Roof challenge
- Aim: To design the Automotive roof rail and all the necessary components to improve the strength of the roof as per the master section.
- Method:
- An automobile roof or car top is the portion of an automobile that sits above the passenger compartment, protecting the vehicle occupants from sun, wind, rain, and other external elements.
- Following images show the steps to be followed in order to complete the design.
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In order to improve the Qr value, either the Rx & Ry values need to be charged from the styling team, or another option is to improve the strength in that area using mastics or emboss need to be given. |
- Heat Distortion Criteria Calculations:
| roof | length | Rx | Ry | R | Thickness | I | A | B | C | W | status |
| FRR & BR1 | 2045.02 | 5740.729 | 2446.667 | 3431.042593 | 0.75 | 317.934 | 3.5378846 | 0.2903773141 | -2.3302726 | 1.497989314 | ok |
| BR! & BR2 | 2045.02 | 4851.51 | 6614.38 | 5597.425183 | 0.75 | 480.3 | 3.5378846 | 0.772835494 | -2.15167 | 2.159050094 | ok |
| BR2 & BR3 | 2045.02 | 3800.315 | 12243.357 | 5800.244889 | 0.75 | 340.61 | 3.5378846 | 0.829856739 | -2.305329 | 2.062412339 | ok |
| BR3 & RR | 2045.02 | #DIV/0! | 0.75 | 186.57 | #DIV/0! | -2.474773 | #DIV/0! |
The formula for W is broken into A, B, C and then calculated for ease of calculations.
- Snow load Prediction calculation:
| Snowed calculations | |||||||||||||
| 250< s < 380 | |||||||||||||
| area | Ly | Lx | L1 | L2 | S | Thickness | Rx | Ry | ALFA | Iy | (Rx+Ry/2)^2 | Qr | status |
| FRR & BR1 | 2055.8 | 1156.158 | 462.442 | 650.097 | 325.7598431 | 0.75 | 4643.35 | 2446.667 | 0.9849 | 755 | 12567085.27 | 10.53283382 | ok |
| BR1 & BR2 | 2055.8 | 1,098.96 | 650.097 | 476.35 | 239.5397465 | 0.75 | 3795.16 | 6614.38 | 1.1 | 6318 | 27089630.75 | 49.78847133 | ok |
| BR2 & BR3 | 2055.8 | 1,072.04 | 476.35 | 364.928 | 183.769326 | 0.75 | 12243.35 | 4334.12 | 0.86 | 469.8 | 68703127.9 | 2.433814956 | NOT OK < 3.1 |
| BR3 & RR | 2055.8 | 364.928 | #DIV/0! | 0.75 | |||||||||
- As it can be seen that the value of Qr is below the required value for a certain area and in order to improve it and improve the strength of the roof, embossing has to be done.
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