What MAT LAW should be used for plastic in Radioss?
Hi guys,
I want to simulate a drop test with my plastic part.
And I don't know what should mat law should I used for it.
I have stress strain curve csv file like below.
Thank you!
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Hi, LAW36 (PLAS_TAB) should be ok for this: It needs True Plastic Stress vs Strain (ratio) as input
I've assumed your data above is engineering stress vs strain(%)?
Converting to True Plastic Stress vs Strain for LAW36:
Offset stress/strain to 0,0 and divide strain by 100
True Strain: Take Natural Log of 1 + Eng Strain
True Stress: Eng Stress * Exponent (Eng Strain)
Estimate Elastic Modulus (E)
Plastic Strain = True Strain - True Stress/E
As Material: also attached as file (I have set density as 5g/cm^3 and poissons ratio as 0.3), you may modify those if you have better data
Hope this helps
Hi Paul,
Thank you for your great explain.
I've applied your method and successfully created data for material.
But can I have a more question that, do you know how to convert material from .csv file using tcl scripts.
Best regards,
James
Altair EmployeeHi Paul,
Thank you for your great explain.
I've applied your method and successfully created data for material.
But can I have a more question that, do you know how to convert material from .csv file using tcl scripts.
Best regards,
James
There is a specific tool 'Altair Material Modeler' that is an interface for Compose,
it does everything for you... but it is not 'free' (draws license units)
There is a specific tool 'Altair Material Modeler' that is an interface for Compose,
it does everything for you... but it is not 'free' (draws license units)
That really helpful, thank you!
Altair EmployeeHi, LAW36 (PLAS_TAB) should be ok for this: It needs True Plastic Stress vs Strain (ratio) as input
I've assumed your data above is engineering stress vs strain(%)?
Converting to True Plastic Stress vs Strain for LAW36:
Offset stress/strain to 0,0 and divide strain by 100
True Strain: Take Natural Log of 1 + Eng Strain
True Stress: Eng Stress * Exponent (Eng Strain)
Estimate Elastic Modulus (E)
Plastic Strain = True Strain - True Stress/E
As Material: also attached as file (I have set density as 5g/cm^3 and poissons ratio as 0.3), you may modify those if you have better data
Hope this helps
Hi, LAW36 (PLAS_TAB) should be ok for this: It needs True Plastic Stress vs Strain (ratio) as input
I've assumed your data above is engineering stress vs strain(%)?
Converting to True Plastic Stress vs Strain for LAW36:
Offset stress/strain to 0,0 and divide strain by 100
True Strain: Take Natural Log of 1 + Eng Strain
True Stress: Eng Stress * Exponent (Eng Strain)
Estimate Elastic Modulus (E)
Plastic Strain = True Strain - True Stress/E
As Material: also attached as file (I have set density as 5g/cm^3 and poissons ratio as 0.3), you may modify those if you have better data
Hope this helps