Blast loading of a circular plate using the CONWEP model

This problem contains basic test cases for one or more Abaqus elements and features.

The following topics are discussed:

ProductsAbaqus/Explicit

Elements tested

S3R

S4R

Features tested

Dynamic response to blast loading using the CONWEP model.

Problem description

A circular plate is subject to blast loading as a result of detonation of 50 kg of TNT 0.5 m directly above the center of the plate. The plate has a radius of 1 m and a thickness of 0.05 m. One-quarter of the plate is modeled using shell elements, with fully built-in boundary conditions applied along the circular edge and symmetry boundary conditions at the symmetry planes. Air blast CONWEP loading is applied on the top surface of the plate. The density of the plate material is 7850 kg/m3, and the elastic material properties are Young's modulus of 210 GPa and Poisson's ratio of 0.28. The plastic behavior is modeled with a strain-rate insensitive isotropic hardening bilinear model, with yield stress of 1000 MPa and hardening modulus of 2 GPa. A dynamic analysis is performed for a period of .004 seconds.

Results and discussion

The history of the deflection at the center of the plate modeled using either S3R or S4R elements follows closely the result reported in Neuberger et al. (2007). In addition, the history of the Mises stress at the SNEG location of the shell element at the plate center is consistent with the history of the effective stress given in the above reference.

Input files

airblast_s3r_circular_plate.inp

Circular plate modeled with S3R elements.

airblast_s4r_circular_plate.inp

Circular plate modeled with S4R elements.

References

  1. Neuberger, A., S. Peles, and D. Rittel, “Scaling the Response of Circular Plates Subjected to Large and Close-Range Spherical Explosions. Part I: Air-Blast Loading,” International Journal of Impact Engineering, vol. 34, pp. 859–873, 2007.