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Airframe Stress Analysis and Sizing
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Provider:
UCLA Extension
Topic(s):
Technical/Engineering
Full Seminar Description
Most airframes deal with thin-sheets or shells that may have buckling and crippling characteristics. This course provides a comprehensive background in metallic airframe sizing that combines input from both material strength analyses and hands-on design experience. Practical airframe design depends extensively on experimental or test data that must be correlated with analytical procedure. Discussion focuses on the selection of structural configurations and materials that combine to produce an economic design, while at the same time taking into account the effects of static, fatigue, fail-safe requirements, damage tolerance, and repairability. Substantial information and data for metallic airframe sizing is presented in tables, charts, and/or curves based on past experience and/or test results. 2.4 CEUs. Fee per person: $2415Most airframes deal with thin-sheets or shells that may have buckling and crippling characteristics. This course provides a comprehensive background in metallic airframe sizing that combines input from both material strength analyses and hands-on design experience. Practical airframe design depends extensively on experimental or test data that must be correlated with analytical procedure.
Discussion focuses on the selection of structural configurations and materials that combine to produce an economic design, while at the same time taking into account the effects of static, fatigue, fail-safe requirements, damage tolerance, and repairability. Substantial information and data for metallic airframe sizing is presented in tables, charts, and/or curves based on past experience and/or test results.
The sizing methods presented in this course also are intended for those who need rough estimation techniques to support preliminary structural design. Moreover, these methods can give quick and accurate solutions to design problems simply with the aid of a desktop engineering calculator.
Homework assignments are given everyday in class. Participants must bring a small desktop engineering calculator.
UCLA Extension has presented a five-day version of this highly successful short course since 1993.
Prerequisite
Some basic understanding of strength of materials is required.
Course Materials
The text, Airframe Stress Analysis and Sizing, Second Edition, Michael C.Y. Niu (Conmilit Press, 1999), and lecture notes are distributed on the first day of the course. The notes are for participants only and are not otherwise available for sale or unauthorized distribution.
Daily Schedule
Monday
General References
Overview
Discussion of preliminary sizing, structural design phases, design criteria and regulations for certification, detail design and stress analysis, design guidelines.
Loads
Structural external and internal loads, static and dynamic load, wing and empennage loads, fuselage loads.
Material Properties
Hooke's law, stress-strain curves, material properties, material selection, grain directional effects, stress corrosion effects, fatigue and crack growth characteristic.
Structural Analysis
Determinate (non-redundant) structures, indeterminate (redundant) structures.
Sizing Procedures
Preliminary sizing requirements, production stress analysis, formal stress analysis for certification, rigidity requirements, margin of safety (MS) or reserve factor (RF).
Simple Beam
Beam bending, plastic bending, forced bending, stiffness (EI), shear stresses and shear flows, taper effect.
Tuesday
Box Beam
Beam in torsion (closed vs. open sections), single-cell enclosed sections, two-cell enclosed sections, panel stiffener effects, shear stresses, shear stiffness (GJ), taper effect.
Plate and Shell
Plates and shells applications, plate pressure bulkheads, shell pressure bulkheads, honeycomb panel application.
Joints and Fittings
Types of joint, fastener selection, under ultimate and fatigue loads, shim and eccentricity effects, lugs and shear pins, tension fittings and bolts, fatigue considerations, design concerns.
Wednesday
Column and Instability Buckling
Euler column equation, column end restraints, beam-columns, crippling stress, Euler-Johnson curves.
Buckling of Thin Sheet
Compression loads, shear loads, combined loads.
Flat and Curved Shear Panels
Shear resistant beams (non-buckled web), incomplete diagonal tension beams (buckled web).
Cutouts
Holes and cutouts, cutout in shear beam, panel with small hole, tension and compression panel with large cutout
Thursday
Compression Panels
Flat skin-stringer panels, integrally-stiffened panels, axial and shear load redistribution, sizing of the panel skin and stringers.
Damage-Tolerant Panels (In Tension)
Fatigue design considerations, stress concentration, crack growth and fail-fail.
Discussion of Transport Preliminary Wing Sizing
Upper panel (mainly in compression loads), lower panel (mainly in tension loads), spars, ribs, general discussion of design considerations and applications.
Discussion of Transport Preliminary Fuselage Sizing
Fuselage cabin pressure and flight loads, skin and stringers, frames, floors, general discussion of design considerations and applications.
Structural Test Setup
Strain gauges; component tests under compression load, shear load, and tension fatigue load; full-scale airframe static and fatigue test; test considerations.
Wrap-Up
Sponsor Background:
UCLA Extension is one of the largest providers of continuing education in the United States. For more than 40 years, it has presented quality technical and management short courses for engineers and managers seeking to keep abreast of new and rapidly changing technologies. The instructors -- drawn from academia, industry, and government -- are well-respected experts in their fields who present both theory and practice.The courses range from two-to-five days in length and attract participants from across the United States and Internationally. Subject areas include electrical, materials, and mechanical engineering as well as computer and communications engineering and technical management. Nearly 100 courses per year are held on the UCLA campus in Los Angeles. Many of them are also presented under contract at company locations across the country and abroad.
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