Plate Impact Based On Johnson Cook Parameters

Transcript

Finite Element Analysis (FEA) Tutorial Project: Impact Loading using the Johnson-Cook Plasticity-Damage Model Problem • Analyze the impact loading of an object on aluminum plates using FEA tool ABAQUS Plate Dimensions: t= 26.3 mm w=304 mm L= 304 mm Projectile Dimensions: d= 12.9 mm lp= 88.9 mm lp L=304 mm • • Determine: Plot d t= 26.3 mm Problem • Analyze the impact loading of an object on aluminum plates using FEA tool ABAQUS Plate Dimensions: t= 26.3 mm w=304 mm L= 304 mm Projectile Dimensions: d= 12.9 mm lp= 88.9 mm lp L=304 mm • • Determine: Plot d t= 26.3 mm Preprocessing Creating The Geometry • Open ABAQUS/CAE and create a new parts:  – Aluminum Plate  – Projectile Creating The Geometry • Aluminum Plate Creating The Geometry • Projectile Material Properties • Aluminum Plate and Projectile Model Part Young Modulus (MPa) Poisson Ratio Density (Tonne/mm^3)  Aluminum Plate 69000 0.35 2.7E-009 Projectile 202000 0.3 8.6E-009 Material Properties • Aluminum Plate and Projectile Plastic Data Johnson-Cook Plasticity A [Mpa] B [Mpa] n m C  Aluminum Plate 262 162.1 0.2783 1.34 - - Projectile 1430 2545 0.7 1.03 0.014 15.0 ε0 [1/s] Material Properties • Aluminum Plate Johnson-Cook Dynamic Failure Model Material d1 d2 d3 d4 d5 Melting Temperature (°C) Transition Temperature (°C) Reference Strain Rate 1/s  Aluminum Plate -0.77 1.45 0.47 0 1.6 651.85 20.05 1 1 ABAQUS Material Definition 4 3 5 2 ABAQUS Material Definition • • Add Damage Evolution Set the displacement at failure to 0.9 Creating an Assembly • • Double click on instances Set the projectile 100 mm from the origin (center of the plate ) Interactions properties • Double click in interaction properties, select contact. Select Mechanical, Normal Behavior Interaction properties continued • Select the default set and click OK Interactions • Double click on Interactions, General Contact, All with self and add the created IntProp-1 in individual property assignment Creating Mesh (partitioning) Aluminum Plate • Create a Partition of the plate • Seed edges and select the partition lines Creating Mesh (Continued) • Repeat the procedure in the opposite directions for the rest of the internal lines Creating Mesh Creating Mesh Projectile • Create a Partition of the projectile • Select an the approximate global size Creating Mesh • From Mesh Element Type Select Element Deletion for the Plate and the projectile Creating a Step • • Double click Steps under Model tree and Create step window will pop up This time you will modify the time period Field Output Request • Select SDEG scalar Stiffness degradation and Status as output variables Boundary Conditions Results with v3 =-700000 and displacement at failure 0.9 Time t0 Time t2 Time t1 Time t3 Results Time t4 Time t6 Time t5 Time t7 Results Time t8 Time t10 Time t9 Time t11 Results Rebound of the projectile • • Change the value of predefined velocity field Delete the damage evolution in Materials Aluminum Plate Boundary Conditions Delete the Damage Evolution Results Time t0 Time t2 Conduct simulations • • • Change the values of displacements at failure from 0.1 to 0.9 and keep damage evolution. Comment on the results for Von Mises stress, the morphology of the plate and the hole, the trajectory of the projectile and the velocity Improve the model using your favorite meshing technique to refine the center of the plate or reduce the geometry to the half or a quarter.