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      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 
    • Rahul Ponginan

      Introduction to Explicit Analysis using RADIOSS.   11/02/17

      We are excited to announce the release of updated RADIOSS ebook, Introduction to Explicit Analysis using RADIOSS. We have added new tutorials, more FAQ's....etc with more topics covered. This study guide aims to provide a good introduction into the exciting and challenging world of explicit Finite Element Analysis.
      You can download the updated RADIOSS ebook here: Introduction to Explicit Analysis using RADIOSS                                                           
Harsh2610

MAT LAW

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I am doing tensile test of an HDPE Plastic material. I have only few material properties such as Young's modulus, Density, tensile strength etc. Which material law can be used in this case? 

I go through tutorial but I dont have the properties which are used in that tutorial.

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Hi,

I don't think its Young's Modulus.

Please  check open web resources on hardening parameters.

In the latest HyperWorks version (From 14 onwards) we can input the yield and UTS directly and the solver will directly calculate these parameters.

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On 2017/12/29 at 7:53 PM, George P Johnson said:

Hi,

I'm attaching an excel sheet for /MAT/LAW2.

Enter Ultimate Stress, Yield Stress and percentage elongation of the material so that it will calculate and will provide the b and n values. a is the yield stress value.

 

 

b&n_Law2.xlsx

 

Hi George,

Could you explain the background theory of this Excel sheet for /Mat/law2?

From this excel, n=0.45*elongation,b=(Ultimate-yield)/(n-(Ultimate/205000))^n      How this formula come from?   And what's the scope of the formula?

2018-01-05_095223.png.cc03cbee86da7e0f52689ddd0c9d4d15.png

 

Roy

 

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Hi George,

I'm sorry for the late reply.

I know the formula of Johnson-Cook model you showed. I just cannot understand the expressions in the Excel.

So how to understand this formula?

From this excel, n=0.45*elongation,b=(Ultimate-yield)/(n-(Ultimate/205000))^n

 

Roy

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Hi Roy,

This excel sheet was using long back , now we don't recommend this.

From RADIOSS version 14, you can directly input the tested values (Yield stress, UTS and strain at UTS), by switching on the I_flag to 1 and so this seems to be obsolete. 

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