Center for Composite Materials - University of Delaware

Research Summary

Modeling the Depth of Penetration of Very Thick Composites

Authors: I. Biswas & B. Z. (Gama) Haque

DOP PARAMETERS & CONCEPT

DOP EXPERIMENTAL METHODS

DoP Experiments can be done by mounting a very thick composite plate on a rigid support and impacting with a RCC or FSP projectile. Projectile-Target Pair is .50cal FSP-PW S2 Glass/SC 15

Fig 3: Cross-Sectional View of the Projectile (207 Grain 0.50cal FSP)-Target Pair
after the DoP Experiment at Different Impact Velocities

EXPERIMENTAL RESULTS

DoP experiments are conducted in the impact velocity range 200<V_I<1400 m/s using four different projectiles, i.e., 16 & 64 grain RCC, and 44 (0.30cal) & 207 (0.50cal) grain FSPs
At higher impact velocity the projectile deformation is significant and the data showed non-linear behavior
The penetration depth as a function of impact velocities are presented in the figures.
The experimental data is curve fitted using the Linear and Quadratic models

Fig 1: DoP Experimental Data and Analysis for PW S-2 Glass/SC15 Composites

FINITE ELEMENT MODEL

COMPARISION BETWEEN EXPERIMENT & FEA

• Based on the rigid assumption of the projectiles, the penetration depths versus impact velocities predicted by the FEA appear to be linear
• These linear predictions qualitatively matched the experimental results for FSPs, however, failed to predict the same for the RCCs which consistently exhibited reduced depth of penetration at the higher impact velocities

FINITE ELEMENT ANALYSIS

Time history of projectile rigid body velocity and penetration resistance force shows exponential behavior

SUMMARY

• DoP Experiments have been Conducted for Four Different Projectiles i.e., .50cal & .30cal FSP and 64 & 16-Grain RCC on PW S-2 Glass/SC 15 Thick Composite Plates
• The DoP Parameters for Linear & Quadratic DoP Models have been Determined from Fitting the Experimental Data
• FEA of DoP Experiments has been Conducted Using an Elastic Projectile with Progressive Composite Damage Model MAT162
• FEA Data Matches Well in Case of Lower Impact Velocities, & for High Velocity Impact, Plastic Deformation of the Projectiles need to be Considered
• Parametric Simulations will be Conducted in Future to Determine Optimum Projectile Elastic-Plastic Parameters

ACKNOWLEDGEMENT

• Funding from the following sources are acknowledged
• ARL-CART
• OWENS CORNING
• Thanks to Philip Schweiger for his help with the DoP Experiments

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