Assignment 8 (Report) Model of a cantilever beam on Patran/Nastran

BY: AUMAIR AZEEM MALIK (140919)

DECEMBER 5, 2014 INSTITUTE OF AVIONICS & AERONAUTICS

Air University, Islamabad

Task:

Using PATRAN / NASTRAN commercially available software, model a cantilever single cell

beam (analogous to aircraft wing) and apply a given Torque at its free end.

Data:

Dimensions: Height: 20 cm

Width: 30 cm

Length: 100 cm

Thickness: 0.2 cm

Material: Aluminum

Modulus of Rigidity (E) = 70 GPa

Poisson’s Ratio = 0.3

Applied Load: -1000 N at length = 100 cm

Multi Point Constraints: 11 RBE-2 elements to prevent de-shaping of beam

Properties: 2D Shell

Setting Tolerances

Constructing Geometry

Meshing the beam

Meshing completed

Creating RBE-2 Elements

Creating RBE-2 Elements

RBE-2 Elements completed

Applying Boundary Conditions (Loads & Constraints)

Applying Material Properties

Analyzing the model in Nastran and Accessing .xdb file

Results Variation of Axial Displacement along the length of beam Variation of Axial Displacement around the beam Variation of Axial Stress along the length of beam Variation of Axial Stress around the beam Variation of Shear Flow along the length of beam Variation of Shear Flow around the beam

Warping ….

Displacement Plot

Displacement Plot

Variation of Axial Displacement along the length of beam

Variation of Axial Displacement around the beam

Variation of Axial Stress along the length of beam

Variation of Axial Stress around the beam

Variation of Shear Flow along the length and around the beam