Nano Lett., DOI: 10.1021/nl201376j

Have a prob in Analysing  FEM discrete model of Beam column connection [both monolithic and precast] for crack behaviour indisplacement controlled cyclic loading program.

Tried with various values of closed and open crack and co-efficient. 

applied -1 for crack and changed even the keypoint

 The main purpose of this paper is to complete the works presented by
Andrieux and Varé (2002) and El Arem et al. (2003) by taking into
account the effects of shearing in the constitutive equations of a beam
cracked section in bi-axial flexure. The paper describes the derivation
of a lumped cracked beam model from the three-dimensional formulation of
the general problem of elasticity with unilateral contact conditions on
the crack lips. Properties of the potential energy and convex analysis
are used to reduce the three-dimensional computations needed for the
model identification, and to derive the final form of the elastic energy
that determines the nonlinear constitutive equations of the cracked

Abstracts due Friday, Nov. 19, 2010 

APS March Meeting Focus session: "Tribophysics: Friction, Fracture and Deformation Across Length Scales"

March 21 - 25, 2011, Dallas, Texas
Details at http://www.aps.org/meetings/march/scientific/focus2.cfm#12.7.3

Invited speakers: Michael Marder (Univ. of Texas); Julia Greer (Caltech)

Organizers: Robin Selinger (Kent State), Jacqueline Krim (NCSU), Noam Bernstein (NRL)

Hi all,

I am conducting some cohesive crack simulations within the framework of XFEM. The cohesive model is an initially rigid traction-separation law for mode I.  In order to deal with negative values of the normal sepration/jump, I use a penalty stiffness K.

The example is pretty simple: an un-notched three point bending test where a crack is initiated at the bottom edge of the beam and grow vertically upwards to the upper edge. During the simulation, some negative jumps are observed. The convergence is very much dependent on the penalty stiffness K used. Even for some cases, no convergence obtained at all. I tried K from 10^3 to 10^10.

Could you please share your experiences in dealing with crack penetration in crack grow simulation?

i want to create a crack in a cantilever beam, but i m new in this field. please tell me how to model a crack in beam when beam is meshed using 1) beam elements 2) solid elements?

please refer any good tutorials in this field.

crack kink

 In this paper, a method for the construction of a cracked beam finite element is presented. The additional flexibility due to the cracks is identified from three-dimensional finite element calculations taking into account the unilateral contact conditions between the crack lips. Based on this flexibility, which is distributed over the entire length of the element, a cracked beam finite element stiffness matrix is deduced. Considerable gain in computing efforts is reached compared to the nodal representation of the cracked section when dealing with the numerical integration of differential equations in structural dynamics. The stability analysis of a cracked shaft is carried out using the Floquet theory.

One way of modelling multiple cracks in Ansys.

Hi All, 

Hi all,

I am currently working on mooney-rivlin materials. I wonder if someone have tried to compute GI, GII and GIII with the EDI because I don't understand how to compute WIII with mooney-rivlin.

Thanks a lot

Joachim Guilie

  There are three elliptical holes in the given plate, but make different angle with the direction of stress applied on the plate. I wonder if I can gain the solution listed below using analytical methods?(1) crack initiation will happen in which ellipse firstly, (2)the exaxt crack initiation location around the ellipse? And how?

Simulation of crack bifurcation in single crystal nickel base superalloys under mixed mode conditions

PhD position available at the Centre des Matériaux , ParisTech , starting fall 2009.

This 3-year project is fully funded by Mines ParisTech, SNECMA and ONERA.

Hello everyone,

Here is the problem I have: I'm modeling the geometry of a simple straight edge crack in a 2D elastic medium using Abaqus. I assume plain stress conditions. The crack makes an angle with the horizontal, is small enough to be considered as embedded in an infinite domain (ratio crack length/size of domain < 1/10) and I apply a vertical compressive load on top of my domain. I fixed one point in displacement at the bottom of it and the whole bottom edge is constrained not to move vertically.

2009-04-24 17:16:02

Hi all,

I am currently in my second year in Engineering school in France. I am doing research on 3D crack propagation in Rubber composites like tires.

And I wonder what is the best method to compute GI, GII and GIII. I have difficulties to choose between methods like EDI and VCCT for example.

I work in the finite strains case with static and dynamic. I also have difficulties to find papers on this subject with comparisons.

Can anyone please help me out with that

Thank You

Best Regards

Joachim Guilié

Hello everyone,

I need to create a semi-elliptical surface crack in a cylinder using ANSYS. CTMOPT macro allows modeling and meshing of this type of crack, but I am struggling to get this. If anyone knows detailed information regarding this, kindly let me know.

Thanking you,

Ashish Joshi

Hi all, I am new here and I have a question.  I have this hydroxyapatite material which is 60% porous and it is very brittle.  I got the material cut already and i was wondering when using SEM, is it possible to use the SEM to measure the crack length?  I am just wondering as to what the use of SEM is besides studying the pore size and to see if any cracks appear before and after cutting the material.  Is it still possible to find the crack propagation even though loading tests were not carried out on the material?  Can you suggest any reading materials on crack length n propagation?  Thanks!

Hello,I'm a student in engineering.  I wannto do simulation of the process of a cracked plate which is subjected to  tensile stress at the each end of the plate and perpendicular to the crack plane. with ansys .( crack type I )

stress concentration at the crack initiation location while operates at 120Hz frequency.how to do using abaqus software tool.Is there any one previously worked in this area.kindly assist me to resolve this problem.

The physics associated with self-affine crack formation and propagation is discussed. Some novel concepts are suggested for the mechanics of self-affine cracks. These concepts are employed to model the crack face morphology and, in turn, to solve various problems with self-affine cracks. It is shown that linear elastic fracture mechanics (LEFM) is a special case of self-affine crack mechanics and should be used only in length scales larger than the self-alfine correlation length. The theoretical results are confirmed by available experimental data.

Hello everybody,

I am searching precision of crack propogation in a bonded wafer double.I wrote a code but the problem is that when I want to solve it in ANSYS, the program is shutdown. I need help about it. Thanks for your helps...

 Greetings

 Volkan DALMISLI

P.S:The code is given below. 

finish
/title,sphere wafer
/filname,sphere wafer
/clear,start

*CFOPEN,volkan,dat           ! deletes the data file
*CFWRITE,releaserate     ! table heading of the data file
*CFCLOS
/PNUM, volu, 1 
/prep7