Finite Deformations and Internal Forces in Elastic-Plastic Crystals: Interpretations From Nonlinear Elasticity and Anharmonic Lattice Statics by J. D. Clayton and D. J. Bammann ARL-RP-274 September 2009 A reprint from Journal of Engineering Materials and Technology, Vol. 131, pp. 041201-1–041201-15, October 2009. Approved for public release; distribution is unlimited.