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  1. Home/
  2. Amit Kumar/
  3. Section Modulus calculation and optimization

Section Modulus calculation and optimization

AIM:- Section Modulus calculation and optimization   OBJECTIVE:-   Use the Section from your Hood design and calculate the Section Modulus using the formula  S = I/y  Where,  S = Section Modulus I = Moment of Inertia y = distance between the neutral axis and the extreme end of the object …

    • Amit Kumar

      updated on 10 Jun 2023

    AIM:- Section Modulus calculation and optimization

     

    OBJECTIVE:-  

    Use the Section from your Hood design and calculate the Section Modulus using the formula 

    S = I/y

     Where, 

    S = Section Modulus

    I = Moment of Inertia

    y = distance between the neutral axis and the extreme end of the object 

     

    Section Modulus:

    The section modulus (S) is geometry property of the cross section used for designing beams and flexural members. It does not represent anything physically.

     

    The formula of section Modulus: It may be defined as the ratio of total moment resisted by the section to the stress in the extreme fibre which is equal to yield stress.

    Which is equal to yield stress.

    Therefore

    S=I/y, Where

    S= Section modulus (mm^3)

    I = Moment of inertia of the section to the stress in the extreme end of the object (mm^4)

    Y= Distance between the neutral axis and extreme end of the object (mm).

     

    Moment of inertia is defined as the quantity expressed by the body resisting angular acceleration which is the sum of the product of the mass of every particle with its square of a distance from the axis of rotation.

    Or in more simple terms, it can be described as a quantity that decides the amount of torque needed for a specific angular acceleration in a rotational axis.

    Moment of Inertia is also known as the angular mass or rotational inertia. The SI unit of moment of inertia is kg m2.

    Moment of inertia is usually specified with respect to a chosen axis of rotation. It mainly depends on the distribution of mass around an axis of rotation.

    MOI varies depending on the axis that is chosen.

       In General form,

     The moment of Inertia is expressed as I = m × r2 

      where,

      m = Sum of the product of the mass.

       r = Distance from the axis of the rotation.

    Area Moment of Inertia:

    The area moment of inertia of a beam cross section area measures the beam ability to resist bending.

    The larger the moment of inertia less will be the bend.

     

    Where,

    M = Bending Moment

    I = Area moment of Inertia

    E = Young modulus

    R = Radius of gyration

     

    Neutral Axis: When beam is subjected to pure bending the top most fibres of the beam are subjected to maximum compression, while the bottom most fibre of the beams are subjected to maximum tension.

     

                                              

    This picture contains the following scene, Diagram of a beam on its narrow edge supported at both ends.

    A man is walking on a straight beam. Diagram of a beam resting on its flat side supported at both ends.

    A man is walking on the straight beam and its bending in the middle.

    Here:- we are considered the innerpannel section of the to analysis the section inertia analysis after doing the we got the desired results shown in the above image.

    I(Max) = 1.801877859e+08[mm^4]

    I(Min) = 6.149959579e+05[mm^4]

    As per the section modulus equation,

    S = I/Y

    I = MOI (min) Value is considered

    Y = Total distance / 2,

    Total distance ,Y= 438.2696 mm

    Therefore,

    S = 0.01403237mm^3

     

    Case2:-

    I(Max) = 1.801877859e+08[mm^4]

    I(Min) = 6.149959579e+05[mm^4]

    As per the section modulus equation,

    S = I/Y

    I = MOI (min) Value is considered

    Y = Total distance / 2,

    Total distance ,Y= 438.2696 mm

    Therefore,

    S = 0.01403237mm^3

     

     

     

    Results:

    After the calculations of the above 2 cases the section modulud of an S1 and S2 the difference is 14.458mm

    >The section modulus value of case 2 is higher than the case 1

    As we increase the section area, the moment of inertia & section modulus increase which means strength and load material also increase.

    Which the moment of inertia directly proportional to the strength of the material.

     

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