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  • 1995-1999  (3)
  • 1990-1994  (3)
  • 1975-1979  (6)
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  • 1
    Digitale Medien
    Digitale Medien
    Process zone of polycrystalline alumina (1999)
    Springer
    Experimental mechanics 39 (1999), S. 20-24 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The fracture process zone of two polycrystalline alumina fracture specimens were analyzed by a hybrid experimental-numerical procedure involving a phase-shifting moiré interferometry and a finite element analysis. The dissipated energy, which was obtained through numerical analysis, in the fracture process zone was found to be the major energy dissipation mechanism in the brittle alumina.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02329296
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  • 2
    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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  • 3
    Digitale Medien
    Digitale Medien
    A bar impact tester for dynamic fracture testing of ceramics and ceramic composites (1992)
    Springer
    Experimental mechanics 32 (1992), S. 109-116 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A bar impact test was developed to study the dynamic fracture responses of precracked ceramic bars, Al2O3 and 15/29-percent volume SiCw/Al2O3. Crack-opening displacement was measured with a laser-interferometric displacement gage and was used to determine the crack velocity and the dynamic stress-intensity factorK I dyn . The crack velocity andK I dyn increased with increasing impact velocity while the dynamic-initiation fracture toughness,K Id, did not vary consistently with increasing impact velocities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02324721
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  • 4
    Digitale Medien
    Digitale Medien
    Energy-dissipation mechanisms associated with rapid fracture of concrete (1993)
    Springer
    Experimental mechanics 33 (1993), S. 205-211 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A hybrid experimental-numerical procedure, involving moiré interferometry and dynamic finite-element analysis, was used to analyze rapid crack growth in an impact loaded three-point-bend concrete specimen with an offset straight precrack. The dissipated energy rates in the fracture process zone (FPZ), which trails the rapidly extending crack, and in the frontal FPZ ahead of the crack tip, the kinetic-energy rate and energy-release rate were computed. The results showed that while the trailing FPZ was the dominant energy dissipation mechanism, much of the released energy was converted to kinetic energy in the fracturing concrete specimen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02322574
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  • 5
    Digitale Medien
    Digitale Medien
    A biaxial test specimen for crack arrest studies (1996)
    Springer
    Experimental mechanics 36 (1996), S. 277-283 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A biaxially loaded, single edge notched (SEN) fracture specimen, with mixed modes I and II loading, was used to study the crack arrest capability of a bonded and riveted tear strap without and with simulated multiple site damage (MSD). MSD was modeled by a 50-percent groove without which the running crack would inevitably kink due to KII loading. A total of thirty-one 2024-T3 aluminum specimens with various crack and MSD configurations were tested. The fracture parameters associated with straight and curved crack paths were determined by using the experimenta results to drive a dynamic finite element model of the specimen in its generation mode. The crack kinking and extension criteria were verified by the excellent agreement between the prediction based on these fracture parameters and the measured crack kinking angles. Comparison between the test results generated by the biaxial stress specimens and by those generated by small- and full-scale pressurized fuselage rupture experiments showed that this specimen can be used to prescreen the effectiveness of tear straps and crack arrestors in an airplane fuselage.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02318019
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  • 6
    Digitale Medien
    Digitale Medien
    Photoelastic investigation on the Crack-arrest capability of a pretensioned stiffened plate (1975)
    Springer
    Experimental mechanics 15 (1975), S. 1-9 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Dynamic photoelasticity, employing a 16-spark-gap Cranz-Schardin camera system, was used for dynamic analysis of propagating cracks in stiffened panels. The method of finite elements was used for a corresponding static analysis. Photoelastic models included 0.009525×0.25×0.25 m Homalite-100 plates with 10- and 25-percent pin-joined and bonded stringers. Static and dynamic strain-energy release rates, kinetic-energy release rates and stringer-load concentration factors were determined in stiffened panels that were pretensioned and then impacted by a projectile. It was found that the arrest capability of a stiffened panel could be assessed through the kinetic-energyrate concept. Also bonded stiffeners were found to be more effective in arresting a propagating crack than a corresponding pin-joined stiffened panel.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02318518
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  • 7
    Digitale Medien
    Digitale Medien
    A dynamic photoelastic analysis of dynamic-tear-test specimen (1976)
    Springer
    Experimental mechanics 16 (1976), S. 176-181 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Dynamic photoelasticity was used to analyze the transient response of dynamic-tear-test (DTT) specimens, .0889×.400m (3.5×15 in.) in size, machined from .0095m (3/8 in.)-thick Homalite-100 plates. Dynamic-stress-intensity factors, dynamic-energy release rates, and crack velocities in ten specimens were determined. Dynamic tear energies were obtained by integrating the area under the dynamic-energy release-rate curves. The average dynamic-energy release rates which were obtained by dividing the dynamic tear energies by the total length of the crack paths, were found to be approximately equal to the critical strain-energy release rate of Homalite-100. Results of the drop-weight-hammer impact vs. crack-initiation experiments showed that the crack initiated after the first buildup of impact forces in the hammer, thus indicating possible ambiguity in using a specified location on the hammer-force curve to derive a comparable static-fracture load for the DTT specimen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02327995
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  • 8
    Digitale Medien
    Digitale Medien
    Dynamic-finite-element and dynamic-photoelastic analyses of two fracturing homalite-100 plates (1976)
    Springer
    Experimental mechanics 16 (1976), S. 321-328 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A dynamic-finite-element code, HONDO, was used to analyze two single-edged-notch fracturing Homalite-100 plates which had been previously studied by dynamic photoelasticity. A single-edged crack in the finite-element model was advanced in incremental jumps such that the time-averaged crack velocity matched the measured crack velocity in the Homalite-100 plate. Dynamic-energy-release rates were computed for a constant-velocity crack and a crack which arrested after a somewhat constant deceleration. These results were compared with the corresponding dynamic-energy-release rates, which were computed from the dynamic-stress-intensity factors determined by dynamic photoelasticity, and with static-strain energyrelease rates. Despite the crude modeling of the running crack, the coarseness of the finite-element-grid breakdown and the differences in the modeled and actual grip conditions, the computed and measured dynamic-energy-release rates, except for occasional large differences, generally agreed within 10 percent of each other.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02330248
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  • 9
    Digitale Medien
    Digitale Medien
    Dynamic fracture toughness of Homalite-100 (1978)
    Springer
    Experimental mechanics 18 (1978), S. 11-18 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Dynamic fracture toughness of Homalite-100 determined by T. Kobayashi and Dally are compared with those previously obtained by the authors where similarities in the two results for single-edged-notch specimens of various configurations are noted. Dynamic fracture toughness of Araldite B obtained by Kalthoff, Beinert and Winkler and those of Homalite-100 obtained by the authors are then compared and, again, similarities in the two results and, in particular, the scatters in experimental data for wedge-loaded DCB specimens of different sizes are found. All three teams of investigators used static near-field solution to compute the dynamic stress-intensity factors from recored dynamic isochromatics or dynamic caustics. Errors generated through this use of static near-field solutions, as well as through the use of larger isochromatic lobes, are thus discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02326552
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  • 10
    Digitale Medien
    Digitale Medien
    Dynamic photoelastic and dynamic finite-element analyses of dynamic-tear-test specimens (1978)
    Springer
    Experimental mechanics 18 (1978), S. 449-456 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The transient response of the dynamic-tear-test specimen of a brittle material, Homalite-100, was investigated by dynamic photoelasticity and dynamic finite-element method. The dynamic stress-intensity factors obtained from dynamic photoelasticity and dynamic finite-element analyses were in reasonable agreement with each other. The dynamic finite-element analysis also showed that the dynamic-fracture-initiation toughness could be determined from the dynamicstrain response of a strain gage located near the crack tip in conjunction with a simple static analysis. Dynamic-fracture-toughness vs. crack-velocity relation was also obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02324280
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