis software LS-Dyna. Finally, it was found that the impact response of GFRP structures could be accurately predicted by using the strain rate dependent mechanical behavior compared to those of quasi-static properties.

Strain rate dependent mechanical behavior of glass fiber reinforced polypropylene composites and its effect on the performance of automotive bumper beam structure

Finite element analysis of a low-velocity impact test for glass fiber-reinforced polypropylene composites considering mixed-mode interlaminar fracture toughness

Do-Hyoung Kim

Papers

Nondestructive evaluation of hidden multi-delamination in a glass-fiber-reinforced plastic composite using terahertz spectroscopy

Design optimization of a carbon fiber reinforced composite automotive lower arm

Strain rate dependent mechanical behavior of glass fiber reinforced polypropylene composites and its effect on the performance of automotive bumper beam structure

Finite element analysis of a low-velocity impact test for glass fiber-reinforced polypropylene composites considering mixed-mode interlaminar fracture toughness

Three-dimensional progressive failure modeling of glass fiber reinforced thermoplastic composites for impact simulation