WORKSHOP 1 PISTON HEAD ANALYSIS

Transcription

1 WORKSHOP 1 PISTON HEAD ANALYSIS WS1-1

2 WS1-2

3 Workshop Ojetives Beome fmilir ll the steps neessry to rete very simple moel, nlyze it, n postproess the results from its nlysis using MSC.Ptrn n MSC.Nstrn. Prolem Desription Determine if the stress in this typil piston moel is low enough for the mteril to e in the liner elsti region. Piston mteril: Steel with E = 30 x 10 6 psi n ν =0.3 Pressure on piston = 1200 psi Softwre Version MSC.Ptrn 2005r2 MSC.Nstrn 2005r2 WS1-3

4 Key Conepts n Steps: Dtse: rete new tse with Anlysis Coe = MSC.Nstrn n Anlysis Type = Struturl Geometry: import Prsoli geometry of the piston Elements: mesh the geometry with soli Tet10 elements Los/BCs: onstrin the pinhole surfes, n pply pressure to the top of the piston Mterils: speify n isotropi mteril for Steel Properties: rete 3D soli property Anlysis: Solution Type = Nstrn Liner Stti, Solution Sequene = 101, Metho = Full Run Anlysis: ess nlysis results y tthing the XDB file to tse Results: plot von Mises stress n isplement results WS1-4

5 Step 1. Crete New Dtse Crete new tse lle piston. n set the moel preferenes.. File / New.. Enter piston. for the File Nme.. Clik on OK.. Set the Tolerne uner Moel Preferenes to Bse on Moel. e. Mke sure tht the Anlysis Coe n Anlysis Type re set to MSC.Nstrn n Struturl, respetively. f. Clik on OK. f e WS1-5

6 Step 2. Import the Moel Geometry f Import the moel geometry.. File / Import. Mke sure Soure is set to Prsoli.xmt.. Selet piston.xmt.. Clik on Apply. e. Clik on OK when Import Summry form ppers. f. Clik on Smooth She ion n Top View ions. g. Use the mile mouse utton n rotte the moel to ttin the sme view shown on next pge. WS1-6

7 Step 2. Import the Moel Geometry (Cont.) WS1-7

8 Step 3. Crete Finite Element Mesh Crete finite element mesh for the moel using the TetMesh-er.. Elements : Crete / Mesh / Soli.. Set Elem. Shpe, Mesher, n Topology to Tet, TetMesh, n Tet10, respetively.. Selet Soli 1 uner Input List.. Unhek Automti Clultion n enter 0.5 for the Glol Ege Length. e. Clik on Apply. e WS1-8

9 Step 5. Crete Constrints Constrin the two pinhole surfes.. Los/BCs : Crete / Displement / Nol.. Enter fixe for the New Set Nme.. Clik on Input Dt. Enter <0 0 0> uner Trnsltions only. e. Clik on OK. e WS1-9

10 Step 5. Crete Constrints (Cont.) Selet the pplition region for the nol onstrints.. Clik on Selet Applition Region. Set the Geometry Filter to Geometry.. Clik uner Selet Geometry Entities, then on the Surfe or Fe ion.. Selet oth pinhole fes n lik A. e. Clik on OK. f. Clik on Apply. Illustrte ove re the two soli fes tht re use to efine the onstrint pplition region for the moel. After hoosing the first soli fe, for the pplition region, n liking A, use the mile-mouse utton to rotte the moel n selet the other soli fe. WS1-10 e f

11 Step 6. Crete Pressure Lo Crete pressure tht will e pplie to the top surfe of the piston.. Los/BCs : Crete / Pressure/ Element Uniform.. Enter piston_pressure for the New Set Nme.. Clik on Input Dt. Enter for the Pressure. e. Clik on OK. e WS1-11

12 Step 6. Crete Pressure Lo (Cont.) Selet the pplition region for the pressure.. Clik on Selet Applition Region. Set the Geometry Filter to Geometry.. Clik uner Selet Soli Fes, then selet the top fe of the piston, n lik A.. Clik on OK. e. Clik on Apply. Shown ove is the pplition region for the pressure lo. WS1-12 e

13 Step 6. Crete Pressure Lo (Cont.) It my not seem s though the pressure lo is pplie uniformly throughout the top surfe of the piston. Tht is euse the pplition region ws geometry, n not FEM. When this is one the mrkers only pper t geometry isply lines. WS1-13

14 Step 7. Crete Mteril Properties Crete mteril property for the piston.. Mterils : Crete / Isotropi/ Mnul Input.. Enter steel for the Mteril Nme.. Clik on Input Properties. Enter 30E6 n 0.3 for the Elsti Moulus n Poisson Rtio, respetively. e. Clik on OK. f. Clik on Apply. e WS1-14 f

15 Step 8. Crete Element Properties Crete 3D element property for the moel.. Properties : Crete / 3D / Soli.. Enter piston for Property Set Nme.. Clik on Input Properties. Clik on Mt Prop Nme ion, Choose steel from Selet Mteril. e. Clik on OK. f. Clik on Selet Memers n selet Soli 1. g. Clik on A. h. Clik on Apply. g f e WS1-15 h

16 Step 9. Chek the Lo Cses Chek the lo se Defult n verify tht the orret los n ounry onitions re eing pplie.. Lo Cses : Moify. Clik on the Defult lo se.. Chek to see tht the orret los re ssigne n lik Cnel. WS1-16

17 Step 10. Run the Anlysis Sen the moel to MSC.Nstrn n nlyze the moel.. Anlysis : Anlyze / Entire Moel / Full Run.. Clik on Trnsltion Prmeters. Set Dt Output to XDB n Print.. Clik on OK. e. Clik on Solution Type f. Set Solution Type to Liner Stti n lik OK. g. Clik on Apply. e f g WS1-17

18 Step 11. Re the Results Re in the results file into MSC.Ptrn y tthing the XDB file.. Anlysis : Aess Results / Atth XDB / Result Entities.. Clik on Selet Results File. Selet piston.x n lik OK.. Clik on Apply. WS1-18

19 Step 11. Re the Results (Cont.) Plot oth the eformtion n the stress tensor using quik plot.. Clik on the Plot/Erse ion.. Clik on Erse uner Geometry.. Clik on OK.. Results : Crete / Quik Plot. e. Selet Stress Tensor n Displements, Trnsltionl from Selet Fringe Result n Selet Deformtion Result, respetively. f. Mke sure tht the Quntity set to von Mises. g. Clik on Apply. e f WS1-19 g

20 Step 11. Re the Results (Cont.) Moify the eformtion ttriutes.. Clik on the Deform Attriutes ion.. Unhek Show Uneforme n Show Title.. Clik Apply.. Clik on the Plot/Erse ion. e. Clik on Erse uner Geometry. f. Clik on OK. WS1-20

21 Step 11. Re the Results (Cont.) Moify the fringe ttriutes.. Clik on the Fringe Attriutes ion.. Set Disply to Element Eges.. Unhek Show Title.. Clik on Apply. WS1-21

22 Step 11. Re the Results (Cont.) Illustrte here is the omplete moel eformtion n stress fringe plot. WS1-22