Estimation of the crack propagation direction in a mixed-mode geometry via multi-parameter fracture criteria
Journal Title: Frattura ed Integrità Strutturale - Year 2015, Vol 9, Issue 33
Abstract
The presented work introduces a numerical parametric study on the crack propagation direction under mixed-mode conditions (mode I + II). It is conducted for the geometry of an eccentric asymmetric fourpoint bending of a single edge notched beam specimen; various levels of mode-mixity are ensured by modifications in the crack length and crack eccentricity. The direction of crack propagation is estimated semianalytically using both the maximum tangential stress criterion and the strain energy density criterion (implemented as a procedure within the used finite element computational code) as well as numerically (from verification reasons). Multi-parameter fracture mechanics is employed in the presented work for precise analytical evaluation of the stress field in the cracked specimen. This theory is based on description of the stress and deformation fields in the cracked body by means of their approximation using several initial terms of the Williams power series. Recent studies show that utilization of only first term of the series, which corresponds to the stress intensity factor (SIF), the single controlling parameter for the crack initiation and propagation assessment in brittle materials, is insufficient in many crack problems. It appears also in this study that the higher-order terms of the asymptotic crack-tip field are of great relevance for the conducted analysis, similarly to a number of other fracture phenomena (near-crack-tip stress field approximation, non-linear zone extent estimation, etc.)
Authors and Affiliations
L. Malíková, V. Veselý, S. Seitl
Keywords
Related Articles
- EP ID EP132566
- DOI 10.3221/IGF-ESIS.33.04
- Views 60
- Downloads 0
Misure di tenacità a frattura su acciai utilizzando velocità di deformazione elevate
La conoscenza delle proprietà meccaniche di tipo dinamico per i materiali metallici è utile ogniqualvolta la sensibilità alla velocità di deformazione è di rilevanza per un acciaio, e qualora le condizioni reali di...
Experimental investigation of hardness of FSW and TIG joints of Aluminium alloys of AA7075 and AA6061
This paper reports hardness testing conducted on welded butt joints by FSW and TIG welding process on similar and dissimilar aluminium alloys. FSW joints were produced for similar alloys of AA7075T651 and dis...
Delamination of carbon-fiber strengthening layer from concrete beam during deformation (infrared thermography)
Technology of strengthening reinforced concrete structures with composite materials has found wide application. The effectiveness of strengthening of concrete structures with externally bonded reinforcement is supp...
The research for mechanics stimulation method of nonlinearrandom vibration based on statistical linear theory
Earthquake disasters have brought great harm to people's life safety and economic property. Itseffect on fabric mainly focus on random effects currently, the general pseudo excitation method could solve theineffici...
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...