مؤتمر
On bifurcation in local and nonlocal materials with tension and compression damage
| العنوان: | On bifurcation in local and nonlocal materials with tension and compression damage |
|---|---|
| المؤلفون: | Rizzi, Egidio |
| المساهمون: | Comi, Claudia, Rizzi, Egidio |
| بيانات النشر: | ECCOMAS (European Community on Computational Methods in Applied Sciences) ES Barcelona |
| سنة النشر: | 2000 |
| المجموعة: | Aisberg - Archivio istituzionale dell'Università di Bergamo |
| مصطلحات موضوعية: | Gradient-dependent damage, Initial-boundary value problem, Isotropic damage model, Non-local damage model, Nonlocal, Strain localization, Tension and compression, Tension/compression, Computational method, Concrete, Continuum damage mechanic, Initial value problem, Wave propagation, Bifurcation (mathematics), Nonlocal integral damage, Settore ICAR/08 - Scienza delle Costruzioni |
| الوصف: | In the present work an isotropic damage model for concrete accounting separately for progressive degradation of the elastic properties under prevailing tension and compression stress states is considered in both local and nonlocal forms. The possible occurrence of material instabilities in the form of strain localization is analyzed. For the local model, the bifurcation conditions at the onset of strain localization are first solved in terms of the critical values of the damage variables. Next, in order to avoid ill-posedness of the initial-boundary value problem, two nonlocal enhancements are provided through integral averaging or gradient dependency. The regularizing properties of both nonlocal formulations are explored. The expressions of the characteristic lengths implicitly introduced by the nonlocal enhancements are derived through a one-dimensional wave propagation analysis. Such results are confirmed by preliminary numerical FE simulations of the quasi-static response of a tensile bar analyzed with the nonlocal damage model. |
| نوع الوثيقة: | conference object |
| وصف الملف: | remote; optical disk |
| اللغة: | English |
| العلاقة: | info:eu-repo/semantics/altIdentifier/isbn/9788489925700; ispartofbook:European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2000; ECCOMAS 2000: European Congress on Computational Methods in Applied Sciences and Engineering, 11-14 September 2000, Barcelona, Spain; firstpage:1; lastpage:20; http://hdl.handle.net/10446/65837Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84893422844 |
| الإتاحة: | http://hdl.handle.net/10446/65837Test |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.D4BA7621 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |