Papers by Keyword: Impact Resistance

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Authors: Yu Xiu Yan, Ling He, Jing Jin, Jian Wei Tao
Abstract: This paper chooses polyamide/spandex,polyester/spandex as raw material with different textile parameters to weave 8 fabrics, researches fabrics' impact resistance, elasticity, wear resistance and other properties, uses fuzzy comprehensive evaluation to analysis the comprehensive performance of 8 fabrics, confirms a kind of motorcycle clothing fabric with good impact resistance and wear ability finally , which provides a theoretical basis and practical reference for designing protective clothing with impact resistance in the future.
Authors: Ladislav Fojtl, Soňa Rusnáková, Milan Žaludek, Alexander Čapka, Vladimír Rusnák
Abstract: In the present work, mechanical properties of prepreg carbon composites are studied. Five types of composite samples with different number of layers and prepreg material corresponding to material composition used for carbon rims are manufactured by compression molding. Prepared composites are tested and compared with respect to flexural strength and modulus. Furthermore, impact performance using Charpy impact test is also evaluated.
Authors: Guang Fa Gao, Yong Chi Li, Shu Jie Yuan, Xu Yang Li
Abstract: An advanced structure containing cavities was adopted in distribution layers. A series of large-scale similarity-simulation tests was conducted on the defense effect of the four structures under plane impact loads. Based on the tests results and theoretical analysis conclusions, numerical simulations were developed by LS-DYNA software. The results indicate that the numerical results agree well with the test data; the stress peak was distinctively decayed below the cavities, and the defense effect of circle-section cavity is more effective than square-section cavity while the defense effect was weakened when a thin steel plate was laid above the cavities. Compared with clipping performance of it under the explosion loads of mass ammunition, which of the structure with cavities under plane impact loads is better effective. This work provides an important basis for designing the scientifically safe distribution layers.
Authors: Li Xia Jia, Rui Wang, Jun Mei Liu
Abstract: Two kinds of woven spacer fabrics were designed and woven with high strength low extension technical polyester filaments. Then the sandwich composite panels were built by filling polyurethane foam in the space of the fabric and combined the epoxy resin on the surface of the fabric by means of handle paste shaping craft. Finally the property of the composites,including the flexure, impact resistance and compression performance, were measured. The experimental results showed that the woven spacer fabric sandwich panels have high flexibility and rupture toughness. When the stesses of bending, impact and compression were relieved, No visible distroy of the integral panel structure was observed.
Authors: Chong Hai Xu, H.Y. Wang
Abstract: An optimum model for the compositional design of advanced ceramic composites is built based on the impact resistance. The relative impact modulus IM0 is defined as an index for the characterization of impact resistance of brittle ceramics. Computer aided optimum technique is used to get the optimum compositions of the material. Results show that the material can be expected to have the highest impact resistance which is nearly 86% higher than that of the pure alumina when the volume fraction of Al2O3, SiC and Ti(C,N) is 72.3%, 14.8% and 12.9%, respectively. An advanced SiC/Ti(C,N)/Al2O3 ceramic composite is then fabricated according to the optimum results. When used as cutting tools, its impact fracture resistance is approximately 71%-76% higher than that of the pure alumina ceramic in the machining of hardened carbon steel. The increment coincides well with that predicted directly from the optimum model. It suggests that the method is feasible in the design and fabrication of ceramic composites especially for machining application.
Authors: Gilbert Silva, C. Felíu, A. Muñoz, V. Cantavella, F. Lucas, A. Belda
Authors: Jadsadaporn Chouaytan, Varaporn Tanrattanakul
Abstract: This study showed the effect of different compounding methods on the impact resistance and tensile properties of poly(lactic acid) blended with cassava starch and natural rubber latex. Poly(ethylene glycol) was used as a plasticizer. It was found that the compounding method was important for the derived mechanical properties of the blend. Furthermore, cooling method of the extrudate also affected the mechanical properties of the blends. The air cooling in the extrusion process provided higher mechanical properties than the water cooling. This work also showed the effect of the natural rubber in the PLA/starch blend.
Authors: Muhd Fadhil Nuruddin, Norzaireen Mohd Azmee, Kok Yung Chang
Abstract: The benefits of Microwave Incinerated Rice Husk Ash (MIRHA) as partial cement replacement materials in DSCC mixes has led to the research on the possibilities of combining both MIRHA and fly ash as an addition in DSCC replacing up to 20% of cement volume whilst maintaining satisfactory properties. The addition of both materials can improve concrete properties and reduce the cost of DSCC production. These supplementary cementitious materials are expected to give positive effects on the concrete abrasion and impact resistance. The incorporations of both MIRHA and fly ash in DSCC as cement replacement materials are considered as a new type of concrete. Therefore, it is important to have a complete knowledge on the behaviour of the composite material when being subjected to repetitive dynamic loading. The test results showed that MIRHA and fly ash combination in DSCC improved both abrasion and impact resistance of DSCC compared to reference specimens.
Authors: Shui Zhang, Guo Zhong Li, Hai Yan Yuan
Abstract: This work aims to evaluate the effect of Kevlar fibers with chemical treatment on the flexural strength, compressive strength and impact resistance of cement mortar. The experimental results exhibit that Kevlar fiber with a larger percentage can increase the flexural strength and improve the impact resistance of cement mortar, and the reinforcement effect of Kevlar fiber with chemical treatment is more obvious. The surface morphology of Kevlar fiber and the fracture surface of cement mortar reinforced with Kevlar fiber were observed by SEM, and the reinforcement mechanism of the Kevlar fiber on cement mortar was discussed.
Authors: Bei Ding, Xia Zhang, Dong Liang Zhou, Chan Wen Miao
Abstract: A novel kind of block polymer with characteristics of rod-like chain conformations-water-borne polyurethane (PUA) was synthesized by incorporate polyacrylate (PA) into the PU chain to prepare an aqueous polyurethane-polyacrylate (PUA) hybrid emulsion with core-shell structure. The interactions between Water-borne PUA and C-S-H nanostructure, which include intercalation and the polymerization degree of C-S-H silicate chains, were studied by small angle X-ray diffraction spectra and 29Si NMR spectra, respectly. The influences of water-borne PUA on mechanical performance of C-S-H were investigated experimentally. The small XRD results show that no evidence is observed for any fundamental size change in the C-S-H particles that have been formed in the presence of polymer. The NMR results indicate that there is a significant increase in the Q2/Q1 ratio ranging from 0.5 for pure C-S-H to 2.2 for PUA-C-S-H, respectively. The degree of silicate polymerization increases from 3.0 for pure C-S-H to 6.4 for PUA-C-S-H by calculation. PUA had minimal harmful effect on the compressive strength whereas the flexural strength was increased by 23.2% with dosage of 0.5% and 23.3% with dosage of 1.0%, respectively.The fracture energy ratios of concrete with a dosage of PUA less than 1% are greatly improved more than double with the decreasing of concrete strength less than 10%. The water-borne PUA also enhances the impact resistance of concrete. The impact energy consumption of samples with PUA increase nearly three times more than reference samples, also better than samples with PP fiber.
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