Center of Gravity help

[bordo643]

is there a way to add densities to all materials in an assembly and have proe give the center of gravity?

thanks,

Chris

 

[Guest0527211403]

If you open up the assembly and do a Mass Props analysis, it should prompt you for the densities of any parts where it has not yet been defined. If it has already been defined and it is incorrect, (I think) the only way to do it is to open up each part and change the density under Edit-->Setup-->Mass Props. (NB: Watch your units)

A mapkey might make this a bit more bearable if you have a lot of parts to do this to.

The Mass Properties analysis will tell you the location of the CoG relative to the assembly's default coordinate system (unless you specify another Csys to use).

 

[foxbr]

FYI

We assign material files (on a network drive) to all our parts. Done with a mapkey when creating a new part.
When doing this, this also helps out the anaylsis guys.

To create material files we use matweb website.

http://www.matweb.com/index.asp?ckck=1

Still would be alot work though.

BTW, we use the condition line to be called out in drawings for material using a paramter and a relation.
MATERIAL=material_param("CONDITION")



al_aly_6061-t6.mat file

MATERIAL AL_ALY_6061-T6



This file may be edited using available editor.

Just type on the necessary lines appropriate values

after the "=" sign. Comments are not permitted on

lines containing material properties names.



YOUNG_MODULUS = 1.000776E+07

POISSON_RATIO = 3.300000E-01

SHEAR_MODULUS = 3.771040E+06

MASS_DENSITY = 9.754368E-02

THERMAL_EXPANSION_COEFFICIENT = 1.400011E-05

THERM_EXPANSION_REF_TEMPERATURE = 6.800000E+01

STRUCTURAL_DAMPING_COEFFICIENT =

STRESS_LIMIT_FOR_TENSION = 3.988600E+04

STRESS_LIMIT_FOR_COMPRESSION = 3.988600E+04

STRESS_LIMIT_FOR_SHEAR = 2.973320E+04

THERMAL_CONDUCTIVITY = 9.010334E+05

EMISSIVITY =

SPECIFIC_HEAT = 2.141493E-01

HARDNESS = 9.500000E+01

CONDITION = AL_ALY_6061-T6

INITIAL_BEND_Y_FACTOR = 5.000000E-01

BEND_TABLE = TABLE2

PRO_UNIT_MASS =

PRO_UNIT_LENGTH =

PRO_UNIT_SYS =

 

[foxbr]

If needed I could send you our material files we have about 150.

 

[Guest0527211403]

MCADCentral has a ZIP file of over 350 materials in this format as well. Sorry, don't have a link to it at the moment.