Computational post failure analysis with Cosserat continuum

被引：0
|
作者：
Papanastasiou, Panos [1 ]
机构：
[1] Univ Cyprus, Dept Civil & Environm Engn, CY-1678 Nicosia, Cyprus
来源：
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING | 2010年 / 14卷 / 8-9期
关键词：
Cosserat model; plasticity theory; finite elements; stability; bifurcation; localization of deformation; scale effect; borehole; perforations; GRADIENT ELASTOPLASTICITY; BIFURCATION-ANALYSIS; DEEP BOREHOLES; SHEAR BANDS; LOCALIZATION; DEFORMATION;
D O I：
10.3166/EJECE.14.1051-1065
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
We present computational analysis of geomechanics problems in the post failure regime based on a Cosserat material modelThe introduction of internal length (related to grain size) in the Cosserat model improves the computational stability and allows for robust progressive localization modelling. The model is capable of predicting advanced deformation modes such as surface buckling and localization of deformation in shear bands that may cause failure in a structure. The obtained results show clearly a progressive failure mechanism and the computed modes are in a good qualitative agreement with laboratory and field observations. As illustration we present results of two applications from petroleum engineering: the modelling of failure in thick walled cylinder test and the stability of elliptical shape perforations.
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页码：1051 / 1065
页数：15
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