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Hi, Shock testing (such as MIL-STD-810)normally involves applying an acceleration over a short time interval (example: 40g over 10 ms or something like that). If you have access to basic FEA software, this can be applied as an equivalent static G load but it doesn't consider the dynamics...

Hi all, An earlier posting in 2007( thread384-192610 )by someone on this very same topic had some good responses out of which I could relate to Spongebob007 's reply the best. I can extract Natural Frequencies using FEA software. For simple shock tests (such as 40g over 10 ms)could I not make...

You should be able to read an Inventor file directly into Designstar. If not, try using SAT file format rather than STEP. All the faces that are supposed to be touching should have a proper 'coincident' mate. There should not be any interfernce between any component whatsoever.

Why go after VonMises if you have a strain gage ? Why not align your gage in the direction in which FEA normal stresse/strains are available? and compare the strains with normal strains from FEA as "nazariosr" advised?

Any updates on this rpm63? I am fairly new to this forum. 52 postings !!! Am I to assume all that discussion finally amounts to nothing. wish there was a conclusion to this.

EdR: Where you have a 30% difference, wouldn't it be better to use the Flexural Modulus if the actual loading is also predominantly bending ?

EdR, You are right about metals and some plastics. But PTFE, for example has a Flex. Modulus almost 30% higher than Tensile Modulus. (2.7 Gpa vs 1.9 Gpa) Sometimes it is lower too. I wouldn't be concerned about 5 or 10% difference. I guess the short answer is 'you just have to find it'. Don't...

Many plastics do not have their Elastic Modulus listed but their Flexural Modulus is. (obtained from a bending test as opposed to a tensile test). Does anyone have any experience in using Flexural Modulus value in place of Elastic Modulus for Material properties. My question really is how well...

ANSYS, NASTRAN, COSMOS - I don't see a big difference in their capabilities- in terms of what a user can get out of them. They all are General purpose FEA packages. Linear analysis and run of the mill non-linear problems (including contact, small strain plasticity etc) COSMOS should do just...

Load direction update is not an issue for such a small deflection. My question is, where exactly is your force applied?- at the corner or in the middle. As English Muffin pointed out, transverse deformation does play a role. I set up an FEA model with the info that RPM63 gave. I actually got...