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  • 1985-1989  (8)
  • 1980-1984  (8)
  • 1965-1969  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    Approximate stress intensity factor for an embedded elliptical crack near two parallel free surfaces (1965)
    Springer
    International journal of fracture 1 (1965), S. 81-95 
    Details
    ISSN: 1573-2673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Résumé Un facteur approché d'intensité de contrainte est obtenu pour une fracture elliptique encastrée dans une plaque soumise à une tension uniaxiale dans la direction perpendiculaire à la surface de la fracture. Le grand axe d'une fracture elliptique excentrique est supposé être parallèle aux deux surfaces de la plaque. Les facteurs approches d'intensité de contrainte, le long du petit axe de la fracture elliptique sont déterminés par αBσ√a √π où a est un facteur de correction dû à la courbure de l'ellipse et β est un facteur de correction dû à l'excentricité de la fracture dans le mur.
    Kurzfassung: Zusammenfassung Es wird ein angenaeherter Faktor fuer die Spannungskonzentration an einem elliptischen Riss, der in einen Platte unter einachsiger Zugspannung eingeschlossen ist, abgeleitet. Die Zugspannungsrichtung ist senkrecht zur Rissoberflaeche. Es wird angenommen, dass die Hauptachse des exzentrisch gelagerten Risses parallel zu den beiden Plattenoberflaechen ist. Fuer den angenaeherten Faktor der Spannungskonzentration an der kleineren Hauptachse des elliptischen Risses ergibt sich dann αBσ√a√π wobei α ein Korrekturfaktor fuer die Ellipsenkruemmung ist und β einen Korrekturfaktor fuer die Exzentrizitaet des Risses in der Platte bedeutet.
    Notizen: Abstract An approximate stress intensity factor is derived for an embedded elliptical crack in a plate which is subjected to uniaxial tension in the direction perpendicular to the crack surface. The major axis of an eccentrically located elliptical crack is assumed to be parallel with the two plate surfaces. The approximate stress intensity factors on the minor axis of the elliptical crack are then determined as αBσ√a√π where a is a correction factor due to the curvature of the ellipse and 6 is a correction factor due to the eccentricity of the crack in the wall.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00186746
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  • 2
    Digitale Medien
    Digitale Medien
    Double noding technique for mixed mode crack propagation studies (1984)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 20 (1984), S. 967-977 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: A simple dynamic finite element algorithm for analysing a propagating mixed mode crack tip is presented. A double noding technique, which can be easily incorporated into existing dynamic finite element codes, is used together with a corrected Ĵ integral to extract modes I and II dynamic stress intensity factors of a propagating crack. The utility of the procedure is demonstrated by analysing test problems involving a mode I central crack propagating in a plate subjected to uniaxial tension, a stationary slanted central crack in a plate subjected to uniaxial inpact loading and an extending slanted-edge crack in plate subjected to uniaxial tension.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620200512
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  • 3
    Digitale Medien
    Digitale Medien
    A dynamic analysis of modified compact-tension specimens using homalite-100 and polycarbonate plates (1980)
    Springer
    Experimental mechanics 20 (1980), S. 73-79 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The dynamic fracture and crack-arrest responses of a modified compact-tension specimen (M-CT) machined from Homalite-100 and polycarbonate sheets were studied by dynamic photoelasticity, dynamic finite-element analysis and streaking photography. In contrast to some of the published results involving steel M-CT specimens, substantial dynamic effects were observed during rapid crack propagation in the Homalite-100 and polycarbonate M-CT specimens. The dynamic crack-arrest toughnesses.K 1a , were relatively constant and were about 80 percent and 50 percent of the corresponding fracture toughness,K 1c , of Homalite-100 and polycarbonate, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02321231
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  • 4
    Digitale Medien
    Digitale Medien
    A feasibility study of detecting reinforcing-bar debonding by acoustic-emission technique (1980)
    Springer
    Experimental mechanics 20 (1980), S. 301-308 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Acoustic emissions (AE) detected by two transducers mounted on a reinforcing bar in a reinforced-concrete block, which is subjected to cyclic tension-compression loading, are used to assess the locations of re-bar debonding. Preliminary uniaxial-tension tests of the re-bar were conducted to establish the proper level of AE sensitivity which was then verified by uniaxial-tension tests of re-bar embedded in a concrete block. The main tests consist of simulated beamcolumn connection with a 90-deg hooked No. 8 Grade 60 rebar subjected to various cyclic-loading histories. Reasonably good correlations were established between the debonding regions indicated by the AE signals and those detached by dye injected into the cracked concrete.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02328623
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  • 5
    Digitale Medien
    Digitale Medien
    J resistance curves in aluminum SEN specimens using Moiré interferometry (1988)
    Springer
    Experimental mechanics 28 (1988), S. 154-158 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract TheU y -displacement field obtained by white-light moiré interferometry were used to estimate the approximate far- and near-fieldJ-integral values associated with the subcritical crack growths in fatigue precracked 7075-T6 and blunt notched and fatigue precracked 2024-0 and 5052-H32 aluminum, single-edged notch (SEN) specimens. The initial phases of theJ-resistance curves for the somewhat brittle 7075-T6 and the two ductile 2024-0 and 5052-H32 aluminum SEN specimens are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02317566
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  • 6
    Digitale Medien
    Digitale Medien
    Temperature distributions and thermal stresses in a partially filled annulus (1966)
    Springer
    Experimental mechanics 6 (1966), S. 602-608 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The problem consists of determining the temperature distribution and the thermal stresses in an annulus partly filled with a cold fluid with free convection in air as the outer thermal-boundary condition. An iterative computer solution provided temperature distributions which were compared to those measured experimentally. Analytical calculations of the stresses using Fourier series expression for the temperature distribution agreed with experimental results by photothermoelasticity. The stress-intensity factors determined by photothermoelasticity for partly filled annuli with a crack extending radially 1/5 of the wall thickness were compared with approximate analytical methods.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02326828
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  • 7
    Digitale Medien
    Digitale Medien
    Stable crack growth in aluminum tensile specimens (1987)
    Springer
    Experimental mechanics 27 (1987), S. 234-245 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Post's white-light moiré interferometry was used to obtain sequential records of the transientU y -displacement fields associated with stable crack growth in 7075-T6 and 2024-0, single-edge-notched (SEN) specimens with fatigued cracks. TheU y -displacement fields are used to evaluate the crack-tip opening displacement (CTOD), far- and near-fieldJ-integral values, Dugdale-strip-yield model, William's polynomial function and the HRR field.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02318088
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  • 8
    Digitale Medien
    Digitale Medien
    Dynamic stress-intensity factors for unsymmetric dynamic isochromatics (1981)
    Springer
    Experimental mechanics 21 (1981), S. 41-48 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The mixed mode, near-field state of stresses sourrounding a crack propagating at constant velocity is used to derive a relation between the dynamic stress-intensity factorsK I,K II, the remote stress component σ ox and the dynamic isochromatics. This relation, together with an over-deterministic least-square method, form the basis of a datareduction procedure for extracting dynamic,K I,K II and σ ox from the recorded dynamic photoelastic pattern surrounding a running crack. The overdeterministic least-square method is also used to fit static isochromatics to the numerically generated dynamic isochromatics. The resultant staticK I,K II and σ ox are compared with the corresponding dynamic values and estimats of errors involved in using static analysis to process dynamic isochromatic data are obtained. The data-reduction procedure is then used to evaluate the branching stress-intensity factor associated with crack branching and the mixed-mode stress-intensity factors associated with crack curving.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02325929
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  • 9
    Digitale Medien
    Digitale Medien
    Interfacial fracture of space-shuttle thermal-protection system (1982)
    Springer
    Experimental mechanics 22 (1982), S. 454-461 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Stable crack growth and fracture at the interface of undensified LI-900 reusable surface insulation (RSI) tile and the Nomex strain isolation pad (SIP) of the space-shuttle thermal-protection system (TPS) were modeled by double-edged notch-tension specimens. These specimens were loaded under uniaxial tension or 50-Hz cyclic loading and the resultant stable crack growth leading to eventual fracture was monitored by a videocamera. These tests showed that successive local tear-outs due to local tensile overload in the RSI tile resulted in the interfacial fracture where the cracktip opening angle, CTOA, of the SIP was related to initiation and intermittent stable crack propagation. Fractures in similar static and dynamic test specimens using densified LI-900 RSI tiles occurred in the undensified regions of the RSI tiles. These failures were consistent with the above failure mechanism based on the local tensile strength of the undensified LI-900 RSI tile. The intermittent stable crack growth of undensified LI-900 RSI tile was reproduced by a deterministic, two-dimensional finite-element model with SIP of variable elastic moduli.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02325423
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  • 10
    Digitale Medien
    Digitale Medien
    Transient analysis in a fracturing magnesium plate (1967)
    Springer
    Experimental mechanics 7 (1967), S. 434-440 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Transient displacement and strain distributions in the vicinity of running-crack tips were determined experimentally in centrally notched magnesium plates. The moiré-fringe technique was used together with a Q-spoiled laser which was the light source for single-flash photography. The specimen was designed such that net-section yield occurred prior to fracture and, thus, the crack propagated through the yielded region. Displacement distributions in the vicinity of such running-crack tips were found to vary as $$\sqrt r $$ for radial distances as close asr=0.08 in. Transient moiré-fringe patterns were then differentiated graphically to obtain longitudinal strain distributions in the vicinities of running-crack tips. These transient-displacement and transient-strain distributions were compared with equivalent static results. For this ductile material, both the transient and static results showed qualitative agreement with the displacement and strain distributions in an infinitely elastic plate in the region ahead of the crack tip. For the region above the crack tip, the transient and static results differed appreciably.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02326302
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