Non-Local Damage Model to Predict the Effect of Pre-Strain on Ductile Fracture in Aluminum Alloy 5052

2012 ◽  
Author(s):  
Yaser Alinaghian ◽  
Mahyar Asadi ◽  
Arnaud Weck
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Model ◽  
Ductile Fracture ◽  
Damage Model ◽  
Element Model ◽  
Local Damage ◽  
Micron Size ◽  
Non Local ◽  
The Finite Element Model

Metallic components may develop plastic deformation before in-service loading (pre-strain) due to manufacturing process and/or unexpected loading. This pre-strain not only affects the yield strength of the material but also influences its fracture properties. The work presented here employed laser drilled model materials to better understand the effect of pre-strain on ductile fracture in aluminum alloy 5052. The micron-size laser drilled holes mimic voids forming during ductile fracture. These laser holes are introduced after the material has been pulled in tension to various amounts of pre-strain. The effect of pre-strain on void growth and linkage leading to fracture is studied. A non-local damage is used in a finite element model to predict linkage between voids. This non-local damage has only two adjustable parameters, namely the local failure strain in uniaxial tension and the characteristic length L which intervenes in the non-local averaging scheme. The precise arrangement of the laser holes can be exactly reproduced in the finite element model which allows the model to be validated with the experimental results.

The Dynamic Dent Resistance Analysis of Automotive Hood Outer Panel

2012 ◽  
Vol 462 ◽  
pp. 259-264
Author(s):  
Shan Ling Han ◽  
Li Sha Yu ◽  
Lei Yang ◽  
Qing Liang Zeng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Model ◽  
Geometric Model ◽  
Quality Criterion ◽  
Element Model ◽  
Steel Panel ◽  
Resistance Analysis ◽  
The Finite Element Model

Dent resistance of automobile panels becomes an important issue and quality criterion. In this paper, the dynamic dent resistance of automotive hood outer panel is analyzed by means of finite element method. The geometric model of automotive hood outer panel is firstly established by UG software. Then the finite element model of automotive hood outer panel is established in ANSYS. The dynamic dent resistance of automotive hood outer panel is analyzed by simulating the collision between a rigid ball and an automotive hood outer panel. The results show that compared with the traditional steel panel, the automotive hood outer panel made of aluminum alloy can reduce its weight by 36.3% while meeting the requirement of dynamic dent resistance. It is concluded that making automotive hood outer panel by aluminum alloy is feasible for automobile lightweight.

FEM Simulation and Experimental Study on Miling Force for Aero-Aluminum Alloy Based on Trochoid-Motion

2011 ◽  
Vol 317-319 ◽  
pp. 222-226
Author(s):  
Jin Yu ◽  
Yu Xiang Shi ◽  
Gui Wu Yang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Model ◽  
Fem Simulation ◽  
Element Model ◽  
Milling Force ◽  
Parallel Motion ◽  
Aluminum Alloy 7075 ◽  
The Finite Element Model ◽  
Simulation Time

By analyzing the relative position between tool and workpiece in assemble model of finite simulation, and loading the tool with parallel motion and rotation, a finite element model based on trochoid motion is built. In order to reduce the simulation time and errors advanced meshing method was used to optimize the finite element model. This paper considers performance parameter of the workpiece, and researches a simulation of milling force on the Aero-aluminum Alloy 7075-T7451 by using ABAQUS. The milling force finite element model was verified to be feasible, and the result is reliable.

Numerical Simulation of Aluminum Alloy Wheel 13° Impact Test Based on Abaqus

2012 ◽  
Vol 215-216 ◽  
pp. 1191-1196 ◽  
Author(s):  
Xiao Ming Yuan ◽  
Li Jie Zhang ◽  
Xin Ying Chen ◽  
Bing Du ◽  
Bao Hua Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Model ◽  
Impact Test ◽  
Equivalent Plastic Strain ◽  
Element Model ◽  
Experimental Result ◽  
Alloy Wheel ◽  
The Impact ◽  
The Finite Element Model

In order to predict the result of impact test in the design phase and reduce the experimental times, which can save cost and shorten development cycle, a finite element model of aluminum alloy wheel 13-degree impact test is established based on Abaqus. All mechanical parts such as the standard impact block, the assembly of the wheel and the tire, the support and bolts are included in the finite element model. The predicted result of finite element analysis and the experimental result agree very well shows the finite element model is correct. The equivalent plastic strain value was also put forward as fracture criterion for the wheel in the impact test which realizes the transition from the qualitative analysis to the quantitative analysis in the development process of aluminum alloy wheel.

scholarly journals Sensitivity Analysis of the Influence of Structural Parameters on Dynamic Behaviour of Highly Redundant Cable-Stayed Bridges

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
B. Asgari ◽  
S. A. Osman ◽  
A. Adnan
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Structural Parameters ◽  
Element Model ◽  
Structural Behavior ◽  
Model Tuning ◽  
The Finite Element Model ◽  
Cable Stayed Bridges

The model tuning through sensitivity analysis is a prominent procedure to assess the structural behavior and dynamic characteristics of cable-stayed bridges. Most of the previous sensitivity-based model tuning methods are automatic iterative processes; however, the results of recent studies show that the most reasonable results are achievable by applying the manual methods to update the analytical model of cable-stayed bridges. This paper presents a model updating algorithm for highly redundant cable-stayed bridges that can be used as an iterative manual procedure. The updating parameters are selected through the sensitivity analysis which helps to better understand the structural behavior of the bridge. The finite element model of Tatara Bridge is considered for the numerical studies. The results of the simulations indicate the efficiency and applicability of the presented manual tuning method for updating the finite element model of cable-stayed bridges. The new aspects regarding effective material and structural parameters and model tuning procedure presented in this paper will be useful for analyzing and model updating of cable-stayed bridges.

Biodynamics of Human Thorax With Body Armors Subject to Bullet Impact

2001 ◽  
Author(s):  
Y. W. Kwon ◽  
J. A. Lobuono
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Body Armor ◽  
Projectile Impact ◽  
Human Thorax ◽  
Trachea And Bronchi ◽  
Armor System ◽  
The Finite Element Model

Abstract The objective of this study is to develop a finite element model of the human thorax with a protective body armor system so that the model can adequately determine the thorax’s biodynamical response from a projectile impact. The finite element model of the human thorax consists of the thoracic skeleton, heart, lungs, major arteries, major veins, trachea, and bronchi. The finite element model of the human thorax is validated by comparing the model’s results to experimental data obtained from cadavers wearing a protective body armor system undergoing a projectile impact.

Dynamic Analysis of a Turbocharger Centrifugal Compressor Impeller

1991 ◽  
Author(s):  
V. Ramamurti ◽  
D. A. Subramani ◽  
K. Sridhara
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Centrifugal Compressor ◽  
Element Model ◽  
Simplified Model ◽  
Cyclic Symmetry ◽  
Compressor Impeller ◽  
Cyclic Symmetric ◽  
The Finite Element Model

Abstract Stress analysis and determination of eigen pairs of a typical turbocharger compressor impeller have been carried out using the concept of cyclic symmetry. A simplified model treating the blade and the hub as isolated elements has also been attempted. The limitations of the simplified model have been brought out. The results of the finite element model using the cyclic symmetric approach have been discussed.

Analysis of Effective Pre-Stress of Continuous Rigid Frame Bridge in Service Based on Inversion Theory

2013 ◽  
Vol 671-674 ◽  
pp. 1012-1015
Author(s):  
Zhao Ning Zhang ◽  
Ke Xing Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Inversion Method ◽  
Vertical Deflection ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Inversion Theory ◽  
Rigid Frame Bridge ◽  
The Finite Element Model

Due to the environment, climate, loads and other factors, the pre-stress applied to the beam is not a constant. It is important for engineers to track the state of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress is analyzed by establishing the finite element model.

scholarly journals Physical Principles of a Piezo Accelerometer Sensitive to a Nearly Constant Signal

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3258 ◽  
Author(s):  
Valery Gupalov ◽  
Alexander Kukaev ◽  
Sergey Shevchenko ◽  
Egor Shalymov ◽  
Vladimir Venediktov
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Frequency Band ◽  
Linear Acceleration ◽  
High Sensitivity ◽  
Element Model ◽  
Wide Frequency Band ◽  
Piezoelectric Accelerometer ◽  
The Finite Element Model ◽  
Physical Principles

The paper considers the construction of a piezoelectric accelerometer capable of measuring constant linear acceleration. A number of designs are proposed that make it possible to achieve high sensitivity with small dimensions and a wide frequency band (from 10−5 Hz). The finite element model of the proposed design was investigated, and its output characteristic and scale factor (36 mV/g) were obtained.

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