Challenge

Section Modulus calculation and optimization

It is the ratio of total moment resist by section to distance between neutral axis to extreme layer.
It give us idea about load carrying capacity of structure.
As increase the Section Modulus of structure, total moment resistance also will be increasing, hence load carrying capacity increases.

- Mathematically

- Where,

- But generally mm^3 is preferred majorly in industries.

For calculate the Section Modulus of our designed Hood, we need the values of 'I' and 'y'.
To find this values, we have to take intersection of our Hood from center area axis, means a plane where its divides equally both sides.

In this Hood YZ plane divides equally, So now we have to use Intersection tool.
Keep first element as YZ plane and in second element select multiple elements as, Inner and Outer Panel.
So, in this way we get intersections. For calculate the Section Modulus, we need out side edges of both Panel.

By using Fill tool, we will get surface as shown in above image.
Now, we can measure the Ineratia, there is tool in Catia having icon like yellow cylinder.
This tool can measure Inertia for 2D as well as 3D.

So, here we have select Measure Inertia 2D and click on our surface. So information box will get appear as shown in above image.
We can see the values of M1 = 4.70777e-007 m^4 and M2 = 1.407e-004 m^4 from that box.
M1 is for minimum value of Inertia and M2 is for maximum value of Inertia.
We required value of M1 for our calculation, here its given in terms of m^4. So we have to convert it into mm^4.
So, M1 = 470777 mm^4. There is a option of Export, by click on it we get all value details in a Notepad file.

We have the value of Inertia, now we have to get the value of 'y', which is the distance between Neutral Axis to the Extreme edge point of the hood.
As shown in above image, we can use Position Sketch and make extreme points and measure the distance between them.
Here we have got the value of y = 485.127 / 2 = 242.56 mm.
Now we have both the values of I and y. So we can now calculate value of Section Modulus of Hood.
S = 470777 / 242.56
S = 1940.87 mm^3.

Now, for find more strength of hood, we can make new Section Modulus for Hood by changing the distance between Outer and Inner Panel of Hood.

Initially, we have created an offset curve of Inner panel by using Parallel Curve tool as 0.6 mm downward distance.
Then similarly as previous join curve, we have to join this new curve and make surface from it by using Fill tool.

Now we are further increasing the distance of Inner Panel (outer edge) from outer edge of Outer Panel by 0.8 mm.

By creating surface for change curve, we have to measure value of Inertia for it.
As shown in above image we get the value of M1 = 5.17626e-007 m^4 .
S = 517626 / 242.56
S = 2134 mm^3 .

Now, further increasing the distance of Inner Panel (outer edge) from outer edge of Outer Panel by 0.9 mm .

By creating surface for change curve, we have to measure value of Inertia for it.
As shown in above image we get the value of M1 = 5.23711e-007 m^4 .
S = 523711 / 242.56
S = 2159.10 mm^3 .

Now, further increasing the distance of Inner Panel (outer edge) from outer edge of Outer Panel by 1.0 mm .

By creating surface for change curve, we have to measure value of Inertia for it.
As shown in above image we get the value of M1 = 5.29848e-007 m^4 .
S = 529848 / 242.56
S = 2184.40 mm^3 .

Now, further increasing the distance of Inner Panel (outer edge) from outer edge of Outer Panel by 1.2 mm .

By creating surface for change curve, we have to measure value of Inertia for it.
As shown in above image we get the value of M1 = 5.42276e-007 m^4 .
S = 542276 / 242.56
S = 2235.64 mm^3 .

Hence, we have get new values of Section Modulus for Hood by changing the distance between outer edge of Outer Panel and outer edge of Inner Panel.
Here we have get the value of Section Modulus is S = 2235.64 mm^3 by changing the distance of Inner Panel (outer edge) from outer edge of Outer Panel by 1.2 mm .
Hence from above all calculations, we have observed that, value of Section Modulus increases. So simultaneously load carrying capacity of Hood will get increases.

Ship work like this
in your own course.