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Ma Y.,Kyoto Institute of Technology | Sugahara T.,Kyoto Institute of Technology | Sugahara T.,Maruhachi Corporation | Yang Y.,Donghua University | And 2 more authors.
Composite Structures

Fiber reinforced composites (FRPs) with light weight did not exhibit the ductile failure mechanism which was related to metals. FRPs absorb lots of energy through progressive crushing modes by a combination of multi micro-crack, bending, delamination and friction. FRPs with half weight of traditional metals while absorb more than doubled energy. But FRPs were not used as energy absorption components in wide range, one of the most important reasons is their high manufacturing cost.In this study, carbon fiber and aramid fiber were chosen as reinforcements and common epoxy resin was chosen as matrix to manufacture five types of different structures and raw materials of carbon/aramid and carbon/carbon fiber reinforced composite tubes through high productive and low cost winding method. Then specimens were dealt under 100. °C condition for 100. h, 200. h and 400. h treatment respectively. After that, energy absorption ability was tested by quasi static compression tests and microscope observation of cross section was taken to analyze the mechanism of failure. By optimizing different hybrid method, ratio and reasonable geometry shape of composites, low cost and high energy absorption components whose specific energy absorption (Es) were near 100. kJ/kg could be manufactured to put to use on vehicles. © 2015 Elsevier Ltd. Source

Liu X.,Donghua University | Kikuchi T.,Kyoto Institute of Technology | Kikuchi T.,Toyugiken Co. | Hamada H.,Kyoto Institute of Technology | And 2 more authors.
Journal of Biobased Materials and Bioenergy

In this study, twisted jute yarn was used to reinforce unsaturated polyester in fabricate composites by using the spray-up method. Resin and compressed air was released via a spray gun. The yarn fibers were cut simultaneously; when the sprayed resin touched the cut yarn fibers both of them fell into the target receptacle. The process might need to be repeated in order to achieve the designed thickness. After that, a roller was used to push excess air out. This resulted in better impregnation and a smooth surface of the composite before curing. However, the spray-up method relies heavily on the worker's skill, and different workers can result in large variations in quality, such as uneven thickness and bubbles. In order to obtain quality stability, very advanced management techniques covering engineering and skill succession are needed. Therefore, this research gives an intermediary report based on the motion analysis of the operational spray-up method and the mechanical properties of materials used in this process. Moreover, the mechanical properties of jute/unsaturated polyester composts were investigated through tensile and bending tests. Additionally, low-cycle tests were adopted to evaluate the ability of material fatigue resistance; two types of spray-out molded glass fiber reinforced unsaturated polyester composites were used as a comparison. Copyright © 2015 American Scientific Publishers. Source

Wang Q.N.,Key Laboratory of Textile Science and Technology | Bai Y.Y.,Key Laboratory of Textile Science and Technology | Xie J.F.,Guangzhou Fibre Product Testing and Research Institute | Qiu Y.P.,Key Laboratory of Textile Science and Technology | And 5 more authors.
Materials Science Forum

Increasing air pollution caused mainly by exhaust emission has become a serious concern for public health. In order to efficiently control the exhaust emission from the origin, hot gas filtration is required in many industries, such as thermal power regeneration, metal refining/recycling, and biomass/coal gasification. This study aimed to develop a hybrid filter composed with ultrafine fibrous polyimide (PI) filtration layers and carbon woven fabric supporting layers for hot gas filtration. Uniform PI ultrafine fibers around 200 nm with small pores about 2.2 μm were electrospun on carbon fabrics supporting layers to serve as the filtration layer. During filtration test, NaCl aerosols (0.3 mm), which mimicked PM 2.5 particles were accumulated on the top of filtration layer and formed dust cake, but limited aerosols were observed on the carbon fabric supporting layers. It was proved that PI fiber mats played the key role in filtration. The filtration efficiency could be maintained above 95% after 9 min and reached 99.4%. This research proved that the multi-scale polyimide/carbon fibers hybrid filters possessed the potential to serve as filtration media in bag filters for hot gas filtration. © (2015) Trans Tech Publications, Switzerland. Source

Wang Q.,Donghua University | Bai Y.,Donghua University | Xie J.,Guangzhou Fibre Product Testing and Research Institute | Jiang Q.,Donghua University | And 3 more authors.
Powder Technology

In this work, hot gas filters composed of polyimide nanofiber membrane sandwiched between carbon woven fabrics are fabricated to capture fine particles of PM 2.5 level. Polyimide (PI) nanofibers with an average diameter of 190nm are electrospun on supporting carbon fabrics as filtration layers. The filtration performance tests show that the maximum filtration efficiency reaches 99.99% for PM 2.5, while the maximum pressure drop is only 251.86Pa after continuously testing for 25min under a constant flow rate of 20L/min. As the areal density of the PI nanofiber membrane increases, the filtration efficiency increases first and then levels off when the areal density reaches 11.64g/m2. In regeneration performance test with back air flush at a pressure of 500KPa, the composite filter maintains a filtration efficiency of 99.99% and a pressure drop of about 410Pa. After heat treatment at 260 and 300°C, the composite filter shows a relatively high filtration efficiency while the tensile strength of the carbon fabric does not change significantly. © 2016 Elsevier B.V. Source

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