[yim110] Lecture notes on fatigue, static tensile strength and stress corrosion of aircraft materials and structures: Part I: text - Schijve (1982)
The present course book was primarily written up as lecture notes for a summer course, given at the Technical University of Bandung (ITB) in. August 1982. The summer course was part of a cooperation between ITB and the Department of Aerospace Engineering of the Delft University of Technology. The cooperation is a contribution to the TTA-79 Technical Assistance' Project as agreed between the Governments of Indonesia and The Netherlands.
The subjects of the course are listed in the contents. The main emphasis is on fatigue (chapter 7 to 12), while stress corrosion (chapter 6) and static failure in tension (chapter 5) are covered each in a separate chapter. Stress concentrations at notches, stress intensities at crack tips and residual stresses are highly relevant to all topics. For that reason these concepts are treated first (chapters 2, 3 and 4).
For convenience the test and the figures have been printed in separate volumes.
Table of Content :
1 FAILURE MODES IN AIRCRAFT STRUCTURES
Introduction - Failure modes - Failure prevention - Failure analysis - Subjects of the present course
STRESS CONCENTRATIONS AT NOTCHES
Introduction - Definition of Kt - Analytical calculations - The effect of the geometry (shape) on Kt - Superposition of notches and similarity of notches - Methods for determination of stress concentrations
References
3 PLASTIC DEFORMATION AND RESIDUAL STRESS
Introduction - Different sources of residual stress systems - Calculations on residual stresses at notches - Some additional remarks
STRESS INTENSITY FACTORS OF CRACKS
Introduction - Different types of cracks and crack opening modes- Definition of the stress intensity factor K - Examples of stress intensity factors - K-factors by superposition - Crack opening and the state of stress - Energy considerations and the Griffith criterion Cracks with a curved crack front - Determinations of K-values Crack tip plasticity
References
5 FAILURE IN TENSION
Introduction - The tensile strength of a material - The hardness of a material - The static tensile strength of a notched element - The fracture toughness K - Cracks in sheets, behaviour under static loading
References
6 STRESS CORROSION
Introduction - The stress corrosion process - Stress corrosion tests, variables and purpose of tests - How to prevent stress corrosion in aircraft structures - Hydrogen embrittlement
References
7 MATERIAL FATIGUE
Introduction - The fatigue process in different phases - The fatigue mechanism - Characteristics of a fatigue fracture - Factors which influence fatigue behaviour - Stress amplitude and mean stress, fatigue' curves and fatigue diagrams - Environmental effects - Some surface effects - Fretting
References
8 FATIGUE UNDER CONSTANT-AMPLITUDE LOADING
Introduction - The fatigue strength of a notches element under CA-loading - Estimation of the fatigue limit of a notched element for a > 0 - Estimation ofmthe fatigue limit of a notched element for a > 0 - The notch effect for finite life - Fatigue crack propagation and the stress intensity factor - Fatigue crack propagation properties of a material,and the stress intensity factor - Prediction of fatigue crack growth based on the stress intensity factor
References
9 FATIGUE UNDER VARIABLE-AMPLITUDE LOADING
Introduction - Fatigue damage, damage accumulation and interaction effects - Some results of tests with variable-amplitude loading - Macrocrack growth and variable-amplitude loading - Some concluding remarks on fatigue prediction for VA-loading
References
10 FATIGUE OF JOINTS
Introduction - Bolt loaded in tension - Fatigue of lugs - Symmetric joints with rows of bolts or rivets - Asymmetric joints with rows of bolts or rivets' - Riveted joints - Adhesive-bonded joints - Some concluding remarks
References
11 FATIGUE LOADS ON AIRCRAFT STRUCTURES
Introduction - The load history - Counting methods - Deterministic and stochastic loads - Mission analysis - The purpose of mission analysis - Some concluding remarks
References
12 FATIGUE OF AIRCRAFT STRUCTURES
Introduction - Design aspects - Predictions and calculations - Fatigue testing methods - Full-scale tests and scatter factors - Maintenance and inspection
References
Tabel 12.1
# Title : Lecture notes on fatigue, static tensile strength and stress corrosion of aircraft materials and structures: Part I: text
# Author : Schijve, J
# Publisher:Delft University of Technology, Department of Aerospace Engineering (1982)
# Language: English
# Report LR-360
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