Experimental investigations of fatigue cracks nucleation, growth and coalescence in structural steel

Socha, Grzegorz

doi:10.1016/s0142-1123(02)00068-3

Cited by 46 publications

(38 citation statements)

References 3 publications

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“…This is shown in Figure 6(b) for a steel tested at different stress ranges (Socha, 2003). It is believed that the increased strain range under the same cyclic stress range is due to material softening under Cycles/10 2 Stress (MPa) (a) Cyclic test results for copper over a strain range of 0.6% [Dunne and Hayhurst, 1992] (b) Cyclic test results for steel at different stress amplitudes [Socha, 2003] Figure 6. Variation of (a) stress range for strain-controlled tests, and (b) strain range for stress-controlled tests against number of cycles in cyclic plasticity tests.…”

Section: Calibration Of Damage Evolution From Cyclic Loading Test Resmentioning

confidence: 94%

A Review on Damage Mechanisms, Models and Calibration Methods under Various Deformation Conditions

Lin

Liu

Dean

2005

International Journal of Damage Mechanics

143

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The development of microdamage under the deformation conditions of high temperature creep, cold metal forming, superplastic forming, and hot metal forming has been reviewed and discussed, and typical constitutive equations developed to model the individual damage mechanisms are summarized. Based on the microstructural analysis of the key damage features for metallic materials under a wide range of deformation conditions, a set of schematic diagrams is designed to illustrate the major types of damage mechanisms. This helps researchers and engineers to understand the major cause of failure of materials under different deformation conditions and to select simple and appropriate mechanism-based damage equations to predict the damage evolution. Further discussions are carried out on the dominant damage mechanisms in hot metal forming conditions and it is concluded that the dominant damage mechanism can be 'grain boundary (creeptype) damage' or 'plasticity-induced (ductile) damage' depending on the material microstructure and deformation rate. In the case of grain boundary damage in hot forming, the shape of microdefects is different from those in high temperature creep and superplastic forming although all of those result in intergranular failure of materials. Furthermore, damage calibration techniques for different conditions of plastic deformation are summarized and discussed.KEY WORDS: damage mechanisms, damage calibrations, creep and viscoplasticity, cold and hot metal forming.

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Section: Calibration Of Damage Evolution From Cyclic Loading Test Resmentioning

confidence: 94%

A Review on Damage Mechanisms, Models and Calibration Methods under Various Deformation Conditions

Lin

Liu

Dean

2005

International Journal of Damage Mechanics

143

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“…Many attempts have been made to evaluate an appropriate fatigue damage parameter [1][2][3][4][5][6][7][8]. Kaczanow proposed as a damage indicator the density of microcracks identified at the surface in a given volume.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a promising idea of fatigue damage indicator was proposed by Socha [1,2] on the basis of damage accumulation expression given by Azari et al [4,5]. In this case damage parameter is defined using the inelastic strain amplitude.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Damage of Al/SiC Composites - Macroscopic and Microscopic Analysis

Rutecka

Kowalewski

Makowska

et al. 2015

Archives of Metallurgy and Materials

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The results of comparative examinations of mechanical behaviour during fatigue loads and microstructure assessment before and after fatigue tests were presented. Composites of aluminium matrix and SiC reinforcement manufactured using the KoBo method were investigated. The combinations of two kinds of fatigue damage mechanisms were observed. The first one governed by cyclic plasticity and related to inelastic strain amplitude changes and the second one expressed in a form of ratcheting based on changes in mean inelastic strain. The higher SiC content the less influence of the fatigue damage mechanisms on material behaviour was observed. Attempts have been made to evaluate an appropriate fatigue damage parameter. However, it still needs further improvements.Keywords: fatigue, damage, metal matrix composites, microstructure W artykule zaprezentowano wyniki mechanicznych badań w warunkach zmęczenia oraz badań mikrostrukturalnych przed i po testach zmęczeniowych. Badaniom poddano kompozyty o osnowie aluminiowej wzmocnionej węglikiem krzemu SiC wyprodukowane przy użyciu metody KoBo. Zaobserwowano kombinację dwóch mechanizmów uszkodzenia zmęczeniowego. Pierwszy związany z cykliczną plastycznością, a co za tym idzie ze zmianami amplitudy odkształcenia niesprężystego oraz drugi wyrażający się w formie ratchetingu oparty na zmianach średniego odkształcenia niesprężystego. Zaobserwowano również słabnący wpływ mechanizmów uszkodzenia zmęczeniowego na zachowanie badanego kompozytu wraz ze wzrostem zawartości SiC. Podjęto próbę oszacowania odpowiedniego parametru uszkodzenia zmęczeniowego, jednakże wymaga on dalszych udoskonaleń.

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“…The results of some studies prove a classic approach to the determination of fatigue characteristics when based on HCF and LCF tests. In recent years, studies have also appeared that attempt a different approach to the determination of the fatigue life of materials/products [10,11], including those based on hardness testing [12] or applying the idea of neural networks [13,14].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Assessment of Selected Engineering Materials Based on Modified Low-Cycle Fatigue Test

Maj¹

2013

Archives of Foundry Engineering

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In this study, the mechanical tests were carried out on ductile iron of EN-GJS-600-3 grade and on grey cast iron of EN-GJL-250 grade. The fatigue life was evaluated in a modified low-cycle fatigue test (MLCF), which enables the determination of parameters resulting from the Manson-Coffin-Morrow relationship. The qualitative and quantitative metallographic studies conducted by light microscopy on selected samples of ductile iron with spheroidal graphite and grey cast iron with lamellar graphite (showing only small variations in mechanical properties,) confirmed also small variations in the geometrical parameters of graphite related with its content and morphological features.

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Experimental investigations of fatigue cracks nucleation, growth and coalescence in structural steel

Cited by 46 publications

References 3 publications

A Review on Damage Mechanisms, Models and Calibration Methods under Various Deformation Conditions

A Review on Damage Mechanisms, Models and Calibration Methods under Various Deformation Conditions

Fatigue Damage of Al/SiC Composites - Macroscopic and Microscopic Analysis

Fatigue Life Assessment of Selected Engineering Materials Based on Modified Low-Cycle Fatigue Test

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