EME236 Properties and Mechanics of Materials
Spring 2010
Lab 02:
Curved Beam Analysis
Today you will use SolidWorks and COSMOSWorks to analyze the stress in curved
beam designs.
The following tutorial is adapted from on in Analysis of Machine
Elements using COSMOSWorks by John Steffen.
During this tutorial, you will be
introduced to the following COSMOSWorks capabilities.

ability to use a split line to demark and select separate faces.

ability to simulate pin loading of a part

ability to determine safety factor using Design Check feature

ability to look at different types of stress definitions

ability to use the probe tool to create a cross section stress profile.

learn to compare theoretical stress to FEA calculated stress.
CClamp
Simple Curved Beam
Part A:
Development of a FEA StressStrain Model for a Simple Curved Beam.
Step 1: Theory:
A simple curved bean is shown
below.
By drawing the FBD, it can be seen that the
internal reactions of the beam include both a normal force and a bending force.
Both the normal force and the bending moment contribute to the normal stress in the
cross section of the beam.
P
N
M
s
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentFor equilibrium to be maintained
F
P
N
=

=
∑
0
M
M
Ps
= 
+
=
∑
0
N
P
=
M
Ps
=
where
s
is the distance from the line of the force
P
to the neutral axis of the cross section
of interest.
Stress can be calculated using the bending stress formula and axial stress formula applied
at the cross section.
bending
Mc
I
σ
=
axial
N
A
σ
=
where
bending
σ
is the bending stress due to the moment, M.
c
is the distance of point of interest to the neutral axis
I
is the second moment of area of the cross section and is given by
bh
I
=
3
12
axial
σ
is the axial stress set up by the normal force, N,
on the cross section
A
is the area of the cross section
The total stress will be the sum of the bending and the normal stress such that
total
N
Mc
A
I
=
+
σ
Bending stress can be both tensile (+) and compressive () depending upon the value of
c
.
For this example, the axial stress will be tensile (+).
This is the end of the preview.
Sign up
to
access the rest of the document.
 '08
 Puvvada
 Force, Stress, Curved Beam Analysis

Click to edit the document details