Size effect on fracture energy induced by non-locality

被引：67

作者：

Jirásek, M ^{[1
]}

Rolshoven, S ^{[1
]}

Grassl, P ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Lab Struct & Continuum Mech, CH-1015 Lausanne, Switzerland

来源：

INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS | 2004年 / 28卷 / 7-8期

关键词：

quasibrittle materials; scaling; compact tension test; fracture energy; non-local damage; parameter identification;

D O I：

10.1002/nag.364

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Experimental results available in the literature indicate that the nominal fracture energy of concrete (defined as total work of fracture divided by the ligament area) depends on the size of the specimen. Theoretical modelling of the size effect on nominal fracture energy based on a non-local constitutive model is attempted in this paper. The influence of various details of the integral-type non-local formulation, e.g. of the specific form of non-local averaging in the vicinity of a physical boundary, is studied and a physical explanation is provided. The numerical results are compared to experimental data for notched compact tension specimens, and conclusions are drawn for individual formulations. It is shown that the best agreement with experimentally observed trends is achieved if the notch is modelled as a layer of completely damaged material. Fitting of the size effects on both strength and fracture energy permits a unique identification of the model parameters. Copyright (C) 2004 John Wiley Sons, Ltd.

引用

页码：653 / 670

页数：18

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