Results 261 to 270 of about 58,593 (304)

Synergetic Effects of Fatigue Crack Closure Mechanisms

1999
Results are presented relating to the relative effect of two closure mechanisms. Two different crack closure mechanisms, closure due to surface roughness induced by shear lips and conventional plasticity-induced closure, are investigated and compared by performing fatigue crack growth tests on aluminum 2024 and technically pure aluminum.
J Zuidema, TM van Soest, M Janssen
openaire   +1 more source

Effect of Crack Closure on Magnitude of Modulated Wave

International Journal of Structural Stability and Dynamics, 2020
Fatigue cracks generated by repeated loads cause structural failures. Such cracks grow continuously and at an increasing speed owing to the concentration of stresses near the crack tips. Therefore, the early detection of fatigue cracks is imperative in the field of structural-health monitoring for the safety of structures exposed to dynamic loading ...
Sang Eon Lee, Jung-Wuk Hong
openaire   +1 more source

A cumulative model of fatigue crack growth and the crack closure effect

International Journal of Fatigue, 1984
Abstract A model of fatigue crack growth based on an analysis of elastic/plastic stress and strain at the crack tip is presented. It is shown that the fatigue crack growth rate can be calculated using the local stress/strain at the crack tip by assuming that a small highly strained area x ∗ , existing at the crack tip, is responsible for ...
G. Glinka, C. Robin, G. Pluvinage, C. Chehimi   +3 more
openaire   +1 more source

Microstructural effects on crack closure and propagation thresholds of small fatigue cracks

Fatigue & Fracture of Engineering Materials & Structures, 2001
The crack closure behaviour of microstructurally small fatigue cracks was numerically simulated by combining the crack‐tip slip band model with the plasticity‐induced crack closure model. A Stage II crack started to propagate from an initiated Stage I crack.
Y. Akiniwa, K. Tanaka, H. Kimura
openaire   +1 more source

A model for characterizing crack closure effect of rocks

Engineering Geology, 2015
Abstract When there are large amounts of microcracks in the rock, they influence the rock strength and deformation significantly. The crack closure behavior in compression tests and its quantitative characterization are studied in this paper.
Jun Peng, Guan Rong, Ming Cai, Chuang-Bing Zhou   +3 more
openaire   +1 more source

Effect of periodic bands of overloads on crack closure

International Journal of Pressure Vessels and Piping, 1989
Abstract Crack closure experiments were performed on 6061-T6 Al-alloy for various bands of overloads. These bands of overloads were applied after an interval of 10% CAL life from the beginning and after exhausting 50% CAL life. The sequence is almost constant amplitude loading with periodically inserted multiple overloads, which subsequently cause ...
Raghuvir Kumar, S.B.L. Garg
openaire   +1 more source

Crack Closure and Overload Effects in Fatigue

1983
Observations of crack closure occurring during crack propagation in thin sheet materials under variable amplitude cyclic loading are discussed. The studies show that closure in the region immediately adjacent to the crack tip is important in controlling crack growth. From this basis, the Dugdale model and a simple fracture mechanics analysis is used to
openaire   +1 more source

Analysis of effects of crack closure in shells

Engineering Fracture Mechanics, 1989
Abstract The effect of crack closure in a shell was studied using the finite element method. Elastic open cylindrical shells, containing through-wall-thickness stationary cracks under bending loads, were considered. Crack closure was modeled using the line closure model.
openaire   +1 more source

Crack closure and the environmental effect on fatigue crack growth

1976
Aerospace ...
Schijve, J. (author), Arkema, W.J. (author)   +1 more
openaire   +1 more source

Effect of Crack Closure on Quantitative ECT Inspection of Closed Fatigue Cracks

2008
In this paper, the feasibility to apply a closed fatigue crack as a substitute of a Stress Corrosion Crack (SCC) is investigated aiming at applications to ECT crack sizing. Several testpieces of closed fatigue cracks are fabricated, and ECT signals are measured after selected bending loads being applied to close the crack.
Chen Zhenmao, Yusa Noritaka, Miya Kenzo, Tokuma Hideaki   +3 more
openaire   +1 more source