Roof Design and Develop the Essential Flanges and Reinforcements, and Check for Draft Analysis and also Section Modulus Report on the 0-Y Yection.

Project Objective: In this project, I am going to the Design of Roof and Develop the Essential Flanges and Reinforcements, and check for Draft analysis and also section modulus report on the 0-Y section.

01.About Roof design:

The roof is an essential part of a vehicle that plays an indispensable role in providing effective protection for you and those who drive with you from heavy snow, harsh rain, strong wind, harmful UV rays, etc. Like many other automotive body panels, the roof is subjected to environmental conditions. Hail and snowstorms may burst, tree limbs and branches may fall, etc. All this can damage the roof and cause sharp dents, dings, and scratches. Your vehicle can also become ruined in an accident. Though a defect may seem insignificant at first, it can lead to serious consequences. Whether your roof was dented due to downfall or roughed up in a collision, it is urgently necessary to find a replacement for it.

The roof panel is attached to the Biw of the car with the help of the front and rear roof rail. This attachment is done with the help of sealants. 1-2 bow roofs are attached depending upon the length of the roof along with the central roof rail. Longer the roof, more the number of the new roof rail. Other dimensions like strength and material are governed by factors like headroom, overall space, visibility, ergonomics, and the rules and regulation of the states where it is sold.

02.Curvature study on the roof:

Bow – roof prediction Formula is given as

W = 1.73x10^-3 x L+1.85x10^-8 x (R^2)/t + 1.10x10^-3 x l-2.68

L = Roof Length in X-Direction[mm](Roof dimension in 0-Y)

R = Roof curvature

R = 2(Rx*Ry)/(Rx+Ry)

Rx = X curvature

Ry = Y curvature

t = Roof plate thickness [mm]

l = Bow Roof Span [mm]

The condition to pass this test is given as,

OK<2.7mm<NG

For our arrangements :

03.Heat Distortion Criteria for Bow Roofs.

Snow Criteria:

The formula for snow criteria is given as:

Ly= Distance between the front and rear roof rails(mm).

Lx= Distance between left and right end roof rails (mm).

Y= Distance between center of the front roof rail to center of bow roof rail(mm).

S= Distance for which roof bow bears the divided load (mm).

ly= Geometrical moments of inertia of roof bow (Y cross-section)(mm).

Rx= Lateral direction of the curvature radius of roof panel Y cross-section on roof bow.

Ry= longitudinal direction curvature radius of the roof panel X cross-section on roof bow.

t= Roof sheet thickness(mm)

As we can see that all the values for Qr are above 3.1. Hence it has passed the Snow test too.

04.Draft Analysis:

Thus our design is safe from draft analysis for a 3-degree tool opening angle.

05.Section Modulus:

Google Drive File Link for CAD Model Roof Design:

https://drive.google.com/drive/folders/1_ea7olvXwtKw5nGzvFf4iAc-GBzIheJJ?usp=sharing

06.Conclusion:

Thus I have Designed of Roof and Develop the Essential Flanges and Reinforcements, and check for Draft analysis and also section modulus report on the 0-Y section.