Material models and finite analysis of additively printed polymer composites

2018 ◽  
Vol 53 (3) ◽  
pp. 361-371 ◽  
Author(s):  
Jong Eun Ryu ◽  
Eduardo Salcedo ◽  
Hyeok Jong Lee ◽  
Sung Jun Jang ◽  
Eun Young Jang ◽  
...  
Keyword(s):  
Tensile Test ◽  
Computational Design ◽  
Test Results ◽  
Element Analysis ◽  
Material Models ◽  
Base Materials ◽  
The Finite Element Analysis ◽  
Digital Material ◽  
Mechanical Tensile ◽  
Two Parameter

There are urgent needs to characterize and model the mechanical property of additively manufactured composite materials, known as the digital materials, for the computational design and simulation. In this study, most utilized digital material samples, which are the mixture of base polymers, Tango Black+ and Vero White+, by PolyJet (Stratasys) are chosen. Four polynomial models (Neo Hookean model, and two-, three-, and five-parameter Mooney–Rivlin models) are used to fit mechanical tensile test results up to 30% of strain. The material models were adopted in the finite element analysis simulating the tensile test to validate their accuracy. The simulation results based on the two-parameter Mooney–Rivlin model predict the stress at 30% strain with small errors (8.2, 10.5, 0.9, 5.0, and 8.0 for Tango Black+, DM40, DM50, DM60, and DM70, respectively). Additionally, scanning electron microscopy was utilized to analyze the fracture surface of the base materials (Tango Black+ and Vero White+) and the digital materials.

Numerical Biaxial Tensile Test of Aluminum Alloy Sheets Using Crystal Plasticity Model Implemented in Commercial FEM Software

2016 ◽  
Vol 725 ◽  
pp. 255-260
Author(s):  
Shohei Ochiai ◽  
Akinori Yamanaka ◽  
Toshihiko Kuwabara
Keyword(s):  
Aluminum Alloy ◽  
Tensile Test ◽  
Crystal Plasticity ◽  
Alloy Sheet ◽  
Plastic Work ◽  
Element Analysis ◽  
Material Models ◽  
Biaxial Tensile Test ◽  
Biaxial Tensile ◽  
Material Tests

To improve the accuracy of forming simulations for sheet metal, the use of material models calibrated by multiaxial material tests is essential. Adequate material models can be calibrated on the basis of the contours of equal plastic work obtained by multiaxial material tests. However, because the tests often require special experimental equipment, they are not widely used by the industry. This paper proposes a methodology for a numerical biaxial tensile test that uses ABAQUS, a popular commercial software package for finite element analysis. In numerical tests, an open-source user-defined material model (UMAT) is used to implement crystal plasticity models. In order to validate our methodology, we performed a numerical biaxial tensile test on a 6000-series aluminum alloy sheet, and the results were compared with those of biaxial tensile tests with a cruciform specimen. The results demonstrated that the proposed numerical biaxial tensile test provides a reasonable prediction of stress-strain curves and the contours of equal plastic work.

ANALYTICAL AND EXPERIMENTAL STUDIES ON 400 kV S/C PORTAL-TYPE GUYED TOWERS

2009 ◽  
Vol 09 (01) ◽  
pp. 85-106
Author(s):  
N. PRASAD RAO ◽  
S. J. MOHAN ◽  
R. P. ROKADE ◽  
R. BALA GOPAL
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Studies ◽  
Ground Level ◽  
Test Results ◽  
Element Analysis ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Guyed Towers ◽  
Analytical Behavior

The experimental and analytical behavior of 400 kV S/C portal-type guyed towers under different loading conditions is presented. The portal-type tower essentially consists of two masts extending outward in the transverse direction from the beam level to the ground. In addition, two sets of guys connected at the ground level project outward along the longitudinal axes and converge in the transverse axes. The experimental behavior of the guyed tower is compared with the results of finite element analysis. The 400 kV portal-type guyed towers with III and IVI type insulator strings are analyzed using finite element software. Full scale tower test results are verified through comparison with the results of the finite element analysis. The initial prestress in the guys is allowed to vary from 5% to 15% in the finite element modeling. The effect of prestress variation of the guys on the tower behavior is also studied.

A New Approach to Reducing the Stress Concentration Factors of Cross-Bores in Blocks Under High Pressure

2003 ◽  
Author(s):  
Mira K. Sahney
Keyword(s):  
High Pressure ◽  
Stress Concentration ◽  
Test Results ◽  
Element Analysis ◽  
New Approach ◽  
Standard Design ◽  
The Finite Element Analysis ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Fatigue Life Test

The fundamental design of high pressure joints such as crosses and tees has remained the same for many years. However, the introduction of commercially available high pressure equipment operating at 600 MPa and higher has demanded improved designs for these classic connections. This study presents a new design concept for reducing the stress concentration at intersecting crossbores. Both the finite element analysis and the fatigue test results from the standard high pressure design and the new design are compared. The new approach realizes a 17–25% reduction in the stress concentration factors and a 40% improvement in fatigue life test results when compared to the standard design.

Numerical Simulation of Rural Brick Buildings Strengthened with CFRP under Flood Actions

2012 ◽  
Vol 238 ◽  
pp. 223-226
Author(s):  
Yong Jun Liu ◽  
Xing Tao Ma ◽  
Yong Mei Sun
Keyword(s):  
Hydrodynamic Pressure ◽  
Test Results ◽  
Hydrodynamic Load ◽  
Ansys Software ◽  
Element Analysis ◽  
Rural Buildings ◽  
The Finite Element Analysis ◽  
Conservation Of Momentum ◽  
Property Losses ◽  
Engineering Practices

In China, floods often cause life and property losses due to heavily damage and collapse of rural buildings. It is very important to conduct comprehensive research on flood behavior of rural buildings. In this paper, formula of hydrodynamic load imposed on building by flowing flood is derived based on conservation of momentum and test results firstly. Secondly, the finite element analysis of rural brick buildings strengthened with CFRP under flood actions is conducted using ANSYS software to check the effect of CFRP. Simulation results demonstrate that the formula of hydrodynamic pressure and the numerical model of rural buildings are of high accuracy, and can be referenced for further study and applied in engineering practices.

The Tip/Tilp Mirror Modal Analysis Based on Flexible Connection of Equivalent Spring

2014 ◽  
Vol 697 ◽  
pp. 226-229
Author(s):  
Cai Ling Wang ◽  
Hong Wei Wang
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Modal Analysis ◽  
Detection System ◽  
Mirror System ◽  
Test Results ◽  
Element Analysis ◽  
Element Modeling ◽  
The Finite Element Analysis ◽  
Resonance Detection

According to flexible connectivity of space stabilization system,This paper proposes the finite element analysis method using multiple equivalent spring connecting unit to replace the original flexible connections. And the elastic coefficient’s correspondence between the equivalent spring and the original spring were deduced. Using the equivalent spring method, the tip/tilt mirror system for finite element modeling is completed, After completion of the modal analysis, first-order resonant frequency is calculated. At last, the tip/tilt mirror system is tested in non-contact laser resonance detection system, And test results and modal analysis results were compared, and results show that the finite element modeling method of using equivalent spring connecting is effective. Provide constructive reference for subsequent tip/tilt mirror design, has a very important reference for similar projects.

The Layout of Strain Sensor Based on the Preanalysis Load Distribution

2012 ◽  
Vol 155-156 ◽  
pp. 474-478
Author(s):  
Yi Lu ◽  
Song Lin Zheng ◽  
Jin Zhi Feng ◽  
Li Hui Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Load Distribution ◽  
Rear Axle ◽  
Strain Tensor ◽  
Test Results ◽  
Analysis Method ◽  
Element Analysis ◽  
Main Stress ◽  
The Finite Element Analysis

In this paper, the load distribution of the rear axle of a MPV is preanalyzed, by using the finite element analysis method, which obtains the contour and the strain tensor maps in the four working conditions of the rear axle: static load, braking, steering and torsion. By analyzing the contour and strain tensor maps, the key load locations and their main stress direction is identified. Through processing data of the calibration tests, the equations of linear regression between load and strain on the rear axle are determined.Comparing with the real 5vehicle road test results, the placement locations of the sensor on the rear axle, which is determined through the finite element analysis, are verified to be correct.

Experimental Research and Simulation Analysis of Self-Repair of Cracks in Concrete Beams

2013 ◽  
Vol 446-447 ◽  
pp. 1425-1428
Author(s):  
Hong Ming Li ◽  
Jin Wu ◽  
Ying Jie Zhang
Keyword(s):  
Concrete Beams ◽  
Simulation Analysis ◽  
Glass Fibers ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Crack Repair ◽  
Average Crack ◽  
Self Repair

An efficient way to repair the damage of concrete is to enable the concrete adapt to the surrounding environment actively and have self-repair capabilities. In this paper, a type of concrete beam with embedded glass fibers filled with adhesive capable of crack self-repair was investigated. The capacity of self-repair cracks in concrete beams was verified by bending tests, and the influence of the layout of glass fibers on crack self-repair was studied. Test results show that the stiffness of concrete beams increases after crack repair. The glass fibers can be arranged according to the average crack spacing of reinforced concrete beams. In addition, the influence of the levels of crack repair on properties of concrete beams was analyzed with the finite element analysis software ANSYS.

A STUDY ON FAILURE OF CROSS ARMS IN TRANSMISSION LINE TOWERS DURING PROTOTYPE TESTING

2005 ◽  
Vol 05 (03) ◽  
pp. 435-455 ◽  
Author(s):  
N. PRASADA RAO ◽  
S. J. MOHAN ◽  
N. LAKSHMANAN
Keyword(s):  
Finite Element ◽  
Transmission Line ◽  
Nonlinear Finite Element ◽  
Test Results ◽  
Nonlinear Finite Element Method ◽  
Element Analysis ◽  
Plate Elements ◽  
The Finite Element Analysis ◽  
Different Types ◽  
The Cross

In this paper, the need for testing of transmission line towers is emphasized. The failure of cross arms that constitute a part of the tower body is analyzed by the nonlinear finite element method. The finite element analysis results are compared with the test results and the reasons for failure are discussed in detail. The cross arm is modeled using beam and plate elements. Four different types of towers with cross arms are considered. The effect of inner triangulation formed by the redundant patterns on the cross arm performance is studied. The effect of staggering secondary bracings in elevation and plan of the cross arm and detailing of cross arm tips (loading points) are also studied.

scholarly journals Building Structure Simulation System Based on BIM and Computer Model

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Bao Zhu ◽  
Huan Feng
Keyword(s):  
Finite Element ◽  
Simulation Method ◽  
Test System ◽  
Simulation System ◽  
Building Structure ◽  
Test Results ◽  
Element Analysis ◽  
Element Simulation ◽  
The Finite Element Analysis ◽  
Structure Simulation

This paper does some research and discussion on the finite element analysis of a building structure, especially the computer graphics simulation method in building structure simulation. Moreover, with the support of BIM technology and computer finite element simulation technology, this paper constructs a building structure simulation system and analyzes the building structure simulation system based on actual conditions such as building structure and stress load. In addition, this paper improves the traditional structural analysis algorithm and designs experiments to evaluate the effect of the method proposed in this paper and analyze the data in the form of simulation to compare the validity of the test results. Finally, an experiment is designed to evaluate the data processing capability of the test system in this paper. The experimental analysis results verify the effectiveness of the method in this paper, which can provide relevant theoretical references for subsequent building structure simulation.

Nonlinear Finite Element Analysis of Steel-Encased Composite Continuous Beams with High Strength Materials

2013 ◽  
Vol 648 ◽  
pp. 59-62
Author(s):  
Qi Yin Shi ◽  
Yi Tao Ge ◽  
Li Lin Cao ◽  
Zhao Chang Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Error Control ◽  
High Strength ◽  
Element Model ◽  
Test Results ◽  
Element Analysis ◽  
Continuous Beams ◽  
The Finite Element Analysis ◽  
Good Agreement

In this study, based on the test of the high strength materials of steel-encased concrete composite continuous beam, the ultimate flexural capacity of 8 composite continuous beams are analyzed by using the finite element analysis software ABAQUS. Numerical results show that it is a very good agreement for the load-deflection curves which obtained by finite element method (FEM) and those by the test results, and the error control is less than 8.5%. When selecting and utilizing appropriate cyclic constitutive model, element model and failure criterion of high strength steel and high strength concrete, the accuracy of the calculation can be improved better.

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