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LOADS AND BOUNDARY CONDITIONS ON A 3-D CLEVIS

LOADS AND BOUNDARY CONDITIONS ON A 3-D CLEVIS. Workshop 3 – Introduction to MSC.Patran. Model Description

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LOADS AND BOUNDARY CONDITIONS ON A 3-D CLEVIS

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  1. LOADS AND BOUNDARY CONDITIONS ON A 3-D CLEVIS

  2. Workshop 3 – Introduction to MSC.Patran • Model Description • In this exercise you will define a finite element mesh for the Clevis model you developed earlier. You will use mesh seeding to create a refined mesh whith a higher mesh density near the bottom of the hole where you will apply a force load in a future exercise.

  3. Workshop 3 – Introduction to MSC.Patran • Objectives • Apply constraints to your model. • Create and apply a field to describe a spatially varying load. • Suggested Exercise Steps • Open up a database. • Create field. • Change picking preference. • Create boundary condition. • Display setting. • Plot markers.

  4. b c Step 1. Open Up a Database a Create a database named clevis.db. • File / Open… . • Select clevis.db for the Database List. • Click OK.

  5. a b c d e Step 2. Create Field • Create the field quadratic_load, which will be used to define a spatially varying load. • Field: Create / Spatial / PCL Function. • Enter quadratic_load as the Field Name. • Select Vector for Field Type. • Enter -100*(1-'X**2) as Second component. • Click Apply.

  6. a b c Step 3. Change Picking Preference • Preference / Picking… . • Select Enclose entire entity for Rectangle/Polygon Picking. • Click Close.

  7. a d e b c f g Step 4. Create a Boundary Condition • Create a boundary condition such that the left edge of the clevis is rigidly fixed. • Loads/BCs: Create / Displacement / Nodal • Enter clamped as New Set Name. • Click Input Data …. • Enter <0, 0, 0> as Translations. • Enter <0, 0, 0> as rotations. • Click OK. • Click Select Application Region… .

  8. b d c e d f g Step 4. Create a Boundary Condition (Cont.) a • Click Front view. • Select Geometry for Geometry Filter. • Select Surface or Face. • Select the left side of the clevis for Select Geometric Entities. • Click Add. • Click ok. • Click Apply.

  9. a d d b c e f Step 4. Create a Boundary Condition (Cont.) • Now create the quadratic load at the clevis hole • Create / Force / Nodal • Enter vertical_load as New Set Name. • Click Input Data… . • Click in the Force <F1 F2 F3> databox and select quadratic_load from Spatial Fields. • Click OK. • Click Select Application Region… .

  10. b a c d Step 4. Create a Boundary Condition (Cont.) • Select faces on bottom half of hole as shown in the figure for Select Geometric entities. • Click Add. • Click OK. • Click Apply.

  11. c g f b c i h d e Step 5. Display Setting a • Represent the quadratic load with scaled vectors instead of standard vectors with value labels. • Display / Load/BC/Elem. Props… . • Click Vectors/Filters … . • Select Scaled – Model relative. • Click Apply. • Click Cancel. • Uncheck Show LBC/El. Prop. Values. • Check Show on FEM only. • Click Apply. • Click Cancel.

  12. e a b c d Step 6. Plot Markers • For now, the Loads/BCs have disappeared. Redisplay them by using the Plot Markers command. • Loads/BCs: Plot Markers • Select Displ_clamped and Force_vertical_load for Assigned Load/BC Sets. • Select default_group for Select Groups. • Click Apply. • File / Close (This ends the exercise.)

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