scholarly journals Numerical Study on the Forming Behaviour of Multilayer Sheets

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 716
Author(s):  
Armando E. Marques ◽  
Pedro A. Prates ◽  
André F. G. Pereira ◽  
Nataliya A. Sakharova ◽  
Marta C. Oliveira ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Deep Drawing ◽  
Numerical Study ◽  
Physical And Mechanical Properties ◽  
Bulge Test ◽  
Geometrical Parameters ◽  
Equivalent Material ◽  
Element Analysis ◽  
Plastic Behaviour ◽  
Forming Behaviour

Nowadays, composite materials are playing an increasingly important role in material forming processes because they can combine remarkable physical and mechanical properties with relatively low weight. The main objective of this work is to study the forming behaviour of multi-layer sheets by finite element analysis. The possibility of replacing the composite by a single equivalent material, with a plastic behaviour similar to that of the composite, was also numerically analysed. This study focuses on two three-layer sheets, each composed of two metallic outer layers and a core of polymeric material; on one of the sheets, the outer layers are steel and, on the other, aluminium. Numerical simulations of the bulge test and of the deep drawing of a U-channel profile and a square cup were used to evaluate the behaviour of the multi-layer sheets and their equivalent materials. The influences of the difference of the mechanical properties of the constituent materials and some geometrical parameters of the deep-drawing process on the plastic behaviour, namely the curves of force vs. displacement of the punch and the strain and stress distributions, were evaluated. The possibility of using the bulge test to characterize the behaviour of the composite was also analysed.

Re-recognizing the impact of particle shape on physical and mechanical properties of sandy soils: A numerical study

2019 ◽  
Vol 253 ◽  
pp. 36-46 ◽  
Author(s):  
Zhichun Lu ◽  
Aiguo Yao ◽  
Aijun Su ◽  
Xingwei Ren ◽  
Qingbing Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Shape ◽  
Numerical Study ◽  
Physical And Mechanical Properties ◽  
Sandy Soils ◽  
The Impact

Study on the Mechanical Properties and Seismic Performance of Beam-Column Joints of Wooden Structure Building

2013 ◽  
Vol 483 ◽  
pp. 305-308
Author(s):  
Li Wen Luan ◽  
Zhong Tao
Keyword(s):  
Mechanical Properties ◽  
Uniform Design ◽  
Final Analysis ◽  
Test Material ◽  
Geometrical Parameters ◽  
Wood Block ◽  
Element Analysis ◽  
Seismic Safety ◽  
Software Analysis ◽  
Wooden Structure

This paper mainly depends on experiment. Take theory and software analysis as supplement. Using pine and fir as test material, the quantitative analysis, using uniform design method to qualitative pine, fir wood block the relationship between mechanical properties and geometrical parameters in the case of triangle, failure characteristics through experimental phenomenon of different materials and different sizes of wood in the triangle block pressure, finally using finite element analysis software ANSYS/LS-DYNA to simulate and analyze test. By comparing the analysis result of test and software, find out the problems and corresponding correction. The final analysis laid the foundation for the whole static wood structure analysis and dynamic. To provide scientific and technical support for rural residential "seismic safety engineering", thus forming the new wooden structure node and reinforcement for clause.

FORMING LIMIT OF AZ31B MAGNESIUM ALLOY SHEET IN THE DEEP DRAWING WITH CROSS-SHAPED DIE

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6045-6050 ◽  
Author(s):  
HEON YOUNG KIM ◽  
SUN CHUL CHOI ◽  
HYUNG JONG KIM ◽  
SEOK MOO HONG ◽  
YONG SEUNG SHIN ◽  
...  
Keyword(s):  
Finite Element ◽  
Magnesium Alloy ◽  
Deep Drawing ◽  
Temperature Deformation ◽  
Dome Height ◽  
Forming Limit ◽  
Process Conditions ◽  
Geometrical Parameters ◽  
Element Analysis ◽  
Az31b Magnesium Alloy

Magnesium alloy sheets are usually formed at temperatures between 150 and 300°C because of their poor formability at room temperature. In the present study, the formability of AZ31B magnesium alloy sheets was investigated by the analytical and experimental approaches. First, tensile tests and limit dome height tests were carried out at several temperatures between 25 and 300°C to get the mechanical properties and forming limit diagram (FLD). A FLD-based criterion considering the material temperature during deformation was used to predict the forming limit from a finite element analysis (FEA) of the cross-shaped cup deep drawing process. This criterion proved to be very useful in designing the geometrical parameters of the forming tools and determining optimal process conditions such as tool temperatures and blank shape by the comparison between finite element temperature-deformation analyses and physical try-out. The heating and cooling channels were also optimally designed through heat transfer analyses.

Numerical Study on Mechanical Properties of Quasi-Continuous SiCp/Al Network Composites with Various Particle Size Ratios (PSRs)

2019 ◽  
Vol 11 (07) ◽  
pp. 1950065 ◽  
Author(s):  
Xiang Gao ◽  
Xuexi Zhang ◽  
Aibin Li
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Yield Strength ◽  
Network Architecture ◽  
Numerical Study ◽  
Reinforcement Particle ◽  
Load Direction ◽  
Network Parameter ◽  
Element Analysis ◽  
Premature Failure

Recent works verified that network reinforcement design enhanced the modulus and strength of discontinuously reinforced metal–matrix composites (MMCs). The particle size ratio (PSR), i.e., the ratio of matrix to reinforcement particle diameters, defines the particle clustering degree and is an important network parameter. The effects of PSR on the mechanical properties of network SiCp/Al composites were studied via finite element analysis. The results showed that the composites with PSR [Formula: see text]:1 exhibited similar mechanical property. In contrast, composites with PSR [Formula: see text]:1 showed enhanced modulus (87.5–89.5[Formula: see text]GPa) and yield strength (303–315[Formula: see text]MPa) over homogeneous composites (modulus 75.9[Formula: see text]GPa and yield strength 299[Formula: see text]MPa). The enhanced mechanical properties were attributed to the higher load-bearing capacity of the reinforcement walls parallel to the load direction (PaW). However, premature failure and thus reduced elongation occurred with PSR [Formula: see text]:1 because network layers perpendicular to the load direction (PeW) acted as crack propagation paths. So, a threshold PSR of 7:1–8:1 was proposed for effective network design. The sacrifice of elongation needs to be solved for optimized network architecture designs.

Optimization Methodology for Innovative Automotive Crash Absorbers

2013 ◽  
Author(s):  
Luca D’Agostino ◽  
Luca Bertocchi ◽  
Luca Splendi ◽  
Antonio Strozzi ◽  
Patrizio Moruzzi
Keyword(s):  
Variable Thickness ◽  
Numerical Study ◽  
Computational Cost ◽  
Maximum Energy ◽  
Computational Time ◽  
Geometrical Parameters ◽  
Mass Ratio ◽  
Element Analysis ◽  
Vehicle Simulation ◽  
Full Vehicle

The simulation of vehicle crash impacts requires accurate and computationally expensive Finite Element analysis. An effective procedure consists in considering and establishing which improvement can be made on an equivalent sub-model of the full vehicle. In this way, all the analysis can be performed on smaller models, thus saving computational time. A full vehicle simulation is required only at the end of the design process to validate the results of the sub-model analysis. A software based on a genetic optimization algorithm has been developed in order to optimize the geometrical parameters of a variable-thickness crash absorber. A numerical study on the folding of thin-walled aluminum tubes with variable-thickness has been performed in order to achieve the maximum energy absorption-to-mass ratio. Moreover, the performance in terms of folding length and crush load peaks have been considered. Different optimization strategies have been implemented to find out which solution guarantees the achievement of the optimization target with the lowest computational cost. The results show how the approach proposed by the authors allows an efficient variable-thickness crash absorber to be obtained. In fact it performs better in term of crash behavior and energy dissipation-to-mass ratio, with respect to the original constant_thickness model.

Forming of Al 5182-O in a Servo Press at Room and Elevated Temperatures

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Long Ju ◽  
Shrinivas Patil ◽  
Jim Dykeman ◽  
Taylan Altan
Keyword(s):  
Finite Element ◽  
Deep Drawing ◽  
Elevated Temperatures ◽  
Cost Effective ◽  
Element Model ◽  
Material Behavior ◽  
Bulge Test ◽  
Element Analysis ◽  
Automotive Manufacturing ◽  
Servo Press

Aluminum alloys are increasingly used in automotive manufacturing to save weight. The drawability of Al 5182-O has been proven at room temperature (RT) and it is also shown that formability is further enhanced at elevated temperatures (ETs) in the range of 250–350 °C. A cost effective application of ET forming of Al alloys can be achieved using heated blank and cold dies (HB–CD). In this study, the material behavior of Al 5182-O is characterized using tensile test and viscous bulge test at RT. The nonisothermal finite element model (FEM) of deep drawing is developed using the commercial software pamstamp. Initially, deep drawing simulations and tests were carried out at RT using a 300 ton servo press, with a hydraulic cushion. The predictions with flow stress curves obtained from tensile and bulge tests were compared with experimental data. The effect of punch speed and temperature rise during forming at RT is investigated. The warm forming simulations were carried out by combining material data at ETs obtained from the literature. The coupled effects of sheet temperatures and punch speeds are investigated through the finite element analysis (FEA) to provide guidelines for ET stamping of Al 5182-O.

Numerical study of the stand-off distance and liner thickness effect on the penetration depth efficiency of shaped charge process

2018 ◽  
Vol 233 (3) ◽  
pp. 977-986 ◽  
Author(s):  
P Dehestani ◽  
AR Fathi ◽  
HR Mohammadi Daniali
Keyword(s):  
Finite Element ◽  
Penetration Depth ◽  
Numerical Study ◽  
Experimental Tests ◽  
Shaped Charge ◽  
Thickness Effect ◽  
Geometrical Parameters ◽  
Element Analysis ◽  
Finite Element Software ◽  
Jet Penetration

The aim of this paper is to investigate the effect of geometrical parameters on the performance of jet penetration in the process of shaped charge. To this end, the finite element analysis was used to simulate the process. The simulated process was validated by experimental tests and the effect of some parameters including stand-off distance and the liner thickness on the jet penetration depth was studied. The results indicated that choosing the optimal distance between the liner and the target (stand-off distance) can significantly affect the performance of jet penetration in the target. In addition, examining the effect of liner thickness on the penetration depth efficiency revealed that by decreasing the liner thickness, the jet penetration depth on the target increases. It should be noted that ABAQUS finite element software was used in this simulation to analyze the process of shaped charge.

Research on Performance of Steel Slag and Porous Cement Concrete Made by Steel Slag Aggregate

2011 ◽  
Vol 214 ◽  
pp. 306-311 ◽  
Author(s):  
Qun Di Liu ◽  
Jia Ying Sun ◽  
Ying Han
Keyword(s):  
Mechanical Properties ◽  
Steel Slag ◽  
Engineering Application ◽  
Physical And Mechanical Properties ◽  
Analysis Method ◽  
Cement Concrete ◽  
Normal Concrete ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Concrete Properties

Porous cement concrete, which has some superiority in environmental protection compared with normal concrete, has been more widely applied. Performance of Steel Slag and influence of the steel slag aggregate on physical and mechanical properties and durability of porous cement concrete were studied in this paper. Based on study of porous cement concrete properties, the paper puts forward several typical pavement structure forms in engineering application of porous cement concrete from finite element analysis method.

Finite Element Analysis for Deep Drawing of Tailored Heat Treated Blanks

2005 ◽  
Vol 6-8 ◽  
pp. 343-352 ◽  
Author(s):  
M. Kerausch ◽  
Marion Merklein ◽  
Detlev Staud
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Aluminum Alloys ◽  
Deep Drawing ◽  
General Idea ◽  
Drawing Process ◽  
Element Analysis ◽  
Car Body ◽  
Heat Treated

Aluminum alloys, due to their low density compared to steels, are an important group of materials, in particular for light weight construction of transport vehicles. However, aside from their low specific weight, drawing of car body components made from aluminum alloys is limited by an inferior formability. To enable a modern car body design, it is necessary to enhance the formability of aluminum sheet metal. One basic approach to reach this aim is to adapt the mechanical properties of the blank for the drawing process. The general idea is to soften the deformation zone relative to the force transferring zone, which results in an improved material flow and thus to larger drawing depths. In this paper the process sequence consisting of local induction heat treatment followed by deep drawing of precipitation hardenable aluminum alloy is presented. Using an induction system, it is possible to change the mechanical properties of the 6xxx aluminum blanks in a restricted area by influencing the precipitation structure. Tensile tests characterize the conversion from the stable naturally aged condition T4 to reversible solution heat treated W conditions of AA6016 as function of temperature and time. This effect leads to a reduction of flow stress, which is used to design an material property distribution adapted for the subsequent deep drawing process. A process characterization study provides detailed information concerning induction heating parameters, to improve the deep drawing of cylindrical cups, which results in a decisive increase of the limiting drawing ratio. Accompanying the experimental investigations, a finite element analysis approach is realized as a process design and optimization tool. Following the presented strategy, it is possible to enhance the forming capability of aluminum alloys. This leads to advanced manufacturing processes, which extend the field of applications for aluminum car body parts.

Sign in / Sign up

Export Citation Format

Share Document