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  • Users: loyal979
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  1. loyal979

    Adhesive Layer in Wood

    Hello all, I am working on modeling two layers of wood bonded together with glue. To model the adhesive/glue layer in Abaqus, there is the cohesive zone method, but this method is intended to investigate failure/damage such as delamination. My goal is to evaluate the the effect of the adhesive...
  2. loyal979

    UFIELD Subroutine

    Hello all, I have some issues using ufield subroutine. I am trying to update two field variables (FV1 and FV2). The issue is that the values are always the same for both. It seems that whatever value FV1 has, the same value will be given to FV2. It looks like FV1 controls FV2, and they should...
  3. loyal979

    ABAQUS Subroutine

    Hi all, Can I use Abaqus subroutine to compute temperature for each node and send it back using dependent state variable (i.g. STATEV in UMATHT)? Thanks in advance
  4. loyal979

    ERROR: Couldn't find ABAQUSLM running on "server"

    Hi all, I am having this problem when I try to run verify commands such as abaqus verify -user_std to verify that I have linked Fortran to ABAQUS correctly. However, I get the following error and I am not sure what is causing this to happen. Please let me know if you have any suggestions...
  5. loyal979

    Compression Test

    Hello All, I am working on compression after impact simulations. Currently, my simulation is still running but I am monitoring my simulation and I noticed a lot of oscillations in my force (or stress-strain curve) while I don't see this behavior experimentally. I have attached an image of my...
  6. loyal979

    ALLSE -Strain Energy in impact simulation

    Hello All, I am performing impact simulations of composite materials in ABAQUS/Explicit. I am just wondering about the recoverable strain energy ALLSE, how do we interpret this energy in impact simulations? I have my ALLSE exactly the same as the internal energy (ALLIE) in the initial phase of...
  7. loyal979

    Absorbed energy from impact

    Hello I am performing an impact simulation of composite materials. I am just wondering how I would be able to calculate the absorbed energy from the kinetic energy. Is there a way to output the absorbed energy in ABAQUS? Thank you
  8. loyal979

    Modeling impact - Impactor velocity

    Hey All, I am modeling an impact simulation of composite materials in ABAQUS explicit. I have two steps on my model, one for impact and then the second one for compression after impact. I have defined the impactor velocity as a predefined field (initial velocity). I could not deactivate this...
  9. loyal979

    Impact and CAI simulations

    Hello all, I am working on compression after impact simulations and just wondering on how to stabilize the plate after impact to perform the compression test. Would introducing rayleigh damping to the model be good method to do it? or is there another way more efficient? Please share your...
  10. loyal979

    impact contact force

    Hi All, I am working on an impact simulation using ABAQUS/Explicit. I'm having trouble with estimating the contact force of the two objects. The impactor is 3D discrete rigid body, I defined the total mass to it and its initial velocity using the predefined field in the load section. I have...
  11. loyal979

    Stress Wave propagation

    Hi all, I have simulated a tension test of plate using ABAQUS explicit and the stress strain curve, that I got, has oscillation (stress wave propagation along the plate). I am just wondering how can I get rid or reduce the oscillation? Curve...
  12. loyal979

    Excessive Distortion

    Hi all, I am performing an impact simulation using hexahedral solid elements. When never I increase the energy level (e.g. striker mass or initial velocity), I get this error Excessive Distortion in # of elements. I have tried using reduced integration along with Enhanced hourglass control +...
  13. loyal979

    Contact definition for impact simulation

    Hi all, I am simulating an impact with damage for composite material and I am just wondering what is the appropriate contact definition for the impact simulation. Currently, I am using a general contact algorithm. Also, I am just wondering do I need to define contact between impactor and...
  14. loyal979

    USDFLD/VUSDFLD ABAQUS subroutine

    Hello All, Does anyone has a flow chart on how the USDFLD or VUSDFLD subroutine works? For example, in the case of damage initiation, how the subroutine send the failure indicators and how ABAQUS update stiffness matrix (or how to get the degraded material) and the stress state? I have looked...
  15. loyal979

    Composite failure analysis problem (VUSDFLD)

    Hi all, I am simulating a tensile loading in ABAQUS/explicit for a notched composite plate. I have implemented my failure initiation in a user subroutine VUSDFLD. My failure equation is as follow: f = (S11/Xt)^2 where S11 is the stress from abaqus and Xt is the laminate tensile strength. The...
  16. loyal979

    VUSDFLD and property definition

    Hi all, I have written a VUSDFLD ABAQUS user subroutine and I am just wondering on how to define material property based on the field variables. Could someone show me how to do that? and Should be the number of field variables be same as the number of failure modes? I have attached an image...
  17. loyal979

    Damage modeling

    Hi All, I am working on an impact modeling in ABAQUS/Explicit and currently, I am trying to initiate damage to my model using user subroutine VUSDFLD. I had no luck running the VUSDFLD, ABAQUS exited with errors and there was no error messages in the status file or any other files. So, I am...
  18. loyal979

    Plate impact modelling - contact displacement CDISP

    Hi all, I am modelling elastic impact test of a rectangular plate/composite and I am just wondering on what is the appropriate way to look at the deflection of the plate. I know how to look at the displacement using the field output unique nodal, but there is another option in the field and...
  19. loyal979

    ABAQUS - INSTANCE WITH CRITICAL ELEMENT: HM-NCF-1

    Hi all, I am doing dynamic analysis in Abaqus and I keep getting the attached message in my status file. where it says INSTANCE WITH CRITICAL ELEMENT: HM-NCF-1. I am not sure what casing this, could it be the stable time or mesh quality? Does anyone have any idea? Best...

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