Metafor

ULiege - Aerospace & Mechanical Engineering

User Tools

Site Tools

You are here: metafor.ltas.ulg.ac.be » doc » Documentation » elements » General Points » Failure criteria
Trace: • Failure criteria • Versions des libs/progs installés sur les machines du service • Nonlinear normal modes • Marco Lucio CERQUAGLIA • 2D Taylor-Couette flow
doc:user:elements:volumes:rupturecritere

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
doc:user:elements:volumes:rupturecritere [2016/10/09 01:08] – [LouRuptureCriterion] canalesdoc:user:elements:volumes:rupturecritere [2022/07/14 14:32] (current) – papeleux
Line 1: Line 1:
  
-====== Failure criterion ======+====== Failure criteria ======
  
 ===== RuptureCriterion ===== ===== RuptureCriterion =====
Line 6: Line 6:
 === Description === === Description ===
  
-''RuptureCriterion'' manages various failure criteria. Two parameters are common in all laws. First, the critical value //C// of a variable above which the element is broken. Second, the type of failure : the element is broken if the criterion is verified on one integration point (''ONEBROKEN''), on all of them (''ALLBROKEN''), or in average (''MEANBROKEN'') over the element.+''RuptureCriterion'' manages various failure criteria.  
 + 
 +The critical value //C// (''RUPT_CRIT_VALUE'') of a variable above which the element is broken.  
 + 
 +The type of failure (''RUPT_TYPE_CRIT'') are defined in the table below :  
 + 
 + 
 +^          Name      ^ Description       ^  
 +| ''NOBREAK''      |  Compute the criterion, but never break any element  | 
 +| ''ONEBROKEN''    |  Break an element when ONE integration point override the critical value  | 
 +| ''ALLBROKEN''    |  Break an element when ALL the integration points override the critical value  | 
 +| ''MEANBROKEN''   |  Break an element when the averaged value over the integration points override the critical value  | 
  
 === Parameters ===  === Parameters === 
Line 31: Line 43:
 Four simple rupture criteria are gathered in one single family. In order to selected one of the criteria the parameter ''RUPT_OP_LAW'' (only parameter in this criterion) need to be defined as: ''COCKROFT'', ''BROZZO'', ''AYADA'' or ''RICE''. Then, the element is broken if the variable C reaches a critical value, which is defined in each case as: Four simple rupture criteria are gathered in one single family. In order to selected one of the criteria the parameter ''RUPT_OP_LAW'' (only parameter in this criterion) need to be defined as: ''COCKROFT'', ''BROZZO'', ''AYADA'' or ''RICE''. Then, the element is broken if the variable C reaches a critical value, which is defined in each case as:
  
-//Cockroft and Latham criterion //+//Cockroft and Latham criterion (dimensional Value) : ''COCKROFT2''// 
 +$$ C = \int_0^{\overline{\varepsilon}^p} \sigma_1  d\overline{\varepsilon}^p$$ 
 +//Cockroft and Latham criterion (adimensional value) : ''COCKROFT''//
 $$ C = \int_0^{\overline{\varepsilon}^p} \frac{\sigma_1}{\overline{\sigma}}  d\overline{\varepsilon}^p$$ $$ C = \int_0^{\overline{\varepsilon}^p} \frac{\sigma_1}{\overline{\sigma}}  d\overline{\varepsilon}^p$$
-//Brozzo criterion//+//Brozzo criterion : ''BROZZO''//
 $$ C = \int_0^{\overline{\varepsilon}^p} \frac{2\sigma_1}{3(\sigma_1-p)}  d\overline{\varepsilon}^p$$ $$ C = \int_0^{\overline{\varepsilon}^p} \frac{2\sigma_1}{3(\sigma_1-p)}  d\overline{\varepsilon}^p$$
-//Ayada criterion//+//Ayada criterion : ''AYADA'' //
 $$ C = \int_0^{\overline{\varepsilon}^p} \frac{p}{\overline{\sigma}}  d\overline{\varepsilon}^p$$ $$ C = \int_0^{\overline{\varepsilon}^p} \frac{p}{\overline{\sigma}}  d\overline{\varepsilon}^p$$
-//Rice and Tracey criterion//+//Rice and Tracey criterion : ''RICE''//
 $$ C = \int_0^{\overline{\varepsilon}^p} \exp\left(\frac{3}{2} \frac{p}{\overline{\sigma}}\right)  d\overline{\varepsilon}^p$$ $$ C = \int_0^{\overline{\varepsilon}^p} \exp\left(\frac{3}{2} \frac{p}{\overline{\sigma}}\right)  d\overline{\varepsilon}^p$$
-//Parameters//+ 
 +**Parameters** 
 ^          Name      ^  Metafor Code  ^ Dependency         ^ ^          Name      ^  Metafor Code  ^ Dependency         ^
 |Criterion  |  ''RUPT_OP_LAW''  |          -         | |Criterion  |  ''RUPT_OP_LAW''  |          -         |
doc/user/elements/volumes/rupturecritere.1475968124.txt.gz · Last modified: by canales
Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki