Section Modulus calculation and optimization
Aim: To calculate the section modulus of the hood design and analysing the strenth criteria
Objective: To increrase the section modulus of the hood by making changes in the hood panels.
Section Modulus:
Section modulus is a geometric property for a given cross-section used in the design of beams or flexural members. Other geometric properties used in design include area for tension and shear, radius of gyration for compression, and Moment of Inertia and Polar Moment of Inertia for stiffness. Any relationship between these properties is highly dependent on the shape in question. Equations for the section moduli of common shapes are given below. There are two types of section moduli, the elastic section modulus and the plastic section modulus.
S=I/Y
Where
S = Section modulus
I= Moment of Inertia
Y= Distance from Neutral axis to the extreme end
Design Study 1:
Here we have taken the intersection curve for the hood outer panel and iner panel.
- Since it is open sketch, we cannot able to do section modulus. So create a sketch and join the inner panel sketch to the outerpanel sketch.
Opened Sketch:
Closed Sketch:
- Perform the section inertia analysis on the sketch, The results are
- Here we have to take Min Moment of inertia, because the hood starts breaking at this point.
Here the values are
MOI (MAX) : 9.068297022e+07[mm^4]
MOI (MIN) : 2.750453170e+05[mm^4]
Y = 439.6309 mm
S = I/Y
= 2.750453170e+05 / 439.6309
= 6.25*10^3 mm^3
Design Study 2:
- Here we increased the disance by 1mm between the outer panel and inner panel to increase the section modulus.
- Perform the section inertia analysis on the sketch, The results are
- Here we have to take Min Moment of inertia, because the hood starts breaking at this point.
Here the values are
MOI (MAX) : 9.031735902e+07[mm^4]
MOI (MIN) : 2.840251645e+05[mm^4]
Y = 439.6309 mm
S = I/Y
= 2.840251645e+05 / 439.6309
= 6.46*10^3 mm^3
So here we observed that the difference in section modulus and moment of inertia by changing the distance between inner panel to the outer panel.
Conclusion: The section modulus is done on the hood and observed the increasing the moment of inertia by canging the distance between outer panel and innerpanel. The result is satisfactory.