Section Modulus calculation and optimization
SECTION MODULUS ANALYSIS OF HOOD IN NX
AIM: To analyze the section modulus of the hood design to provide maximum stiffness better than the parent car.
INTRODUCTION: Hood is the part which dissipates the forces rather than passing it to the passenger cabin during collision. As a hood designer we should always ensure a better safety to the passenger with our design. Improving the stiffness of the hood the hood have to go for a section modulus analysis.
SECTION MODULUS: Section modulus is the geometric property of the given cross section of any shaft or beam structures. It is the direct measure of the strength of the shaft section or the beam section. Higher the section modulus the more the resistive it becomes to bending.
The stress in the outermost section of beam is computed with the help of section modulus. It is indicated by S .
Section modulus S=I/y
Where I= moment of inertia
Y= distance from neutral axis to the extreme end.
Section modulus depends only on the cross section of the structure.
NEED OF SECTION MODULUS: It is easier to calculate stresses in beam and an exact measure of strength of steel.
More section modulus more the member is resisting to bending of the beam.
TOOLS USED:
Intersection curve
Project curve
Datum plane
Section inertia analysis
Studio spline
PROCEDURE:
For calculating the section modulus we need a cross section of the hood. So create a datum plane on the center of the hood.
Create a cross section by inersecting curve option selecting the plane and hood as a referecne.
Select the section inertia analysis to analyse the cross section of hood.
CALCULATION:
For calculating section modulus we know S=I/y
In this case we need to consider the minimum value of section modulus I,e (S min) because the min value represent the load can withstand.
S=I/y
S= 1.480810243e+04(mm4)/437.83mm
=33.82mm3
CASE2:
Offset the inner panel 1mm upward and do the section modulus analysis.
S=I/y
S= 1.510051308e+04(mm4)/437.83mm
S= 34.48 mm3
The above comparision shows that case2 as good strength and as higher value of section modulus as compare to the case1.
CONCLUSION:
The section modulus of the hood is measured and founded the best strength value and learned about the process involved on section modulus and the calculations.