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Repeatability of experimental procedures to determine mechanical behaviour of ligaments

Öhman C., Baleani M., Viceconti M.

Acta of Bioengineering and Biomechanics

2009

Vol. 11, nr 1

19-23

The aim of this study was to investigate intra- and interspecimen repeatability of an experimental procedure, which determines elastic and viscoelastic properties of knee ligaments. The collateral ligaments from sheep were used and the repeatability was evaluated in terms of the coefficient of variation. The results indicated a good intraspecimen repeatability (the coefficient of variation generally less than 5%), whereas the interspecimen repeatability was lower (coefficient of variation of about 50%). In conclusion, since the intraspecimen coefficient of variation was low the test procedure was assumed to be repeatable.

Damage tolerance evaluation of the wing spar with cracked web

Augustin P.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

2001

nr 11

7-12

Damage tolerance evaluation is required for the aircraft life determination according to FAR Part 25 regulations. This concept is based on the crack propagation and residual strength determination. The damage tolerance evaluation of an aircraft structure, results in the inspection program ensuring that fatigue initiated cracks would involve no failure prior to the detection. The inspection program must be developed for each main structural element in the aircraft. Solutions to this problem usually found in the literature deal mainly with the components subject to tension; such as stiffened panels or lugs. This paper presents the testing program and FEM analysis focused on the wing spar with cracks in the web. It is characteristic of fatigue cracks in the web that they usually change their growth direction due to a complex stress state. The crack shape measured was used for constructing of a FEM model of the spar, the residual strength was calculated and compared with the experimental results.