Last edited by Arakinos
Tuesday, October 20, 2020 | History

2 edition of Influence of geometry and residual stress on fatigue of welded joints found in the catalog.

Influence of geometry and residual stress on fatigue of welded joints

Kenneth A. Selby

Influence of geometry and residual stress on fatigue of welded joints

by Kenneth A. Selby

  • 285 Want to read
  • 40 Currently reading

Published by University of Illinois in Urbana .
Written in English

    Subjects:
  • Welded joints -- Testing.,
  • Steel -- Fatigue.,
  • Residual stresses.

  • Edition Notes

    Bibliography: leaves 64-65.

    Statementby K. A. Selby, J. E. Stallmeyer and W. H. Munse. A report of an investigation conducted by the Civil Engineering Dept., University of Illinois in cooperation with National Steel Corp.
    SeriesCivil engineering studies; structural research series, no. 297
    ContributionsStallmeyer, James Edward, 1926- joint author., Munse, William Herman, joint author.
    Classifications
    LC ClassificationsTA492.W4 S42
    The Physical Object
    Paginationviii, 104 l.
    Number of Pages104
    ID Numbers
    Open LibraryOL5028752M
    LC Control Number73627412

    @article{osti_, title = {Stress intensity factors}, author = {Murakami, Y}, abstractNote = {This book provides a survey of the field of fracture mechanics, covering mixed-mode fracture, dynamic fracture, composite materials, residual stresses, welding and electromagnetic problems. It gives information on specific practical and theoretical problems and contains . Residual stress produced during the welding has been proved to be an important issue in the fatigue life assessment of welded joints for the high-cycle [30,31] and medium-cycle [32,33] fatigue.

    A Study of the Influence of Joint Geometry T.R. Gurney (Auth.) This report is the result of a major study on the influence of both main plate thickness and of attachment size on the fatigue strength of joints with transverse non-load-carrying fillet welds. Figure 3: Welding Residual Stress Distribution, [1]. As a result the fatigue life of welded joints has limited sensitivity to the applied mean stress caused by theresult, the fatigue life of welded joints has limited sensitivity to the applied mean stress caused by the • Local stress concentration due to the weld geometry;.

    To address this problem, the main objective of this research is to assess, experimentally and numerically, welding residual stresses and their influence on the fatigue response of K-joints. In this thesis, experimental measurements of the residual stress fields were investigated through neutron-diffraction, hole-drilling and X-ray methods. Fatigue design concepts for welded structures generally consider residual stresses as a factor affecting the mean stress influence. Residual stresses are mostly interpreted as mean stresses. In addition, high tensile residual stresses are conservatively assumed, resulting in maximum effective load stresses from fatigue loading in the order of.


Share this book
You might also like
Examining the filibuster

Examining the filibuster

Giving up farming

Giving up farming

Comprehensive wound management

Comprehensive wound management

The island of Fu Manchu.

The island of Fu Manchu.

Eugenie Grandet.

Eugenie Grandet.

Mathematics for the Managerial, Life and Social Science

Mathematics for the Managerial, Life and Social Science

National Peace Garden Memorial

National Peace Garden Memorial

MRS protocol for the in vivo determination of endogenous skeletal muscle metabolities.

MRS protocol for the in vivo determination of endogenous skeletal muscle metabolities.

O.C.S. amendments of 1978- oversight

O.C.S. amendments of 1978- oversight

Trail of the goldenskull

Trail of the goldenskull

Sources of and methods of funding courses.

Sources of and methods of funding courses.

Lightning

Lightning

measurement of domestic cyclical fluctuations.

measurement of domestic cyclical fluctuations.

Mobile communications

Mobile communications

Influence of geometry and residual stress on fatigue of welded joints by Kenneth A. Selby Download PDF EPUB FB2

High tensile residual stresses have a very significant effect on fatigue. Any applied fluctuating stresses are superimposed onto the residual stress, as illustrated in Fig. If this is as high as tensile yield, the resulting effective stress cycles down from yield, the range being unchanged (Gurney, ).Thus, the welded joint experiences the most severe effect of tensile mean stress.

The influence of residual stress was studied by comparing the fatigue results of as-welded, stress relieved and unwelded specimens with the same geometry.

Fatigue failures tended to initiate in regions of maximum tensile transverse residual stress. Estimates of the maximum stress at the toes of a weld revealed that this stress is approximately Author: K.A. Selby, J.E.

Stallmeyer, W.H. Munse. On the other hand, removing the weld reinforcements may cause changes in the residual stresses. There is a considerable body of literature on the influences of weld geometry on fatigue behavior of welded joints from classical point of view, yet data on effects of the weld reinforcement on FCGR are by: 1.

The influence of weld geometry and residual stress in the fatigue strength of longitudinal stiffeners was studied by [49] in detail. This work considers residual stress and clamping stress.

Welding is a manufacturing method used to join various materials in order to form an assembly. During welding, joints are formed between two or more separate pieces of material. A welded joint subjected to cyclic loading could fail due to fatigue. Fatigue results from this cyclic loading, as well as strains, in the material.

Throughout a welded assembly's life, cracks, which reduce the fatigue. On the premise of only considering along-wind effect on guyed mast, the influence of welding residual stress on the fatigue life of welded joints is evaluated in this paper.

Since the sum of residual stress and along-wind-induced dynamic stress exceeds the yield strength of structural steel, the effect of residual stress relaxation is included in the numerical analysis.

Residual stresses, as the consequence of several production steps of welded structures, influence the fatigue strength of welded joints and components.

In order to determine the relevant residual stress level, the modification of residual stresses by the effect of external loading has to be considered.

It is often observed, that thick walled welded structures contain tensile residual stresses rather than compressive ones, which may be as high as the yield stress of the welded material.This is considered, for example, when allowable stresses for design purposes are derived by tests with specimens under the stress ratio R = 0–.The selection of these stress.

Introduction. During their service life, components and structures are subject to severe cyclic and dynamic loading, which may result in fatigue damage at welded joints where local stress concentrations are relatively high due to the joint geometry, e.g.

weld toes and roots, and tensile residual order to overcome this effect, researchers have suggested several. The results show that (1) the longitudinal residual stress (σ Z) on the top and bottom surfaces of the deck vary with its welding direction respectively (perpendicular or parallel); (2) the maximum value of the real stress under the coupling effect of train load stress and residual stress is less than the yield strength (f y), so the influence.

These stresses have a negative impact on the integrity of the welded joint as they promote distortion, reduce fatigue life, and contribute to the stress corrosion cracking and brittle fracture in the weld paper deals with the influence of plate thickness and plate geometry on the welding induced residual stresses from submerged.

This dissertation makes an effort to understand the influence of residual stresses on the fatigue failure of butt- and socket-welded piping joints. In order to achieve this goal, this study develops experimental fatigue failure data and a numerical scheme for the analysis of these data.

The local weld geometry of the cruciform welded joints was measured and analysed. The measured parameters were used to calculate the stress concentration factors by implementing FE‐models, in order to anticipate the influence of size of weld geometrical parameters on the stress concentrations.

Fatigue tests were carried out on fillet welded joints in four steels, with yield strengths ranging from to N/mm 2, under various applied load specimens were stress-relieved but most were spot-heated to ensure that high tensile residual stresses, as would be present in as-welded joints in real structures, were present in the specimens.

Residual Stress Relaxation in Welded Steel Joints – an Experimentally-based Model J. Hensel, T. Nitschke-Pagel, K.

Dilger Abstract. Residual stresses may affect the fatigue strength of welded components significantly. Structural design concepts for fatigue loaded welds do not account for real residual stress conditions but rather generally estimate high tensile residual stresses.

High-frequency mechanical impact (HFMI) post-treatment is a proven method to improve the fatigue life of welded structures. The positive effects of HFMI treatment are influenced b. The residual stress effect on fatigue crack initiation of butt-welded plates is investigated by considering no effects of residuals stresses and by considering the numerically predicted residual.

In welded joints, fatigue cracks can initiate either at the weld toe or the weld root. of weldments by means of improving their geometry or residual stresses, or both. Further fatigue testing, weld defect assessment and residual stress and local weld geometry measurements were carried out on joints welded with flux cored and metal cored arc wires.

Two-and three dimensional LEFM crack growth analysis were carried out in order to predict the influence of weld defects, local weld geometry and residual stresses. Fatigue strength of pipe-to-flange welded joints is affected by residual stress and assembling stress at the weld toe.

near-toe stresses influence strongly the fatigue life of welded plate. Beside material properties, loading condition, environmental aspects, weld defects and weld geometry, it is well known that the influence of welding residual stresses should be taken in to consideration.

The extent of the influence of the residual stresses on fatigue life is a .welded joints without inclusions and distortions as well as lower residual stress can be realised. Laser welding technol-ogy entails more expensive equipment. Welding process parameters such as the laser beam power, welding speed and shielding gas purity govern the final geometry of the weld seam and joint quality.Influence of Geometry and Residual Stress on Fatigue of Welded Joints.

By K.A. Selby, J.E. Stallmeyer and W.H. Munse. Abstract. The purpose of this investigation was to study the factors which contribute to the relatively low fatigue strength of welded joints in high strength steel subjected to low mean stress and a large number of cycles.