Cumulative Damage of Welded Joints explores the wealth of research in this important field and its implications for the design and manufacture of welded components.

Cumulative Damage of Welded Joints:

• Covers the wealth of research in the field of fatigue strength and its role in the design and manufacture of welded components
• Invaluable reference source for welding engineers, supervisors, inspection personnel and designers

Cumulative Damage of Welded Joints is a comprehensive source of invaluable information for welding engineers, supervisors, inspection personnel and designers.

Cumulatiave Damage of Welded Joints will also be of great interest for academics working in the fields of structural and mechanical engineering.

Contents

The constant amplitude database

• Method of analysis and joint design classification: Continuous longitudinal welds, intermittent longitudinal fillet welds
• Transverse butt welds: Transverse butt welds on a permanent backing bar, cruciform joints, stud shear connectors, fillet welded joints, beams with welded flange cover plates, longitudinal gusset on a plate edge
• Influence of plate thickness
• Influence of mean stress: Transverse butt welds, Fillet welded joints

Residual stresses

• The formation of residual stresses
• Comparison between static and fatigue conditions
• Approximate theoretical analysis
• Tests on welded specimens under constant amplitude loading
• Prior overloading

Variable amplitude loading and testing

• Variable amplitude loading
• Rainflow counting
• Reservoir counting
• Level-crossing counting
• Statistical interpretation of count data
• Miner’s rule
• Variable amplitude fatigue testing; a brief history: block programme loading, random order loading, narrow band loading, wide band loading, superimposed sine waves, summary of early test results

Tests under two and three level loading

• Theoretical analysis: stress sequences with a single size of excursion, stress sequences with excursions of two sizes, general case; the area rule
• Fatigue tests using stress sequences with excursions of two sizes
• Influence of stress ratio and residual stresses
• Summary of findings

The influence of spectrum shape and block length

• Fatigue tests under concave upwards spectra
• Fatigue tests under Rayleigh and Laplace loading spectra
• Tests under Weibull stress spectra
• Influence of spectrum shape and clipping ratio combined
• Influence of block length and clipping ratio combined
• Influence of block length and spectrum shape combined

The influence of narrow and wide band loading

• Comparing loading types
• Tests under narrow band loading
• Tests under wide band loading
• Tests under service loading spectra

The influence of cycles of small stress range

• Block testing of low stresses
• Comparative tests on stress relieved joints
• Predicting fatigue life

Design for variable amplitude loading

• Testing for different types of stress
• The area rule
• Possible modifications to Miner’s rule
• The fracture mechanics approach

More on the fracture mechanics approach – the effect of stress interaction

• Summary of experimental evidence about stress interaction effects

Appendices

• Statistical analysis of constant amplitude test data, References used in compiling the British fatigue design S-N curves
• Fatigue loading spectra
• Summary of test results obtained under variable amplitude loading
• Probability density curves

Index

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