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  • Users: alinalin
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  1. alinalin

    Inertia Relief Analysis of Nastran

    Can I use Nastran Inertia Relief to analzye an unconstrained system with unbalanced froces and moments? The system is not supported and not constrained (for example, an aircraft in flight), and have translational/rotational accelerations due to nonzero total forces and moments? I am not able...
  2. alinalin

    Patran keyboard shortcuts for zoom out/in/rotate

    Is there any keyboard shortcuts for zoom/in/out/rotate in Patran?
  3. alinalin

    how to divide a line into three unequal segments

    I try to divide a line into three unequal segments. The ratio is 0.1, 0.8, 0.1. Is there any way of doing it in one command instead of dividing the line by two times. New lines after the old line is divided. Since I have to perform this operation on many lines, it will greatly simplify my model...
  4. alinalin

    Nonlinear modeling of pressure vessel

    I use COSMOSWORKS to model a pressure vessel (like cylindrical shape) made of fabric having a large force applied on the top partial flat surface and internal pressure inside. The thickness is very small, and diameter-thickness ratio is around 4*10^4. I first use linear static analysis and it...
  5. alinalin

    how to remove rigid body motion of an air vehicle

    I have built a structural model for an air vehicle. As it contains tension-only element, nonlinear analysis need to be applied. I don't know how to constrain six degrees of freedom in order to remove rigid body motion. There are some symmetric conditions existing, but I still can not constrain...
  6. alinalin

    how to combine two types of elements in meshing

    Can I mesh an area with shell elements and its edge with beam elements? I use ANSYS to mesh one edge of the area first using 1D beam element, and then mesh the area using 2D shell element. In this way, the nodes generated from the beams elements, and the nodes generated from shell elements both...
  7. alinalin

    about the calculation of stresses in ANSYS

    Use ANSYS to calculate the stress of a piezoelectric plate. The transverse stresses(Szz,Sxz,Syz, where z is the thickness direction of the plate) on the free surface where no forces and pressure are applied are not zero, and the magnitude is not too small to be neglected. I have verified that...
  8. alinalin

    How to apply traction free boundary on the top surface of a plate?

    How to apply traction free boundary condition(stressxz,stressyz,stresszz are zero) on the top surface of a thin piezoelectric plate? Even if I apply zero value to Fx,Fy,Fz on the surface, I can still get nonzero value of stressxz,stressyz on this surface. Is there any way of applying shear...
  9. alinalin

    Are there any books about coupled field analysis?

    The examples in the online manual are not enough. Thanks!
  10. alinalin

    modeling of a piezoelectric composite plate

    Use ANSYS to analyze a piezoelectric composite plate: Is there any way of inputing the material matrices of piezoelectric composite before transformation and then add an angle? I searched for the elements of the structural layered composite, and they don't have the DOF of voltage-that's why I...
  11. alinalin

    questions about modeling composite piezoelectric plates

    I met a problem when I used ANSYS to model a composite piezoelectric plate. I assigned 4 DOF (ux,uy,uz,volt) to all nodes of the two-layer plate(both layers are made of piezoelectric materials). And the plate are simply supported at four edges and voltage is applied on the top surface...

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