156 / FIELDS OF INSTRUCTION plex variable methods. Three-dimensional problems including torsion, bending, stress concentration, thermal stress, and stress-wave propagation. ESM 655-INTRODUCTION TO THEORY OF THERMAL STRESSES. 3 credits Prerequisite: ESM 534. Theory of thermal distortion and induced thermal stresses. Strain energy principles. Two- and three-dimensional problems. Creep. Thermal instability. ESM 656-THEORY OF THERMAL STRESSES. 3 credits Prerequisites: ESM 654, ESM 655. Uncoupled and coupled thermoelastic theory. Formulations of thermoelastic problems. Thermal stresses in structural ele- ments. Thermoelastic stability. Analysis of thermal stresses in inelastic systems. New trends of analysis. ESM 660-PROPERTIES OF MATERIALS. 3 credits Prerequisite: ESM 533. Mechanical and thermodynamic analysis of the proper- ties of materials. Creep, fatigue, stress relaxation characteristics; thermal cycling response; mechanical properties at elevated temperatures. ESM 667-THEORY OF ELASTIC STABILITY. 4 credits Prerequisite: ESM 635 or ESM 674. Stability criteria. Elastic stability of: bars; frames; plates; cylindrical, conical, spherical, and shallow shells. Postbuckling be- havior of plates. Plates and shells under dynamic loading. ESM 670-INTRODUCTION TO INELASTIC BEHAVIOR OF MATERIALS. 3 credits Prerequisites: ESM 303 or ESM 305; MS 501. Fundamental inelastic theory in- cluding plasticity and viscoelasticity. Applications to beams, bars, rings, and plates. Dynamic inelastic effects. Problems in creep and stress relaxation. ESM 671-THEORY OF THE INELASTIC CONTINUUM. 3 credits Prerequisites: ESM 601, ESM 670. Stress and strain in inelastic media. Flow, deformation, and incremental theories. Ideally plastic media. ESM 673-THEORY OF PLATES. 3 credits Prerequisite: ESM 601. Fundamental equations for the bending and stretching of thin plates with small deformations. Large deformations of plates with non- linear considerations. Energy methods applied to plate problems. Thermal stresses in plates. ESM 674-THEORY OF SHELLS. 3 credits Prerequisite: ESM 673. General theory of deformation of thin shells. Static analysis of shells, shells of revolution, dynamics of shells. ESM 675-METHODS OF ANALYSIS FOR PLATES AND SHELLS. 3 credits Prerequisite: ESM 674. Application of various approximate shell theories to engineering problems and the methods of solution. Numerical analysis of shells. ESM 676-INERTIAL GUIDANCE AND CONTROL. 3 credits Identical with EE 676. Prerequisite: EE 670. Modern navigational and vehicle guidance and control techniques based on use of inertial reference. ESM 677-MATHEMATICAL THEORY OF CONTROL SYSTEMS 1. 3 credits Prerequisite: EGC 630. Functional analysis of structure of linear dynamical systems. Discrete and continuous, lumped and distributed parameter systems. Appli- cation of the theory of minimum-normed operators to optimal-control-system problems. Projection theorems with applications in optimal control and estimation. ESM 679-NONLINEAR CONTROL SYSTEMS. 3 credits Identical with EE 679. Prerequisite: EE 570. Stability of nonlinear systems using Liapunov's second method, the Popov and other frequency domain criteria. ESM 682-THEORY OF VISCOELASTICITY. 3 credits Prerequisites: ESM 601, ESM 670. Theories of solid and fluid materials which