Section Modulus calculation and optimization

SECTION MODULUS CALCULATION AND OPTIMIZATION

OBJECTIVE :

To calculate section modulus for the hood with different scenario to optimize the best one.

SECTION MODULUS :

• Section modulus is the quantity which determines a object's ability to resist external forces which flex the object.
• It also defines the strength of the object.
• The section modulus is the ratio between the moment of inertia of section to the distance of outer most layer of hood from the neutral axis

S = I/Y

S - Section modulus

I - Moment of Inertia

Y - Distance between the neutral axis and extreme end of the hood.

SCENARIO 1 :

• Hood design are taken a section at neutral axis.
• Hood inner and outer panel are assembled with thickening them with measurement of 0.75mm.
• Hood outer panel outer layer and inner panel bottom layer are taken for consideration for section modulus calculation.

SECTION MODULUS FOR SCENARIO 1 :

• The section modulus is the ratio between the moment of inertia of section to the distance of outer most layer of hood from the neutral axis

S = I/Y

S - Section modulus

I - Moment of Inertia

Y - Half distance of hood at neutral axis.

• MOIMIN = 8.048976618 e+03[mm^4]
• MOIMAX = 8.259420493 e+05 [mm^4] , Maximum moment of inertia

SMIN = 8048.977/ 238.75 = 33.7129910701571 mm

SMAX = 8.259420493 / 238.75 = 3459.44313842932 mm

SCENARIO 2 :

• Hood design are taken a section at neutral axis.
• Hood inner and outer panel are assembled with thickening them with measurement of 0.75mm
• Hood outer panel outer layer and inner panel bottom layer are taken for section modulus calculation
• In this scenario inner panel bottom layer are offset to 0.5mm and emboss are closed.

SECTION MODULUS FOR SCENARIO 2 :

The section modulus is the ratio between the moment of inertia and half distance of hood at neutral axis

S = I/Y

S - Section modulus

I - Moment of Inertia

Y - Half distance of hood at neutral axis.

MOIMIN = 4.519840925 e+03[mm^4]

MOIMAX = 8.078666280 e+05 [mm^4]

SMIN = 4.519840925/ 238.75 = 18.9312708900524mm

SMAX = 8.07866628/ 238.75 = 3383.73456753927mm

CONCLUSION :

• Moment of inertia and section modulus are calculated from scenario 1&2 with altering some design to get optimized value.
• Scenario 1 which is the calculation done with existing part achieved more moment of inertia and section modulus than scenario 2 and strength has been improved and which is recommended.