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  • 1
    Digitale Medien
    Digitale Medien
    Reduction formula for moments of stochastic integrals (1997)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 38 (1997), S. 4763-4770 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: We show how moments of stochastic integrals can be expressed explicitly as expectation values of ordinary Lebesgue integrals. This result generalizes the well known relationship for the second moment. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.532121
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  • 2
    Digitale Medien
    Digitale Medien
    Behaviour of fatigue cracks emanating from circular notches in Ti-6Al-4V under bending (2004)
    PO Box 1354, 9600 Garsington Road, Oxford OX4 2XG, UK. : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 27 (2004), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: This paper is aimed at evaluating the behaviour of small cracks emanating from notches in the Ti-6Al-4V alloy. Pulsating four point bending tests were performed at a nominal stress ratio of 0.1 and a frequency of 15 Hz on prismatic specimens with a central hole. The conditions of initiation and early propagation of fatigue cracks were investigated at two relatively high nominal stress levels corresponding to 56.6 and 100% of the 0.2% yield stress of the material. Microstructural effects were discussed. To this purpose a specific device based on the ‘in situ’ detection of cracks by photomicroscopy was developed. Corresponding results were analysed quantitatively considering the effect of the yielded region at the notch tip by elastic–plastic finite element modelling. Furthermore, information regarding the sites of fatigue crack initiation and propagation path were discussed on the basis of careful fractographic analysis of the specimens. The importance of the two phase α, β microstructure on the material damage was highlighted and correlated to the observed oscillations in the crack growth rate. Mechanically and microstructurally long cracks were correlated by linear-elastic fracture mechanics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.2004.00731.x
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  • 3
    Digitale Medien
    Digitale Medien
    Parametric study of oblique edge cracks under cyclic contact loading (2005)
    PO Box 1354, 9600 Garsington Road, Oxford OX4 2XG, UK. : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 28 (2005), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: The problem of a two-dimensional elastic body, carrying an inclined edge crack and loaded by a cylinder rolling on the surface, is solved by the weight function method. The load induced by the cylinder on the cracked body was represented by the Hertzian pressure distribution, and the nominal stress distribution in the uncracked body was numerically evaluated by the superposition principle. The crack opening displacement components were obtained by an analytical Green's function. The partial crack closure was considered and the influence of the mutual forces between the crack faces included in the analysis, by which the effective stress intensity factors KI and KII could be evaluated. By considering different friction conditions between the crack surfaces and several crack inclinations, the evolutions of the effective KI and KII during typical loading cycles were analysed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.2004.00860.x
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  • 4
    Digitale Medien
    Digitale Medien
    WEIGHT FUNCTIONS APPLIED TO FATIGUE CRACK GROWTH ANALYSIS (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 20 (1997), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: Abstract— An overview is presented of studies conducted at the University of Pisa on the Weight Function technique as applied to Fatigue Crack Grown analysis. The fundamental theoretical aspects of the technique are summarised, discussing some recent methods for the determination of the Weight Function. The application of the technique to non-linear (contact) problems and to the evaluation of the crack tip stress field is also discussed. It is shown that the Weight Function method allows one to efficiently consider many crack propagation problems, some examples of which are provided.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1997.tb00315.x
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  • 5
    Digitale Medien
    Digitale Medien
    FATIGUE CRACK GROWTH IN RESIDUAL STRESS FIELDS: EXPERIMENTAL RESULTS AND MODELLING (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 17 (1994), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: Abstract— The paper discusses the results of fatigue crack growth rate tests conducted in the presence of residual stresses. Three different residual stress distributions, obtained by laser welds, were employed in order to characterize the crack propagation behaviour under different conditions, producing either an increase or a reduction of the stress intensity factor due to external loads. Test results are analysed by means of a non-linear numerical model (based on the weight function method) and a knowledge of the fatigue crack growth properties of the base material, free from residual stresses. The results of the analysis are discussed with reference to experimental trends, in order to clarify the predictive capabilities of the method and aspects needing further investigation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1994.tb00786.x
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  • 6
    Digitale Medien
    Digitale Medien
    Proton relaxation of water solutions containing copper carbonic anhydrase
    Amsterdam : Elsevier
    Inorganica Chimica Acta 23 (1977), S. L15-L16 
    Details
    ISSN: 0020-1693
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)94720-0
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  • 7
    Digitale Medien
    Digitale Medien
    Propagation of Fatigue Cracks Emanating from Sharp Notches under Different Loading Direction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 461-464 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The present paper is aimed at investigating the behaviour of fatigue cracks emanatingfrom sharp V-shaped notches. To this purpose, several tests has been conducted on Al-7075-T651notched specimens using a servohydraulic machine by changing the directions and levels of theapplied load. The crack growth have been interpreted on the basis of a linear elastic fracturemechanics approach by adopting a weight function derived by the authors for the calculation of thestress intensity factors (SIFs) of inclined edge-cracks emanating from V-shaped notches
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.461.pdf
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  • 8
    Digitale Medien
    Digitale Medien
    Genetic Algorithms for Variable Through Thickness Residual Stress Evaluation (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 347-349 (May 2000), p. 144-149 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/05/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.347-349.144.pdf
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  • 9
    Digitale Medien
    Digitale Medien
    Fretting Fatigue Apparatus for Shrink-Fitted Shaft Assembly (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 7-8 (Aug. 2007), p. 43-48 
    Details
    ISSN: 1662-7482
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The present paper proposes a new test rig to perform fretting fatigue tests on a shrinkfittedshaft assembly. A shrink-fitted shaft is put under rotating bending by means of an eccentricoffset at one end. The shaft is driven near to its first resonance condition to significantly reduce therequired force to produce bending. Test parameters are the imposed bending stress amplitude, andthe hub radial pressure obtained through conical fitting. The proposed apparatus allows forchanging bending stress amplitude and hub pressure to generate fretting fatigue tests at differentconditions. In particular, the role of slip amplitude in fretting fatigue can be investigated. At thepresent stage the proposed apparatus is under construction at the Mechanical Department of theUniversity of Pisa
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.7-8.43.pdf
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  • 10
    Digitale Medien
    Digitale Medien
    The stochastic Burgers Equation (1994)
    Springer
    Communications in mathematical physics 165 (1994), S. 211-232 
    Details
    ISSN: 1432-0916
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Abstract We study Burgers Equation perturbed by a white noise in space and time. We prove the existence of solutions by showing that the Cole-Hopf transformation is meaningful also in the stochastic case. The problem is thus reduced to the anaylsis of a linear equation with multiplicativehalf white noise. An explicit solution of the latter is constructed through a generalized Feynman-Kac formula. Typical properties of the trajectories are then discussed. A technical result, concerning the regularizing effect of the convolution with the heat kernel, is proved for stochastic integrals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02099769
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