Section Modulus calculation and optimization

Aim - To calculate and improve the section modulus of hood  useing Nx cad software 

Objective -1) know about applications and importance of section modulus .

                  2) To get insight for improvement of section modulus .

                  3) Calculate the section modulus 

Section modulus of inertia .

 Section modulus of inertia is the geometric property that is used to design beams and flexural members .

  we have to design the components that should with stand higher  bending stress

 The relation between bending moment is given by beding equation.

         

 where ,

M- bending moment in N-m

I- Area modulus of inertia in mm^4

Y- tip distance from neutral axis in mm

E - modulus of elasticity N/mm^2

R- radius of curvature of beam.

 From the above equation by considering  relation between first two ratios we get .

        

 from the above equation  I/Y is the section modulus  that is multiplied with bending stress.

 Higher the section modulus higher is the strength of component .

Calculation of  moment of inertia (I)  by useing  nx cad 

1. Thicken the parts and Create a plane through curve  with percentage arc length 50% on the body
2. Use intersersection command but ensure the tangent face selection and entire assembly work bench is active . select datum plane as set 1 and rest body as set 2 in intersection tool box
3.      Intersection curve is  created as below
4.  Now project the curve on created datum plane and sketch the dis continuties with studio splin with single face on 
5. search  section inertia analysis  and select the cuve  
6.  We will get the moment of inertia

 7. measure the thistance of component along tips by measure tool which is in analysis tool bar .

 8. Use the formula I/Y =Z

Y= tip distance 

thus we have calculated the section modulus z

Observations 

case 1.

actual analysis of the existing cross section 

M-1.4226*10^4 mm^4

Y= 879.64/2

   = 439.82 

 

Section modulus of existing  section =32.34 mm^3

Case 2. Improvement in existing  section modulus of inertia 

 

 

Increaseing in gap between hood inner and outer panel by 0.8 mm increased the section modulus of inertia by 2.90%

Conclusion -

 Thus we have calculated the section moment of inertia by useing Nx cad and found out that by increaseing  cross section we  will increase the section modulus .