Numerical study of crack path by MMCG specimen using M integral
Journal Title: Frattura ed Integrità Strutturale - Year 2016, Vol 10, Issue 35
Abstract
The mixed mode loading configuration occurs in many civil engineering and mechanical applications. In wood material, the study of this problem is very important due to the orthotropic character and the heterogeneity of the material. In order to study the mixed mode loading in wood material, Moutou Pitti et al [1] have proposed a new specimen called Mixed Mode Crack Growth (MMCG). The main goal of this geometry is to propose a decrease of the energy release rate during the crack growth process. In this case, the fracture parameters can be decoupled into Mode I and Mode II in order to determine the impact of time during creep crack test. The present work proposes to study the crack path stability in MMCG specimen for different sizes and thicknesses. The Mθ integral, combining real and virtual mechanical displacement fields is used in order to separate numerically mode I and mode II in the mixed mode ratio. The stability is shown for the opening mode (Mode I), the shear mode (Mode II), and the mixed mode of 15°, 30°, 45°, 60°, 75° by computing the energy release rate versus the crack length. Finally, it is shown that the MMCG specimen can be reduced in various shape and used for example in small climate chamber in order to perform creep test at different temperature and moisture content levels.
Authors and Affiliations
S. El Kabir, R. Moutou Pitti, N. Recho, Y. Lapusta, F. Dubois
Keywords
Related Articles
- EP ID EP117648
- DOI 10.3221/IGF-ESIS.35.08
- Views 58
- Downloads 0
Impact loading of a space nuclear powerplant
Preferred formulation of the problem in two space dimensions are described for solving the three fundamental equations of mechanics (conservation of mass, conservation of momentum, and conservation of energy). Mode...
Analisi del cedimento strutturale del braccio di una gru portuale
Failure analysis of dissimilar single-lap joints
Single-lap joints made of aluminium and carbon fibre adherends of different thickness are tested to understand better the behaviour of such dissimilar joints. The overlap length and the thickness of the adhesive&n...
Crack path for run-out specimens in fatigue tests: is it belonging to high- or very-high-cycle fatigue regime?
Fatigue tests run-out specimens up to 106 – 5x107 load cycles are used to determine the stress level named “fatigue limit”. Nevertheless, it is not clear what kind of fatigue cracking takes or will take place in t...
Un approccio innovativo per l’analisi quantitativa delle superfici di frattura a fatica nelle ghise sferoidali mediante elaborazione di immagini
Le osservazioni al microscopio elettronico a scansione (SEM) delle superfici di frattura ottenute a seguito di rotture per fatica consentono di evidenziare alcuni meccanismi di avanzamento che dipendono dal materia...