Section Modulus calculation and optimization

AIM: TO CAL CULCULATE THE SECTION MODULUS & MODIFY THE SECTION TO IMPROVE THE OVERALL SECTION MODULUS.

DESCRIPTION

The section modulus -the ratio of moment of inertia of section about the neutral axis to the distance of outer most layer from neutral axis.

the section modulus is a geometric property which determines how much load a structure can withstand without failure.

S=I/Y

Where

S= Section modulus

I= min area moment of inertia

Y= distance b/w neutral axis & extreme end of the object

CALCULATION OF SECTION MODULUS BEFORE MODIFICATION

FOR COMPLETE SECTION

Y=578.2/2 = 289.1

2.01753*10^3=2017.1

S=I/Y

I=area moment of inertia.2.01753827*10^3 mm^4

Y= distance b/w neutral axis & extreme end of the object.289.1

S=2017.1/289.1=6.977mm^3

FOR MODIFIED SECTION

In this case i have added the embosses & increased the offset value of inner panel to 0.9mm to outer panel.

I HAVE MODIFIED THE EMBOSSES & ALSO INCREASED THE OFFSET VALUE OF 0.9mm

i have tried maximum modification on the object.

S=I/Y

IN THIS CASE MIN MOMENT OF INERTIA

I=area moment of inertia. 2.197.7*10^3=2197.7mm^4

Y =distance b/w the neutral axis & extreme end of the object.=289.1

S=2197.7/289.1

S=7.6018mm^3

CONCLUSION

Thus the strength of the hood assembly was sucessfully increased by modifying it. the safety of the vehicle also improved.

We can see that the value of S increased as the modification of the object & distance b/w the hood inner & outer panel is increased as S is directly proportional to moment of inertia.thus the section is proved that ok. & optimised better section modulus value.