Crack growth stability analysis with respect to boundary disturbance
Fracture analysis is a high non-linear problem and affected by uncertainties. Because of the limitation of observing technology, accuracy boundary condition can hardly be obtained. Normally, a stochastic model can be used. The difference between reality and numerical model is deemed as disturbance. This paper presents a three-dimension dynamic stability analysis of crack growth under disturbance in boundary condition by using particle discretization scheme finite element method. The model is a thin epoxy plate with two anti-symmetric notches located in the middle, under uni-axial tensile in longitudinal direction. Two types of disturbance are considered: (i), the disturbance is added to the initial cracks configuration. The disturbance is modeled by adjusting the position, size and shape of the notches. It shows that changes of the notches size and position have significant influence on crack growth in the investigated cases; (ii), the disturbance is applied to the displacement boundary condition, which is far from initial cracks. The variability of crack paths of different model sizes under the same disturbance is estimated. The results of the numerical experiment indicate that as the model size increases, the influence of the disturbance becomes weaker. The Saint-Venant principle still holds in the studied crack growth problem.
Three dimensional dynamic crack growth particle discretization scheme finite element method boundary disturbance stability analysis
Hao Chen
Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,CEA,Sanhe,065201,China
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）