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CHAPTER 9 - LAGRANGIAN LOADING CONDITIONS

CHAPTER 9 - LAGRANGIAN LOADING CONDITIONS. INITIAL CONDITIONS CONCENTRATED LOADS PRESSURE LOADS BODY LOADING. Transient Initial Condition.

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CHAPTER 9 - LAGRANGIAN LOADING CONDITIONS

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  1. CHAPTER 9 - LAGRANGIAN LOADING CONDITIONS

  2. INITIAL CONDITIONSCONCENTRATED LOADSPRESSURE LOADSBODY LOADING

  3. Transient Initial Condition Used to set the initial state of components prior to a dynamic eventMust be selected in case controlAny TICn, TICGP or TICEL entries in Bulk Data not referenced from Case Control are ignored.TIC, TIC1 - Initial VelocitiesTIC = 200 BEGIN BULK ... TIC, 200, 27, 3, , -13.3 TIC1, 200, 3, , -13.3, 100, THRU, 9999TICGP - Grid Point Initial ConditionsAllows the initial value of any valid grid point variable to be set.TIC = 200 BEGIN BULK ... TICGP, 200, 222, XVEL, -100 SET1, 222, 1, THRU, 100

  4. TICEL - Element Initial ConditionsTIC = 200 BEGIN BULK ... TICEL, 200, 222, DENSITY, 7850. SET1, 222, 1, THRU, 100TIC2 - Initialization of rotational velocity field around an axeTIC = 200 BEGIN BULK ... TIC2, 200, 27, ,10. ,1.,0.,0.,,+ +,100, THRU, 2000TIC3 - Initialization of rotational velocity field around a point of originTIC = 200 BEGIN BULK ... TIC3,7,5,,10.,,,,,+ +,100.0,,,5.0,,-7.5,,,++,100, THRU, 2000TICEEX - Initialization of velocity field defined by user INITIAL CONDITIONS (continued)

  5. Prescribes transient dynamic loadingForce or pressure loading - TYPE = 0 in TLOAD1 definitionMust be selected in Case ControlAny loading (TLOADn entry) not selected in Case Control is ignored LOADING

  6. TLOAD1, DAREA/FORCE - Fixed Direction LoadModels concentrated loads on grid points.They should be used with care since they can promote hourglassing.DAREA - defines magnitude of force or moment loading in or about a specific coordinate direction.FORCE - defines magnitude and direction of force loading. TLOAD = 100 BEGIN BULK . . . TLOAD1, 100, 110, , 0, 120 TABLED1, 120,,,,,,,, + +, 0.0, 0.0, 1.0, 1.0, ENDT FORCE, 110, 27, -6.0, 0.0, 0.0, 1.0 CONCENTRATED LOADS

  7. TLOAD1, MOMENT - Moment LoadingThe MOMENT entry is like the FORCE entry but defines fixed direction and follower moments at a gridpoint.TLOAD = 100 BEGIN BULK . . . TLOAD1, 100, 110, , 0 MOMENT, 110, 27, -6.0, 0.0, 0.0, 1.0 CONCENTRATED LOADS (continued)

  8. PRESSURE LOADS TLOAD1, PLOAD - Models pressure on an element facePressure loads can be applied to shell or solid elements facesPressure is in the direction obtained using the right hand rule on the sequence of grid points on the PLOAD entryPressure is always normal to the face. The direction of the pressure changes as the element moves during the analysis and always remains normal to the facePressure can vary arbitrarily with time and the TABLED1 entry referenced from the TLOAD1 with TYPE = 0 gives the variation of pressure with time TLOAD = 100 BEGIN BULK . . . TLOAD1, 100, 110, , 0, 120 TABLED1, 120 , 0.0, 0.0, 1.0, 1.0, ENDT PLOAD, 110, 6.0, 1, 2, 12, 11

  9. TLOAD1, GRAV - Gravity LoadingModels an overall acceleration of the bodyThe acceleration field can vary arbitrarily with time.The load is applied as forces, thus it is to be referenced by a TLOADn with TYPE = 0 TLOAD = 100 BEGIN BULK . . . TLOAD1, 100, 110, , 0, 120 TABLED1, 120 , 0.0, 1.0, 1.0, 1.0, ENDT GRAV, 110, , 9.81, 0.0, 0.0, 1.0 BODY LOADING

  10. RFORCE - Rotational forceModels spinning (angular velocity) of the meshAngular velocity field can vary arbitrarily with timeThe load is applied as forces thus it is to be referenced by a TLOADn with TYPE = 0Coriolis forces are automatically included TLOAD = 100 BEGIN BULK … .... TLOAD1, 100, 110, , 0, 120 TABLED1, 120 , 0.0, 0.0, 1.0, 1.0, ENDT RFORCE, 110, 1, , 6.0, 0.0, 1.0, 0.0 BODY LOADING (continued)

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