Engineering and Computer Science Faculty Publications

The Effect of Groove in Bone Fracture Toughness Testing

Document Type

Article

Publication Date

12-1992

Journal Title

Journal of Biomechanics

Volume

25

Issue

12

First Page

1489

Last Page

1492

DOI

10.1016/0021-9290(92)90061-5

Abstract

When testing for the effects of bone orientation on mode I fracture toughness, compact tension specimens are grooved with a V-notch to provide a crack guide. The effect of grooving on the expressions for the critical stress intensity factor (Kc) and the critical strain energy release rate (Gc) for mode I fracture toughness was investigated. Experiments were performed using grooved and ungrooved bovine compact tension specimens. The results indicate that the standard expression used to determine Kc for a compact tension specimen requires modification. The thickness (B) must be modified to account for the thickness between the grooves (Bn). The thickness used in the standard expression is replaced by an effective thickness written as (BBn)0.5. It was also found that the thickness between the grooves should be used in the standard formula for Gc.

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