β Scribed by Majid Mirzaei; James W. Provan
No coin nor oath required. For personal study only.
This note describes the present status of a simple closure measurement technique, based upon a new analytic interpretation, and is initially applied to aluminum and titanium alloys. The proposeed procedure implements only one experimentally determined parameter for the assessment of the closure load-displacement characteristics. The procedure outlined also removes some of the current ambiguities related to the specimen dimensions and geometry.
Practical fatigue crack growth prediction models consider the stress intensity factor range AK = K -Kr~ as a field parameter that correlates crack growth rate data. Furthermore, Elber [1], discovered that fatigue cracks remain closed during a significant portion of each loading cycle. The occurrence of crack closure, which can be due to a variety of mechanisms [2,3], significantly affects the crack driving force and plays a crucial role in fatigue crack growth or arrest. The quantitative knowledge of the crack opening stress level, S , is required to define . . . . ~ .
π SIMILAR VOLUMES
The phenomenon of fatigue crack closure has attracted continued interest over recent years. This paper concerns itself with one aspect of the phenomenon namely the effects of a single asperity on the crack face close to the crack tip and under dominantly plane strain Mode 1 loading conditions. The m
The plane strain, fatigue crack problem in which fracture surface asperities prevent closure is considered. A model in which closure contact can develop on a distribution of asperities is introduced. A comparison of closure behavior for one and for two asperities is made, and the effects of variatio
A numerical analysis of plasticity-induced fatigue crack closure based upon the finite difference method is presented. This new method permits modelling easily fatigue crack growth as well as contacts between fracture faces, without requiring sophisticated algorithms. The model is applied to a wide