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  1. vikram manoj

    How to reduce fiber damage

    Hi, I’m doing a simulation of low-velocity impact on a composite laminate (32 layers, each 0.12 mm thick) using 15 J impact energy. I'm using a 3D Hashin failure model in my VUMAT. But I’m getting very high fiber damage (around 0.9), while the experimental paper I’m comparing with shows almost...
  2. vikram manoj

    Abaqus-Isight

    it says The following file(s) could not be located: impact.f.
  3. vikram manoj

    Abaqus-Isight

    Hi all, I am analyzing low-velocity impact on composite materials and performing reliability analysis by varying the elastic and strength properties of the laminate as random variables. I am using a VUMAT subroutine in Abaqus. However, when I load the input file into Abaqus Isight, the material...
  4. vikram manoj

    Doubt In Abaqus -low velocity impact

    Sir, i have one more doubt. I am applying an element deletion criteria. Is this the right way to do ? if((d11.eq. 0.9))then ngpt(nElement(k), nMatPoint) = 1 stateNew(k,i_svd_StatusMp) = 0 end if if (stateNew(k,i_svd_StatusMp).gt.zero) then if...
  5. vikram manoj

    Doubt In Abaqus -low velocity impact

    yes I am providing friction coefficient.
  6. vikram manoj

    Doubt In Abaqus -low velocity impact

    Hello all, I am modelling a 10 layer composite laminate with Frame (shown in figure). I am little bit confused regarding the boundary conditions to be applied for frame. I am applying two frames bottom frame and top frame. For bottom frame the bottom surface is fixed and on top frame i am...
  7. vikram manoj

    Low velocity impact

    Simulation filehttps://files.engineering.com/getfile.aspx?folder=7c34d849-b40a-491f-a36c-1f92e90988a3&file=Screenshot_(374).png
  8. vikram manoj

    Low velocity impact

    i am using carbon epoxy (T300/YH69) properties. I am attaching the material properties image, and yes i am using rigid impactor. I am considering a half plate which is subjected to multiple impact at some distances form the center of the plate, and on one side i am applying a Y-symmetry boundary...
  9. vikram manoj

    Low velocity impact

    i am performing a low velocity impact on a 32 layer [0/90] orientation of fiber . As we know the fiber tension failure starts form the bottom layers, but in my case the fiber tension damage starts at the top layers. what may be the reason. Please help me in this regard.
  10. vikram manoj

    deformation speed error in Abaqus during low velocity impact

    Hi, I am modelling a multi impact phenomena ( 5 impacts) on a composite plate with 8 layers. After running for three impacts the analysis is getting terminated by showing the error, In element 379 of instance COMP-0-1 the ratio of deformation speed to wave speed is 0.30000 at increment 1751551...
  11. vikram manoj

    Single element testing for VUMAT

    hello sir, when testing a single element for validation how much displacement has to be applied. suppose I am taking a element of 0.5 mm x0.5 mm x 0.5 mm how much displacement has to be applied.
  12. vikram manoj

    Abaqus low velocity impact

    i am modelling low velocity impact on composite plate with 8 layers. To reduce the simulation time I am considering q quarter model with two symmetry boundary conditions in x and y directional and fixed in other side. I am using a rigid impactor with some mass and velocity, my doubt is should...
  13. vikram manoj

    Abaqus- Multi impact on composite plate

    Thankyou sir. i have got the solution form the above link
  14. vikram manoj

    Abaqus- Multi impact on composite plate

    I am modelling dual impact or multi-impact on composite plate. How to model in Abaqus. I have model multi impact using VUMAT with two impactors and I have given predefined velocity to the two impactors. But I want to model in such a way that first impact should happen and then second impactor...
  15. vikram manoj

    Abaqus Modelling

    sir, i have done Abaqus standard analysis now i have 8 layers of campsite along with top and bottom frame how to import complete deformed model as we can import part only and also in explict step should we also apply again the boundary conditions and and preload pressure
  16. vikram manoj

    Abaqus Modelling

    I am modelling a composite laminate of 8 layers along with the frame on top and bottom. I am using VUMAt code and i am applying a predefined velocity in intial on the ball and applying pressure on top frame in step one. I need all my boundary conditions and pressure on the frame has to be...

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