Femfat finite element method fatigue is the globally leading software for finite element based fatigue life prediction. Requirements and a solution procedure are outlined for a thermomechanical fatigue life prediction model which is then applied to 1070 steel, marm. Femfat offers fatigue life prediction flp of all vehicle components engine, gearbox, chassis, frames, car bodies and structures and machinery equipment based on finite element analyses fea. A model of bga thermal fatigue life prediction considering. With an embedded material library, hyperlife enables prediction of fatigue life under repetitive loadings experienced in a wide range of industrial applications. A risk based fatigue life assessment has been made, based on the statistical distribution of riser response predictions compared to field measurements. However, studies show that the fatigue limit may not exist for metallic materials in the very high cycle fatigue fatigue life longer than 10 7 cycles in general 42, 43. The fatigue damage model is introduced at the fibermatrix constituent scale through hypersizers coupling with nasas macgmc micromechanics software. An emphasis is placed on handson comparisons of different analysis techniques so. Hyperlife is an easytolearn fatigue analysis software developed on a solverneutral framework.
Ensure that the software tool developed through this effort will enable designers and manufacturers to better identify and address features, characteristics, and potential anomalies that could negatively impact fatigue life prior to part production, which will help to improve the quality of additively manufactured parts as well as increase the. Fatigue life prediction of composites and composite. This software has been used in the prediction of the fatigue life of a new subsea christmas tree configuration. The software at present has distortion and fatigue modules.
It provides a comprehensive toolset for durability analysis, directly interfacing with all the major finite element analysis fea results files. The demand for simulation of fatigue and durability is especially strong. Thermomechanical stresses are predicted along with contact interactions. There are many softwares available in the market for fatigue analysis like msc. Prediction of the fatigue life of cast steel containing.
In this paper, the fatigue limit is determined based on the test data in the region where the fatigue life is larger than 10 6 cycles. Abaqus fea formerly abaqus is a software suite for finite element analysis and computeraided engineering, originally released in 1978. Hotspot stressbased fatigue life prediction is used in the optweld project. The system provides fatigue life prediction from finite element analysis to durability and certification analysis before production of a prototype. Theoretical equation for predicting fatigue life is formulated using the fatigue modulus and its degradation rate. The table below summarizes which fe analysis types are applicable to which life prediction methods in this release of the. Fatigue of compositesfatigue modulus concept and life. An interactive webbased tool for fatigue analysis and life prediction. Msc fatigue fe based durability solution msc software. The models are verified with the experimental results in terms of fatigue lives. Murthy national aeronautics and space administration glenn research center cleveland, ohio 445 subodh k.
In order to do life predictions, msc nastran embedded fatigue analysis supports use of stresslife and strainlife methods using the stressstrain response results from different finite element fe analysis techniques. It makes a selfexplanatory and frustration free webbased education software, which allows users to learn the fatigue fundamentals while expanding their. Additionally to consideration of complex multiaxial loadings an assessment of welding seams as well as spot welds and selfpiercing rivets in steel. Tensile tests were conducted on each runout to measure residual strength. Learn how to use ncode designlife software to perform fatigue analysis using stresses from computer aided engineering cae tools. Easy to learn and easy to use graphical interface to perform fatigue life predictions. Perform stresslife fatigue calculations for anisotropic materials in ncode designlife correlate. It increases the reliability and robustness of components in the automotive industry as well as in machinery and plant construction.
A survey was carried out amongst the partners in the optweld consortium. Ural dieselmotor works engineers used ansys ncode designlife fatigue analysis software to calculate. For life prediction analysis of glass fiberepoxy composite laminae it will be assumed that the fatigue is a function of the fiber orientation angle. Life prediction based on the dissipated creep energy in one thermal fatigue cycle. Users around the globe may access it via internet by means of multiple platforms such as desktop and laptop computers, tablets andor smartphones. Fatigue limit is the main parameter used to calculate the eifs. Msc fatigue enables durability engineers to quickly and accurately predict. The fea program calculates the predicted stressstrain values for the system. Life prediction analysis of component and structures subjected to cyclic loading, corrosive environments, or high temperatures in the creep regime fitnessforservice analysis fatigue and fracture assessments of transmission pipelines and process piping. You can make lowcycle fatigue prediction using the strainlife models containing the en curve, coffinmanson, and combined basquin and coffinmanson model. Fatigue damage analysis and life prediction of eclip in railway fasteners based on abaqus and fesafe show all authors.
Fatigue life and durability prediction workflow altair. The fatigue module in optweld takes into account welding residual stresses and distortion in the structure. Class time includes both lecture on fatigue life prediction techniques and handson sessions where you get to put concepts into action with designlife software. Msc nastran based fatigue lifecycle predictions at. Finite element analysis of durability and fatigue life. Msc fatigue is a finite element fe based durability and damage tolerance solver. Theodore lin2 1suzhou amps software technologies co. The critical issues are whether the productcomponentassembly will reach its expected life, and if damaged, whether the productcomponentassembly will remain safely in service until the damage can be discovered and repaired. Fatigue analysis software analyzing structural fatigue comsol. This paper presents an interactive webbased tool for fatigue analysis and life prediction methodology of smooth and notched components. Mital university of toledo toledo, ohio 43606 abstract.
Predict fatigue life and damage using a wide range of cae fatigue analysis methods solvers for high temperature fatigue and creep uses stress and temperature results from fea get fast and direct simulations of vibration shaker tests in the frequency domain using designlife. Fatigue life prediction capabilities have been incorporated into the hypersizer composite analysis and structural sizing software. An ideal fatigue life prediction model should include the main features of those already established methods, and its im plementation in simulation systems co. Fatigue analysis software analyzing structural fatigue. Fatigue life prediction in composites 3 fatigue tests were continued until approximately 2 million cycles, at which point the specimens were considered to be runouts. Ansys store solder joint fatigue life predictionv2. The fatigue module is used to predict the fatigue life for the welds in the structure. An ideal fatigue life prediction model should include the main features of those already established methods, and its implementation in simulation systems could help engineers and scientists in. Hbm ncode enables fatigue life prediction from virtual simulations, making it possible to perform durability assessment up front to avoid costly design changes. Comparison between different methods for fatigue life prediction of bogie beams magnus holmgren abstract rakenteiden mekaniikka, vol. You can address the highcycle fatigue with the stresslife models containing the classical sn curve, basquin model, and an approximate sn curve. Nasalifecomponent fatigue and creep life prediction program john z. Fatigue modulus degradation is studied using an assumption that the fatigue modulus degrada tion rate follows a power function of fatigue cycle. This rela tion is simplified by strain failure criterion for the practical application.
Cae for fatigue life prediction designlife altair hyperworks. The loading can be defined in various manners and whether it is timebased, frequencybased or in the form of some sort of spectra depends on the type of fatigue analysis. The traditional physical process for fatigue life prediction physical tests are used to assess the fatigue life of a vehicle see figure 1. Subsequently, the temperaturedependent fatigue life prediction model was built up. Design engineers can go beyond performing simplified stress analysis and avoid under or overdesigning products by simulating actual loading conditions to avoid costly design changes.
Multiscale fatigue life prediction for composite panels. Fatigue life prediction of unidirectional glass fiber. The proper specification of loading variation is extremely important to achieve an accurate fatigue life prediction. The stiffness decline of each ply during cyclic loading is determined by the fatigue. Predicting the fatigue life accurately in the early stages of design and development cycle enhances product life, reduces testing and prototype costs and ensures greater speed to market. A simple fatigue life prediction algorithm using the. Predicting fatigue life is a critical aspect of the design cycle because virtually every product manufactured will wear out or break down. The fatigue parameter to be used in life prediction is then defined by 2. These innovative tools offer solutions for digital signal processing, acoustic and vibration analysis, fatigue life prediction, durability analysis, engineering data management, and reporting. Predicting fatigue life has been one of the most important problems in design. With our experience in fea and cfd and using advanced method for real world simulation including fatigue life and durability prediction, our customers could go beyond over design and minimize the cost and in the same time have a special product with maximum safety factor. When analyzing fatigue through classical methods, the stress or. Some experts concentrate on the damage mechanisms and conditions, for example.
Software and solutions for fatigue and durability analysis ncode software from hbm prenscia empowers test and cae engineers to transform data into decisions. This new methodology would help to avoid the risk of fatigue failure for injection molding tools. The name and logo of this software are based on the abacus calculation tool. Fatigue curve when analyzing fatigue through classical methods, the stress or the strain amplitude relates to the fatigue lifetime via a fatigue curve. Durability and fatigue life prediction with fea simulation. Fatigue life prediction based on amps stresslife approach fatigue fea yu hou1, h. These stress histories are used for more accurate fatigue life prediction of the mold tool. At two stress levels, 1700 and 1800mpa, further fatigue tests were carried out to assess the. Heffernan and erki found that cfrp shared part of the stress with the main steel bars in rc beams and improved the fatigue. Fatigue life prediction based on amps stresslife approach. Fatigue lives are predicted by a variety of methods, including stresslife curves, local stresses and strains, fracture mechanics, and service simulation tests.
For ease of use in standard design practice, commonly used commercial software is employed in the present stress and fatigue life simulations. An interactive webbased tool for fatigue analysis and. Other parameters that could affect the materials life such as the microstructure and process parameters will not be. Nisa offers high quality analysis using state of the art fatigue life prediction and crack growth analysis techniques.
Fatigue damage analysis and life prediction of eclip in. Durability often dominates development agendas, and empirical evaluation is by its nature timeconsuming and costly. Conditions conducive to intergranular creep damage under thermomechanical fatigue are identified, and the competing damage mechanisms are classified for steels, nibased superalloys, and al alloys. Sttr navy fatigue prediction for additive manufactured. Fatigue life prediction of gear based on simulation. Dynamic analysis, finite element analysis and fatigue life analysis of transmission gear of selfpropelled gun is achieved in this paper according to the theory of multibody dynamics, finite element and cumulative fatigue damage, and the wellknown software proe, adams, patran and fefatigue are integrated in the research. Sfat is a fatigue life analysis software for steel structures, components, as well as welded and bolted connections in bridges, cranes, offshore platforms, offshore wind structures, and other structures subjected to cyclic loading. Ali fatemi university of toledo all rights reserved chapter 2fatigue design methods 3 fatigue design flow chart. As widely observed from the fatigue tests on rc beams strengthened without prestressed cfrp in earlier times, the fracture of tensile steel bars at the main cracked section is the controlling failure mode. Fatigue life prediction of composite laminate scientific. Leveraging the new, extremely userfriendly hyperworks x framework, the new release features. Sometimes numerical modelling of material properties for fatigue can avoid the need to do so much experimental testing and digimat provides a numerical modelling approach for this.