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  • 1
    Electronic Resource
    Electronic Resource
    The influence of yield strength and negative stress ratio on fatigue crack growth delay in 4140 steel (1977)
    Springer
    International journal of fracture 13 (1977), S. 455-466 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Single tensile overloads were applied to AISI 4140 compact steel specimens with three yield strengths of 110, 165 and 205 ksi and three stress ratios R of 0, −1/2, and −1. Fatigue crack growth delay was significantly longer for the low yield strength steel with R=0. However, at R=−1 only slight differences in delay occurred for all three yield strengths. Thus delay from single tensile overloads with R≥0 can be quite misleading when compared with negative stress ratio delay results. This implies that small compressive cyclic stresses, which often have only a small influence on constant amplitude crack growth behavior, may have significant influence in spectrum loading due to reduction of delay from high tensile overloads. This reduction in delay may be attributed to cyclic relaxation of both crack region residual stresses and crack closure. Under constant amplitude testing, fatigue crack growth rates were more dependent upon yield strength than upon R ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034247
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Alkyl cyanoacrylates as space filling bone adhesives (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 3 (1992), S. 207-210 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Higher chained alkyl cyanoacrylates have potential to function efficiently as space filling, hydrophobic, viscoelastic, biocompatible, and rapidly polymerizing bone adhesives. Hence they may be useful in applications where a void has to be filled, such as replacement of the intervertebral disc. To assess their applicability as space filling material in such an pplication, three alkyl cyanoacrylates; methoxyethyl cyanoacrylate, isobutyl cyanoacrylate, and isoamyl cyanoacrylate have been evaluated in this study. The bonding strength of these cyanoacrylates to bone in a space filling situation have been measured. The results indicate the bond strength of isoamyl cyanoacrylate (0.13 MPa) to be significantly (p 〈 0.05) lower compared with methoxyethyl cyanoacrylate (0.33 MPa) and isobutyl cyanoacrylate (0.37 MPa). There was no significant difference in the bond strengths of isobutyl cyanoacrylate and methoxyethyl cyanoacrylate.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770030307
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Bone-particle-impregnated bone cement: An in vitro study (1987)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 21 (1987), S. 247-261 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Bone-particle-impregnated bone cement specimens (up to 30% by weight) were characterized by various test methods. The experimental bone cement showed decreased crack propagation rates and increased Young's modulus, while the ultimate tensile strength and impact strength were decreased. The viscosity could be adjusted by adding initiators lost when substituting the PMMA powder with bone particles. The present study warranted fur-ther in vivo experiments on the possibility of tissue ingrowth for which the new bone cement was developed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820210208
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    Paper (German National Licenses)
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