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  • Artikel  (2.310)
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  • 1
    Digitale Medien
    Digitale Medien
    AN EGF EXERCISE IN PREDICTING DUCTILE INSTABILITY: PHASE 2, CRACKED PRESSURE VESSEL (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: This report discusses the results of a collaborative European Group on Fracture exercise to predict the pressure-crack size relationships of an experimental cracked pressure vessel which was undergoing tests for the CEGB. The details of the test and background mechanical properties data had been circulated to interested parties with a request for predictions to be returned prior to the vessel test results being published. The results of this exercise are described here, analysed in detail and compared with the test results.Collectively, eighteen individuals provided thirty eight different estimates of the vessel behaviour. The procedures used included R6 and variants of it, crack tip opening displacement approaches, engineering J design curve approaches, simple plastic collapse criteria and the GE J estimation scheme.Analysis of the predictions showed that:(1) in the prediction of maximum pressures, the plastic limit pressure was important;(2) in the prediction of initiation pressures the initiation toughness dominated;(3) the detailed form of the resistance curve had little influence on either the crack growth predictions or the maximum pressure predictions.(4) all forms of failure assessment diagram based upon the R6 axes were capable of producing accurate predictions.(5) where a poor model was used to represent the cracked section the results were unsatisfactory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb00451.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    FATIGUE LIFE PREDICTION FOR GAUSSIAN RANDOM LOADS AT THE DESIGN STAGE (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: Fatigue life prediction under variable amplitude loading normally involves a two stage process of cycle counting and damage summation. This paper shows that for certain classes of strain history, predictions can be made directly from a knowledge only of the power spectral density of the strain history and conventional fatigue strength data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb00444.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    A STUDY OF SHORT CRACK GROWTH IN TORSIONAL LOW CYCLE FATIGUE FOR A MEDIUM CARBON STEEL (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: A study of short crack growth for a medium carbon steel in low cycle torsional fatigue has been carried out in order to measure crack length and derive growth laws. Comparison with a previous analysis of uniaxial tests in low cycle fatigue for the same material provides a tentative basis for formulating an equivalent stress approach to describe uniquely the propagation of short cracks under multiaxial stress.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb01208.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    COMPARISON OF SHORT AND LONG FATIGUE CRACK GROWTH IN 7075-T6 ALUMINUM (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: The fatigue crack growth rates of physically-short cracks (0.5 ≤a≤ 1.0 mm), intermediate cracks (1 〈 a≤ 2 mm) and long cracks (7 〈 a 〈 25 mm) were compared using SEN type tensile specimens in 7075-T6 aluminum alloy with load ratios, R, of 0.05, − 1 and 0.5 under constant amplitude testing at room temperature. It was found that the short cracks grew much faster than long cracks based on applied δK with da/dN≤ 10−7 m/cycle. Even the intermediate cracks grew faster than the long cracks below 10−7 m/cycle. The transition crack lengths where similitude with δK existed was between 1 and 2 mm. Mean stress effects were similar for R= 0.05 and − t, but R= 0.5 caused increased crack growth rates. The above differences are partially attributed to crack closure effects. Based upon plastic zone sizes, LEFM was justifiable with all the experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb01209.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    THE EFFECTS OF SUB-CRITICAL CRACK GROWTH ON THE FRACTURE BEHAVIOUR OF CRACKED FERRITIC STEELS AFTER WARM PRESTRESSING (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: The effects of sub-critical crack extension on the fracture properties of ferritic steels after they have been subjected to warm prestressing are investigated. The crack growth is assumed to occur at the temperature of the final loading, after the warm prestressing and the subsequent unloading. Predictions of the fracture behaviour are made using continuum mechanics and a fracture criterion based on a modified J-integral. The results of these calculations are consistent with those of a micromechanistic model of cleavage fracture from a sharp crack. Both the theories predict that the beneficial elevation in fracture load produced by warm prestressing is maintained after sub-critical crack growth provided the latter is not greater than the compressive yielded zone formed on unloading.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb00452.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Fourth International Conference on NUMERICAL METHODS IN FRACTURE MECHANICS (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb00435.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    CYCLIC CREEP ACCELERATION AND RETARDATION IN Cr-Mo-V ROTOR STEEL AT AMBIENT AND ELEVATED TEMPERATURE RESPECTIVELY (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: The cyclic creep properties of Cr-Mo-V rotor steel have been explored at room temperature and elevated temperature by multiple-step tests with increasing maximum stress (R= 0), and with subsequent tests in partial unloading (0 ≤R 〈 1). Cyclic creep acceleration is observed at room temperature and cyclic creep retardation at elevated temperature. This behavior is explained in terms of cyclic softening at low temperature and by creep-dominated deformation at high temperature with a ferritic material considered especially prone to retardation because of the high diffusivity of b.c.c. material. Other interesting effects, such as strain burst phenomena and the observation of anomalously high values of the ratio of diametral strain to axial strain, are also reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb00448.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    ON FATIGUE CRACK SIZE DISTRIBUTIONS IN COPPER SINGLE CRYSTALS (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: Measurements of crack depths by newly developed sectioning techniques raise questions about the validity of the optical microscopy technique used by Cheng and Laird for measuring crack size distributions. Accordingly, these measurements have been repeated using an improved technique. The cracks have thus been found deeper than reported earlier. This result suggests that random-walk mechanisms for crack nucleation apply to the earliest stages of fatigue life. Moreover, it is found that the crack size distribution matches the distribution of local strains in persistent slip bands, suggesting that Stage I crack propagation kinetics are controlled by the local plastic strain.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb00439.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    THE SECOND INTERNATIONAL CONFERENCE ON LOW CYCLE FATIGUE AND ELASTO-PLASTIC BEHAVIOUR OF MATERIALS (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb01204.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    EDITORIAL: SOFTWARE SURVEY SECTION (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 9 (1986), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1986.tb01206.x
    Standort Signatur Erwartet Verfügbarkeit
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