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  • 1
    Digitale Medien
    Digitale Medien
    FRACTURE MECHANICS APPLICATIONS TO DRILLING AND BLASTING (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— This paper gives a brief review of research in rock fracture mechanics as conducted at the Fracture and Photo-Mechanics Laboratory (FPML) at Vienna University of Technology. The mechanisms pertaining to percussion drilling and blasting are investigated, with specific reference to the application of fracture mechanics. In order to gain an improved understanding of the mechanisms controlling rock fragmentation, a multidisciplinary approach is followed which includes laboratory experiments conducted in plexiglass and rock, in-situ field experiments and analytical/numerical modelling techniques.Field experiments revealed that percussively drilled holes exhibit a very shallow region of damaged rock. An analytical model to simulate damage accumulation and crack initiation due to elastic waves generated by impacting drill bits was developed. This model, based on damage and fracture mechanics, was incorporated into a numerical finite difference code. Fracture and damage mechanics parameters are related to the moment tensor which is determined experimentally by means of acoustic emission. Small scale model blasts were used to investigate the blast-induced fractures in the near-borehole zone as well as in the far field. Analytical and numerical investigations give insight into stress wave and gas driven fracturing. The applicability of the dynamic finite difference program SWIFD to the interaction between stress waves and cracks is illustrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1997.tb01515.x
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  • 2
    Digitale Medien
    Digitale Medien
    Enrichment of an amino acid by micellar-enhanced ultrafiltration
    Amsterdam : Elsevier
    Journal of Fermentation and Bioengineering 76 (1993), S. 306-310 
    Details
    ISSN: 0922-338X
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0922-338X(93)90199-I
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    The relation between stress and particle velocity for Rayleigh pulses (1998)
    Springer
    Acta mechanica 131 (1998), S. 247-253 
    Details
    ISSN: 1619-6937
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Summary In this note, the relationship between the stress and the particle velocity for Rayleigh pulses which propagate along a free surface of an elastic isotropic half-space is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01177228
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  • 4
    Digitale Medien
    Digitale Medien
    Copolymerisation von CO-2 und Prouvlenoxid mit neuen Katalysatoren (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 109-109 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01539048
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  • 5
    Digitale Medien
    Digitale Medien
    Microstructure of mechanically alloyed Al-In alloys (1994)
    Springer
    Journal of materials science 29 (1994), S. 4860-4865 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Mechanical alloying (MA) starting from elemental powder mixtures was performed on immiscible Al-10, 30 and 50 at % In alloys. Al and In were finely mixed with increasing MA time and the crystal size of each element became up to 40 nm after MA for 1152 ks. With refinement of the structure, the hardness increased up to 120 H v in Al-10 at % In alloy, a value larger than that obtained from the rule of mixtures. The melting temperature of In was recognized, by thermal analyses, to fall by about 3 K for mechanically alloyed Al-In alloy, showing the possibility of forming f.c.t In supersaturated solid solution. A new endothermal peak around 420 K, which corresponded with the melting temperature of metastable f.c.c. In, was recognized for mechanically alloyed Al-50 at % In alloy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00356535
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  • 6
    Digitale Medien
    Digitale Medien
    Nano-structured intermetallic compound TiAl obtained by crystallization of mechanically alloyed amorphous TiAl, and its subsequent grain growth (2000)
    Springer
    Journal of materials science 35 (2000), S. 2897-2905 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The amorphization process during mechanical alloying (MA) was investigated for the Al-50at%Ti and Al-50at%Ti-10vol%TiB2 powder mixtures. Pure metallic powders of Al and Ti were finely mixed and transformed to the amorphous phase after being milled for about 2880 ks. In the case of Al-50at%Ti-10vol%TiB2 powder, the amorphous alloys with a fine dispersion of TiB2 particles could be obtained for a shorter milling times than that required for the powders without TiB2 ceramics. As a result of heat treatment for the mechanically alloyed amorphous powders, a nanocrystalline intermetallic compound of TiAl (γ) could be produced. Subsequent grain growth of the γ phase during heat treatment was investigated by estimating the grain-growth exponent and the activation energy for grain growth. It was found from this estimation that the grain growth was further suppressed as the powders were mechanically alloyed for longer times. Furthermore, the addition of the TiB2 particles that could be dispersed during MA finely and homogeneously in the amorphous matrix was found to be effective for suppression of the γ grain growth especially at elevated temperatures as well as for a long annealing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004771808047
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