摘要:

Abstract—The influence of cyclic loading on diffuse light transmission of GRP laminates was investigated. Light transmission decreased due to the presence of matrix microcracks and interface debonding. The dependence of defects caused by cyclic loading on the variation of light transmission was established by methods of scattering medium optics. This dependence can be applied both in investigations of the kinetics of GRP laminate failure and in the estimation of cumulative fatigue damag

ISSN:8756-758X    

DOI:10.1111/j.1460-2695.1982.tb01246.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract—The paper shows the practical significance of theoretical studies of fatigue crack propagation in real structures, and a comparison of the results of fracture mechanics theory with the actual failure mode of structures. It follows from these conclusions that neither the influence of the magnitude and complexity of structure, nor that of the random character of loading can be overlooked. Therefore, when applying laboratory test data the character of the structure under consideration and the loading conditions should be thoroughly appreciate

ISSN:8756-758X    

DOI:10.1111/j.1460-2695.1982.tb01247.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract—Electrochemical potential at the tip of a fatigue crack was measured in a compact tension specimen, situated in demineralized, oxygen saturated water at 93°C.Results show that the crack tip region is active with respect to the external specimen surface. Passivation occurs on the crack surfaces by the formation of an oxide layer. The oxygen concentration inside the crack is likely to be lower than in the bulk soluti

ISSN:8756-758X    

DOI:10.1111/j.1460-2695.1982.tb01248.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:8756-758X    

DOI:10.1111/j.1460-2695.1982.tb01249.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract—The problem associated with short crack growth, defined as situations in which the intensity of the crack tip field is underestimated by linear elastic fracture mechanics analyses, is briefly reviewed.Two cases are identified, cracks growing in plastically strained materials, such as occurs in high strain fatigue studies and at notch roots, and small cracks growing in single grains as occurs close to the fatigue limit in plain specimens.Important mechanical and metallurgical features of short cracks are discussed with particular reference to the upper and lower bound definition of a short crac

ISSN:8756-758X    

DOI:10.1111/j.1460-2695.1982.tb01250.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract—The growth of ‘small’, half‐penny shaped surface fatigue cracks in a precipitation hardened aluminum alloy is compared with the growth of ‘large’cracks in fracture mechanics type specimens. It is found that the small cracks grow much faster than LEFM equivalent large ones, and also experience growth rate perturbations. It is suggested that localized microplasticity in nominally elastic specimens is responsible for the rapid growth of small cracks and that grain size limitations on the microplastic regions cause transient decelerations and sometimes permanent arrest, in c

ISSN:8756-758X    

DOI:10.1111/j.1460-2695.1982.tb01251.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Abstract—Stress and strain distributions and crack opening displacement characteristics of short cracks have been studied in single edge notch bend and centre cracked panel specimens using elastic–plastic finite element analyses incorporating both a non strain hardening and a power law hardening behaviour.Jcontour integral solutions to describe stress strain conditions at crack tips for short cracks differ from those for long cracks. The analyses show that (i) short cracks can propagate at stress levels lower than those required for long cracks and (ii) a two‐parameter description of crack tip fields is necessary for crack propag

ISSN:8756-758X    

DOI:10.1111/j.1460-2695.1982.tb01252.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:8756-758X    

DOI:10.1111/j.1460-2695.1982.tb01253.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY