Ansys student products can be installed on any supported ms windows 64bit machine. Some other researchers implemented a finite element model for stress analysis of gear drives based on multipoint. Contact stress distribution of large diameter ball bearing. The elemental mean will create a checkerboard of results where each element will have one value. Hertzian contact pressure the expression for maximum normal pressure, p, at the line of contact is where w is the normal tooth force wt cos. A clearly laidout window allows you to enter material properties, dimensions and loads. Our renewable products can be downloaded by students across the globe. This falls into the category of hertzian contact stress, for which solutions have been workedout there are explanations on wikipedia about this. Hertz contact stress calculations hertzwin is a free hertzian contact stress calculator. We can also do wear analysis due to frictional rubbing between the contact surfaces. Contact stress analysis of spur gear under the different. Stefan ghimisi, constantin brancusi university of targu jiu abstract. To generate the profile of spur gear teeth and calculate of gear bending stress using lewis equation and hence check the feasibility of modified gear profile. The bending stress obtained by finite element analysis method is compared with bending stress obtained by lewis equation and the contact stress obtained by finite element analysis method is compared.
Index termsansys, finite element method, rail, solid. Procedure for this project, the solution was done in stages. It can be used to calculate mechanical point and line contact dimensions and material stresses. Appendix 1 shows an example of a hertzian stress analysis of a micrometer ball pushing against an aluminum plate. It uses special target and nodetosurface contact elements. The ansys design for sketching the spur gear is used and analyzed the contact stress in mechanical ansys multiphysics p. Contact stress analysis of composite spur gear using photo.
However, there are many limiting conditions for the applications of the hct, in this paper, the contact model between a plastic cylinder and a rubber cylinder does not fit two limiting conditions. Ansys, on the other hand gave me good correlation between fea results of contact stress and expected theoretical values for typical cases. The results of the theor etical stress values are compared with. The reaction force is indicated by the leftward red arrows, whereas the longitudinal stress by the rightward red arrows in the ligament region. Stress ratio usually denoted by r is the minimum to maximum stress value ratio. Hertzwin is a free hertzian contact stress calculator. Apr 22, 20 step by step procedure of how to do static structural analysis of hertzian contact analysis ansys workbench. Results can be exported to microsoft excel and subsequent calculations, such as summations, can be performed. International journal of research in engineering, science. In this process of spur gears mating, 3 different materials were selected and the software programme was performed. In this process of spur gears mating, 3 different materials were selected and. Analysis by finite element method is a modern method for studying various contacts, allowing the determination of important parameters for the study of various contacts.
The analysis of the contact type of the bearing is presented below. Contact stress analysis of spur gear for different. Hertz contact stress calculations and graphs with hertzwin. The issue is once more to model the hertzian contact stress in a rigid cylindrical element, pushing down on a flexible plate of the same material. Bearing ball grabcad tutorials tutorialsansyshertzstresssimulationbearingball. In both cases, we are interested in the tooth load, which we got from the torque, t. The application performs all calculations automatically. Jan 29, 2017 stress ratio usually denoted by r is the minimum to maximum stress value ratio. Here the aluminum plate being r2 and having no radius was set to infinity. For an electronic copy pdf of the relevant report, click here consider a simple problem that illustrates a comparison between the analytical and numerical results. Line to solid face contact simutech group ansys fea. Using modeling software, 3d models for different modules in spur gears were generated, and the simulation was performed using ansys to estimate the bending and contact stresses. Hertz contact theory hct is a study of contact stress and deformation which is widely used in many engineering fields.
Hertz contact stress mechanical engineering general. This page provides a free online calculation for hertzian contact stress for point and line contact including a diagram for subsurface stresses. Besides the macro geometry surfaces can have microgeometry or nanogeometry roughness. The bending stresses in the tooth root and contact stresses were examined using a 3d fem model. The distribution of stress on the teeth for couple and pinion in case of nonshifted gear mechanism are shown in figure 5. Tutorial on hertz contact stress university of arizona. The value of contact stress is very important, as the stress value. With the finite element analysis fea solvers available in the suite, you can customize and automate solutions for your structural mechanics problems and parameterize them to analyze multiple design scenarios. Then the desired quantities stress, strain, dof can be plotted from the solution. In addition, it is found that the contact stress increases with higher coefficient of friction between the areas of contact. In the present work stress analysis of wheelrail is carried out with finite element based on the commercial software ansys. Lab 8 geometry creation hertzian contact create the geometry in the ansys dm or the cad software of your choice.
Contact stress analysis in wheelrail by hertzian method and finite element method. Solidworks software and analysis is done using ansys key words. Ansys workbench tutorial video beginnerexpert contact non linear frictional fe analysis grs. Maximum tooth root stress and hertzian contact stress for each solution is calculated. I found a nice paper giving the theoretical solution for a 2d plane strain problem here. Use of contact pair in ansys hertzian stresses on contact youtube. Thus, it is found that the contact stress both in the fem and analytical method is the similar with minimum variation.
Nonhertzian contact stress analysis for an elastic half. Stress analysis of composite spur gear ijert journal. I am not familiar with the different kinds of contacts in ansys, since i am just. In figure 4, when a ball contacts the raceway, the contact is a point contact if the load is zero, as shown in figure 4a. Contact stress analysis of spur gear for different materials. In workbench, change the analysis type of the geometry cell to 2d. A vibration model of ball bearings with a localized defect. Modeling hertzian stress in line contact by cilinder and plate. For such fea, ansys provides the stress analyst with a number of options. Dec 12, 2014 in this video, i have talked about the way in which the analysis is to be done of a cylinder being compressed between two rectangular plates in ansys. The spur gears are sketched, modeled and assembled in ansys designmodeler.
The hertzian equation is used to calculate the contact stress. The calculated stresses far exceed anything 6061 can withstand. The finite element analysis software ansys workbench was used for this purpose. Analysis steps lthe preprocessor called pr ep7 in ansys is where you provide the majority of the input to the program. L its main purpose is to generate the finite element model, which consists mainly of nodes, elements, and material property definitions. The student community is a public forum for authorized ansys academic product users to share ideas and ask questions. Modeling hertzian contact stress in line contact by two cylinders.
To compare the static transmission errors of slandered and modified profile of the gear teeth. The distribution of stress on the teeth for couple and pinion in case. Some time ago i have had a similar problem in calculating contact hertz stress in algor. Earlier, i uploaded a question concerning a hertzian stress modeling problem. Prabhakar purushothaman emphases on the contact stress. Ansys allows us to import geometries or to make them from within ansys, apply loading and constraints, and then solve for a solution.
Hertz contact stress is very localized, so you dont need a full cylinder, a half. The behavior is similar to the etable feature within ansys mechanical apdl. A general method of numerical solution in the nonhertzian elastic contact problem is developed using rectangular subdivisions. Or in other words it a ratio of equivalent stress and yield stress. Investigation of the effects of profile shift in helical.
Ansys provides free student software products perfect for work done outside the classroom, such as homework, capstone projects, student competitions and more. The result obtained from hertz contact stress calculator is 266. Hertz contact stress corus mechanical 27 may 04 11. Recent versions of ansys workbench mechanical include detection of contact between line bodies and faces. Stress analysis can be done using analytical methods, experimental methods, and using tools like boundary element method, finite element method etc. The project aims at the minimization of both contact stress as well as deformation to arrive at the best possible combination of driver and driven gear. The results show that the contact stress obtained from theoretical hertz equation is very less when compared to fea results hence, both results are comparable. Results such as maximum contact pressure, maximum shear stress, and maximum principal stress are determined. Pdf contact stress analysis in wheelrail by hertzian. Xansys view topic 2d stressdisplacement as input to. This kind of stress may not be significant most of the time, but may cause. In this video, i have talked about the way in which the analysis is to be done of a cylinder being compressed between two rectangular plates in. Defect model based on the hertzian contact stress distribution 3.
Stress analysis overview lstress analysis is a general term used to describe analyses where the results quantities incl ude stresses and strains. Applicability of the hertz contact theory to rolling. Since the initial problem setup changed, i decided to open a new thread. Ansys structural analysis software enables you to solve complex structural engineering problems and make better, faster design decisions. The depth of maximum shear stress was calculated only.
Recall that we compute the tangential force on the teeth as wt tr 2td, where d is the pitch diameter. The spur gear is sketched and modelled in ansys design modeller and the contact stress analysis is done in mechanical ansys multiphysics 8. Investigation of the effects of profile shift in helical gear. As finite element method fem is the easy and accurate technique for stress analysis, fea is done in finite element. Use of contact pair in ansys hertzian stresses on contact. Analysis fea are compared with theoretical hertzian equation values. Tribology simulator is a software for the simulation of the most common tribological contact a contact of two surfaces in a sliding motion. Hertz contact stress analysis and validation using finite. Analysis of fatigue stress in a hertzian form prof. Next, the analysis was done using both fem and hertizian stress formula. In this video, i have talked about the way in which the analysis is to be done of a cylinder being compressed between two rectangular plates in ansys.
For the analysis, steel and grey cast iron are used as the materials of spur gear. The major application of the method given is in the sliding contact of a short rough cylinder with an elastic half space. Contact stresses finite element analysis fea engineering. It simply did not support contact stress calculations. By considering the hardware memory and reduction of cpu timing for the analysis, the model is reduced as shown in the fig. Step by step procedure of how to do static structural analysis of hertzian contact analysis ansys workbench.
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