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crack propagation

Giorgio Carta's picture

Temperature induced crack propagation in structured media

This paper describes the propagation of an edge crack in a semi-infinite triangular lattice, consisting of identical point masses connected by thermoelastic links. A change of temperature, represented by a time-periodic series of high-gradient temperature pulses, is applied at the boundary of the lattice. In order to make the initial crack advance in the lattice a failure criterion is imposed, whereby the links break as soon as they attain a prescribed elongation.

Emilio Martínez Pañeda's picture

Numerical analysis of quasi-static fracture in functionally graded materials

This work investigates the existing capabilities and limitations in numerical modeling of fracture problems in functionally graded materials (FGMs) by means of the well-known finite element code ABAQUS. Quasi-static crack initiation and growth in planar FGMs is evaluated. Computational results of fracture parameters are compared to experimental results and good agreement is obtained. The importance of the numerical fit of the elastic properties in the FE model is analyzed in depth by means of a sensitivity study and a novel method is presented.

ndaphalapurkar's picture

Postdoc position — Modeling fragmentation in brittle materials

Hopkins Extreme Materials Institute (HEMI; hemi.jhu.edu) of The Johns Hopkins University is seeking a Postdoctoral Fellow to work on modeling fragmentation in brittle materials under extreme loading conditions. The potential candidate should have a Ph.D., with some background in fracture mechanics and experience working with the finite element or some other numerical method.

Nuwan Dewapriya's picture

Modelling fracture of graphene using Griffith’s criterion and quantized fracture mechanics

In armchair graphene sheets, crack propagates perpendicular to the applied strain, whereas crack propagation in zigzag sheets occurs at an angle to the straining direction. This occurs due to different bond structure along armchair and zigzag directions as shown in Fig. 1. Videos 1 and 2 show the fracture of armchair and zigzag sheets, respectively.

 

Fig. 1: Armchair and zigzag directions of graohene

criterion to stop crack analysis in xfem

Dear all,

my problem is dealing with a fatigue crack propagation analysis using XFEM (linear elastic case) with a prescribed initial imperfection in the modeled solid. What is the criterion to exit from such a kind of analysis?

Thank you in acvance!

Crack Propagation by Cohesive Element

Hi everyone,

 I've been working on crack propagation problem by cohesive elements in Abaqus.

 I have a sandwich struture where adhesive bonds two steels together. And I've attached part of my input file in the following.

 I can have the stress and strain distribution, but I really expect the crack will propagate in the midplane of the adhesives. I don't know whether I have to preset a line in the middle of adhesive as existing crac, or I can set some crack interaction to get the crack growth result. 

Open Position in Computation Solid Mechanics

Position: Computational Solid Mechanics Research Engineer

Company: Global Engineering Research and Technologies (GERT)

Location: Tucson, Arizona, USA 

Full/Part time: Full Time. 

Benefits: Yes.

Salary: Commensurate with Qualifications.

Remote employment: No. Must be willing to relocate to Tucson, AZ.

Cohesive Zone and Cohesive Element

Hi all,

I had been trying to reproduce a crack propagation problem using XFEM/Cohesive Zone. The problem is a 200x200x50 notched plate which has been simulated using plane strain elements 200x200 with 50 mm thickness.

I generated the cohesive layer (zero thickness) between the plane strain elements in the notch region, as cohesive elements and cohesive material properties which will define the crack initiation location.

Tuncay Yalcinkaya's picture

Full scholarships available at European Commission funded workshop on fracture and damage mechanics in Antalya / Turkey


European Commission' s JRC (Joint Research Centre) is organizing the 2nd workshop on physics based modeling of material properties and experimental observations in collaboration with TOBB University of Economics and Technology. The workshop will be held in Antalya/Turkey on 15-17 May 2013, and the special focus will be fracture and damage mechanics.


stathis's picture

Crack problems in A380 and BOEING 787

A point in which I may contribute from my oint of view is the crack problrem because of asymmetric bending

or because of the "off axis" bending. It is a problem in which I am working with Professor Sideridis at this time in National Technical University of Athens.

ABAQUS CRACK PROPAGATION

how to do a crack propagation analysis?

can abaqus be used for doing crack propagation analysis for plates with multiple cracks?

Crack propagation in ductile materials under monotonic loading

Hello everyone;

 I am Msc student and work on simulation of repairing the cracked steel girders using CFRP in abaqus.

I induce a geometrical crack in steel beam model and exepct it propagate in failure strain path, after increasing the load

I  have a question about crack propagation of steel girder under monotonic loading, what criterion of fracture is suitable for this case?

Crack propagation in composites in presence of shear and pressure loads

Hi,

Assume that we have a composite structure consists of isotropic layers with
a delamination (separation) between the layers. There is a compressive load
applying normal to layers surfaces and hence normal to the
delamination (crack) which closes the delamination, and a shear load tangential to the
crack surface.

the order of shear force is much smaller than the compressive load. can the
delamination propagate du to this shear force?

Haitao Zhang's picture

Fatigue crack growth FEA Internship

Title: Structural FEA Intern 

Employer: Schlumberger Technology Corporation

Location: Sugar Land, TX, USA

Starting Date: Available immediately 

Haitao Zhang's picture

Internship available in FEA of crack growth

Title: Structural FEA Intern 

Employer: Schlumberger Technology Corporation

Location: Sugar Land, TX, USA

Starting Date: 01/01/2011 

Mike Ciavarella's picture

paris law by ciavarella

Taxonomy upgrade extras: 

LOW-CYCLE FATIGUE CRACK PROPAGATION IN ABAQUS USING XFEM

 

Hi all,

 I´m traying to simulate a low-cycle fatigue crack growth in Abaqus 6.9 using xfem. My problem is to add the low cycle method to the xfem solution. 

I believe that the only current option for this would be to manually
create the loading curve and to do the analysis by a brute force
method but i may not be correct in this assumption however.

Please could someone explain a brief method.

i appreciate in advance.

 

 

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