M407 Large Deflection of Micropolar Beam by Nonlinear Finite Element Method

2015 ◽  
Vol 2015.90 (0) ◽  
pp. 317
Author(s):  
Koji MINAMI ◽  
Yoji SHIBUTANI ◽  
Ryuichi TARUMI ◽  
Hiro TANAKA
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Large Deflection ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Element Method

Ultimate Compressive Strength of Imperfect Unstiffened Plates: Simple Design Equations

2004 ◽  
Vol 48 (03) ◽  
pp. 191-201
Author(s):  
Koji Masaoka ◽  
Alaa Mansour
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ultimate Strength ◽  
Large Deflection ◽  
Nonlinear Finite Element ◽  
Simple Design ◽  
Nonlinear Finite Element Method ◽  
Rigid Plastic ◽  
New Equation ◽  
Element Method

A simple design equation for predicting the ultimate compressive strength of unstiffened plates with misalignment, initial deflection, and welding residual stresses is developed in this study. A nonlinear finite element method is used to investigate the ultimate strength of the imperfect plate. The method incorporates both geometric and material nonlinearity. Buckling and plasticity behavior of the plate can be expressed using this finite element system. The results from the finite element method and an analytical method using large deflection theory together with rigid-plastic theory are compared. It was found that the analytical method using large deflection and rigid-plastic theory is not always accurate. Reduction factors of the ultimate strength due to welding residual stresses and initial deflection are generated from the results of the nonlinear finite element method. A new equation for ultimate strength of imperfect plates was developed using these reduction factors. The accuracy of the proposed new equation is confirmed by comparing it with the finite element results.

Performance Evaluation of Spring for the Vehicle Suspension System Using the Nonlinear Finite Element Method

2014 ◽  
Vol 635-637 ◽  
pp. 594-597
Author(s):  
Byeong Soo Kim ◽  
Byung Young Moon ◽  
Sung Kwan Kim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Material ◽  
Suspension System ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Air Spring ◽  
Rubber Sleeve ◽  
The Impact ◽  
Element Method

Air spring is used for the suspension system and it affects the vehicle stability and riding comfort by improving the impact-relief, braking, and cornering performance. Air Spring is comprised of the upper plate, lower plate, and rubber sleeve. Rubber sleeve is the composite material, which is made up of combination of rubber and Nylon, and the characteristics are changed according to the shape of rubber-sleeve, the angle of reinforcement cord. In this study, the distribution of internal stresses and the deformation of rubber composite material are analyzed through the nonlinear finite element method. The result showed that the internal maximum stresses and deformations about the changes of cord angle caused the more the Young's modulus decrease, the more maximum stress reduced.

scholarly journals Fast Stiffness Matrix Calculation for Nonlinear Finite Element Method

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Emir Gülümser ◽  
Uğur Güdükbay ◽  
Sinan Filiz
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stiffness Matrix ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Nonlinear Fem ◽  
Calculation Technique ◽  
Stiffness Matrices ◽  
Matrix Calculation ◽  
Element Method

We propose a fast stiffness matrix calculation technique for nonlinear finite element method (FEM). Nonlinear stiffness matrices are constructed using Green-Lagrange strains, which are derived from infinitesimal strains by adding the nonlinear terms discarded from small deformations. We implemented a linear and a nonlinear finite element method with the same material properties to examine the differences between them. We verified our nonlinear formulation with different applications and achieved considerable speedups in solving the system of equations using our nonlinear FEM compared to a state-of-the-art nonlinear FEM.

Performance Index Limits of Medium-Height RC Shear Wall Components

2010 ◽  
Vol 163-167 ◽  
pp. 1134-1138 ◽  
Author(s):  
Xiao Chun Lao ◽  
Xiao Lei Han
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Performance Index ◽  
Shear Wall ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Shear Span ◽  
Rc Shear Wall ◽  
Wall Components ◽  
Element Method

In order to determine the deformation performance index limits for medium-height RC shear wall components based on Chinese codes with the shear span ratio between 1.0 and 2.0, the reliability of the nonlinear finite element method was first verified by four typical medium-height shear wall components experiments in some literatures. Then, the nonlinear finite element method was applied to analyze a set of medium-height RC shear wall components designed according to current Chinese codes. Parametric studies were made of the influence of shear span ratio λ, axial compression ratio μ and main flexural reinforcement ratio of confined boundary members ρflex. Finally, the deformation performance index and its limits of the medium-height RC shear wall components under severe earthquakes are presented by the finite element model results.

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