Section Modulus calculation and optimization

AIM:

To Determine The Section modulus calculation and optimization

OBJECTIVE:

Use section of the Hood and calculate the section modulus.

Vary the section in such a way that new section is an improved version of previous section.

THEORY:

Section modulus is to find the geometric property for a given cross-section used in the design.

Calculate the section modulus using the formula

S=I/Y

S= Section modulus

I= Moment of Inertia

Y= Distance between neutral axis and the extreme end of the object

Section Modulus Calculation:

For studying the section modulus we need the cross section of hood. For that I created a cross section using intersection curve.

Study 1:

FIG: Cross-section of hood

Find the inertia using section inertia tool in NX:

Here the minimum moment of inertia, I = 1.490174018e+04 [mm^4]

The distance between neutral axis and extreme end of the object, Y = 878.6339/2 =439.316 mm

Therefore the Section Modulus, S = I/Y

S1 = 1.490174018e+04 [mm^4] /439.316 [mm]

S1 = 33.9203 [mm^3]

STUDY 2:

When I changed the distance between the outer panel and inner panel intersection curve by offsetted it by 0.5mm. I got the MOI as shown below:

Here the minimum moment of inertia, I = 1.512507238e+04 [mm^4]

The distance between neutral axis and extreme end of the object, Y = 878.6339/2 =439.316mm

Therefore the Section Modulus, S = I/Y

S2 = 1.512507238e +04 [mm^4] / 439.316[mm]

S2 = 34.4286 [mm^3]

CONCLUSION:

In this study, we take the minimum of inertia moment to analyze the minimum limit of hood deformation. Thus the section modulus of the front hood was calculated and compared with the new design.

S2 > S1

From the result we found out that increasing the cross-section area would give a better section modulus and helps in increasing the strength of the hood.