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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of adhesion of thin polymer coatings by indentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3626-3634 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A microindentation technique was developed to measure the adhesive shear strength of thin polymer coatings on glass substrates. Indentation-induced debonding of the coating was observed to occur under three different conditions: Type I was with the deformations underneath the indenter being essentially elastic; Type II was with the deformations underneath the indenter being plastic; and Type III was after the indenter penetrated the substrate. Stress analyses to calculate the interfacial shear stress for the indentation-induced debonding of thin coatings are presented for the three types of debonding. All three stress analyses are based upon the linear, elastic analysis of the contact stresses arising from indentation of a soft coating on a rigid substrate. These analyses provide a basis for using controlled indentation debonding as a quantitative measure of the interfacial shear strength of thin coatings to rigid substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344071
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  • 2
    Electronic Resource
    Electronic Resource
    Use of the microindentation technique for determining interfacial fracture energy (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3291-3296 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microindentation technique was used to determine the interfacial fracture energy of epoxy coatings on soda-lime glass substrates. An analytical model was developed for calculating fracture energy based on indenter load versus debond crack size measurements. Finite-element analysis was used to determine the relative amounts of opening and shear loadings at the debond crack tip. The calculated fracture energies are compared to values determined by the double-cantilever-beam technique and the four-point flexure-beam technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345363
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  • 3
    Electronic Resource
    Electronic Resource
    Influence ofR-curve behaviour on strength degradation due to Hertzian indentation (1996)
    Springer
    Journal of materials science 31 (1996), S. 2379-2384 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence ofR-curve behaviour on the post-indentation strength of two types of alumina was studied using Hertzian indentation. Soda-lime glass was included in the study to represent a material which does not exhibitR-curve behaviour. Specimens were indented with a spherical indentor with increasing loads. Post-indentation strength was measured in a mineral-oil environment using a ring-on-ring biaxial fixture. Indentation of the two aluminas produced the typical Hertzian crack pattern with a somewhat greater statistical variability than that found in soda-lime glass. The strength of the two aluminas fell into four different regimes that were separated by the onset of ring, cone, and radial crack formation, respectively.R-curve behaviour did not appreciably influence the results, undoubtedly due to the relatively narrow range of indentation loads where failure was controlled by ring and cone cracks. These strength results contrast to those obtained for soda-lime glass. In soda-lime glass, ring and cone crack nucleation occurred simultaneously with a sudden drop in strength followed by a gradual decline in strength with increasing indentation load, in accordance with the prediction of Hertzian cone-crack theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01152950
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  • 4
    Electronic Resource
    Electronic Resource
    Moisture-assisted crack growth at epoxy–glass interfaces (1998)
    Springer
    Journal of materials science 33 (1998), S. 4581-4588 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The double cleavage drilled compression (DCDC) test was used to measure the critical energy release rate, moisture-assisted crack growth, and fatigue threshold for epoxy–glass interfaces bonded with and without a silane coupling agent. The DCDC specimen consists of two glass beams (either soda-lime or fused silica) bonded together with an epoxy adhesive. A through-the-thickness hole is drilled in the centre of the specimen. In the DCDC test compressive loading causes tensile stresses to develop at the poles of the drilled hole. Cracks then nucleate in the epoxy–glass interface, extend from the poles, and propagate axially along the interface in primarily mode I loading. The resistance to moisture-assisted crack growth at untreated epoxy–glass interfaces is significantly less than that in monolithic glass specimens. However, the resistance to moisture-assisted crack growth at silane bonded epoxy–glass interfaces can be comparable with or greater than that in monolithic glass. Silane bonding of epoxy to glass is more effective with fused silica than soda-lime glass, with the fatigue limit of silane bonded epoxy–fused silica interfaces being about 2.5 times greater than that for silane bonded epoxy–soda-lime glass. These results are discussed in terms of possible interfacial crack growth mechanisms. © 1998 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004477006957
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of fatigue data for lifetime predictions for ceramic materials (1978)
    Springer
    Journal of materials science 13 (1978), S. 2071-2080 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Accuracy in data analysis is of utmost importance because lifetime predictions are extremely sensitive to experimental uncertainty in the crack growth parameters. The limitations of the conventional data reduction techniques used for analysing static and dynamic fatigue data are reviewed and new, statistical methods of data reduction that offer advantages over the conventional techniques are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541660
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  • 6
    Electronic Resource
    Electronic Resource
    Static and dynamic fatigue of polycrystalline alumina (1979)
    Springer
    Journal of materials science 14 (1979), S. 626-632 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The fatigue failure of polycrystalline alumina was measured in a moist air environment at 30° C as a function of constant applied tensile stress and stressing rate. The good correlation found between the fatigue test data and fracture mechanics theory indicates that fatigue is controlled by the slow crack growth of pre-existing flaws and that static and dynamic fatigue test techniques adequately define the fatigue parameters needed for failure predictions. Comparisons of proof-test predictions with experiment indicate that the proof test can be effective in eliminating weak samples from the population and in assuring against the delayed failure of polycrystalline alumina in a moist environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00772723
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  • 7
    Electronic Resource
    Electronic Resource
    Failure of amorphous polystyrene (1979)
    Springer
    Journal of materials science 14 (1979), S. 2446-2452 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The failure behaviour of amorphous polystyrene was studied in methanol and ambient air under constant load and strain rate conditions. The good correlation found between fracture mechanics theory and the test results of both crazing and fracture indicates that fracture mechanics theory can be used in predicting failure of amorphous polystyrene. From the fracture mechanics analysis of the results it is inferred that the kinetics associated with craze initiation and crack propagation are similar and that the inherent flaw responsible for failure first initiates the craze in which a crack is then formed. Both the distribution of inherent flaws and the kinetics of crazing and fracture are dependent on the test environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00737035
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  • 8
    Electronic Resource
    Electronic Resource
    Fundamental approach to failure statistics of optical glass fibres (1981)
    Springer
    Journal of materials science 16 (1981), S. 1909-1912 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Tensile strength data of fused silica optical fibres was analysed without making any a priori assumptions regarding the flaw density distribution. Based on the strength data of short length specimens (0.05 to 0.6 m), predictions of the strengths of long length specimens (500 to 1100 m) were in good agreement with actual data. The advantages of a fundamental approach to the statistical analysis of failure of optical glass fibres compared with the more widely used Weibull statistics are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540639
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  • 9
    Electronic Resource
    Electronic Resource
    Strength of poly(methyl methacrylate) with indentation flaws (1988)
    Springer
    Journal of materials science 23 (1988), S. 2370-2378 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Controlled flaws were introduced into poly(methyl methacrylate) samples in the presence of liquid acetone using a Vickers indenter over a range of indentation loads from 100 to 1400 N. Due to the large plastic zone underneath the indenter, the radial crack formed by indentation consisted of two halves, known as Palmqvist cracks, instead of a single semicircular crack. The strengths of the samples were measured in air either immediately following indentation or after a stress-relief anneal. The strength of the as-indented samples was about 6% less than that of the annealed samples; however, the dependence of strength on indentation load was similar for both sets of samples. These results were interpreted in terms of an indentation fracture mechanics model. The analysis is consistent with poly(methyl methacrylate) having a rising fracture toughness with increasing crack size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111890
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of microstructure on the erosion and impact damage of sintered silicon nitride (1991)
    Springer
    Journal of materials science 26 (1991), S. 5543-5546 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The erosion rates and impact damage of two sintered silicon nitride materials with identical compositions but different microstructures were determined as a function of impacting particle (SiC) kinetic energy and temperature (25–1000° C) using a slinger-type erosion apparatus. The coarse-grained silicon nitride had significantly better resistance to impact damage than the fine-grained material. Crack-microstructure interactions were characterized using scanning electron microscopy and showed that crack-bridging was an important toughening mechanism in the coarse-grained material. Post-impact strength data were significantly less than those predicted from the indentation-strength data, due to impact flaws linking up prior to fracture. Consistent with its greater fracture resistance, the erosion rate of the coarse-grained material was less than that of the fine-grained material for erosion at 25 deg, and was independent of erosion temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403956
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