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Welding in the World

, Volume 56, Issue 7–8, pp 82–96 | Cite as

Overview of Fatigue Data for High Frequency Mechanical Impact Treated Welded Joints

  • Halid Can YildirimEmail author
  • Gary B. Marquis
Peer-Reviewed Section

Abstract

paper provides an overview of published experimental data on the fatigue strength of welded joints by high frequency mechanical impact (HFMI) treatment methods, In total, 414 data points from four specimen types are available,tests were performed using constant amplitude R = 0.1 axial tension fatigue, but some data for other R rations, variable amplitude testing and bending fatigue are also reported. An S-N slope of m = 5 gives a very good description of both individual data sets and of the composite data Design curve recommendations for the four joint types and for the structural stress-based design curve are given. HFMI treated specimens generally follow the same trend as experimental data for hammer peened specimens, but the degree of improvement is better. Data for large structures, at stress ratios other than R=0.1 and for variable amplitude loading are still needed in order to update the IIW guideline for post-weld improvement. There is a general trend for increasing fatigue strength improvement as a function of steel yield strength but this influence needs further study in order to develop guidelines. Quality assurance measures for HFMI treatment methods must also be defined.

IIW-Thesaurus keywords

Fatigue improvement High strength steels Impact toughness Weld toes 

Nomenclature

A

Statistical intercept

B

Statistical slope

Â

Estimate of the intercept

B

Estimate of the slope

Ci

Fatigue capacity of specimen i

C50%

Computed mean fatigue capacity of test series

C97.7%

Characteristic fatigue capacity of the test serjes

fy

Yield strength

fu

Ultimate tensile strength

FAT

Characteristic fatigue class in MPa at 2 × 106 cycles to failure Characteristic fatigue class in MPa based on 97.7 % survival

FAT97.7%

probability at 2 × 106 cycles to failure at 75 % level of confidence

k

Number of test specimens in a data set

kR

Stress ratio correction factor

khs

Structural hot-spot stress concentration factor

m

Slope of the S-N curve

N

Number of fatigue cycles

Nf

Cycles to failure

Ni

The number of cycles to failure of specimen i

Pf

Probability of failure

R

Stress ratio

ΔSi

Stress range of specimen i

Seq

Equivalent constant amplitude stress range

SnA5

Nominal stress amplitude at 5 % failure probabilities

SnA95

Nominal stress amplitude at 95 % failure probabilities

Tσ

Scatter range in stress

tp

Student distribution

Xi

log Ni

Yi

log ΔSi

\( \bar X \)

Average of log Ni

\( \bar Y \)

Average of log ASi

ŷ

Estimate of log ASi

σ

Standard deviation

\( \hat \sigma _{\rm N} \)

Estimate of the normal distribution variance

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Copyright information

© International Institute of Welding 2012

Authors and Affiliations

  1. 1.Department of Applied MechanicsAalto UniversityAaltoFinland

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