Effect of specimen size on fatigue crack growth rate in AISI 4340 steel

Putatunda, Susil K.; Rigsbee, J. M.

doi:10.1016/s0013-7944(85)80034-5

Cited by 19 publications

(6 citation statements)

References 19 publications

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“…They also adopted the back face strain gauge technique to identify the crack opening load P op , and therefore the effective amplitude of the stress intensity factor range, ∆K eff, which is a function of (P max -P op ), as ∆K is a function of (P max -P min ). This procedure was also adopted by Kitsunai [6], whereas in [7] the X-ray diffraction with the sin 2 ψ method, using a parallel-beam diffractometer, was used. However, both the sectioning and X-ray diffraction methods provide information on residual stresses close to surface only.…”

Section: Experimental Details and Discussionmentioning

confidence: 99%

Fatigue Crack Propagation Behavior of the Welded Steel of a Railway Bridge

Miranda¹,

Albuquerque²,

Richter-Trummer³

et al. 2012

MSF

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In the context of a R&D project concerning the new Alcácer do Sal composite railway bridge, a study of the fatigue crack growth on samples of its base material and weldments was performed. For this purpose, tests were carried out on CT specimens designed according to ASTM E647 standard, using the approximate thickness (B) of a structural detail of interest, B=32mm. The choice of B led to a relatively large specimen and was justified by the desire to better simulate service conditions, which would not be possible with smaller specimens, particularly in the case of weldments. The test matrix used included three values of R ratio (maximum/minimum load), 0.1, 0.4 and 0.7, and three material conditions, namely base material (BM), heat affected zone (HAZ) and weld metal (WM). When the nominal range of the stress intensity factor (DK) is used, the measured data displays a strong effect of the weldments on the FCG rates, with the base material presenting higher da/dN values. An evaluation of opening load behaviour was carried out, and it showed extensive closure caused by residual stresses in the HAZ and WM specimens. The investigation included the full field measurement of the residual stress perpendicular to the crack plane, using the contour technique. When the opening load effect was taken into consideration it was found that the da/dN vs. ∆K of the BM, HAZ and WM specimens is approximately identical. Furthermore if loading effects are considered, no significant difference is found for the three R values used, even if, as expected, higher R corresponds to higher da/dN values.

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Section: Experimental Details and Discussionmentioning

confidence: 99%

Fatigue Crack Propagation Behavior of the Welded Steel of a Railway Bridge

Miranda¹,

Albuquerque²,

Richter-Trummer³

et al. 2012

MSF

View full text Add to dashboard Cite

show abstract

“…The authors corroborated that the values of the Paris Law parameters are similar for this type of steels. Furthermore, the influence of specimen size parameters on fatigue crack growth rate was evaluated for an AISI 4340 steel, concluding that specimen thickness and width have no significant influence [17]. An empirical law based on the concepts of Linear Elastic Fracture Mechanics (LEFM), which is very useful for predicting the fatigue crack growth in stage II, was proposed [18].…”

Section: )] K IImentioning

confidence: 99%

Calibration of nasgro equation for mixed-mode loading using experimental and numerical data

Berrios-Barcena

Franco-Rodríguez

Rumiche-Zapata

2019

redin

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A procedure to calibrate the NASGRO equation in a high yield-strength steel under mixed-mode loading (I + II) is presented. The calibration consists in obtaining the material parameters known as C, m, p and q. The procedure is based on experimental and numerical results. The experimental tests were used to characterize the material and obtain fatigue crack growth data. For the fatigue tests, tapered double cantilever beam (TDCB) specimens with different maximum load and load ratio values were used. Through the numerical analysis, the stress intensity factors, the crack growth direction and the crack path coordinates were calculated. The numerical analysis was performed using XFEM and the maximum energy release rate criterion. The calibrated model allows predicting the number of load cycles with an RMS value of less than 5%, compared with the experimental results.

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“…Previous studies reveal that the sample thickness has obvious influence on the FCG rate of materials, while some controversies exist. Some proposed that the sample thickness has no effect 2,3 . Others pointed out the FCG rates increased 4–9 or decreased 10,11 with increasing the specimen thickness.…”

Section: Introductionmentioning

confidence: 99%

“…Some proposed that the sample thickness has no effect. 2,3 Others pointed out the FCG rates increased [4][5][6][7][8][9] or decreased 10,11 with increasing the specimen thickness. The above phenomenon is reasonable as the thickness effect is actually the reflection of several factors including the stress state and microstructure.…”

Section: Introductionmentioning

confidence: 99%

A new strategy to clarify the thickness effect on the fatigue crack growth rate in high‐strength steels

Cui

Peng

et al. 2022

Fatigue Fract Eng Mat Struct

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It is generally recognized that the fatigue failure of the cracked engineering components is a crucial issue, especially considering the sample thickness effect. Although numerous methods have been proposed, it is still unclear about the sample thickness effect on the fatigue crack growth (FCG) rate of metallic materials. Based on the plasticity-induce crack closure and crack tunneling effect, we established an improved FCG model with a thickness factor T by the load analysis near the crack tip. The thickness factor could clarify the sample thickness effect on the FCG rate of high-strength steels. Numerous fatigue data demonstrates that the improved model displays a fairly good relationship between the sample thickness and FCG rate. It would provide a new strategy to the FCG rate prediction of cracked structures through small size specimen.

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Effect of specimen size on fatigue crack growth rate in AISI 4340 steel

Cited by 19 publications

References 19 publications

Fatigue Crack Propagation Behavior of the Welded Steel of a Railway Bridge

Fatigue Crack Propagation Behavior of the Welded Steel of a Railway Bridge

Calibration of nasgro equation for mixed-mode loading using experimental and numerical data

A new strategy to clarify the thickness effect on the fatigue crack growth rate in high‐strength steels

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