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Stress concentration

About: Stress concentration is a research topic. Over the lifetime, 23250 publications have been published within this topic receiving 422911 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the fatigue crack propagation behavior of a magnesium single crystal using molecular dynamics simulation and found that the growth rate of fatigue crack decreasing with increasing strain rate.

90 citations

Journal ArticleDOI
TL;DR: In this paper, a mixed-mode stress intensity factor (termed the stress index Ki) was developed to correlate the fatigue life of all spot weld geometries, base metals, and specimen dimensions.
Abstract: — Mode I and mode II stress intensity factors for two half-spaces connected by a circular patch were used to develop a mixed-mode stress intensity factor (termed the stress index Ki) which can correlate the fatigue life of all spot weld geometries, base metals, and specimen dimensions. Empirical corrections were applied to Broek's equivalent stress intensity factor (Klq) to account for the weldment geometry (sheet thickness, nugget diameter, specimen width) and the effect of mean stress. The final expression, (Ki), is a measure of the notch-root stress field in the location where crack initiation and early crack growth occur. The stress index (ki) should be a useful tool for spot-weld fatigue design.

90 citations

Journal ArticleDOI
TL;DR: In this paper, a comparative study of some recent methods developed for the estimation of high-cycle fatigue behavior of components containing stress concentrations is presented, and two new methods are described which have been developed during the last few years: the crack modelling method (CMM) and the critical distance method (CDM).
Abstract: This paper reports a comparative study of some recent methods developed for the estimation of high-cycle fatigue behaviour of components containing stress concentrations. It begins by reviewing some existing methods for the prediction of fatigue limits: the stress-life method, linear elastic fracture mechanics, the Kitagawa-Takahashi and Atzori-Lazzarin approaches and the method of Smith and Miller. Two new methods are described which have been developed during the last few years: the crack modelling method (CMM) and the critical distance method (CDM). These methods were tested by comparing their predictions with experimental data using a large database of 88 different notch geometries and materials. Notches were divided into three types: blunt, sharp and short. The CDM was found to be very successful for all types of notch, giving predictions within 20 per cent of experimental values in the great majority of cases. The CMM encountered difficulties with short notches; correction factors were developed to ...

90 citations

01 Jan 1985
TL;DR: In this paper, parametric equations are presented for estimating stress concentration factors (SCFs) in tubular T/Y and K-joints with emphasis on overlapped joints.
Abstract: The fatigue analysis of offshore platforms requires accurate knowledge of the stress concentrations at tubular intersections. In this paper parametric equations are presented for estimating stress concentration factors (SCFs) in tubular T/Y and K-joints with emphasis on overlapped joints where no parametric equations are as yet available. The equations have been obtained from an extensive study, involving detailed stress analysis of over 150 joints under various load cases using the PMBSHELL program. This program is centred around a three-dimensional curved shell element capable of modelling explicitly the tube thickness and standard weld dimensions. The results of this investigation are compared, when appropriate, with predictions from the widely used Kuang and Wordsworth/Smedley equations. In T/Y-joints the important problems concerning the effect of diameter ratio and chord length ratio on SCFs are resolved. These effects are responsible for the significant differences in the existing equations. For T/Y type joints the Kuang equations often underpredict SCFs considerably. For K-joints equations are presented for a total of nine load cases. In the common case of balanced axial load overlapping is generally beneficial. However, in the case of unbalanced out-of-plane bending, which is important in the wave-active zone, overlapping leads to higher SCFs.

90 citations

Journal ArticleDOI
TL;DR: In this paper, Fatigue cracks were grown in center-notched sheet made from BS4360 50B structural steel, and cracks initiated and grew in regions of residual tensile stress at the notch roots.

90 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202373
2022220
2021628
2020642
2019608
2018581