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  • 1980-1984  (8)
  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: 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.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620200512
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328623
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Further studies on dynamic crack branching (1983)
    Springer
    Experimental mechanics 23 (1983), S. 431-437 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The newly derived dynamic-crack-branching criterion with its modifications is verified by the dynamicphotoelastic results of dynamic crack branchings in thinpolycarbonate, single-edged crack-tension specimens. Successful crack branching was observed in four specimens and unsuccessful branching in another. Crack branching consistently occurred when the necessary conditions ofK I =K I b =3.3 MPa $$\sqrt m$$ and the sufficiency condition ofr o =r c =0.75 mm were satisfied simultaneously. In the unsuccessful branching test, the necessary condition was not satisfied sinceK I was always less thanK I b .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02330060
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02321231
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Interfacial fracture of space-shuttle thermal-protection system (1982)
    Springer
    Experimental mechanics 22 (1982), S. 454-461 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325423
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamic crack curving—A photoelastic evaluation (1983)
    Springer
    Experimental mechanics 23 (1983), S. 1-9 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A dynamic-crack-curving criterion, which is valid under pure Mode I or combined Modes I and II loadings and which is based on either the maximum circumferential stress or minimum strain-energy-density factor at a reference distance ofr 0 from the crack tip, is verified with dynamic-photoelastic experiments. Directional stability of a Mode I crack propagation is attained when $$r_o= \frac{1}{{128\pi }}(\frac{{K_r }}{{\sigma _{ox} }})^2 V_o^2 (C,C_1 ,C_2 ) 〉 r_c $$ wherer c =1.3 mm for Homalite-100 used in the dynamic-photoelastic experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328674
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic stress-intensity factors for unsymmetric dynamic isochromatics (1981)
    Springer
    Experimental mechanics 21 (1981), S. 41-48 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325929
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Crack-tip dynamic isochromatics in the presence of small-scale yielding (1982)
    Springer
    Experimental mechanics 22 (1982), S. 132-138 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A plasticity correction factor for the dynamic stress-intensity factor,K I dyn , associated with a propagating crack tip in the presence of small-scale yielding, is derived from Kanninen's solution for a constant-velocity Yoffe crack with a Dugdale-strip yield zone. Distortions in the otherwise elastic isochromatics surrounding the constant-velocity crack tip are also studied by the use of this model. This plasticity correction factor is then used to evaluateK I dyn from the dynamic isochromatics of a propagating crack in a 3.2-mm-thick polycarbonate wedge-loaded rectangular double-cantilever-beam specimen. The correctedK I dyn is in good agreement with the corresponding values computed by a dynamic, elastic-plastic finite-element code executed in its generation mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325542
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