Altair Hypermesh Radioss Ballistic Impact Problem
I have a problem with the contact interface while simulating a ballistic impact problem, having a 30mm armor-piercing projectile impacting a 40mm RHA steel plate. Both the projectile and the armor plate is following the JC material and the JC failure model. So when it starts to penetrate the armor plate, the failure model elements are deleted, but after some time these elements are not deleted as the projectile is getting deformed. So as a result when it comes out from the other side there are some failure model elements are still presenting inside . so what will be the resason behind it . all the three parts are modelled by hexahedral elements and projectile is assigned as slave node and armour plate is assigned as master node using type 7 contact interface.
Best Answers
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Are you using /SURF/PART/ALL for the main surface? So that contact is calculated for the new faces when the elements are eroded? It is also necessary to set the idel flag on the contact (to 1 or 2) in order to have eroded elements surfaces removed from the contact at element erosion.
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I would select the projectile part with /SURF/PART/ALL as main, with all nodes of the plate as secondary, then do the reverse in a symmetric contact (/SURF/PART/ALL of plate to all nodes of projectile) making sure both contacts have idel flag set and a reasonable gapmin value for the element size/scale of model.
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Altair EmployeeAnswers
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suggesions please
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Are you using /SURF/PART/ALL for the main surface? So that contact is calculated for the new faces when the elements are eroded? It is also necessary to set the idel flag on the contact (to 1 or 2) in order to have eroded elements surfaces removed from the contact at element erosion.
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In my problem, I am using the master entity ID as defined by the contact surface by choosing the solid faces of the projectile, and the slave entity ID as defined by choosing the GRNOD for selecting all the nodes of the plate.
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so suggest me how do i establish the proper contact definition between the projectile and the plate
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I would select the projectile part with /SURF/PART/ALL as main, with all nodes of the plate as secondary, then do the reverse in a symmetric contact (/SURF/PART/ALL of plate to all nodes of projectile) making sure both contacts have idel flag set and a reasonable gapmin value for the element size/scale of model.
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Thank you; it solve my problem
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