IFMASS8

320

this is not so much at the highest level because critical crack sizes are very sensitive with

respect to the input information. At the highest level, the conservatism was mostly due to

the simplified crack model used as substitute geometry (Fig. 11).

It can be concluded that failure occurred as the consequence of inadequate design and

not of inadmissible handling, such as overloading. The failure could have been avoided

by applying fracture mechanics in the design stage. The SINTAP algorithm was shown to

be an easy, but suitable tool for this purpose.

CONCLUSIONS

The basic principle of the recently developed European SINTAP procedure has been

reviewed. The SINTAP procedure contributes towards the development of a fitness for

service standard of the European Committee for Standardization (CEN). The SINTAP

procedure was applied to

or predicting

the critical size

. Assuming the

loa

in service. The results

reases by increasing the quality of input data.

The Stress Analysis of Cracks Handbook

. ASME Press,

mechanical heterogeneity

gineering approach for elastic-plastic fracture

rt NP-1931, EPRI, Palo Alto, CA. (1981)

the failure analysis of a cracked component, and f

of cracks on both sides of a bore hole in a fork of a forklift

ding by design, an overall critical crack size of 35.6 mm (including both cracks and the

hole) was predicted at the highest analysis level, whereas the real fork had fractured in

service after the overall crack size reached a length of 45.5 mm. This result has shown

that inadequate design could give a sufficient account to failure without any need to

imply further reasons such as inadmissible handling of the forklift

procedure gives reliable conservative results

of the example also showed that SINTAP

where conservatism (e.g. safety factor) d

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Murakami, Y., et al. (Eds.),

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(strength mismatch)

, GKSS Report 97/E/9. (1997)

Schwalbe, K-H., Zerbst, U, Kim, Y-J., Brocks, W., Cornec A., Heerens J., Amstutz H.,

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Kumar, V., German, M.D., Shih, C.F.,

An en

analysis

, EPRI-Repo

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2000

Ainsworth, R.A., Bannister, A.C., Zerbst, U.,

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