Drop test at low temperature

[shahidmehmood]

Dear All,

I would like to study the drop behaviour of Polypropylene at -30oC from a height of 1.2 m. I have two questions in my mind:

Q 1: Is the Johnson/Cook model is the right choice for my kind of application? I have seen many people using this model in their publications. But my concern is that is it good model for Polypropylene as it is thermoplastics? I have checked the material models from Abacus and in their matreial data base they say it is good for metals only. I can see in this model that it takes into consideration effects of strain rate, temperature and hardening.

Q2: What kind of tests I have to perfrom to get material data for my model: tensile, compression etc and at what temperature these tests have to be conducted? Is it possible that I perform my test at room temperature and at a particular strain rate and then enter this data and my model will take into consideration the variation of temperature and strain rates based upon my boundary conditions etc. I reallly donot understand how it works?

I would be thankful if anyone could write me about my matter.

Thanks very much

Best Regards

Shahid

 

[Pud]

A good "model" for PP at -30C would be glass. It is brittle at around -5C (PPCP).

H

http://www.tynevalleyplastics.co.uk

It seems to me you have confused a safe drinking limit with what I like to call "lunch"