Section Modulus calculation and optimization
AIM: Use the Section from your Hood design and calculate the Section Modulus using the formula
SECTION MODULUS
The section modulus of the cross-sectional shape is of significant importance in designing beams or any other object. It is a direct measure of the strength of the beam. A beam that has a larger section modulus than another will be stronger and capable of supporting greater loads.
MOMENT OF INERTIA
here we are considering the area moment of inertia also known as the second moment of inertia. it is used in a sectional mechanical application, usually involving a section of any structure. the shape of the object and the plane of the section will give us the 2d part it is called the section.
when the area of the section increases the moment of inertia also increases. so the final result which is the section modulus also increases.
so we could say section modulus is proportional to the moment of inertia.
S = I/y
Where,
S = Section Modulus
I = Moment of Inertia
y = distance between the neutral axis and the extreme end of the object
CASE 1:
Existing design of Hood panel section modulus calculation is done by the intersection line is created on the hood design by the section curve tool and the lines are extracted as per requirement. Join all the lines and Inertia value is taken by using section inertia analysis tool.
S=I/y
Maximum inertia = 8.251557776*10^3mm^4
Minimun inertia = 5.016152412*10^5mm^4
y = 485.6022/2= 242.8011mm
S Max = 8.251557776*10^3/242.8011
=0.03398mm^3
S Min = 5.016152412*10^5/242.8011
=0.02066mm^3
CASE 2:
In this case offseted the inner panel curve to 0.8mm outward and compared with previous design for improve the section modulus.
S=I/y
Maximum inertia = 8.251557776*10^3mm^4
Minimun inertia = 5.016152412*10^5mm^4
y = 485.6022/2= 242.8011mm
S Max = 8.2260184*10^3/242.8011
=0.033879mm^3
S Min = 5.3612975*10^5/242.8011
=0.02208mm^3
Conclusion
Case 1=0.02066mm^3
Case 2=0.02208mm^3
By this calculation I conclude that, the section modulus value of hood panel is improved by offesting the inner panel in outward to 0.8mm. Now the strength is morethen the previous design.