کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
279093 | 1430331 | 2009 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Monte Carlo simulation of complex cohesive fracture in random heterogeneous quasi-brittle materials Monte Carlo simulation of complex cohesive fracture in random heterogeneous quasi-brittle materials](/preview/png/279093.png)
A numerical method is developed to simulate complex two-dimensional crack propagation in quasi-brittle materials considering random heterogeneous fracture properties. Potential cracks are represented by pre-inserted cohesive elements with tension and shear softening constitutive laws modelled by spatially-varying Weibull random fields. Monte Carlo simulations of a concrete specimen under uni-axial tension were carried out with extensive investigation of the effects of important numerical algorithms and material properties on numerical efficiency and stability, crack propagation processes and load-carrying capacities. It was found that the homogeneous model led to incorrect crack patterns and load–displacement curves with strong mesh-dependence, whereas the heterogeneous model predicted realistic, complicated fracture processes and load-carrying capacity of little mesh-dependence. Increasing the variance of the tensile strength random fields with increased heterogeneity led to reduction in the mean peak load and increase in the standard deviation. The developed method provides a simple but effective tool for assessment of structural reliability and calculation of characteristic material strength for structural design.
Journal: International Journal of Solids and Structures - Volume 46, Issue 17, 15 August 2009, Pages 3222–3234