Papers by Keyword: Mechanical Behavior

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Authors: Аlexandr V. Koperchuk, A.V. Murin, A.A. Dortman, V.V. Filonov
Abstract: The article describes the version of safety fluid couplings where synchronization is ensured by using the lockup device with steel balls. The ways to increase the load capacity of the lockup device are considered. The mechanical behavior of the safety fluid coupling with the lockup device used for synchronizing has been parameterized in the course of experiments.
Authors: Maria Carolina dos Santos Freitas, Flavia de Paula Vitoretti, Jorge Franklin Mansur Rodrigues Filho, Viviane Lima Silva, Jose Adilson de Castro, Luciano Pessanha Moreira
Abstract: The increasing global demand for iron ore pellets has made the pelletizing companies to step up their investments. The mechanical strength of the pellets, as well as its wear resistance are important factors to characterize the mechanical behavior. These properties are influenced by the type and nature of the ore or concentrate, the additives and the subsequent heat treatment used. This paper develops a numerical finite element model in order to characterize the mechanical behavior of iron ore pellets. The main objective of this study was to establish a valid finite element model that is able to simulate the mechanical behavior of iron ore pellets. The uniaxial compression test was made to evaluate the mechanical properties of the pellets. Furthermore, modeling and simulations are done using the software ABAQUS CAE® for uniaxial compression using the material properties obtained by the test. Lastly, in order to validate the model, the experimental data is crossed with the simulation results to discuss its correlation and particularities.
Authors: Sandrine Cardinal, Ji Chao Qiao, Jean Marc Pelletier
Abstract: The gold alloys are used in jewelry for their aesthetic appearance and inertia to the environment. In jewelry a hardness superior to 300 HV is desirable to facilitate the final machining and reduce the wear of the final product. The maximum hardness that can be obtained with the standard 18 carats gold (Au75-Ag12.5-Cu12.5 (wt%)) through a combination of heat treatment and cold working is about 290 HV. Gold-based bulk metallic glasses (BMGs) are an alternative as they present unique properties in comparison with crystalline counterparts, especially easy thermoplastic processing combined with a high hardness. Pd-base BMGs are another solution, due also to their attractive features.An Au49Cu26.9Si16.3Ag5.5Pd2.3 (% at.) and a Pd40Cu30Ni10P20 (% at.) bulk metallic glasses were fabricated by a copper mould suction casting technique in an argon atmosphere. In the as-cast state hardness, shear modulus and hardness are high (HV0.3= 360 and 530 in the Au-and Pd-base BMGs, respectively). Various heat treatments have been performed to modify the microstructural state. Formation of crystalline particles induces an increase of both shear modulus and hardness but a drastic decrease in toughness and therefore this formation should be absolutely avoided during casting or thermo processing.
Authors: Wen Huang, Zhong Wei Huang
Abstract: A FEA model, based on the crystal plasticity theory, was established to study the mechanical behavior of titanium, and the microstructure evolution during deformation. Simulation on the dynamic tension of a commercially pure polycrystalline titanium at different strain rates and temperatures showed that the model can well describe the stress-strain behavior of titanium, the simulated results also revealed the contribution of different slip systems to the deformation of titanium, and the grain reorientation evolution caused by the crystallographic slipping.
Authors: Xiao Ke Li, Li Sun, Y.Y. Zhou, Shun Bo Zhao
Abstract: The steel-polypropylene hybrid fiber reinforced concrete can take full advantages of macro-scale crack resistance and toughening effect on the concrete matrix of steel and polypropylene fibers. The shortcomings of concrete are improved and there is a wide prospect application in engineering. This paper summarizes the enhancement theories of hybrid fiber reinforced concrete to explain its strengthening mechanism. The research status is reviewed including mix proportion design, working performance of fresh concrete, mechanical behaviors, durability (impermeability, shrinkage and others), and engineering applications etc. Some further researches are forecasted. It would be very useful to apply and popularize steel-polypropylene hybrid fiber reinforced concrete.
Authors: Zhi Hong Xie, Jian Hong Zhang, Li Sha Liu
Abstract: Reasonably effective methods of FRP strengthening can dramatically improve the ultimate bearing capacity, ductility and seismic performance of reinforced concrete frame joints. This paper, based on domestic and foreign experimental research and finite element numerical simulation which are working at improving bearing capacity and seismic performance of reinforced concrete frame joints, analyzes mechanism and performance factors of RC frame joints reinforced with FRP material, concludes with basic ideas and methods of FRP material RC joints, together with the direction of continuing studies.
Authors: De Gao, Yu Wang, Zhuang Liu
Abstract: A static compressive model and a dynamic compressive model have been constructed based on Sherwood-Frost’s constitutive model for a corn straw fiber reinforced composite cushioning packaging material. In deriving the models, material density, shape function, strain and strain ratio are considered. The validity of models has been verified by static compressive and dynamic impact testing. The proposed models will provide important theoretic guideline for designing this kind of cushioning material.
Authors: Guo Ning Liu, Hua Dong Zhao, He Zheng Wang, Shuang Cheng Wang, Ming Hao Zhao
Abstract: A widely used organic polymer textile material, which is made of polyester fibers and then cured in the resin afterwards to fix the original pattern of the textile, is used to study the flaw’s influence in the mechanical properties as well as its influence in the failure behavior of the textile. This kind of textile is preferably applied and acts as the re-enforcement part or component in the composite design or composite manufacturing. To mathematically and theoretically analyze the relationship between the mechanical behavior of the polyester textile and the flaw within the material, a model based on the fracture mechanics is proposed to explain the experimental results from the mechanical tests of polyester textile specimens.
Authors: Guo Ning Liu, Hua Dong Zhao, Qian Qian Guo, Sheng Gang Ma
Abstract: A commercially available PET thin film material with pure aluminum material deposited on its two surfaces is studied in this work to investigate the relationship between the mechanical behaviors and the structure of this “composite” material with the application of the concepts for the composite mechanics. This kind of structure has excellent anti-corrosion properties and can act as the good functional barrier material. Experimental researches are further carried out here to study the mechanical performance under various loading conditions as well as the influence of loading rates over the structure’s failure behavior, and over its mechanical properties like the yielding strength and the elastic modulus.
Authors: Han Sur Bang, Young Pyo Kim, Sung Min Joo, Jong Myung Kim, Won Sup Hwang
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