The Fatigue Strength of Transverse Fillet Welded Joints

Gurney, T R

doi:10.1533/978-1-84569-832-4

Cited by 54 publications

(46 citation statements)

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“…Kept constant the nominal load ratio (R = 0), structural steels and welding process, the influence of residual stresses is shown in Figure 8, where fatigue data obtained by Gurney from stress relieved joints are plotted together with those obtained by the same Author by testing "as-welded" joints (Gurney, 1991). In the absence of any residual stress, the fatigue curve exhibits a knee in correspondence of about 10 6 cycles to failure, over which the fatigue strength of stress relieved specimens remains practically constant (the mean value being about equal to 0.14 MJ/m 3 ).…”

Section: Fatigue Strength In Terms Of Strain Energy In a Finite Size mentioning

confidence: 99%

“…Figure 1 shows some series of welded joints already analysed by Lazzarin and Tovo (1998). Original data were taken from Maddox (1987) and Gurney (1991) (see Table 2, series St1-12). In those series the main plate thickness ranged from 6 mm to 100 mm and the variation of the transverse stiffeners was even more pronounced (from 3 mm to 220 mm).…”

Section: Introductionmentioning

confidence: 99%

“…Fatigue data for as-welded joints in terms of nominal stress and NSIF ranges (after Lazzarin and Tovo, 1998). Original experimental data taken from Maddox (1987) and Gurney (1991), (see Table 2). summarising fatigue total life data, without operating any distinction between fatigue crack nucleation and propagation.…”

Section: Introductionmentioning

confidence: 99%

“…Original stress-based data fromGurney (1991). Strain energy-based scatter band summarising fatigue strength data of aluminium alloy welded joints subjected to tension and bending loads.…”

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confidence: 99%

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Fatigue strength of steel and aluminium welded joints based on generalised stress intensity factors and local strain energy values

2005

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Weld bead geometry cannot, by its nature, be precisely defined. Parameters such as bead shape and toe radius vary from joint to joint even in well-controlled manufacturing operations. In the present paper the weld toe region is modelled as a sharp, zero radius, V-shaped notch and the intensity of asymptotic stress distributions obeying Williams' solution are quantified by means of the Notch Stress Intensity Factors (NSIFs). When the constancy of the angle included between weld flanks and main plates is assured and the angle is large enough to make mode II contribution non-singular, mode I NSIF can be directly used to summarise the fatigue strength of welded joints having very different geometry. By using a large amount of experimental data taken from the literature and related to a V-notch angle of 135 degrees, two NSIF-based bands are reported for steel and aluminium welded joints under a nominal load ratio about equal to zero. A third band is reported for steel welded joints with failures originated from the weld roots, where the lack of penetration zone is treated as a crack-like notch and units for NSIFs are the same as conventional SIF used in LEFM. Afterwards, in order to overcome the problem related to the variability of the V-notch opening angle, the synthesis is made by simply using a scalar quantity, i.e. the mean value of the strain energy averaged in the structural volume surrounding the notch tips. This energy is given in closed form on the basis of the relevant NSIFs for modes I and II and the radius R-c of the averaging zone is carefully identified with reference to conventional arc welding processes. Rc for welded joints made of steel and aluminium considered here is 0.28mm and 0.12mm, respectively Different values of Rc might characterise welded joints obtained from high-power processes, in particular from automated laser beam welding. The local-energy based criterion is applied to steel welded joints under prevailing mode I (with failures both at the weld root and toe) and to aluminium welded joints under mode I and mixed load modes (with mode II contribution prevailing on that ascribable to mode I). Surprising, the mean value of Delta W related to the two groups of welded materials was found practically coincident at 2 million cycles. More than 750 fatigue data have been considered in the analyses reported herein

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Section: Fatigue Strength In Terms Of Strain Energy In a Finite Size mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Original stress-based data fromGurney (1991). Strain energy-based scatter band summarising fatigue strength data of aluminium alloy welded joints subjected to tension and bending loads.…”

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confidence: 99%

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Fatigue strength of steel and aluminium welded joints based on generalised stress intensity factors and local strain energy values

2005

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“…For the same distance to the corner a i , the notch stress of the thicker plate t 2 is close to the surface stress; due to the large stress gradient, the stress for the thinner plate t 1 at weld toe drops sharply in the depth direction, which results a relatively small stress at the distance a i . Gurney (1991) suggested a correction factor as expressed by Eq. (20) for plates thicker than 22 mm as follows:…”

Section: Basic S-n Curvesmentioning

confidence: 99%