A Comparison of LS-DYNA Composite Failure Models In a Dynamic Environment
Mr. William Gregory, Anteon Corporation
Mr. Christopher Key, Anteon Corporation
Dr. Im Lua, Anteon Corporation
Dr. Richard Cobb, Anteon Corporation

Abstract:

Five different LS-DYNA composite failure material models are compared against experimental dynamic testing results.  The LS-DYNA material models included *MAT_LAMINATED_COMPOSITE_FABRIC, *MAT_COMPOSITE_FAILURE_SOLID_MODEL, and *MAT_COMPOSITE_DAMAGE along with two user implemented *MAT_USER_DEFINED_MATERIAL_MODELS.  The two user defined material models consisted of a simple application of the Tsai-Wu quadratic failure criteria in a progressive failure scheme and the PFA (Progressive Failure Analysis) anisotropic damage model.  The experimental procedure involved testing solid laminate glass reinforced plastic (GRP) composite specimen of varying thickness under a dynamic load.  The testing subjected the solid laminate specimen to an air-backed, dynamic pressure load environment.  All of the composite specimens were fitted with strain gauges on both the dry and wet surface of the specimen.  Post test experimental analysis consisted of nondestructive UT evaluations to determine the damaged regions of the specimens.  Experimental strain results and UT failure regions are compared with the composite material failure models, from which conclusions are drawn and recommendations are made for the improvement of each model. This work was conducted under the auspices of the Shock Integrated Team (Shock IPT) of the NAVSEA 073R Composite Advanced Structures Program.  These studies support the current plan for shock qualification of the Virginia Class Advanced Sail (CAS).

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