Papers by Keyword: Finite Element Analysis (FEA)

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Authors: Qi Chao Xue, Guang Ping Zou, Ye Wu, Jia Li, Lei Shang
Abstract: Sandwich plate system (SPS) with polyurethane elastomer is more and more used on ship buildings as grillage. A Comparative Study on critical buckling loads between steel grillage and SPS stiffening plate are carried out in this paper. Plate elements and beam elements are used in numerical simulation and a rectangular model is taken as a calculating example. By using of FEA software ANSYS, ultimate buckling loads are calculated with different influential factors between steel grillage and SPS stiffening plate, including the number of stiffening ribs, inertia moment of stiffening ribs, and the thickness of plates. the analysis results of comparison shows that SPS stiffening plates have better performance than steel grillage under in plane compressive loadings.
Authors: Houda Khaterchi, Hedi Belhadjsalah
Abstract: The bone is a hierarchically structured material with mechanical properties depending on its architecture at all scales. Water plays an important role in the bio-mineralization process and serves as a plasticizer, enhancing the toughness of bone. In this paper, a trabecular bone multiscale model based on finite element analysis was developed to link scales from sub-nanoscopic scale (Microfibril) to sub-microscopic (Lamella) in order to predict the orthotropic properties of bone at different structural level. To identify the orthotropic properties, an inverse identification algorithm is used. Furthermore, the effect of water is incorporated. Good agreement is found between theoretical and experimental results.
Authors: Yong Cheng Lin, Xu Chen, Xing Shen Liu, Guo Quan Lu
Abstract: The reliability of solder joints in flip chip assemblies with both compliant (flex) and rigid (PCB) substrates was studied by accelerated temperature cycling tests and finite element modeling (FEM). In-process electrical resistance measurements and nondestructive evaluations were conducted to monitor solder joint failure behavior, hence the fatigue failure life. Meanwhile, the predicted fatigue failure life of solder joints was obtained by Darveaux’s crack initiation and growth models. It can be concluded that the solder joints in flip chip on flex assembly (FCOF) have longer fatigue life than those in flip chip on rigid board assembly (FCOB); the maximum von Mises stress/strain and the maximum shear stress/strain of FCOB solder joints are much higher than those of FCOF solder joints; the thermal strain and stress in solder joints is reduced by flex buckling or bending and flex substrate could dissipate energy that otherwise would be absorbed by solder joint. Therefore, the substrate flexibility has a great effect on solder joint reliability and the reliability improvement was attributed to flex buckling or bending during temperature cycling.
Authors: Wen Guang Jiang, Li Juan Yan
Abstract: A concise finite element model for the analysis of simple wire strand with a broken helical wire under axial load is presented in this paper. Due to the implementation of accurate helically symmetric boundary condition, the analysis model can be established based only on a small slice of the wire strand cross-section consisting of all of the remaining intact wires excluding the broken helical wire. Full three-dimensional solid elements were used for structural discretization. The finite element results showed that the sharing of loads among the remaining helical wires is highly non-uniform. The two helical wires adjacent to the broken helical wire bear higher loads. The helical wire opposite to the broken wire bears least load.
Authors: Martina Lovrenić-Jugović, Zdenko Tonković, Ante Bakić
Abstract: The present paper is concerned with an experimental research and numerical modelling of the viscoelastic-viscoplastic-damage behaviour of bovine cortical bone. A one-dimensional constitutive model is proposed to predict the experimental behaviour under creep-recovery load conditions. The material parameters are determined by fitting experimental results. The derived algorithm for the integration of the proposed constitutive model is implemented into finite element formulation. The computational algorithm shows an excellent capability to describe the tensile behaviour of bovine cortical bone for the specific mechanical conditions analyzed.
Authors: Cheng Guo, Yu Kui Wang, Zhen Long Wang, Bao Cheng Xie
Abstract: A three-dimensional coupled thermal structural model for micro electrical discharge is presented in this paper. Temperature field and thermal stress field of a single spark discharge process are analysed using this model by indirect coupling method. Temperature field is firstly solved which acts as the foundation of solving thermal stress field. To make the simulation results more reliable, these important elements are also taken into account, such as temperature-dependent properties of material, the phenomenon of plasma channel radius expanding, the percentage of discharge energy transferred to the workpiece and Gaussian distribution of heat flux. The results can explain the formation of cracks around the discharge crater. The thickness of the white layer and residual stresses can be predicated using this model.
Authors: X.Y. Kou, S.T. Tan, Hod Lipson
Abstract: Driven by the wide range of new material properties offered by multi-material 3D printing, there is emerging need to create predictive material models for these materials. A data driven process for estimating nonlinear material model is presented in this paper. In contrast with classical methods which derive the engineering stress-strain relationship assuming constant cross-section area and fixed length of a specimen, the proposed approach takes full advantage of 3D geometry of the specimen to estimate the material models. Give a hypothetical material model, virtual tensile tests are performed using Finite Element Analysis (FEA) method, and the parameters of the material model are estimated by minimizing the discrepancies of the virtual responses and the experimental results. The detailed material models, numerical algorithms as well as the optimization approaches are presented and finally preliminary results are offered.
Authors: Heng Sheng Lin, Sheng Chi Tsai, Yuan Chuan Hsu, Ming Che Hsiao, Chia Chou Ke, Bean Yin Lee
Abstract: The manifolds of airbag inflator were used to be produced by sheet-metal forming. It comprised at least eleven forming stages to achieve its final shape. Uneven wall thickness and poor dimensional accuracy were the common defects because the planar anisotropy of sheet-metal caused earing on the cup rim. In this study, the cup-shape workpiece is obtained from backward-extrusion of billets, followed by two stages of end-forming of tube and three stages of hole-piercing. During the end-forming production, the tool life of the first forming stage was the most severe because it applies close-die forging to increase its rim thickness. Therefore, in addition to the design of prestressed die insert, special attendance is paid to the partition of the die insert to further alleviate the stress level. The optimization of die insert was aided by the finite element analysis of DEFORM software. The results show that by lowering the parting line, the stress level can be minimized. The tool life can therefore be improved.
Authors: Sang Heon Yoon, Yang Jai Shin, Yong Shin Lee
Abstract: This study is concerned with a design process for a foldable container structure using a finite element analysis. A foldable container structure consists of frames, panels and hinge systems. The main structure of a foldable container carries all the loads while a hinge system is designed to provide its foldability. In this work, finite element structural analyses for the main foldable container structure are carried out based on the ISO standard regulation, whose results are then taken for the design of a hinge system. The finite element analysis with two types of hinge systems are also performed. It is found out that the main structure of a standard 20ft container could be used for the foldable container with the same capacity if the corner edge in the side assembly is strengthened. It is also concluded that the hinge systems proposed in this work could be successfully used in a foldable 20ft container.
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