Section Modulus calculation and optimization

AIM

• To calculate and compare section modulus value of hood oh car.

SECTION MODULUS

• Section modulus (s) is ageomatric property for given cross-sectionused in the desine of beam of flexural members. Abeam that has a longer section modulus than another will be stronger and capable of supporting greater loads.
• IT is know that the stress in a fiber is proportional to distace from the netural axis.if is the distance of the extreme fiber from netural axis then. here s reperesents section modulus (or) modulus of section S=1/Y
• S - section modulus .
• I - The moment of inertia . Y - THe distance between the NEUTRAL axis and the end of the object.

MOMENT OF INERTIA

• Here we are considering the area moment of inertia also know as the second moment of inertia . it is used in a section mechanical application , usually involving a section of any structure. the shape of the object and the plane of the section wil give us the 2d part it is called the section .
• When the area of the section increases. so the final result Which is the section modulusalso increases.
• Sowecould section modulus of the hood,and optimizing the section modulus value using NX- CAD

SECTON MODULUS CALCULATION AT SECTION OF THE HOOD :

MOI (max) = 4.859164874e+06[mm^4]

MOI (min) = 1.473158303e+04[mm^4]Y

• S= I/Y
• I= MOI (min) value is considered
• Y= Total distance /2 Total distance =877.02mm/2
• Y=438.51mm
• Therefore,s =14731.583mm^4/438.51mm

S=33.594mm^3

DESIGN OPTIMIZATION BY INCREASING THE DEPTH OF THE INNER PANEL BY 0.5MM

MOI (max) = 6.757678726e+[mm^4]

MOI (min) = 2.217382028e+04[mm^4]

• As per the section modulus equation,
• S=I/Y
• I= MOI (min) value is considered
• Y= Total distance /2 Total distance = 877.02mm/2
• Y= 438.51mm

Therefore,s= 22173.820mm^4/438.51mm

S=50.566MM^3

FINAL RESULT

• Thus the stiffness of the car hood has been increased by increasing its area moment of inertia.

CONCULSION

• Section modulus is directly dependent on the area moment of inertia and the distance from the netural axis.hence to improve the germetry of the carry more bending load, the section modulus can be improved by increasing the area MOI of a given section. We can increase the section modulus just increasing the gap between the outer& inner panel.
  
• hence we found out that increasing the cross-section area would give a better section modulus and helps in increasing the strength of the Hood.

Thankyou___