Numerical study of a bedding effect in bulk solids in silos

Tejchman, A.

Artykuł - szczegóły

Tytuł artykułu

Numerical study of a bedding effect in bulk solids in silos

Autorzy

Tejchman A.

Wybrane pełne teksty z tego czasopisma

Identyfikatory

Warianty tytułu

Numeryczne studia nad efektem podatności w materiałach sypkich w silosach

Języki publikacji

Abstrakty

Paper is concerned with a bedding effect in granular bulk solids in silos. FE-analyses were performed for a steel cylindrical thin-walled model silo with imperfections containing dry sand. Numerical calculations were carried out with a polar hypoplastic constitutive relation which can capture the salient properties of granular materials during shear localisation. During FE-calculations, different types of wall displacements along the silo height were taken into account to model roughly the formation of buckles due to the loss of stability. The effect of the initial void ratio, mean grain diameter, wall roughness, and size, location and form of buckles was studied. Numerical results evidently show that the modelling of a bedding effect of bulk solids by means of springs is too simple and can lead to unrealistic predictions of the bedding modulus.

Artykuł zajmuje się efektem podatności w ziarnistych materiałach sypkich w silosach. Przeprowadzono analizę metodą elementów skończonych dla stalowego cylindrycznego cienkościennego silosu z imperfekcjami, zawierającego suchy piasek. Obliczenia numeryczne wykonano stosując mikropolarne hipoplastyczne prawo konstytutywne zdolne opisać najważniejsze właściwości materiałów ziarnistych podczas lokalizacji odkształceń statycznych. Podczas obliczeń numerycznych uwzględniono różne przemieszczenia ściany wzdłuż wysokości silosu symulujące w przybliżeniu powstanie wybrzuszeń wyboczeniowych wskutek utraty stateczności. Zbadano wpływ początkowego wskaźnika porowatości, średniej średnicy ziarna, szorstkości ściany, wymiaru, pozycji i kształtu wybrzuszeń. Numeryczne wyniki pokazują wyraźnie, że modelowanie efektu podatności w materiałach sypkich za pomocą sprężyn jest zbyt proste i może prowadzić do nieprawdziwych oszacowań modułu podatności.

Słowa kluczowe

materiał sypki silos podatność moduł podatności

Wydawca

Komitet Inżynierii Lądowej i Wodnej PAN
Politechnika Warszawska, Wydział Inżynierii Lądowej

Czasopismo

Archives of Civil Engineering

Rocznik

2000

Tom

Vol. 46, nr 3

Strony

427--450

Opis fizyczny

Bibliogr. 56 poz., il.

Twórcy

autor

Tejchman A.

Technical University of Gdańsk, Faculty of Civil Engineering Institute of Concrete Structures

Bibliografia

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Bibliografia

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