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I want to simulate the inclusion-matrix debonding under tensile load with abaqus cohesive element.But when I added the cohesive element around the inclusion, the stress filed was totally changed. I think it is because the stiffness of the cohesive element (K/G1/G2)was not right. Do you know how to choose it so it will not affect the stress field of the oringinal structrure? or can you give me an example? Thanks very much.
I am simulating a cube of sides 10 units. I have applied the
load as pressure of 16 units at top. The cube is meshed by usign a
global seed size of 5. It means, there are 9 elements and 27 nodes
(using C3D8R). I have used the material property of steel for instance.
The base of the cube is fixed and the sides are allowed to move
vertically. Now i want to calculate the nodal force at the centre of
the cube i.e. at the centroid of the cube (not in the centre of any of
the exterior sides).
The element is added displacement load in one direction, at the steptime=0, the nodal displacement is zero, and so as the integrated points' strain and stress. However, the internal force NFORC is nonzero. When we calculate internal force by ourselves, it is obtained by the integral for BT*stress. But the stress is zero, how Abaqus calculates the nonzero initial internal force?
The details can be found in the attachment.
I am having issues running an Eigen value simulation on a bridge model that I have developed. The model consists of a bridge super-structure supported by pinned connections on the ends of the bridge length and a roller support in the middle.
The model runs without errors when I do not request an Eigen value analysis, but aborts when I request an Eigen analysis. The message file sites the cause as a factorization error. Warnings also appear stating a zero pivot when releasing the 1st dof of the nodes associated with the roller connection.
I have attache the .inp file of my model. Do you know what may be causing this error?
Some funding agencies require that articles be published only in journals with impact factors greater than 1. Here's a list from 2012 that tells you which to choose (if you care about impact factors).
How could i apply simply supported boundary condition in Ansys Autodyn?
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A detailed report of our work on trying to find cohesive laws for interfacial fracture is attached. I will add the experimental data after a shorter version of this report has been published.
The reason for posting this report on iMechanica is so that people who want to replicate the tests or perform similar tests know what is involved. As we have found out, many details and potential problems faced by an experimentalist are hard to determine from the concise papers that are typically published as journal articles.
Please let me know if you have any questions.
On finding cohesive law parameters for foam-metal interfaces
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I'm writing a User Difined Element (UEL) for my research.
Would you please let me know if it's possible to call a file (txt, dat, etc) inside of the UEL or not?
IF (LFLAGS(3)=1) THEN
OPEN (UNIT = 10, FILE = "AAA.dat", STATUS = "OLD")
READ (10, *), StiffnessTable
Thanks in advance,
This subroutine using VUSDFLD is to
determine position of damage and provide evolution of damage surface, when some
elements failed. The “outer” damage status will transfer to “inner” damage
Now the problem is that when I read the
coordinates of material points, using coordMp（k,1),coordMp（k,1),coordMp（k,1), it returns wrong locations. Then I
tried a very simple loop:
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I am modelling an interactin between deformable and analytical bodies by utilisign Abaqus/Explicit. In order to define the contact between those objects I have selected surface-to-surface technique type and applied kinematic contact method as formulation method. As well I have selected individual output for a specially created set of my primary interest. Nevertheless, when I submit a job for analysis it gets aborted and the following warning errors appear:
The cpset or the surface parameter must be specified for history contact output
The nset parameter can only be used for bondstat or bondload output
Can anybody suggest me what should be done to overcome the problem? Thanks in advance!
As we know, the extended finite element method has been well used to simulate the localization band propagation and crack propagation without remeshing. It can deal with both strong discontinuity problems (displacement discontinuity) and weak discontinuity problems (strain or acceleration discontinuity). Now, I have always a question: when is strong and when is weak discontinuity using XFEM? In other words, what is the difference for the interpolation function and level set function or other function between strong and weak discontinuity? Thanks.
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
In engineering sciences, we usually end up using either the second- or the fourth-order differential equations, and the MWR (the method of weighted residuals) works pretty well for them.
The question is: how about the first- and the third-order differential equations? Why don't we see any applications of MWR for these odd-ordered differential equations? What gives?
I am getting displacement and force both zero. I am attaching .cae file please have a look where i am making mistakes.
i want to do crack anlysis in composite.i am thinking to use freefem++ or matlab for this purpose.please suggest me which one should i use.if any other,please recommend.
Applications are invited for the position of senior researcher/postdoctoral fellow in the following areas with special focus on multiscale defect mechanics of electronic materials and devices:
Call for Abstracts in Mini-Symposium on "Computational Modeling of Microstructural Evolution II”- ASME Congress 2014Submitted by mohsenzaeem on Sat, 2014-02-15 01:31.
We would like to invite you to participate in a mini-symposium entitled “Computational Modeling of Microstructural Evolution II” in ASME 2014 International Mechanical Engineering Congress & Exposition (http://www.asmeconferences.org/Congress2014/).
ASME Congress and Exposition will be held in Montreal's downtown convention center, 14-20 November 2014.