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  • 1995-1999  (3)
  • 1985-1989  (8)
  • 1980-1984  (8)
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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    Digitale Medien
    Digitale Medien
    Axial crack propagation and arrest in a pressurized cylinder: An experimental-numerical analysis (1999)
    Springer
    Experimental mechanics 39 (1999), S. 256-264 
    Details
    ISSN: 1741-2765
    Schlagwort(e): Dynamic fracture ; crack kinking ; crack arrest ; fuselage rupture ; tear strap
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The feasibility of using a previously developed crack-kinking criterion to predict crack arrest at a tear strap in a pressurized fuselage was studied with instrumented axial rupture tests of 21 models of an idealized fuselage. A rapidly propagating axial crack, which was initiated from a precrack, kinked immediately upon extension and propagated diagonally until it turned circumferentially and propagated along the tear straps. An elastodynamic finite element analysis of the rupturing model fuselage yielded the mixed-mode stress intensity factors,K I andK II , and the remote stress component, σ OX . This numerical procedure was also used to predict the crack trajectories in full-scale fuselage rupture tests. All numerical results agreed well with their measured counterparts regardless of size.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02329802
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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    Digitale Medien
    Digitale Medien
    Mechanics of crack curving and branching — a dynamic fracture analysis (1985)
    Springer
    International journal of fracture 27 (1985), S. 187-201 
    Details
    ISSN: 1573-2673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Résumé Une étude comparative sur les eritères d'incurvation et d'arborescence d'une fissure en mécanique de rupture dynamique montre qu'un critère basé sur le concept de “fissuration avancée” présente la meilleure corrélation avec les données expérimentales disponibles. Le critère d'arborescence d'une fissure requiert comme condition nécessaire un facteur d'intensité de contrainte dynamique critique, K Ib, et comme condition suffisante un critère tenant compte de l'incurvation de la fissure. Les critères sont utilisés pour prédire l'incurvation et l'arborescence d'une fissure au cours d'expériences photo-élastiques en condition dynamique mettant en oeuvre de l'Homalite 100 et du polycarbonate ainsi que des tubes d'acier et d'aluminium en cours d'explosion.
    Notizen: Abstract A comparative study on crack curving and branching criteria in dynamic fracture mechanics shows that the criteria based on “advanced cracking” concept correlated best with available experimental data. The crack branching criterion requires as a necessary condition, a critical dynamic stress intensity factor, K Ib, and a sufficient condition involving the crack curving criterion. The criteria are used to predict crack curving and crack branching in dynamic photoelastic experiments involving Homalite-100 and polycarbonate fracture specimens, as well as bursting steel and aluminum pipes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00017967
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  • 10
    Digitale Medien
    Digitale Medien
    Dynamic fracture toughness (1986)
    Springer
    International journal of fracture 30 (1986), S. 275-285 
    Details
    ISSN: 1573-2673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Résumé On passe en revue les relations entre la ténacité à la rupture dynamique et la vitesse de propagation d'une fissure, dans le cas de l'Homalite-100, du polycarbonate, de l'acier 4340 durci, et de nitrure de silicium assemblé par liaisons chimiques. On relève les divergences par rapport aux données publiées, et leurs causes probables. On attribue la dispersion des données en partie aux fluctuations observées dans les vitesses de la fissure. Les résultats confirment les conclusions précédemment exprimées, selon lesquelles d'une part la relation qui lie la ténacité à la rupture dynamique à la vitesse de la fissure dépend de l'éprouvette, et d'autre part le facteur dynamique d'intensité de contraintes correspondant à l'arrêt d'une rupture n'est pas une propriété univoque du matériau.
    Notizen: Abstract Dynamic fracture toughness versus crack velocity relations of Homalite-100, polycarbonate, hardened 4340 steel and reaction bonded silicon nitride are reviewed and discrepancies with published data and their probable causes are discussed. Data scatter in published data are attributed in part to the observed fluctuations in crack velocities. The results reaffirmed our previous conclusion that the dynamic fracture toughness versus crack velocity relation is specimen dependent and that the dynamic crack arrest stress intensity factor is not a unique material property.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00019707
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