Leo Rauschenberger

6 Questions 2 Answers 0 Followers

Questions related from Leo Rauschenberger

Are there any formulas for the variation in outer diameter of a bonded piezoelectric PZT disc when excited at high frequency?

There is a very simple formula to calculate the variation in outer diameter OD of a PZT disc: Δ OD = (d31 * OD * V )/t where t is the thickness of the disc and V the voltage. Unfortunately,...

06 April 2020 8,855 0 View

What is the maximum element size in a FEA involving Lamb waves propagating in a composite?

I know that for isotropic materials, a rule for the maximum element size L_max is: L_max < lambda_min / 10 where lambda_min is the min. wavelength, defined as: lambda_min = c_T /...

12 March 2020 9,872 6 View

What is the correct layup notation for a laminate which contains a biaxial non-crimp fabric (NCF)?

The layup contains a biaxial non-crimp fabric (NCF) with orientations +45° and -45°. Would the correct notation be [(± 45)ncf ] , or should the fabric be noted like two separate unidirectional...

11 February 2020 1,596 0 View

Is any data available as to the angular dependence of Young's modulus in carbon/epoxy 2x2 twills?

I used analytical methods to find that the Young's moduli in wrap (0°) and fill (90°) direction of a carbon-fiber/epoxy twill are Ex=Ey=57 GPa. This, however, means that, when rotating the twill...

23 December 2019 9,203 1 View

In Abaqus, is it possible to remove some elements from a sequence obtained by getByBoundingBox() ?

Basically, I tried to do the following: >>> p1 = p.edges.getByBoundingBox(-1,-1,-1,1,1,1) >>> p2 = p.edges.getByBoundingBox(-0.26,-0.26,-1,0.26,0.26,1) >>> pickededges...

27 October 2019 4,810 3 View

When does Abaqus use the Total Lagrangian and when the Updated Lagrangian formulation?

Total and Updated Lagrangian formulations are generally available for both the implicit and nonlinear explicit dynamic analysis. But when is which applied? Does Abaqus mix them?

06 April 2017 6,736 6 View