Definition of signed von mises stress and usage

Altair Forum User

Hi,

 

Question 1)

In hyperview for 'signedvon mises stress' what is the method of obtaining the sign? 

As an example,

1). Is the signing done using according to principle stresses or

2) Signing done by the sign of the first stress invariant.

 

I looked in the hyperview help file but couldn't find any proper definition.

 

Question 2)

I'm trying to use the sign of von misses stress to find if a component is in compressive or tensile strength.  So please also let me know if using sign von mises stress is the correct way. 

 

Thank you.

 

 

Q.Nguyen-Dai

I don't know exactly the formula to compute the sign. I would like to know too if someone could tell us?

But I think you can interpret as 'tensile dominant' for 'positive VM stress' area, and as 'compressive dominant' for 'negative VM stress' area.

Altair Forum User

 

 

Q.Nguyen-Dai

I think there's nothing to see with fatigue analysis here.

 

Altair Forum User

Altair Forum User said:

I don't know exactly the formula to compute the sign. I would like to know too if someone could tell us?

But I think you can interpret as 'tensile dominant' for 'positive VM stress' area, and as 'compressive dominant' for 'negative VM stress' area.

Nguyen-Dai ,Thank you for your reply. I'm also trying to find a solid reason since for the study I'm doing it is essential to find if the stress is tensile dominant or compressive dominant.

 

Altair Forum User said:

 

 

Prakash Pagadala, Thank you for your reply. Indeed I'm also doing a fatigue simulation and to verify the results I use Hyperview to view signed von mises stress. Also I'm aware that both positive and negative stresses are used. Will it be possible to know the actual basis of signing used in HyperView?

 

Thanks in Advance.

Q.Nguyen-Dai

@Rashi Here's the answer from Altair.de:

Altair Forum User

Altair Forum User said:

@Rashi Here's the answer from Altair.de:

<?xml version="1.0" encoding="UTF-8"?>

@Nguyen-Dai  Thank you very much for the answer! Cheers!

 

Altair Forum User

@Q.Nguyen-Dai Will it be possible to get the link for this web page?

Q.Nguyen-Dai

HV Docs:

<?xml version="1.0" encoding="UTF-8"?>

GAJENDRA KUMAR NHAICHANIYA

Thanks for clarifications. Had same doubt.