Crack-growth-rate estimation on a three-point bend specimen during low-cycle fatigue
- 60 Downloads
The ratio of the change of the clip-gage measured crack-opening displacement of a three-point bend specimen to the change of the displacement at the point of application of the cyclic load is shown to vary linearly with the ratio of the crack length to the specimen height. With the aid of this relation, the crack-growth rate is obtained by numerical differentiation of the crack length with respect to the number of load cycles. A clip-gage correction factor is introduced in order to compensate for the use of external edges to position the clip-gage during the experiment.
KeywordsFatigue Mechanical Engineer Fluid Dynamics Correction Factor Crack Length
Unable to display preview. Download preview PDF.
- 1.Broberg, K. B., “The Foundation of Fracture Mechanics,”Eng. Fract. Mech.,16 (4),497–515 (1982).Google Scholar
- 2.Broberg, K.B., “On Stable Crack Growth,”J. Mech. Phys. Solids,23,215–237 (1975).Google Scholar
- 3.Veerman, C.C. andMuller, T., “The Location of the Apparent Rotation Axis in Notched Bend Testing,”Eng. Fract. Mech.,4,25–32 (1972).Google Scholar
- 4.Green, A.P. andHundy, B.B., “Initial Plastic Yielding in Notch Bend Test,”J. Mech. Phys. Solids,4,128–144 (1956).Google Scholar
- 5.Gurson, A.L., “Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I — Yield Criteria and Flow Rules for Porous Ductile Media,”J. Eng. Mat. Tech.,99,2 (1977).Google Scholar
- 6.Tvergaard, V. andNeedleman, A., “Analysis of the Cup-cone Fracture in a Round Tensile Bar,”Acta Met.,32 (1),157–169 (1984).Google Scholar
- 7.Ristinmaa, M., unpublished work (1989).Google Scholar
- 8.Tvergaard, V., “Influence of Voids on Shear Band Instabilities Under Plane Strain Conditions,”Int. J. Fract.,17 (4),389–407 (1981).Google Scholar
- 9.Tada, H., Paris, P. andIrwin, G. “The Stress Analysis of Cracks Handbook,”Del Research Corp., Hellertown, PA (1973).Google Scholar