Influence of a Single Bend in the Bumping Process of Large Radius Air Bending

2015 ◽  
Vol 651-653 ◽  
pp. 1090-1095 ◽  
Author(s):  
Vitalii Vorkov ◽  
Richard Aerens ◽  
Dirk Vandepitte ◽  
Joost R. Duflou
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Strength ◽  
Large Radius ◽  
Metal Part ◽  
Element Analysis ◽  
Camera System ◽  
Experimental Campaign ◽  
The Finite Element Analysis ◽  
Bending Process

Bump bending or step bending is a forming technique that allows making large radius bends in a sheet metal part by means of a series of bends performed close to each other. The bump bending process has been studied by means of both an experimental campaign and finite element analysis. High-strength steel Weldox 1300 and a punch of radius 30 mm have been used. The finite element calculations have been performed with Abaqus using the solid formulation and Implicit/Explicit solvers. The results of the finite element analysis have been validated experimentally by monitoring the bending process using a camera system aligned with the bending line. Experiments were performed on a press-brake with a capacity of 50 metric tons. Deflections of a sheet during and after bending have been measured using the images recorded by the camera. In order to investigate the influence of a new bend on a previously formed bend, experiments have been performed with different distances between two consecutive bends. Based on the experiments, the size of the affected zone for the bend has been measured. The dependence of the distance between two consecutive bends on the resulting global bending angle has been studied. Moreover the influence of the bump distance on the springback has been investigated.

The Finite Element Analysis on the Mainframe of High-Pressure Grouting Machine

2011 ◽  
Vol 94-96 ◽  
pp. 2153-2156
Author(s):  
Dong Ling Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Pressure ◽  
Static Analysis ◽  
High Strength ◽  
Value Engineering ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Pressure Grouting ◽  
Strength And Stiffness

The mainframe of high-pressure grouting machine used for daily ceramics is the main load bearing member, and it has high strength and stiffness requirements. The finite element static analysis on mainframe is discussed in this paper for researching its stress and transfiguration. The result can provide reference for design, and the discussion has some generality and practical value engineering.

Failure Mechanism of Laser Welds in Lap-Shear Specimens of a High Strength Low Alloy Steel

2010 ◽  
Author(s):  
Kamran Asim ◽  
Jaewon Lee ◽  
Jwo Pan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Failure Mechanism ◽  
Shear Failure ◽  
High Strength ◽  
Yield Function ◽  
Element Analysis ◽  
Lap Shear ◽  
Laser Welds ◽  
The Finite Element Analysis

In this study, the failure mechanism of laser welds in lap-shear specimens of a high strength low alloy (HSLA) steel under quasi-static loading conditions is examined based on the experimental results. Optical micrographs of the welds in specimens before tests were examined to understand the microstructure near the weld. A micrographic analysis of the failed welds in lap-shear specimens indicates a ductile necking/shear failure mechanism near the heat affected zone. Micro-hardness tests were conducted to provide an assessment of the mechanical properties of the joint area which has varying microstructure due to the welding process. A finite element analysis was also carried out to identify the effects of the weld geometry and different mechanical properties of the weld and heat affected zones on the failure mechanism. The computational results of the finite element analysis indicate that the material inhomogeneity and geometry of the weld bead play an important role in the ductile necking/shear failure mechanism. The computational results match well with the experimental observations of the necking/shear failure and its location. A finite element analysis with consideration of void nucleation and growth based on the Gurson yield function was also carried out. The results of the finite element analysis based on the Gurson yield function are in good agreement with the experimental observations of the initiation of ductile fracture and its location.

Failure Mechanism of Laser Welds in Lap-Shear Specimens of a High Strength Low Alloy Steel

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Jaewon Lee ◽  
Kamran Asim ◽  
Jwo Pan
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Failure Mechanism ◽  
Shear Failure ◽  
High Strength ◽  
Element Analysis ◽  
Lap Shear ◽  
Laser Welds ◽  
The Finite Element Analysis

In this study, the failure mechanism of laser welds in lap-shear specimens of a high strength low alloy (HSLA) steel under quasi-static loading conditions is examined based on the experimental and computational results. Optical micrographs of the welds in the specimens before tests were examined to understand the microstructure near the weld. A micrographic analysis of the failed welds in lap-shear specimens indicates a ductile necking/shear failure mechanism near the heat affected zone. Micro-hardness tests were conducted to provide an assessment of the mechanical properties of the joint area which has varying microstructure due to the welding process. A finite element analysis was also carried out to identify the effects of the weld geometry and different mechanical properties of the weld and heat affected zones on the failure mechanism. The results of the finite element analysis show that the geometry of the weld protrusion and the higher effective stress–plastic strain curves of the heat affected and weld zones result in the necking/shear failure of the load carrying sheet. The deformed shape of the finite element model near the weld matches well with that near a failed weld. A finite element analysis based on the Gurson yield function with consideration of void nucleation and growth was also carried out. The results of the finite element analysis indicate that the location of the material elements with the maximum void volume fraction matches well with that of the initiation of ductile fracture as observed in the experiments.

Finite Element Analysis of Axially Loaded Confined Concrete Columns

2010 ◽  
Vol 163-167 ◽  
pp. 1029-1032
Author(s):  
He Meng ◽  
Kun Yang ◽  
Qing Xuan Shi ◽  
Jin Jie Men
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Peak Load ◽  
High Strength ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Stress Distributions ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Axially Loaded

The finite element analysis of high-strength concrete columns confined by high-strength spiral lateral ties under concentric compression is introduced in this paper. The variables of tie strength, tie spacing and tie configuration influencing the characteristics of confined concrete are discussed; and the stress distributions of lateral ties and concrete at cross-section are analyzed. Compared with the test results, this finite element analysis can predict well the behavior of axially loaded concrete confined by lateral ties. It’s indicated that after peak load, normal stirrups loss the effective constraint on concrete due to yielding early, while the high-strength stirrups can continue to provide larger constraint which can improve significantly the ductility of confined concrete.

On the Identification of a Loading Scheme in Large Radius Air Bending

2015 ◽  
Vol 639 ◽  
pp. 155-162 ◽  
Author(s):  
Vitalii Vorkov ◽  
Richard Aerens ◽  
Dirk Vandepitte ◽  
Joost R. Duflou
Keyword(s):  
High Strength ◽  
Material Behavior ◽  
Large Radius ◽  
Element Analysis ◽  
Camera System ◽  
Bending Angle ◽  
Air Bending ◽  
Contact Points ◽  
Bending Process ◽  
Loading Diagram

Large radius air bending has a different loading diagram than conventional bending, which affects the material behavior during the bending process. In order to establish a correct loading diagram, the position of the contact points between the plate and the punch is determinant. The position of the contact points is depending on the evolution of the bending process and the influence of the material is unknown. In this work, the determination of the position of the contact points in large radius air bending has been studied by means of both an experimental campaign and finite element analysis. Experiments were performed on a press-brake with a capacity of 50 metric tons. High-strength steel Weldox 1300 and aluminum alloy AlMg3, and punches of radii 30, 35 and 40 mm have been used. During the bending process, the punch movement has been monitored and the bending angle has been measured by means of images recorded by a camera system. Based on the obtained results, the relation between the bending angle and the position of the contact points is discussed.

scholarly journals The Multi-Breakage Phenomenon in Air Bending Process

2014 ◽  
Vol 611-612 ◽  
pp. 1047-1053 ◽  
Author(s):  
Vitalii Vorkov ◽  
Richard Aerens ◽  
Dirk Vandepitte ◽  
Joost R. Duflou
Keyword(s):  
Finite Element ◽  
High Strength ◽  
Large Radius ◽  
Element Analysis ◽  
Bending Force ◽  
Bending Process ◽  
The Difference ◽  
The Moment ◽  
Force Calculation ◽  
Three Phases

In this work, the multi-breakage effect has been studied by means of an experimental campaign and finite element analysis. We suggest that large radius bending (XL-bending) consists of three phases that are distinguishable according to the type of contact of the plate with the tool: 1-point, surface and 2-points. In the experimental investigation the high-strength steel Weldox 1300 and a 40 mm radius punch were used. The authors created a camera setup to film the multi-breakage effect. Additionally, finite-element calculations were performed to confirm the hypothesis of the three phases of the bending process. For the springback and the bending force evaluation, the difference in the moment distribution for each phase has been calculated in the case of a beam. It shows that the multi-breakage effect must be taken into account to obtain a good accuracy for the springback and the bending force calculation.

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.

Die Compensation Design for Stamping a High Strength Automotive Bumper Inner

2013 ◽  
Vol 712-715 ◽  
pp. 796-799
Author(s):  
Fuh Kuo Chen ◽  
Shi Wei Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Strength Steel ◽  
High Strength ◽  
Structure Design ◽  
Advanced High Strength Steel ◽  
Forming Process ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Compensation Approach

Due to the requirement of lightweight in the automotive body structure design, the application of advanced high strength steel (AHSS) has been widely adopted in the automotive industry. However, the technical difficulties are also experienced in the forming process of stamping the advanced high strength steel. One of the major defects is springback. In this study, both the experimental approach and the finite element analysis were adopted to examine the springback phenomenon occurred in the stamping of a front bumper inner made of 590Y advanced high strength steel. The die compensation approach was employed to adjust the amount of springback to make the dimension of the automotive part conforming to the design specification. The accurate dimension of the production part validates the finite element analysis and the die compensation approach adopted in the present study provides a useful guideline for improving the springback defect in the stamping of advanced high strength steel sheets.

scholarly journals Design and Finite Element Analysis of All Terrain Vehicle Roll Cage

2020 ◽  
pp. 483-488
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Performance ◽  
Factor Of Safety ◽  
3D Model ◽  
High Strength ◽  
Critical Parameters ◽  
Strength Ratio ◽  
Element Analysis ◽  
The Finite Element Analysis

The paper emphasizes on designing a high performance All-Terrain Vehicle (ATV). We started the designing of 3D model of vehicle using CATIA V5 software. With considering, the critical parameters such as overall weight, safety, high strength, and ergonomics, the roll cage of all-terrain vehicle is designed and then its static analysis is carried out. The Roll cage plays a major role which provides safety to the driver and also it is a main building block of ATV. In this research paper, the roll cage is designed by considering all the constraints provided by SAE (Society of Automotive Engineers). The finite element analysis was done using ANSYS 15.0. Various impacts that the roll cage can undergo are studied. From the optimum design with considering the factor of safety in the account, the roll cage was designed with superior weight to strength ratio. The results obtained after the analysis stated the designed to be safe and sound.

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