By J. Singer
* Edited by way of Josef Singer, the world's optimal authority on structural buckling.* Time-saving and low cost layout information for all structural, mechanical, and aerospace engineering researchers.
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Extra resources for Buckling Experiments, Shells, Built-up Structures, Composites and Additional Topics (Volume 2)
Here they considered a crack to have a series of dislocations ahead of the crack tip, which they termed a super dislocation, and that crack growth occurred as a result of the formation of micro-cracks ahead of the crack tip. These assumptions led to a crack growth equation of the form: da/dN = F 'V(1/O-1) ('K -'Kth)2/(K2Ic-'K2) (3) where F, and O are material constants and KIc is the plane strain Mode I fracture toughness. It should be noted that for small cracks 'K is proportional to 'V Sa so that when 'K << KIc , and O = 1/(J -1) then equations (2) and (3) have a similar form.
4% of the original spectrum. The Rot 20 and 24 spectra were very similar and only the Rot 16, Rot 20 and the Rot 32 spectra were analysed. The relationship between the maximum stress intensity factor in the block Kmax and the crack length is given in Figure 7. Fig. 6 Crack growth rate for the Rotarix 20 spectra, adapted from . The resultant experimental and the computed crack length histories, obtained using Equation (15) with the value of J fixed at three and the values ~ of C and Kc as given in Table 1, are shown in Figure 8 where we again see good agreement between the computed and the measured crack length history.
Piascik, J. C. Newman, and N. E. : American Society for Testing and Materials, (1997) 287-300. , Barter S. , Evaluation of spectrum fatigue crack growth using variable amplitude data. International Journal of Fatigue, in press. , Barter S. , Observations of crack path changes under simple variable amplitude loading in AA7050-T7451, Int. Journal of Fatigue, (In press). , Fatigue crack growth rates under variable amplitude load spectra containing tensile underloads, PhD Thesis, Cranfield, 2004. , Gust severity effects on fatigue crack propagation in aluminium alloy sheet materials, International Journal of Fatigue, 1(3) (1979) 118123.
Buckling Experiments, Shells, Built-up Structures, Composites and Additional Topics (Volume 2) by J. Singer