From previous investigations of the mechanisms of both fracture and fatigue crack propagation, the static fracture model proposed by Lal and Weiss may be thought as reasonable for describing fatigue crack propagation in metals at both low and interm~iate stress intensity factor ranges AK. Recent pro
Fatigue crack propagation in an epoxy polymer
โ Scribed by Stephen A. Sutton
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 767 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0013-7944
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โฆ Synopsis
This experimental study investigates the fatigue crack growth rate behavior in an epoxy resin polymer usb the tapered-double-cantilever-beam (TDCB) specimen in ambient and elevated temperature environments. An empirical crack growth rate model based on the change in crack extension force, 69, is proposed. Its relation to current AK models is discussed and observations on the fatigue surfaw morphology presented.
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The transient fatigue crack prorate resufting from the sudden change of the stress intensity factor amplitude or from the change of the stress cycle asymmetry or from the application of the single overload cycle was measured on carbon steel specimens. To simplify the con~tions and to increase the sc
The structure is discretixed and represented by a system of linear differential equations. Cracks are modelled as local flexibilities. Application on a 4-node rotor with a circumferential crack illustrates the dynamic crack arrest. The depth of the crack determines the local stiffness introduced by
Ah&act-Fatigue crack growth data in the region of stage II(a) and stage II(b) have been attempted. It has been observed that the stage II(a) and the stage II(b) crack growth rate vs AK relations have their own pivot points. The dependence of the threshold stress intensity factor on the stress ratio