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I used a deformation scale factor of 75 to show what is actually happening. The model consist of a 4-point bending test, where only half of it is moddeld (to save computation time), the symetrie axis is on the right. The beam is supported on the left, and the displacement is placed on a steel...

The image in the post above doesn't seem to work. These displacements are occuring when using dynamic explicit analysis

Hi all, I'm working on a simulation of a reinforced concrete beam in bending. It's a 2D-model, where i want to simulate the discrete cracking pattern of the beam in a 4-point bending test. I created a cohesive zone model to describe the descrete cracking pattern. However this model does not...

Hi all, I created a UMAT, that is used for lineair softening of a material in tension and shear (2D). For small models this UMAT works just fine, and correct results are obtained. However when using the UMAT in a larger model (+- 1500 UMAT elements, 1500 standard Abaqus material elements). i...

Hi, The pull-out data from the image above is the pull-out stress for a concrete-reinforcement interface. I calculated the values for concrete C30/35 based on the analytical pull-out model of Den Uijl and Bigaj (1996). Den Ujil, J. and Bigaj, A.J., (1996) A bondmodel for ribbed bars based on...

Hi all, For my research i want to model a bi-lineair softening curve of a cohesive element (see image below). This should be able to be modelled in Abaqus CAE with a tabular damage evolution. However the Abaqus user manual gives a formula to calculate the damage parameter for lineair...

Hi all, I have a problem to define the cohesive law for 2 sets of interface elements in Abaqus CAE (version 6.11.2). I know how to define a lineair elastic- and softening domain. But for my model i need the cohesive laws as shown in the image below. The pull-out behaviour (red line in the...

Hi, Thanks again for your reply. On this way i can indeed easy adjust the stack orientation. However to connect the parts correctly i need to tie al coincidents nodes manualy. Using the tie-constraints for the complete surface at once gives inaccurate results. This beceause the connecting...

compositesFEAguru, Thank you for the reply! The stack direction is indeed not consistent for the mesh. The elements that cause the error message, have an inconsistent mesh stack orientation. However since these are cohesive elements with a zero-thickness i can't adjust the mesh stack...

Hi all, I'm trying to model a 2D cohesive layer with a zero-thickness in Abaqus (6.11.2) The shape of the layer is a quarter circle. When modelling this i first create a cohesive layer with a certain thickness. I then convert the part of this cohesive layer to a orphan mesh, then edit the...

Hi all, I'm working on a 2D model in Abaqus 6.11.2 with a cohesive surface in it. This cohesive surface has the shape of a quarter circle. Due to this shape the cohesive surface is loaded from perpendicular (90 degrees angle) to parallel (0 degrees angle) to the surface. However the model does...

Hi Isyhadh, Many thanks for your reply's! I did just send you an e-mail with a reaction and the original files. Hoping you will look into it! Thanks in advance, Steven

For my graduation project I’m working on a model to describe cracking behavior. For this model I want to model a fibre-epoxy interface, see the attached figure 1 (due to symmetry only a quarter is modeled). The fibre part is modeled with lineair elastic material. The epoxy part is modeled with...

Hi Mohicine, Thank you for the reply. This is my understanding as well. For my simple model (see image) i found out the problem. Abaqus does not always correctly provide the element numbering. For cohesive elements: first the node numbers of the first "solid" edge should be definded, then the...

Hi all, I previously used a cohesive surface in a model to describe interface behaviour of my model. However the cohesive surface gave inacurate results (peak stresses). Therefore i want to create a model with cohesive elements instead of cohesive surfaces since the cohesive elements do not...

Hi all, I'm working on a study with cohesive elements and cohesive surfaces in it. However when studying the cohesive elements in Abaqus i found that the behavior is not as i expected. I'm using a traction seperation diagram to model the behavior (input=energy, thus area under the...

Hi all, I'm currently working on a model where i want to model cracking of a fibre-epoxy interface. I did model the fibre-epoxy interface with a cohesive surface. Ater initial debonding between the epoxy and fibre, the cracking is expected to continue in the epoxy material. The cracking of the...

Hi all, I'm dealing with the following problem: I'm relative new to Abaqus, to get used to moddeling cracks in Abaqus, I want to model a crack in a epoxy interface as described in: Alfaro, M.Suiker, A. (2010) Transverse Failure Behavior of Fibre-epoxy Systems, Journal of Composite Materials...