Section Modulus calculation and optimization

Section modulus is the measure of the strength of any section with respect neutral axis

the strenth is measured by the section modulus formula

S=I/Y

S = suction modulus

I = moment of inertia

resistance offered to any load creating moment, bending or twisting

Y = Distance from neutral axis to any extreme end

so as the moment of inertia increases strength of the material also increases and hence higher the section modulus. the strength of the material can be calculated by the calculation of section modulus

so we are going to calculate the value of section modulus of our hood panel

this is section of our hood

this details can be obtained in NX CAD by section inertian analysis

from this

I_max = 4.812141115x10^6 mm⁴

I_min = 1.445110490x10^4 mm⁴

^{Y = 880/2 = 440 mm}

^{S_max = I_max / y = 4.812141115x10^6 / 440 = 109310.48 mm3}

^{S_min = I_min / y = 1.445110490x10^4/ 440 = 32.92056818 mm3}

now we are changing hood design creating emboss with respect design criteria

then

I max = 4.929x10^6 mm4

I min = 1.475x10^4 mm4

^{S_max = I_max / y = 4.929x10^6 / 440 = 111895.45 mm3}

^{S_min = I_min / y =1.475x10^4/ 440 = 33.48409091 mm3}

CONCLUSION

• Compare these value od section modulus of the second model of hood is increased almost 1%
• MOI is increased with increase section area
• if increase the gap between inner and outer panel the section area increased and MOI also increased