Fatigue Crack Growth in Notched Parts With Compressive Mean Load

Saal, Helmut

doi:10.1115/1.3425376

Cited by 20 publications

(11 citation statements)

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“…Local plastic yielding due to the notch and cyclic loading could have caused the appearance of some local tensile stresses. This suggestion is supported by the experimental and theoretical analysis of residual stress effect on fatigue crack growth [7,8].…”

Section: Constant Amplitude Loadingmentioning

confidence: 58%

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Fatigue Life Calculation and Testing of Full‐scale Welded I‐beams

Glinka

Krzyżeki

1981

Fatigue Fract Eng Mat Struct

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Fatigue tests under four-point bending were carried out on low alloy steel welded I-beams under constant and variable amplitude loading. Four different types of stiffeners welded to flanges and webs were analysed. Particular attention was paid to the effect of configuration at the stiffener-ends. It was shown that the stiffener-ends were the most critical points. Fatigue cracks initiated and propagated in both tension and compression flanges. The fatigue life to crack initiation was calculated on the basis of the local stress strain analysis. Both theoretically and experimentally estimated stress concentration factors were used for calculation. The predicted fatigue lives were compared with the respective values obtained in experiments.

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Section: Constant Amplitude Loadingmentioning

confidence: 58%

“…The tensile stresses could have been introduced during welding operations. Local plastic yielding due to the notch and cyclic loading could have caused the appearance of some [7,8].…”

Section: Constant Amplitude Loadingmentioning

confidence: 98%

Fatigue Life Calculation and Testing of Full‐scale Welded I‐beams

Glinka

Krzyżeki

1981

Fatigue Fract Eng Mat Struct

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“…Like Gerber [5] and Saal [6], the present authors calculated the crack opening stress by assuming that a fatigue crack closed completely at the minimum applied stress and that compressive plastic deformation took place near the notch as if there were no crack [ I I]. This method is briefly described as follows.…”

Section: Model For Predicting Crack Openlpjg Stressmentioning

confidence: 99%

“…The propagation of a short fatigue crack under cyclic compression is caused by the tensile residual stress due to plastic contraction at the notch root under the minimum (compressive) applied stress. Like Gerber [5] and Saal [6], the present authors calculated the crack opening stress by assuming that a fatigue crack closed completely at the minimum applied stress and that compressive plastic deformation took place near the notch as if there were no crack [ I I]. This method is briefly described as follows.…”

Section: Model For Predicting Crack Openlpjg Stressmentioning

confidence: 99%

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Propagation and Closure of Short Fatigue Cracks at Notches Under Compressive Mean Stresses

Akiniwa

Tanaka

Taniguchi

1988

Fatigue Fract Eng Mat Struct

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Single-edge-notched specimens of a low-carbon steel were fatigued under cyclic in-plane bending with compressive mean stresses. The development of crack closure with crack growth was studied both experimentally and theoretically. The relation between the crack opening stress and the crack length was a function of the minimum (compressive) applied stress, irrespective of the maximum stress. The efl-ective stress intensity range was a unique parameter in correlating the crack growth rate, even if the crack wdS embedded in the compressive plastic zone. Under a constant minimum stress, the length of nonpropagating cracks became longer with increasing maximum applied stress. A theoretical model was proposed for predicting the crack opening stress on the basis of the compressive stress distribution at the minimum applied stress. The predicted value agreed fairly well with the experimental result. The model gave upper bounds of the crack growth rate and the length of nonpropagating Fatigue cracks within the plastic zone. NOMENCLATURE a =crack length including notch depth u', c'. n' =coefficients of the stress-strain relation c =crack length from the notch-tip c,. c,. cnp = mean, surface and non-propagating crack length dc/dN =crack propagation rate F. F , , F2 =geometrical correction factors for the stress intensity factor (SIF) K = SIF value due to applied stress K,,,, K,,, = SIF value due to minimum and maximum applied stress Kop = SIF value at crack opening K,, = SlF value due to residual stress Kr = stress concentration factor K*. K:," = true SIF value and SIF value calculated from the stress distribution at minimum applied nominal stress AKen, AK,,, =effective SIF range and its threshold value M = weight function R = ratio of minimum to maximum stress I = notch depth W = specimen width x =distance from the edge of specimen to load point p = notch-root radius 6 = von Mises equivalent stress u, = applied nominal stress amplitude u, = applied nominal mean stress = von Mises equivalent plastic strain urnax. u,,, = maximurn and minimum applied nominal stresses u:," =stress at minimum applied nominal stress u, = applied nominal stress uy = yield stress w, w * = plastic zone size at urnin and reversed plastic zone size at umrl 343 344 Y. AKINIWA er a1

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