cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

Community Tip - Your Friends List is a way to easily have access to the community members that you interact with the most! X

Setting Material Properties in ProE 5.0

osbexg
1-Newbie

Setting Material Properties in ProE 5.0

ProENGINEER enables its users to create new materials and set multiple properties for them, for example like density, Poisson's ratio, and hardness. But some of these properties are fairly obscure, such as mechanisms damping, tensile strength, coefficient of thermal expansion, and numerous other values. Tier units are also strange, mechanism's damping is expressed in sec/in? Doesn't that sound like the inverse of velocity? And is lbm/(in sec^2) really a measurement of pressure? How is it related to kPa or psi? If anyone can help me with a website with all these values, or can even slightly explain what exactly all this means, I'd greatly appreciate it. Thank you!!


This thread is inactive and closed by the PTC Community Management Team. If you would like to provide a reply and re-open this thread, please notify the moderator and reference the thread. You may also use "Start a topic" button to ask a new question. Please be sure to include what version of the PTC product you are using so another community member knowledgeable about your version may be able to assist.
1 REPLY 1

lbm is not a unit of force, which you need for pressure. it looks weird because it's translated from mass to force. Example in metric:

Newton is (kilogram * meter) / second square. So to express unit of pressure with unit of mass you would have (Kg*m/sec^2)/mm^2

Meter / milimeter square would reduce to a numerical factor 10^6 / mm, so you end up with (Kg*/sec^2)/mm which equals to Kg/mm*sec^2, disregarding the numerical factor of 10^6.

This is the reason some of these units look weird.

BTW, when creating new materials, you do not have to insert values you don't need. Sometimes I only use density field, but mostly density, poisson's ratio, modulus of elasticity and tensile.

Hope this helped.

EDIT:

Dampening unit of sec / in would be an inverse of velocity.

lbm/(in*sec^2) is derived from lbm * acceleration of gravity / surface area . Units are: lbm * (in/sec^2) / in^2 which is equal to lbm*in / in^2 * sec^2.

in / in^2 = 1/in so we get lbm/(in*sec^2)

P.S. You can make it easier on yourself by changing units in drop down box, it will allow you to input these values in any unit you like.

Top Tags