File type pdf ansys workbench contact analysis tutorial slgmbh dimensional 3d bridge truss with a surface slab as the platform. Scribd is the worlds largest social reading and publishing site. The problem is linear except the contact condition at the base which is modeled using the contact pair approach. The ansys code offers stress analysts a variety of contact element options. The aim is to find the contact stress between rail and wheel. Contact stresses and deformations mechanical engineering. The numerical model used in the study on the interaction between fretting wear and cyclic plasticity for ti6al4v by mohd tobi et al.
In this paper, we carry out a nonlinear contact stress analysis of the bolted pole using ansys. Hertzian contact of a cylinder and a sphere, steuermann contact of. Hertz contact stress analysis and validation using finite element analysis 1. Introduction when there are two nonconforming surfaces that come into contact the point or line of contact can be a location of very high stress values. Hertz developed a theory to calculate the contact area and pressure between the two. Nov 28, 2014 hertz contact stress analysis and validation using finite element analysis mr. Use of contact pair in ansys hertzian stresses on contact. Contact stress analysis of spur gear for different. Contact stress analysis of spur gear for different materials using ansys and hertz equation putti srinivasa rao1, nadipalli sriraj2, mohammad farookh2 1professor, dept. These contact stresses are called hertz contact stresses, which was first studies by hertz in 1881. They are linked with prestigious universities like mit, harvard, boston etc. The commercial software ansys workbench used as a fea tool in this. International journal for research in applied science.
Contact stress analysis of composite spur gear using photostress. Introduction when there are two nonconforming surfaces that come into contact the point or line of contact can be a location. Stresses formed by the contact of two radii can cause extremely high surface stresses. Since we are using hertzs assumption of no friction, we can nd the normal stresses. This paper presents the stress analysis of mating teeth of spur gear to find maximum contact stress in the gear teeth. Ansys workbench contact stress help i am trying to model hertz contact stress for a cylinder on a plane, but my fea pressure is less than a factor of 17 when comparing my calculations to the results. 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.
Analysis steps lthe preprocessor called pr ep7 in ansys is where you provide the majority of the input to the program. Nicholas lecain opti 521 december 3, 2011 tutorial of hertzian contact stress analysis 8. Topics that are covered include solid modeling, stress analysis, conductionconvection heat transfer, thermal stress, vibration and buckling. Tutorial of hertzian contact stress analysis, opti 521. Tutorial hertz contact stress brian taylor opti521 fall 2016, sid. Contact stress analysis of composite spur gear using photo. After hertz s work, people do a lot of study on the stresses arising from the contact between two elastic bodies. Nonlinear contact stress analysis of bolted poles ansys. Nov 28, 2018 the student community is a public forum for authorized ansys academic product users to share ideas and ask questions. It can be used to calculate mechanical point and line contact dimensions and material stresses.
In the contact analysis of ball bearing hertzian contact theory is used. Hertz contact stress is very localized, so you dont need a full cylinder, a half cylinder will do. Contact stress distribution of large diameter ball bearing. I practically followed this tutorial, but the only difference besides the case is that i am doing a 3d cylinder instead of 2d sphere. Hertz contact mechanics physics setup simcafe dashboard. In this study, maximum contact stress is determined. Contact stress analysis of spur gear for different materials. 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. Tutorial of hertzian contact stress analysis college of optical sciences, university of arizona, tucson, pp1 to 6, 3 dec 2011. A study of shock analysis using the finite element method. Tutorial of hertzian contact stress analysis university of arizona.
Lesson 9 hertz contact problem patran 322 exercise workbook 93 model description. Lab 8 geometry creation hertzian contact create the geometry in the ansys dm or the cad software of your choice. Thermal stress and strain in solid video dailymotion. Hertz contact stress calculations hertzwin is a free hertzian contact stress calculator. 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. Sliding perpendicular to its axis and sliding spheres. During the transmission of torque of 15000 lbin or 1694. It is designed for practicing and student engineers alike.
Finally, the next video shows how to apply boundary conditions, i. Log on to edx edx is an online learning platform offering course on almost every subjects. At the point of contact z0 so the maximum pressure is the maximum stress at contact. Axisymmetric analysis of a pressure vessel the pressure vessel shown below is made of cast iron e 14. The application of hertzian contact stress equations can. The hertz contact stress usually refers to the stress close to the area of contact between two spheres of different radii. In reality, a small contact area is being created through elastic deformation, thereby limiting the stresses considerably.
Classical, theory and matlab codes, as well as experimental resultsare used to verify finite element, solutions for a simple structuresuch as a cantilevered beam. He determines the shape function which define the change of contact. For an electronic copy pdf of the relevant report, click here. Hertz contact problem describes the behavior of a steel cylinder pressed into an. Stresses surface tractions and sliding contact cylinder.
Hertzian contact stress step by step procedure of how to do static structural analysis of hertzian contact analysis ansys workbench. Then with the local max stress value at the root of the tooth you can analyse the fatigue using the sn diagram of the material and you can find also the pv limit of the gear using the local. Keywordscontact stress, spur gear, contact ratio, finite elements. The literature has indicated a growing interest in the field of stress concentration analysis in the pressure. The model is a simplified model of a train wheel on the rail. Thaker salih dawood investigation the dynamic stresses of vibration in outer race of low speed ball bearing. Hertz contact stress calculations and graphs with hertzwin.
Mae 3323 press and shrink fits ansys workbench tutorial video thermal contact non page 35. Step by step procedure of how to do static structural analysis of hertzian contact analysis ansys workbench. In this example problem, a steel cylinder with a radius of 5 is pressed against a 2 deep aluminum base. A 2d plane strain model is a good idea, the half cylinders become half circles. The application performs all calculations automatically. Ansys simulation of hertz contact stress of a bearing ball. May 28, 2015 you need a really refined mesh maybe 2030 elements per tooth, and set the surfaces that come in contact as no penetration pointtosurface contact. Ansys contact free download as powerpoint presentation. Tutorial on hertz contact stress university of arizona.
Pdf hertz contact stress analysis and validation using finite. The results obtained from finite element analysis fea are compared with theoretical hertzian equation values. Contact stress analysis of a roller conveyor irjet. Contact stresses and deformations curved surfaces in contact. In this paper using ansys work bench software, bending stress, contact stress and static load on the tooth of spur gear drive is found. Is it important to give the non linear behaviour to it. The exercises in ansys workbench tutorial release 12. This paper presents a study by the finite element method fem of the contact tensions between two bodies and the results obtained are compared with the calculations obtained on basis of the relations of the theory of h. Through contact analysis the changes could be showed in stress, strain. Hertz contact stress analysis and validation using finite. Consider a simple problem that illustrates a comparison between the analytical and numerical results. The hertzian contact problem that consists of contact between spheres, cylinders, cones and flat surfaces. This research study has been carried out for the contact analysis of roller bearing using cae tools catia and ansys. Hertz contact stress analysis and validation using finite element analysis mr.
Contact pressure prediction comparison using implicit and. Santosh patil studies the effect of coefficient of friction along the line of action of a spur gear. Hertz contact stress analysis and validation using finite element analysis 3,777 views. The igs model was imported as model geometry from catia software. Bonded and no separation contact status will depend on. Hertz contact stress analysis and validation using finite element analysis. This paper has been written to discuss the hertz contact stress and examples of fea.
Finite element analysis of this contact point is carried out in ansys workbench. An introduction to elasticity and contact problems in mechanical apdl 15. The spur gear is sketched and modelled in ansys design modeller and the contact stress analysis is done in mechanical ansys multiphysics. The dimensions of the gears are given in table below. The simplest modification is to crown the cylinder that the contact is of double radius type, just as hertzian theory handles. In ansys the result is plotted by selecting the series of nodes at the contact region. The material of both wheel and rail is steel and the friction coefficient is 0. Hertzwin is a free hertzian contact stress calculator.
Procedia engineering 38 2012 264 a 269 18777058 a 2012 published by elsevier ltd. I am guessing it is how i am applying the force boundary condition, but not sure how i would come up with 17000 n from n the number i am. Me en 7960 precision machine design contact stresses and deformations 78 spheres in contact vertical stress distribution at center of contact area plot shows material with poissons ratio. In the following video we will demonstrate how to set up the contact interface using frictionless contacts.
Pdf hertz contact stress analysis and validation using. A clearly laidout window allows you to enter material properties, dimensions and loads. The contactaffected zone, in the absence of surface shearing tractions, entertains compressive principal stresses. Smart size is used the number of elements near the roots of the teeth are automatically are much greater than in other places. The student community is a public forum for authorized ansys academic product users to share ideas and ask questions. In hertz stress calculator the data assumed for calculation provided as input for calculating contact stress is shown in fig. We can also do wear analysis due to frictional rubbing between the contact surfaces. Journal of applied mechanics, june 1953 6 nicholas lecain, tutorial of hertzian contact stress analysis college of optical sciences, university of arizona, tucson. Index terms bending stress, contact stress, gear analysis using ansys work bench, static load. Stress analysis spur gear design by using ansys workbench. Introduction itting is a surface fatigue failure resulting from repetitions of high contact stress. Hertz contact stress analysis and validation using.
Oct 23, 2014 hi harish, yes, i think for hertzian contact that you have to model it as a general contact, which is nonlinear a linear contact is basically welded so it can only display a static contact pressure, but in case of a gear, your gear is rotating so this is definitely nonlinearyou can consider it as static though supposing your gear rotates. The contact stress in the mating gears is the key parameter in gear design. The results give us a good guide of bolted pole design. The comparison of manual analytical result, result obtained by hertz stress. Contact stress and shear stress analysis of spur gear using. I found the original pdf benchmaks report yesterday and try to reproduce it with salomeprepomaxcalculix, but still the results shows a little penetration about 0. That creates a new face to hold onto on the bottom and to push on the top. The contact pressure results are then verified by twindisc experimental results and the hertzian contact pressure equation 10.
Contact stress and shear stress analysis of spur gear. You need a really refined mesh maybe 2030 elements per tooth, and set the surfaces that come in contact as no penetration pointtosurface contact. The model is done in design modeler of ansys workbench. Modeling hertzian contact stress in line contact by two. The maximum shear stress obtained from ansys is 268.
L its main purpose is to generate the finite element model, which consists mainly of nodes, elements, and material property definitions. Cut the half circles vertically into quarter circles. Ansys and its graphic user interface, workbench version 14. As shown in the diagram below, consider a problem where we apply a downward force f of 60.