Assessment of the effect of stress concentration on the fatigue resistance of structural materials under asymmetrical loading

Pogrebnyak, A. D.; Regul’skii, M. N.; Zheldubovskii, A. V.

doi:10.1007/s11223-013-9435-4

Cited by 4 publications

(3 citation statements)

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“…The vibration characteristics of fatigue damage of beam-type structural components has been researched [9,10] and a computational and experimental assessment of the sensitivity of structural materials to stress concentration under high-cycle asymmetrical loading has been performed [11]. A numerical calculation of the frequencies of natural vibrations of beams with a cross section varying linearly in height under different conditions of fixing their ends is presented [12].…”

Section: Introductionmentioning

confidence: 99%

A Method of Virtual Design of the Fatigue Life of a Dynamic Structure

2015

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The fatigue life prediction and reliability analysis of dynamic systems under random excitement are important topics in modern engineering design. However, the stress power spectra density of a component in a dynamic system must be known when one predicts its fatigue life and analyzes its reliability. With the rapid development of computer technology and numerical computation theories, it has been possible to simulate stress power spectra density of dynamic systems. Based on this, a method of simulating computation for the fatigue life prediction of a dynamic structure is presented. It depended on some simulating equations of the stress power spectra density of the structure and the fatigue life prediction which was obtained in this paper. By this way, as an example, the virtual design of the fatigue life and reliability analysis for the CW-200k vehicle truck was developed. The method is suitable not only for the running dynamic structure but also for newly designed structures.Keywords: random vibration system, stress power spectral density, fatigue life prediction, virtual design.Introduction. The fatigue life prediction and reliability analysis of dynamic systems under random excitement are important topics in modern engineering design [1][2][3][4][5][6][7][8]. The vibration characteristics of fatigue damage of beam-type structural components has been researched [9, 10] and a computational and experimental assessment of the sensitivity of structural materials to stress concentration under high-cycle asymmetrical loading has been performed [11]. A numerical calculation of the frequencies of natural vibrations of beams with a cross section varying linearly in height under different conditions of fixing their ends is presented [12]. However, the stress power spectral density of a component in a dynamic system must be known when one predicts its fatigue life and analyzes its reliability. A traditional way is to measure the stress power spectral density, which has played an important role in practice [4]. However, the stress power spectral density of a dynamic system will change with the alteration of the structure and dynamic parameters of a system. So the engineering application in this way is limited. Moreover, one is not able to obtain the stress power spectral density of a new dynamic system before it has been designed. With the rapid development of computer technology and numerical computation theories, it has been possible to simulate stress power spectral density of dynamic systems. Based on this, the method of simulating stress power spectral density is put forward in this paper, and as an example the fatigue life prediction and reliability analysis of vehicle truck are made. Computational Method of Stress Power Spectral Density. Random Response Spectra of Dynamic System Computation [1, 2]. In general, the vibration equation of a linear system can be written in matrix form as

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Section: Introductionmentioning

confidence: 99%

A Method of Virtual Design of the Fatigue Life of a Dynamic Structure

2015

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“…According to information statistics [1], about 80% to 90% failure of welded structure is belonged to fatigue fracture. The stress concentration sensitivity of structural materials is primarily determined by their properties, theoretical stress concentration factor, the size of the objects under investigation, loading conditions [2]. There are a lot of factors influencing fatigue strength of welded structures, but stress concentration is the most important one.…”

Section: Introductionmentioning

confidence: 99%

Calculation about Stress Concentration Coefficient of Welded Cruciform Joints of Magnesium Alloy Based on FEM

Zhang

et al. 2014

AMR

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Geometrical parameters of welded joint affect the stress concentration coefficient seriously. In order to increase the fatigue property of welded structure, it has great significance to reduce stress concentration coefficient of welded structures by researching and improving the geometry of welded joints. In this paper, the effects of weld tangent line angle θ on the stress concentration coefficient of welded cruciform joints of magnesium alloy were analyzed by using ABAQUS finite element program, and the change rule of stress concentration coefficient with the variation of the parameter was also researched. The calculation results indicate that reducing the weld tangent line angle θ can effectively decrease the stress concentration coefficient of welded cruciform joints, so as to improve the fatigue property of welded structures. In order to have high reliability and safety of welded structures of magnesium alloy, the true weld tangent line angle θ should be controlled less than 25°.

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“…The stress raisers concentrate stresses around themselves and make a hazardous region with high risk of initiating crack(s) and provoking sudden fracture. Therefore, the fracture resistance of graphite parts should be essentially investigated under mechanical loads, particularly in the presence of stress concentrators [1][2][3][4][5] or sharp cracks [6][7][8].…”

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confidence: 99%

Fracture Assessment of Blunt V-Notched Graphite Specimens by Means of the Strain Energy Density

Torabi

Berto

2013

Strength Mater

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The main aim of the present work is to check the suitability of the brittle fracture model, namely the local strain energy density (SED), in predicting the experimental results on mode I fracture of blunt V-notched graphite components. For this purpose, a wide range of test results reported in the recent literature on brittle fracture of V-notched test specimens characterized by different geometries is considered. The specimens are made of the same type of coarse-grained polycrystalline graphite. The fracture assessment is carried out predicting theoretically the fracture loads by means of the SED criterion. The SED parameter is evaluated by averaging the local energy over a well-defined control volume which embraces the notch edge. It is found that the SED criterion allows assessing the fracture behavior of graphite specimens characterized by different notch angles and tip radii

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Assessment of the effect of stress concentration on the fatigue resistance of structural materials under asymmetrical loading

Cited by 4 publications

References 1 publication

A Method of Virtual Design of the Fatigue Life of a Dynamic Structure

A Method of Virtual Design of the Fatigue Life of a Dynamic Structure

Calculation about Stress Concentration Coefficient of Welded Cruciform Joints of Magnesium Alloy Based on FEM

Fracture Assessment of Blunt V-Notched Graphite Specimens by Means of the Strain Energy Density

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