Papers by Keyword: Bending Tests

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Authors: Hong Gun Kim, Young Jun Kim, Hee Jae Shin, Sun Ho Ko, Hyun Woo Kim, Young Min Kim, Yun Ju Cha, Woo Kum Lee, Lee Ku Kwac
Abstract: Al honeycomb core sandwich composite panels have different core and plate materials. The core is the Al honeycomb core, and the thin plate is GFRP sheets with fibers laminated in the 0°/90° symmetric structure. The Al honeycomb core sandwich composite panel is used for structures, which involve relatively high bending load. Before designing the structures, their stability is evaluated via the finite element analysis. In this study, an analysis method that is closest to the reality was proposed for designing the structures with Al honeycomb core sandwich composite panels. For that purpose, the modulus was reviewed. In the finite element analysis, the tensile modulus is generally used. In the results of this study, however, the tensile modulus led to significant deviations from the test results, whereas the bending modulus led to a closer value to the test results.
245
Authors: Salah-Eddine Mechraoui, S. Amami, A. Laksimi, S. Benmedakhene
237
Authors: Noella Evano, Rochdi El Abdi, Marcel Poulain
Abstract: During their use, optical fibers are subject to harsh installation and environmental conditions. To evaluate more precisely the lifetime of an optical fiber, it is necessary to study the mechanical behavior of optical fibers under extreme conditions, in particular under mechanical and thermal stress.This paper presents the results of new silica optical fibers aged in hot water between 20°C and 70°C and subjected to mechanical static bending stresses from 3 GPa to 3.5 GPa. Thermal dependence of the time to failure was observed. This dependence can be described by the Arrhenius model, where the activation energy is one of the main physical characteristic.
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Authors: Eva Rykalová
Abstract: Glass as a building material is quite used nowadays. In the Czech Republic, the glass is still considered only as a filler material; therefore assessment of them in terms of statics is difficult. This paper deals with the issue of designing of sheet of glass of railing in the Czech Republic. This article describes the process of bending tests of multilayer glass of comparable thicknesses and analyzes its behavior in terms of safety and maximum load.
208
Authors: Eva Rykalová, Radek Fabian
Abstract: Glass facades are significantly affected by the internal microclimate, and because of their use in this way it is necessary to use the secure elements of glass facades. For this purpose, safety multi-layer glass is used, which should fulfil its function after the failure of their integrity. This article describes the experimental destructive tests that indicate the behaviour of multi-layer safety glasses, depending on the thickness of the individual layers of the glass composite. A part of the article is the analysis of the cracks of broken elements depending on their thickness.
41
Authors: Nilson Tadeu Mascia, Raul Martini Mayer
Abstract: This paper presents an analysis on the viability of the use of natural fibres, in particular sisal fibres, as a reinforcing material in wood laminate structures. The use of natural fibres associated to the manufacturing of beams, with wood from reforestation, is in accordance with the current economic interest and ecological appeal. Sisal fibres have attracted attention for presenting adequate mechanical characteristics for such application. The laminated beams used in this research were constituted by Pinus sp and were reinforced by sisal strips with a thickness of 2 mm glued by Epoxi adhesive on bottom of the beam on the tensile region. Each lamina had the following dimensions: width of 50 mm, height of 20 mm and the length of the beam is 1.5 m. For the theoretical analysis of wood laminate beams three models: stress functions, classical lamination theory and section transformed method are carried out. It was noted that the average differences between the theoretical results and experimental data are given by: 11% and 2 % for normal and shear stresses respectively, and around 8%, for displacements. As a conclusion, the strengthening of wood laminate beams with sisal fibres is effective in wood structural elements, in which the elastic modulus is at maximum equal to these fibres and also prevents fragile failure on critical tensile region.
553
Authors: Eva Rykalová, Radek Fabian
Abstract: Nowadays, glass is a very popular building material, in various forms (fill openings, insulation, and composites [1]) even if it is primarily regarded as a filler material in the Czech Republic and widely used in residential developments [2]. There is an effort to extend the applicability of glass in the building industry. The article deals with the experimental bending tests of multilayer glasses. The bending tests were performed for the determination of the maximum load capacity at destroying the integrity of the samples. The results of the performed tests were statistically evaluated. The aim was to find dependence between the thickness of the multilayer glass and its load capacity.
43
Authors: Ji Hoon Kim, Kil Sung Lee, In Young Yang
Abstract: The strength members, such as front-end side members, are subjected to axial compressive and bending load during collision. Therefore, it is important to consider energy absorption by the axial compression and the bending for design of effective strength members. And at the same time, it also should consider reducing weight of the members. In this study, CFRP (Carbon Fiber Reinforced Plastics) side members with single-hat-section shape were manufactured. The axial compression and the bending tests were performed for the members using universal testing machine, and the axial compression and the bending characteristics were analyzed. Stacking condition related to the energy absorption of composite materials is being considered as an issue for the structural efficiency. So the energy absorption of the member under the axial compressive load and the bending load were experimentally investigated.
203
Authors: Hiroshi Kawakami, Ahmad Faisal, Hitoshi Ozaki, Jippei Suzuki
Abstract: Effect of liner laser irradiation on bending properties of thin high carbon steel plate was investigated in this study. Laser-transformed zone included solidification structure and quenched zone by laser irradiation was observed in cross section area of specimen by double-etching. Shape of laser-transformed zone changed significantly with changing of heat input. Deformation after laser irradiation occurred by the excess of heat input. Average area ratio of laser-transformed zone for normal bending specimen without deformation was cleared at each thickness. Sensitivity for laser deformation increased with decreasing of thickness. Three points bending test was executed to obtain Flexural load-deflection curve. Bending property of thin steel plate improved by laser liner irradiation and flexural load per unit deflection increased by suitable laser irradiation condition. Absorb energy of bending test also increased by existence of laser-transformed zone.
3302
Authors: S. Yotte, É. Lacoste, C. Currit
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