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ZERO OR NEGATIVE VOLUME FOR 3D-ELEMENT

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My calculation was stopped because of this error :


 


MESSAGE ID :          166

 

 ** STOP : ZERO OR NEGATIVE VOLUME FOR 3D-ELEMENT ID=1072061

 

 

any idea plz ?


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Hi Mirino,


 


could you please share the file through the dropbox link in my signature below?


 


I cannot access the dropbox link you have given.


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Hi Prakash, I am asked in this exercise to verify whether or not the bullet penetrates the plate. If a penetration occurs, I would say that the bullet ultimately penetrates. However, it is not normal that the analysis does not run.


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Hi Mirino,


 


can you make the bullet rigid?


 


Make it to MAT/ELAST and check if you are happy with the results.


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Hi Prakash, I corrected the penetration there was in my model.


 


I used for both the bullet and the plate the Johnson-Cook material.


 


The plate has a thicnkess of 0.5mm with:


 


plasticty yield stress of 235 MPa;


plasticty maximum stress of 360 MPa


 


Due to the small thickness, I thought the bullet would pierce the plate. On the contrary, I have this strange behaviour as you can see looking at the pictures I have attached (displacement in millimeters). (This is https://www.dropbox.com/s/36ic9m7dmqc34vv/proiettile_06.hm?dl=0 the file .hm and this the file .h3d https://www.dropbox.com/s/fozixsq1kptudwq/proiettile_06.h3d?dl=0 )


post-37159-0-28552500-1434472146_thumb.p

post-37159-0-37759600-1434472149_thumb.p

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Hi Mirino,


 


Are you expecting rupture of the elements in the plate?


 


If yes, please have a look at the RADIOSS Example 26 - Ruptured Plate


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