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**Contact Pair, interaction=IntProp-1, mechanical constraint=KINEMATIC, cpset=Int-1 *Contact Pair, interaction=IntProp-1, mechanical constraint=KINEMATIC, cpset=Int-1īy commenting them out, these lines become: Finally, the following two lines need to be commented out under the ** INTERACTIONS section: Notice that the "surf1" set created in the previous step is referenced here.ģ. *contact controls assignment, nodal erosion=no Right after the *Bulk Viscosity keyword (including 0.06, 1.2), the following lines need to be added: Also, a new set is created called surf1 that will be referenced in the next modification.Ģ. Recall that the projectile and plate have 12 elements, respectively. Notice that Set-1 is a set composed of all the elements of the projectile (Part-1-1) and the plate (Part-2-1). *Elset, elset=Set-1, instance=Part-2-1, generate *Elset, elset=Set-1, instance=Part-1-1, generate Immediately before the *End Assembly keyword, the following lines need to be added: Two of the modifications are keywords that need to be added, while the third one is just commenting out two lines.ġ. There are 3 sections in the input that need to be modified. The resulting input file can be obtained here. The second set, called "Set-2", is composed of a single node at the top of the penetrator to allow one to track its velocity.Īt this point, we are ready to export the input file and manually edit it. This particular set is important and necessary, as it will be used when adding the extra lines to the input file to allow the erosion on the plate. The first one, called "Set-1", includes both parts. For the projectile, this was left as "default".įinally, two sets are created on the "Assembly" module. Also, in the element type window, Element Deletion was turned on for the plate part.
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The resulting mesh has 36652 elements for the plate and 135 elements for the projectile. The number of elements for each part is chosen so that the plate has at least 4 elements through its thickness. The mesh consists of C3D8R elements, 8-node linear hex bricks, with reduced integration and enhanced hourglass control. The lines that are specifically modified to allow this behavior are mentioned in the Input File section. To achieve this behavior, interior surface specifications have to be manually added to the input file because Abaqus/CAE does not support this feature. These definitions are modified to allow the projectile to erode the plate upon penetration. Because of the relatively small thickness of the plate, a friction coefficient of zero is assumed. In the initial setup of the problem, surface-to-surface contact is specified between the projectile (first surface) and the plate (second surface), which controls the tangential and normal behavior between them. This velocity is applied during a dynamic and explicit step lasting 3.0e-4 seconds. A predefined velocity of 36,000 inches per second in the direction of the target is specified for the penetrator, which is offset 0.01-in. Moreover, the outer circumferential face of the plate is restricted so that it does not rotate or displace. Given that this is a quarter symmetry problem, symmetric boundary conditions are specified in the two faces of both parts that are aligned with the two planes of symmetry. All of the information used to specify these parameters are obtained from Johnson and Cook for the 4340 steel, and from Seidt et al for the A36 steel. This approach is consistent with Iqbal et al. The A36 steel plate has additional information for its Johnson-Cook damage model, which makes use of a linear damage evolution based on a zero fracture energy. These include their density, isotropic modulus of elasticity, Poisson's ratio, and a rate-dependent plasticity that uses Johnson-Cook hardening parameters. Although both parts are composed of different materials, most of the same parameters are used to define their material behaviors. The FEA model has two deformable solids subjected to a dynamic event and solved using explicit integration. To minimize the number of elements in the problem, a quarter symmetry was assumed. The target is 0.2450 inches thick, has a radius of 6.0 inches, is fixed in space, and is composed of A36 steel. The penetrator is 0.58 inches long, has a radius of 0.2475 inches, is traveling at a speed of 3,000 fps, and is composed of 4340 steel. This problem consists of a cylindrical object (called penetrator or projectile) impacting a disk (called plate or target).