Measurement and simulation of strain fields around crack tips under mixed-mode fatigue loading
Journal Title: Frattura ed Integrità Strutturale - Year 2015, Vol 9, Issue 33
Abstract
For various configurations examined in a series of fatigue experiments on thin-walled tubes under tension and torsion, the experimental results – crack path, crack growth life, near crack tip deformations, and crack closure – are measured and compared to the results of some numerical simulations. Partially automated optical inspection and the digital image correlation technique were used in the experimental investigation. In the finite element analyses, an actual geometry of a cracked structure has been modeled. The mechanical material behavior has been assumed as linear elastic in a first approach for calculating stress intensity factors. The nonlinear nature of the cyclic deformation has been taken into account by applying a cyclic plasticity model, and plasticity-induced crack closure is captured by a contact formulation.
Authors and Affiliations
Y. Hos, M. Vormwald, J. Freire
Keywords
Related Articles
- EP ID EP148207
- DOI 10.3221/IGF-ESIS.33.06
- Views 70
- Downloads 0
Numerical analysis of hydrogen-assisted rolling-contact fatigue of wind turbine bearings
Offshore wind parks at locations further from the shore often involve serious difficulties, e.g. the maintenance. The bearings of offshore wind turbines are prone to suffer hydrogen-assisted rolling-contact fatig...
Role of multiaxial stress state in the hydrogen-assisted rolling-contact fatigue in bearings for wind turbines
Offshore wind turbines often involve important engineering challenges such as the improvement of hydrogen embrittlement resistance of the turbine bearings. These elements frequently suffer the so-called phenomenon...
Strength evaluation of structural hybrid bonded joints
The idea of “hybrid joints” arises from the need of joining together materials, producing a tough, stiff and lightweight joint. The core concept is: use two different joining techniques, with the aim to increase the stre...
Experimental methods for the characterization of fatigue in microstructures
The mechanical fatigue behavior of gold microbeams is analyzed. Dedicated devices have been designed and built able to produce alternate loading on gold specimens; the electrostatic actuation is used as driving for...
The non-proportionality of local stress paths in engineering applications
A scalar measure, which describes the non-proportionality of local stress paths in engineering applications, is introduced. For this purpose the moment of inertia approach by Meggiolaro is modified in a way th...