Can anyone help with strange deflection in ANSYS 15 tensile test simulation?

AI Thread Summary
The discussion focuses on a user experiencing unexpected deflection in a tensile test simulation of a dumbbell-shaped specimen using ANSYS 15. The model consists of a laminate with six layers of E FiberGlass oriented at +/-45°, and the user is applying specific boundary conditions for movement in the X, Y, and Z axes. Suggestions include applying symmetry boundary conditions to the cut edges and constraining the specimen's end in all directions while prescribing an axial displacement. To prevent lateral deflection, it is recommended to restrict deformations to in-plane only by fixing displacement in the Z direction. The user seeks assistance in identifying the cause of the strange deflection observed in the simulation.
Rawllet
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TL;DR Summary
Tensile test, using ACP Pre and Static Structural modules, of a fiber glass laminate with 6 layers orientated +/-45°.
Hello everyone!

I am trying to modelate a tensile test of dumbbell-shaped specimen under ACP PrePost and Static Structural modules. The laminate I am configuring consists of 6 laminas of E FiberGlass orientated +/-45°. For simplicity I am working with 1/4 of the geometry and the boundary conditions are 2 displacements. One that let's movement only in X axis and the other only let's movement in Y and Z axis.

My problem is a strange deflection that is shown in the solutions spot and I do not know what could be the reason of it. I don't know if is because of the boundary conditions or maybe a bad laminate configuration.

I wii be very thankful for any help. I attached a few photos that could help in the understanding of the problem.

laminate configuration.png

shell mesh.png

boundary condition 1.png

boundary condition 2.png
stress_1.png

stress_2.png


Thank you in advance.
 
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Apply symmetry boundary condition to cut edges. Constrain the end of the specimen in all directions and prescribe axial displacement value. To avoid lateral deflection you can restrict deformations to in-plane only using boundary condition applied to the whole surface of the specimen with fixed displacement in Z direction.

shell mesh.png
 

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