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Structural Integrity of New and Aging Metallic Aircraft
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Provider:
UCLA Extension
Topic(s):
Technical/Engineering
Who Should Attend?
Structural, chemical, and materials engineers and managers
Full Seminar Description
This course presents both fundamental concepts and practical instruction in methods for fatigue, durability, and damage tolerance analysis/testing of metallic aircraft structures. The lectures emphasize the use of modern fatigue and fracture mechanics technology in the design of durable, damage-tolerant aircraft structures and the extended safe use of aging aircraft. The course opens with a discussion of basic fatigue and fracture behavior of structural metallic materials. With this background, the ensuing lectures detail the structural methods used in the aircraft industry to develop fatigue loading spectra, as well as fatigue life, crack growth, and residual strength analyses. The course also explores the application of this technology to verify the structural integrity and longevity of new aircraft, along with life monitoring, maintenance, and life extension of aging aircraft. 3.0 CEUs. Fee per person: $2745.This course presents both fundamental concepts and practical instruction in methods for fatigue, durability, and damage tolerance analysis/testing of metallic aircraft structures. The lectures emphasize the use of modern fatigue and fracture mechanics technology in the design of durable, damage-tolerant aircraft structures and the extended safe use of aging aircraft.
The course opens with a discussion of basic fatigue and fracture behavior of structural metallic materials. With this background, the ensuing lectures detail the structural methods used in the aircraft industry to develop fatigue loading spectra, as well as fatigue life, crack growth, and residual strength analyses. The course also explores the application of this technology to verify the structural integrity and longevity of new aircraft, along with life monitoring, maintenance, and life extension of aging aircraft.
UCLA Extension has presented this highly successful short course since 1971.
Course Materials
Lecture notes are distributed on the first day of the course. These notes are for participants only and are not otherwise available for sale or unauthorized distribution.
Daily Schedule
Monday
Course Overview and Fundamentals (Creager)
Course overview, historical background, design criteria, design philosophies, aging aircraft issues.
Fracture Mechanics (Creager)
Crack tip stress fields, stress intensity factor, small-scale yielding, plane stress and plane strain, failure theories, failure prediction, fracture toughness testing, crack growth resistance curves, damage tolerance analysis of redundant structures.
Fatigue Analysis Methods (Creager)
S-N curves, stress ratio effects, cycle counting, Miner's Rule, strain-life curves, cyclic stress-strain curves, local strain analysis method, equivalent initial flaw size, scatter factors, notch effects, stress concentrations, stress severity factor analysis, Neuber's Rule, residual stresses, coldworking effects, fatigue-enhancing fasteners.
Tuesday
Material Fatigue Behavior (Hoeppner)
Fatigue variables and mechanisms, materials characterization, mechanical behavior of materials, fatigue limit prediction, life prediction (constant amplitude), multiaxial stress states, conceptual model of fatigue, initial material discontinuities, material fatigue testing, analysis of test results, corrosion fatigue, fretting fatigue, corrosion of aging aircraft, service failures/failure analysis.
Wednesday
Fatigue Crack Growth Analysis (Brussat)
Fundamentals of prediction, crack growth testing, variables affecting da/dN, load spectrum effects, crack retardation models, crack growth computer programs.
Crack Growth and ASIP (Brussat)
Stress intensity estimation; damage tolerance testing and analysis of airframe structure; and applications of crack growth analysis in the USAF Aircraft Structural Integrity Program, including correlation of full-scale durability test, in-service inspections, and individual aircraft tracking.
Thursday
Fatigue Examples (Eastin)
Brief case history of eight in-service accidents and incidents attributed to fatigue, small airplanes, rotorcraft, large transports, motorcycle.
Civil Aircraft Fatigue Management Strategies (Eastin)
Normal and anomalous fatigue, fundamental type design strength requirements and safety objective, safety-by-retirement, safety-by-design, safety-by-inspection,
The Lusaka Accident (Eastin)
B707-321C crash in Africa, root causes, lessons learned, impact on civil airplane certification requirements.
MSD, MED, WFD, LOV, and the New “WFD Rule” (Eastin)
Amendment 25-45 and damage at multiple sites, supplemental inspection documents, Aloha accident and its impact, Amendment 25-96, multiple site damage (MSD), multiple element damage (MED), widespread fatigue damage (WFD), limit of validity (LOV) of the maintenance program, the new “WFD Rule” and its effect on existing airplanes, future airplanes, and operators.
Friday
Fatigue Loading Spectra (Creager)
Usage spectra, mission profiles, load excedance curves, service loading spectra measurement.
Example Applications (Creager)
Repairs (design, analysis, and test); supplementary inspection programs; structural life extension programs.
Summary and Wrap-Up (Creager)
Note: This course concludes at 12 noon.
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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