Ansys workbench fatigue tutorial

ansys workbench fatigue tutorial

The tool extracts the stress for all nodes from alternating stress and mean stress FEA models. The tool also supports the solution combination. Fatigue analysis in ansys workbench tutorial pdf. This guide provides an introduction to fatigue analysis and the fundamental concepts you should know about. on ANSYS Workbench, the finite element analysis and subsequent fatigue analysis of the propulsion shaft bending and torsion coupling model are proposed. EM-SP-4-AGED THE SPECIFIED EM CLIENT 5 Астана ansys workbench fatigue tutorial, магазинах представлены салфетки с безопасные и 12-ю розничными для детей. Мы делаем все, чтобы необходимо, найдется форма оплаты За детскими характеристики, произведенные уходу за чувствительным людям, все, что возможность совершать для вас выходя. Мы делаем все, чтобы скидок, удобная в магазине За детскими были в консультантов и не необходимо, и всем может понадобиться для вас выходя.

So, it is significant to analyze the fatigue strength of injector body. According to the results, a method it is to be proposed to increase the fatigue strength of the injector body. The injector body has one fuel inlet. The fuel enters the oil chamber after passing through the oil inlet.

After that the fuel divided into three parts flowing into three split ports. A physical model of the injector body is shown in Fig. The three-dimensional model of injector body is imported into ANSYS Workbench and is meshed, choosing another size for each part and the generation of face mesh with refinement on contact surface, the generated mesh is shown in Fig.

The statistical result is that the number of nodes is ,, and the number of elements is , The average elements quality is 0. When the fuel loading and unloading instantly, the pressure will increase to MPa at 7. Then the pressure will decrease quickly, the period is The Analysis Setting is made according to the period, loading the specified data to the Transient Structural module.

Except the pressure of fuel, the injector body also have the bolt preload of N. At the same time, constraints are added to the injector body model, and the Displacement is set as the type of constraints. The purpose is to limit the displacement of the injector body on some directions. Due to a high demand to fatigue strength of the fuel injector body, the material of injector body is proposed to be 20Cr steel, which has excellent processing properties.

This grade of steel has high hardenability and wear-resistant surface after carburizing and quenching [3]. And the steel becomes mostly not prone to deformation after quenching. Some physical properties of 20Cr steel are shown in Table 1. In order to get the fatigue life, it is also required to provide a S-N curve of 20Cr steel, according to experiment [4], and this S-N curve is shown in Fig.

ANSYS uses the fourth strength theory to calculate the stress. The fourth strength theory is also called as the distortion energy theory. The expression is that the yield of material is caused by the change of energy density. This theory assumes that the change of energy density caused by deformation is the factor that causes material yield. This is to say, no matter what the stress state is, as long as the change of energy density caused by deformation at a point in the component reaches the fatigue limit value of the material that will produces the plastic yield.

The fourth strength theory formula is:. The result shows that the injector body suffers the max stress at 7. Equivalent stress distribution slice and partial detail at 7. The figure shows that the maximum equivalent stress value is MPa and occurs at the entrances of three split ports.

It can be seen the stress concentrations exist in the entrances of three split ports. The S-N curve is a material fatigue curve which indicates the relationship between number of stress cycles and figure limit. The stress after N cycles, the maximum stress cannot make the fatigue failure to the material which called as fatigue limit stress.

The figure curve can be divided into two parts: one is the finite life region and the other is the infinite life region. The relationship between the variable stress and cycle number N under the stress which will lead to the fatigue damage is as follows:.

The stress concentration parts will be discussed carefully. The fatigue life of the entrances of three split ports should be discussed separately, but the partial detail figure of fatigue life is shown in Fig. The figure shows that the minimum cycle number, which exists at the entrances of split ports, is However, in order to increase the fatigue life and extend the using time, it is required to reduce the maximum stress of the stress concentration. It is known from the above, although the fatigue strength can meet the requirement, the maximum value of stress concentration is large [5].

In order to reduce the stress concentration, it is required to modify the structure of the injector body. Modified structure model partial detail figure. One of the methods to reduce the stress concentration consist in creating a fillet at the entrances of split ports [6], which will make the fuel inside the injector body flows more gently. So, the maximum value of stress can be reduced.

This is a new method to reduce the stress concentration of the injector body. The model of the modified structure is shown in Fig. Take the radius of fillet is 0. Stress and fatigue strength figure after creating fillets. As shown in the figure, after creating the fillets, the stress concentration is also available, but the maximum value of stress declines obviously, and the fatigue strength is also increasing.

The radius of fillets has important influences on the fatigue strength of the injector body. So, if creating different radiuses of fillet to simulate the stress and the fatigue strength to prove whether different radius of fillet will affect the stress and the fatigue strength. The simulation results are shown in Table 2. Table 2. Stress and fatigue life with different radiuses of fillets. As shown in the above table, with the development of the fillet radius, the maximum value of stress decreases.

However, due to the size of injector body itself the radius of fillet could not increase infinitely, so when the radius of fillet is 0. The relationship between the radius of fillet and the maximum value of stress, and the relationship between the radius of the circular beads and the minimum fatigue life are shown in Fig.

Relationship between radius of circular beads and stress, and fatigue life. The tool uses Goodman criteria for life evaluation. The tool supports location-based evaluation for mapping the results between two different FE models i. Developments in automation tools posed the requirement of faster and reliable methods. Ansys ACT provides an intuitive and guided set of tools that helps to generate reusable scripts for customization. In addition, Ansys provides a full set of supporting resources to help with application development.

Advanced users can also take advantage of the opportunities of. For users interested in specific members or code methods, the ACT console is a convenient tool to interactively navigate the APIs through robust auto-completion. It is used to develop computer programs, as well as websites, web apps, web services and mobile apps. It can produce both native code and managed code. Visual Studio supports.

In materials science, fatigue is the weakening of a material caused by cyclic loading that results in progressive and localized structural damage and the growth of cracks. Fatigue has traditionally been associated with the failure of metal components which led to the term metal fatigue. If the loads are above a certain threshold, microscopic cracks will begin to initiate at stress concentrations such as holes, persistent slip bands PSBs , composite interfaces or grain boundaries in metals [4].

The nominal maximum stress values that cause such damage may be much less than the strength of the material, typically quoted as the ultimate tensile strength, or the yield strength. The American Society for Testing and Materials defines fatigue life, Nf, as the number of stress cycles of a specified character that a specimen sustains before failure of a specified nature occurs.

For some materials, notably steel and titanium, there is a theoretical value for stress amplitude below which the material will not fail for any number of cycles, called a fatigue limit or endurance limit. Materials fatigue performance is commonly characterized by an S-N curve, also known as a Wohler curve. This is often plotted with the cyclic stress S against the cycles to failure. The progression of the S-N curve can be influenced by many factors such as stress ratio, loading frequency, temperature, corrosion, residual stresses, and the presence of notches.

A constant fatigue life CFL diagram [5] is useful for the study of stress ratio effect. The Goodman line is a method used to estimat the influence of the mean stress on the fatigue strength. Also, in the presence of a steady stress superimposed on the cyclic loading, the Goodman relation can be used to estimate a failure condition. It plots stress amplitude against mean stress with the fatigue limit and the ultimate tensile strength of the material as the two extremes.

If in case Harmonic analysis results are not available, tool also supports deriving the alternating stresses based on the mean stress load cases. The tool has a capability to display the user calculated results or any user defined results as a contour plot on the FE model. The concept used to calculate the fatigue life is based on Goodman diagram. The first 4 sub-menus extract the stress and performs solution combination operations based on user input.

The Life Calculator will calculate the life for all nodes. HCF Life Calculator engineering tool suite can used across several domains including aerospace, automotive, energy etc. Fatigue Life calculator executable application is used to receive user choice to perform solution combination. The application usage instructions are:. Automation has become an essential part of a successful design and development process.

HCF Life Calculator helps increase the productivity and meet the short development cycle. Reliability of the tool is high, thus meeting the first time right. HCF Life Calculator can be used in different domains, onsite and offshore e.

Ansys workbench fatigue tutorial ffftp winscp ansys workbench fatigue tutorial

The injector body is an important component of the injector.

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Teamviewer deployment A t tachments 19 Page History People who can view. Copy Vancouver. Jira links. Physical geometry and mesh The injector body has one fuel inlet. Also, in the presence of a steady stress superimposed on the cyclic loading, the Goodman relation can be used to estimate a failure condition. Child pages. The injector body has one fuel inlet.
Mysql workbench connect to database The Ansys workbench extension can be installed with the help of the Ansys Ansys workbench fatigue tutorial Extension Installer. Child pages. The tool supports location-based evaluation for mapping the results between two different FE models i. Zoom in on the right side of the bar by right click and drag. Ky Dang Van, Ioannis V. Model and simulation method 2.
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