Introducing Fatigue Contour Plot in LS-Pre Post LSDYNA Finite Element Crash Simulation Software

2012 ◽  
Vol 165 ◽  
pp. 275-279
Author(s):  
S.S. Aini ◽  
Sahari B. Barkawi ◽  
Aidy Ali ◽  
A.A. Nuraini ◽  
A.A. Faieza ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Computer Program ◽  
Programming Language ◽  
Simulation Software ◽  
Contour Plot ◽  
Stress Strain ◽  
Crash Simulation ◽  
Separate File ◽  
Fortran Programming Language

In this study, a computer program for calculating fatigue life of component is developed and introduced in LS-PrePost software. The program is written in Fortran programming language and the fatigue life equations used is taken from well-published literature. The materials covered are steel and aluminum. The developed program is able to read stress, strain and element values from d3plot and the keyword file. Having extracted the output from d3plot and keyword file, the fatigue life is then calculated and presented into a separate file called FATIGUE. The integration of output from FATIGUE will is displayed in LS-PrePost. Finally, the results of fatigue life contour are successfully displayed through LS-PrePost.

Finite Element Analysis Model of Corrosion Fatigue for TIG Welding Workpiece

2016 ◽  
Vol 707 ◽  
pp. 154-158
Author(s):  
Somsak Limwongsakorn ◽  
Wasawat Nakkiew ◽  
Adirek Baisukhan
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Corrosion Fatigue ◽  
Welding Process ◽  
Simulation Software ◽  
Tig Welding ◽  
Element Analysis ◽  
Fea Model

The proposed finite element analysis (FEA) model was constructed using FEA simulation software, ANSYS program, for determining effects of corrosion fatigue (CF) from TIG welding process on AISI 304 stainless steel workpiece. The FEA model of TIG welding process was developed from Goldak's double ellipsoid moving heat source. In this paper, the residual stress results obtained from the FEA model were consistent with results from the X-ray diffraction (XRD) method. The residual stress was further used as an input in the next step of corrosion fatigue analysis. The predictive CF life result obtained from the FEA CF model were consistent with the value obtained from stress-life curve (S-N curve) from the reference literaturature. Therefore, the proposed FEA of CF model was then used for predicting the corrosion fatigue life on TIG welding workpiece, the results from the model showed the corrosion fatigue life of 1,794 cycles with testing condition of the frequency ( f ) = 0.1 Hz and the equivalent load of 67.5 kN (equal to 150 MPa) with R = 0.25.

Fatigue Strength Study on Radial Bogie Vice Frame Based on Finite Element Analysis

2015 ◽  
Vol 723 ◽  
pp. 96-99
Author(s):  
Xiao Wei Wang ◽  
Mao Xiang Lang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Structural Strength ◽  
Simulation Software ◽  
Experimental Result ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Stability

The vice frame bears and transfers the forces and loads between the bogie and the vehicle body.The strength of the vice frame relates directly to the stability and smoothness of the vehicle. In this study, finite element analysis is utilized first to analyse the structural strength and fatigue life of the vice frame, and the recognize the weak parts of its structure in order to enhance its structural strength in the following design work.The finite element analysis is performed on a simulation software Ansys. Then an experiment is designed to test the fatigue strength of the vice frame. The experimental result indicates that the fatigue strength of the object corresponds to the standards and the finite element analysis has high feasibility in solving this kind of problem.

Fatigue Life Prediction in Rapid Die Casting

2008 ◽  
Author(s):  
Chuan Huat Ng ◽  
Karl-Heinrich Grote ◽  
Ru¨diger Ba¨hr
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Fatigue Life ◽  
Experimental Testing ◽  
Die Casting ◽  
Life Time ◽  
Casting Process ◽  
Simulation Software ◽  
Stress Strain ◽  
Fracture Models

During a die casting process, it is very difficult to achieve efficient and correct casting tooling endurance results by the casting designer and foundry man. However, it is very costly and time consuming to predict the tooling endurance with a trial and error method based on expertise and experience. After an extensive fatigue design study, it was possible to develop specimen design models for the simulation of the time and temperature dependent stress-strain and fracture models to determine the thermal fatigue prediction. In this research, stress-strain approach, heat transfer concept and life time calculation methods were used to predict the casting tool endurance by a computer simulation. The thermal stress and heat transfer behaviour analysis were performed using RWP casting numerical simulation software. It is shown that numerical simulation techniques can simulate stress concentration on the specimen surface to thermal behaviour. Furthermore, the result from the specimen based simulation model associated with fracture indicators permits the construction of a life time design curve independent of time and temperature. The fatigue life predicted by simulation based models and the results from experimental testing on real components are very similar. The simulation results showed that they match the experimental results, including a design safety factor.

The Numerical Analysis of Accuracy of Hydraulic Leg Cylinder in Modeling Using Solid Works Simulation

2015 ◽  
Vol 770 ◽  
pp. 456-460 ◽  
Author(s):  
G.D. Buyalich ◽  
A.V. Anuchin ◽  
A.A. Dronov
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Finite Elements ◽  
Strain State ◽  
Research Work ◽  
Simulation Software ◽  
Central Angle ◽  
Stress Strain ◽  
Maximum Performance ◽  
Solid Works

The research work on the influence of an angle α at centre and the finite element sizes in modeling a hydraulic leg cylinder has been done to determine the stress-strain state by FEM using SolidWorks Simulation software. Based on the analysis results the reasonable values of the central angle and finite elements for the cylinder and weld have been defined in terms of the smallest error and maximum performance computation.

FEM Study of Stress-Strain State of Elements of Harmonic Gear Drive with Hollow Shaft and Intermediate Rollers

2015 ◽  
Vol 770 ◽  
pp. 464-468
Author(s):  
V.V. Aksenov ◽  
V.Yu. Timofeev ◽  
A.A. Dronov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain State ◽  
Simulation Software ◽  
Stress Strain ◽  
Hollow Shaft ◽  
Gear Drive ◽  
Stress Strain State ◽  
Rolling Elements ◽  
Element Method

Stress-strain state (SSS) of the separator as one of the main elements of the geokhod harmonic gear drive with rolling elements with hollow shaft is considered. The study was conducted by Finite Element Method (FEM) using SolidWorks Simulation software.

Fatigue Life Prediction of Gear Based on Simulation Technology

2006 ◽  
Vol 324-325 ◽  
pp. 431-434
Author(s):  
Qing Bin Cui ◽  
Jing Zhu Zhang ◽  
Guan Hai Xue ◽  
Shi Chun Chen ◽  
Lei Lei
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Dynamic Load ◽  
Life Prediction ◽  
Strain State ◽  
The Self ◽  
Fatigue Life Prediction ◽  
Load Spectrum ◽  
Stress Strain ◽  
Transmission Gear

Dynamic analysis, finite element analysis and fatigue life analysis of transmission gear of Self-Propelled Gun is achieved in this paper according to the theory of multi-body dynamics, finite element and cumulative fatigue damage, and the well-known software Pro/E, ADAMS, PATRAN and FE-Fatigue are integrated in the research. The virtual prototyping model of self-propelled gun’s transmission box is built by ADAMS software. The dynamic load spectrum of transmission gear is achieved by virtual driving of Self-Propelled Gun. The finite element model of the gear is built by using PATRAN software, after defining reasonable boundary conditions, material and element properties, according to the load and the fatigue failure criterion of the gear, the stress-strain state of gear on load is studied. The dynamic load spectrum and the stress-strain state of the gear are considered as basic input data, the fatigue life of the gear is calculated by using FE-fatigue software. The road haul of gear without fault is predicted when the self-propelled gun drives on the second-class load surface at low speed. This method offers a new idea to the fatigue life prediction. It can predict fatigue life without experiments, and save cost and time. It has the great significance to the optimization design of the self-propelled gun.

Local Stress-Strain Method for the Effects of Scratch on Fatigue Performances of Cabin Glass

2011 ◽  
Vol 299-300 ◽  
pp. 51-56
Author(s):  
Hua Ding ◽  
Yu Ting He ◽  
Jin Qiang Du ◽  
Li Ming Wu ◽  
Hai Wei Zhang ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Three Dimensional ◽  
Local Stress ◽  
Element Model ◽  
Fatigue Tests ◽  
Three Dimensional Model ◽  
Stress Strain ◽  
Finite Element Software ◽  
Strain Method

The three-dimensional finite element model of cabin glass with surface scratch is built using the finite element software ANSYS, which is aimed to analyze the detailed stress around the scratch route tip. Then the fatigue notch factor can be gained through utilizing of results from three-dimensional model, which is followed by the estimation of fatigue life based on local stress-strain method. It is found that the stress around scratch route tip is nearly linearly increased with the increasing of tip depth (0.2mm<h<0.8mm) and the fatigue performances of cabin glass with surface scratch are sensitive to scratch depth. Finally, fatigue tests are carried out with the specimens of different scratch route tip depths, and validation against fatigue life by local stress-strain method and experimental data shows a good agreement, which indicates that the scratch model and the local stress-strain method for the effects of scratch on cabin glass fatigue performances are valid.

Fatigue Life Prediction for Overlap Friction Stir Linear Welds of Magnesium Alloys

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
Ruijie Wang ◽  
Hong-Tae Kang ◽  
Chonghua (Cindy) Jiang
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Magnesium Alloys ◽  
Life Prediction ◽  
Low Cycle Fatigue ◽  
Fatigue Life Prediction ◽  
Structural Stress ◽  
Stress Strain ◽  
Friction Stir ◽  
Damage Equation

This work was undertaken to analyze the stress/strain state at the critical sites in friction stir welded specimens and, further, to assess the fatigue strength of friction stir welded specimens with conventional fatigue life prediction approaches. Elastoplastic and elastic finite-element stress/strain analyses were carried out for friction-stir-linear-welded (FSLW) specimens made of magnesium alloys. The calculated stress/strain at the periphery of the weld nugget was used to evaluate the fatigue life with local life prediction approaches. First, elastoplastic finite-element models were built according to experimental specimen profiles. Fatigue life prediction was conducted with Morrow's modified Manson–Coffin (MC) damage equation and the Smith–Watson–Topper (SWT) damage equation, respectively, for different specimens under different loading cases. Life prediction results showed that both equations can to some extent give reasonable results, especially within a low-cycle fatigue life regime, with the SWT damage equation giving more conservative results. As for high-cycle life, predicted results were much longer and scattered for both methods. Shell element elastic models were then used to calculate the structural stress at the periphery of the weld nuggets. The correlation between structural stress amplitude and experimental life showed the appropriateness of the structural stress fatigue evaluation for friction stir welds. The effect of the notches at the periphery of the faying surface on life prediction was further discussed.

scholarly journals METHODS DEVELOPMENT OF STRENGTH AND RELIABILITY ANALYSIS OF ROLLING-STOCK BEARING STRUCTURE USING MATHEMATICAL MODELING METHODS

2020 ◽  
Vol 2020 (3) ◽  
pp. 29-37
Author(s):  
Vladimir Kobishchanov ◽  
Dmitriy Antipin ◽  
Dmitriy Rasin ◽  
Marina Manueva
Keyword(s):  
Mathematical Modeling ◽  
Finite Element ◽  
Fatigue Life ◽  
Strain State ◽  
Rolling Stock ◽  
Finite Element Models ◽  
Stress Strain ◽  
Stress Strain State ◽  
Bearing Structure ◽  
Pivot Joint

The purpose of the work is a procedure formation for the analysis of strength and reliability of rolling-stock bearing structure using methods of mathematical modeling. Its appraisal is shown by the example of improvements in a universal gondola car bearing structure. The procedure offered is formed by a mathematical modeling of bearing structure dynamic loading in the rolling-stock operation including shunting movement encounters. At the first stage of the procedure the dynamic computer simulations of a rail crew movement on way roughness are under development. As a result of modeling there are defined dynamic loads influencing a bearing structure in operation. The analysis of the stress-strain state of the bearing structure is carried out on the basis of detailed shell finite element models. The computation is carried out in a dynamic position through the method of the direct integration of nodal-relocation equations. The estimate of bearing structures fatigue life in a pivot area was carried out on the basis of the linear hypothesis of fatigue damages summation, the power approximation of a material fatigue curve and scheming dynamic stresses affecting the structure through the method of complete cycles. Within the limits of the procedure the history of loading was presented as a step function. On the basis of the results of a stress-strain state in the bearing structure of a gondola car body in a static and dynamic location there is carried out the analysis of fatigue life in a pivot area of the gondola car and the conclusions were drawn regarding crack-like defect occurrence in a center plate arrangement of a frame. There are offered three versions for updating the pivot joint of a gondola car with the purpose of its fatigue life increase. For each version of updating there are developed corresponding detailed finite element models of the pivot area and on their basis the analysis of strength and fatigue life is performed. On the basis of computation results and taking into account the manufacturability of center plate arrangement production an efficient version is recommended for updating a pivot joint of a gondola car. The pivot joint modernization according to the version offered allowed decreasing maximum acting stresses in the pivot joint by 27% and increasing service life of the welded joint elements up to 29 years.

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