During the Spring '07 semester, I plan to teach:
MAE 495/595 (3 hrs.) - "STARS" (Strategically Tuned Absolutely Resilient Structures)
MAE/CE 677 (3 hrs.) - "Optical Techniques in Solid Mechanics"
The descriptions for these courses follow:
MAE 495/595 - 3 hrs.
"STARS" (STRATEGICALLY TUNED ABSOLUTELY RESILIENT)
STRUCTURES
Prerequisite: Permission of instructor.
Time and place: Friday 11:15 a.m. - 1:55 p.m.; TH S117
The STARS concept makes it possible to build a structure capable of storing potential energy in the form of elastic deformation that can be released in a controlled fashion in the form of work or kinetic energy. The composite section must be designed based on the strength, stiffness, and the position of the component materials. The ability to store and release energy depends upon a complex interaction between the shape, modal response, and the forcing function initiated to the structure. Since the method relies on energy recovery through elastic deformation, steps must be taken to prevent damage so that the structure is absolutely resilient.
The
course will include lectures and independent study in this exciting new area.
Topics will range from proof of principle to practical application.
Specific areas to be addressed include composite section design,
structural analysis, stress analysis, integrated sensing, non-destructive
evaluation, finite element modeling, and modal analysis.
Grading
and Attendance Policies:
Sixty-five
percent of the grade will be based on attendance and homework assignments.
Grades received for attending class periods and those received for
homework assignments will be averaged; students will earn 100 points for being
in class and zero points for not being there; homework assignments including a
class log will be scored on the basis of 100 points each.
The remaining thirty five percent of the grade will be based on a final
oral presentation scored collectively by the instructor and fellow class
members. Students are encouraged to
update their class log on a weekly basis and must show satisfactory progress in
guided readings and laboratory work where applicable.
Course Outline:
Introduction to STARS; Review of Statics and Mechanics of Materials - Forces, Moments, Stress, Strain, and Displacement. Homework assignment includes formulating shear and moment diagrams and calculation of maximum bending and shear stresses in prismatic beams subjected to transverse loading.
Overview of Solid Mechanics - Equilibrium, Compatibility, Strain-Displacement, Transformation, and Constitutive Equations. Homework assignment concentrates on deflection criteria and derivation of the elastic curve for prismatic beams subjected to transverse loading.
Design Strategy for Producing STARS - Stiffness, Strength,
Geometry, Forcing Functions, Adaptive Reinforcement, Embedded Sensors,
Control Elements, and Moire Measurement Techniques.
Discussion focuses on highly compliant structures with an example
given (collapse of
Visualizing Stress Transfer in STARS via Photoelasticity - Design of STAR Structures, Transform Section Theory, Plane and Circular Polariscopes, Isoclinic and Isochromatic Fringe Patterns, Calibration and Compensation Techniques; and Stress Concentration Factors. Homework assignment involves comparing experimentally determined stresses in composite photoelastic models with results obtained from the transform section theory and showing how stress transfer can be accomplished by adjusting the compliance of the materials in a composite section.
Concrete Mixture Design - Binders, Aggregates, Additives, Mix Proportioning, and ASCE Concrete Canoe Competition. Homework geared toward improving UAH design report.
Design of Composite Structures - Design Considerations, Composite Laminates, Inter-Laminar Stresses, Woven Composite Structures, and Structural Failure.
Numerical and Experimental Characterization of STARS - Modified Transform Section Theory, Equivalent Composite Properties, Parametric Study of Electrical Resistance Strain Gages, Rosettes, Circuitry, and Application to STARS. Homework involves appreciating how the constitutive equations are affected by material properties such as the elastic modulus, Poisson’s ratio, and the shear modulus.
Vibration Analysis - Discrete Systems, Continuous Systems, Modal Analysis, Resonance, Eigenvalues, and Mode Shapes.
RRAPDS - Remote Readiness Asset Prognostics/Diagnostics System, Strategic Defense Applications, Remote Sensing, MEMS, Accelerometer Measurements, and Application to STARS.
Dynamic Characterization of STARS - Modal Analysis of Graphite Reinforced Cementitious Composite Plates, Dynamic STAR Structures, Experimental Testing, and Finite Element Analysis.
Stress Analysis - Method of Attack, Conventional Measurement Techniques, Advanced Optical Methods, Sensors, and Transducers.
Advanced STARS Concepts - Embedded Sensors, Control Elements, Structural Morphing, Self Healing, etc.
MAE/CE 677 - 3 hrs.
OPTICAL TECHNIQUES IN SOLID MECHANICS
Prerequisites: MAE/CE 477/577 or permission of
instructor..
Time and place: Friday 8:00 a.m. - 10:40 a.m.; TH S117
Experimental mechanics and applied optics have been synthesized through recent developments in laser and computer technology. This course presents techniques which are valuable complements to the design and analysis process; and, in some difficult or complex situations, provide the only practical approach to a real solution. The course begins with a review of the more conventional methods used for experimental stress analysis (photoelasticity, brittle coatings, electrical resistance strain gages, etc.) but eventually concentrates on more recent developments in the field (moire interferometry, speckle metrology, holographic interferometry, etc.). Non-destructive, laser-based testing methods are emphasized with particular attention paid to fiber optic recording systems and computerized data reduction techniques, including a hybrid approach designed to interface experimentally measured data with finite element programs. The MAE Applied Optics Laboratories provide a mechanism for valuable hands on exposure to complement analytical formulations developed in class. The class offers a unique learning experience in the rapidly expanding fields of engineering mechanics and applied optics.
Grading:
Homework and Laboratories = 40%; Oral Presentation = 30%; Written Presentation = 30%
Course Outline:
Review of Fundamentals - Stress, Strain, and Displacement. Transformation Equations, Conservation Principles, Strain-Displacement Relations, Compatibility Equations, and Constitutive Laws.
Light - Interference, Refraction, and Stress Optic Law.
Conventional Measurement Techniques - Photoelasticity, Brittle Coatings, and Strain Gages.
Moire Analysis - Fundamentals, Geometrical Relationships, Strain-Displacement Relations, In-Plane Measurement, Out-of-Plane Measurement, and Shifting Techniques. Photographic Methods.
Optical Filtering - Optics and Diffraction Theory.
Fiber Optic Sensing - Theory, Monomode and Multimode Fibers, Coherent and Incoherent Bundles, Extrinsic and Intrinsic Sensing, Optical Fiber Interferometry.
Photoelectronic-Numerical Processing - Digital Acquisition and Processing Systems.
Moire Interferometry - Fundamentals, Geometrical Relationships, Mold Generation, Transfer Process, and Analysis. Diffractive Optic Interferometry and Recent Advancements.
Holography and Holographic Interferometry - Holograms, Double Exposure Holographic Interferograms, Real-Time Recording, Time Average Studies, Image Plane Holography, and Ultra Low Frequency Techniques. Holographic/Fiber Optic Systems.
Speckle Metrology - Subjective Speckle, Objective Speckle, Artificial White Light Speckle, Speckle Interferometry, and Speckle Photography. Digital Correlation and Remote Speckle Metrology.
Hybrid Techniques - Incorporation of Experimental Data into Finite Element Models.
Flow Visualization - Laser Doppler Velocimetry, Laser Speckle Velocimetry, Optical and Digital Correlation Techniques.
Radial Metrology - Panoramic Imaging Techniques, Panoramic Annular Lens, Inspection, Amplitude and Phase Measurements, Stereoscopic Imaging.