MAT107_MODIFIED_JOHNSON_COOK
Amir mahdi hajizadeh
James M. Kennedy
Dear Amir,
See if this presentation is of some help:
Ballistic performance of vehicle armor layered metallic plates was investigated. The modified
Johnson-Cook material model (*MAT_107) was used (data included) for all material parts. The
simple Cockroft-Latham failure model was employed for failure. Element type and hourglass
formulations were studied for their effect on results accuracy. A mesh sensitivity study was
done for four different mesh sizes. The element size was changed through the thickness
direction with residual velocity comparisons made:
Basaran, G., and Gurses, E., "Numerical Study of High Velocity Impact Response of Vehicle
Armor Combination Using LS-DYNA", 11th European LS-DYNA Users Conference, Salzburg,
Austria, May, 2017.
Sincerely,
James M. Kennedy
KBS2 Inc.
April 29, 2021
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James M. Kennedy
p.s.
Flores-Johnson, E.A., Saleh, M., and Edwards, L., “Ballistic Performance of a Multi-Layered
Metallic Plates Impacted by a 7.62-mm APM2 Projectile”, International Journal of Impact
Engineering, Vol. 38, Issue 12, pp1022-1032, December, 2011.
https://www.sciencedirect.com/science/article/abs/pii/S0734743X11001357
From: James M. Kennedy [mailto:j...@kbs2.com]
Sent: Thursday, April 29, 2021 6:26 PM
To: 'Amir mahdi hajizadeh' <amirmahdihaj...@gmail.com>; 'LS-DYNA2' <ls-d...@googlegroups.com>
Subject: RE: [LS-DYNA2] MAT107_MODIFIED_JOHNSON_COOK
Dear Amir,
See if this presentation is of some help:
Ballistic performance of vehicle armor layered metallic plates was investigated. The modified
Johnson-Cook material model (*MAT_107) was used (data included) for all material parts. The
simple Cockroft-Latham failure model was employed for failure. Element type and hourglass
formulations were studied for their effect on results accuracy. A mesh sensitivity study was
done for four different mesh sizes. The element size was changed through the thickness
direction with residual velocity comparisons made:
Basaran, G., and Gurses, E., "Numerical Study of High Velocity Impact Response of Vehicle
Armor Combination Using LS-DYNA", 11th European LS-DYNA Users Conference, Salzburg,
Austria, May, 2017.
Sincerely,
James M. Kennedy
KBS2 Inc.
April 29, 2021
From: ls-d...@googlegroups.com [mailto:ls-d...@googlegroups.com] On Behalf Of Amir mahdi hajizadeh
Sent: Thursday, April 29, 2021 5:47 PM
To: LS-DYNA2 <ls-d...@googlegroups.com>
Subject: [LS-DYNA2] MAT107_MODIFIED_JOHNSON_COOK
Hello
--
James M. Kennedy
Dear Amir,
E0DOT - Quasi-static threshold strain rate (𝜀̇0 = 𝑝̇0 = 𝑟̇0); see Equation (107.12) = 5.0e-4
See description for EPS0 in *MAT_015.
ALPHA – thermal expansion coefficient (𝛼) = 1.1e-5
Sincerely,
James M. Kennedy
KBS2 Inc.
April 30, 2021
From: ls-d...@googlegroups.com [mailto:ls-d...@googlegroups.com] On Behalf Of Amir mahdi hajizadeh
Sent: Thursday, April 29, 2021 5:47 PM
To: LS-DYNA2 <ls-d...@googlegroups.com>
Subject: [LS-DYNA2] MAT107_MODIFIED_JOHNSON_COOK
Hello
--
