Learning Forum

[krada]

i am modelling bearing and i want to apply preload in model. my rolling elements are modelled with combination of MPC184 and traction only combin39 element. i have preload force value about 8KN. and i want to apply thermal loads to MPC184 element so it elongates and hence my spring element get force. Does anyone have idea how to do that in ANSYS APDL? i know one way of doing that which is i need to set initial temperature of MPC element and then TREF = 0 in solution module but this is not working Although i have set Langrange method for MPC element which is necessary for thermal condition in addition to thermal co-efficient of expansion. nIf someone has new idea or any error in my thought please let me know. below is material parameter.nThermExpanCoefficient_MPC184 = -12.000E-06t![1/K]nInitialTemperature_MPC184 = 2940 !294ttt![K]n*get, HighestMat, Mat,,NUM,MAXnMatModel_MPC_Elements = HighestMat+1nmp, dens, MatModel_MPC_Elements, 0.0ttnmp, alpx, MatModel_MPC_Elements, ThermExpanCoefficient_MPC184nmp, reft, MatModel_MPC_Elements, InitialTemperature_MPC184nkeyopt,ETypeNum_MPC184,2,1tn/SOLU nALLSEL,ALLnTREF, 0tnSOLVEnn

[Rahul Kumbhar]

The thermal load can be applied to rigid link,rigid beam MPC184 element because these two types only support the material properties. All other types are basically different joints do not support the material properties. You can check the details of element type at Ansys Helpnhttps://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/ans_elem/Hlp_E_MPC184.htmln

[krada]

i have already set-up the material properties of MPC elements as rigid beam and reduction method is also set to lagrange multiplier because it is capable of thermal loading but still i am not getting any expansion of MPC elements. in material model i have defined thermal expansion co-efficient and temprature gradient for MPC element. but still i do not get results.n n

[Rahul Kumbhar]

nI couldn't follow you when you say material properties of MPC element set as rigid beam. To define rigid beam you need to use keyopt(1) = 1. Is it what you already did in the model?n

[krada]

Thanks for your quick response. yes i have set keyopt(1) = 1. just forgot to put it here in question. Actually i have two this same kind of connection in one case MPC element is attached to shell element at one end and in another case it is attached to SOLID185 element. when i use same keyopt and material properties for first case i got the thermal expansion of MPC element. but when my MPC element is connected to SOLID185 i am not getting thermal expansion in MPC element. is it like the case that thermal expansion works only with Attached shell element and if not what possible reason could be?n

[Rahul Kumbhar]

can you show the script used to connect solid185 to the MPC. What is connected to the other side?n

[krada]

This is my model all BLue lines are MPC elements and Rectangles are meshed solid185 Elements. Connection between SOLID185 and MPC184 is set by NUMMERG command.