Recent content by assafwei

Thanks, if this is true for rigid objects, than 200G seems logical in my case.

Sure, forgot to state - ground is infinitely rigid. Any other information missing?

1. The velocity at contact is the boundary condition for the simulation (to reduce simulation time). 2. Calculating deceleration to zero is problematic since there is a lot of warping and the body isn't rigid, so hand calculations will be very rough, but I will try this and see if I get...

Hi, Hope this is the correct forum for this kind of question. I am doing an explicit finite elements simulation of a tank, weighs around 7.5 Kg with internal parts, falls from 1 meter. Since I never had a validation of such an experiment I am trying to understand if the numbers are right. I...

I will be happy if you could give me some pointers instead of riddles... I will also be happy if you could explain how did you come to think that I don't understand/know the general concepts of the stress/strain curve. Please understand - I don't pretend that I do understand the concept fully...

So, Is "initial yield strength" the same as "yield strength"? Currently I get good results when using the "yield strength" as the "initial yield strength" in the FEA software (Femap) so I guess its the same, but could someone please shed a light on the subject? Thanks.

Let me rephrase (made some mess with the terms): Usually I get the tensile stress at yield (or yield strength). I need the initial yield strength, are they the same? or is the initial yield the end of the elastic portion of the curve? Forgot to mention that I am dealing with plastics, so the...

Are those the same? if not, how do I calculate the initial yield stress from the tensile strength? all the materials properties I see on the web only specify tensile strength, and I need the initial yield stress as an input on non-linear FEA analysis. Is it possible to extract the initial yield...

I returned to the textbook and realized I was really wrong. Thanks for the replies it really helped.

Thanks for the reply, I meant the other stress criterions, Since I know shear is the critical parameter, I check all three shear parameters, but than how should I consider the normal stresses in the points where the shear is at maximum, do they increase or decrease the stresses on the...

Hi, First of all I must say, I am a bit ashamed asking this question... Since its been a long time since I studied mechanics of materials and since I never used it in my line of work, I am trying to analyze a problem regarding this subject using COSMOS in solidworks, I have a model and I...

Hi, Im reading an article (The meaning of einstein's equation : http://math.ucr.edu/home/baez/einstein/node6a.html" ) and can't understand the development of one of the equations, the equation is attached as an image, I can't understand the transition from the left side of the equation to...

Unfortunbatley i don't have the equipment to measure the deflection so this method is not applicable

From what i understood, you propose to calculate the deflection using your equation and then extract the force using regular beam deflection equations? This could be feasble assumin I am trying to figure out the force exerted on a beam, unfortunatley this is not the case... I was pretty sure...

Hi, I have an impact test (Metal ball falling on plastic) and i have a problem conveting the energy (i.e. height and mass) to the force apllied to the plastic upon impact. I tried calculating with impact formulas but its difficult to estimate the time interval of the impact. I tried...