Roof challenge
AIM:-
An automobile roof of car top is the portion of an automobile that sits above the passenger compartments, protecting the vehicle occupants from sun, wind, rain and the other external elements
CAR ROOF
The automobile roof consosts of the following parts
- The outer pannel
- Front roof rail
- Bow roof
- Center roof rail
- Rear roof rail
Front roof rail:-
Front roof rail is used to provide strength to the roof panel front and it also acts as link between windshield glass, roof panel and headliner(interior trim).Headroom clearance and visibility are two important criteria for the driver and both of them depends upon the front roof rail dimensions, hence it is important to select appropriate dimensions for the roof rail.
Bow roof:-
It is used to give the strength to the area between the front roof abd the center roof rail. Also it is created in the area between the rear roof rail to provide enough strength. It can be created in any numbers depending upon the roof length but the position of the bow roofs is to justified by the curvature study.
Center roof rail:-
Rear roof rail:-
ROOF IMAGES:-
HEAT DISTORTION CRITERIA:-
heat distortion temperature is the temperature at which metals soften and ddeforms under the specified load. While designing roof the criteria is taken into the consideration. We create the bow roof when the roof is long and flat to increase it strength. The position of the Bow roof is too justified and the justification is done by the curvature study
Bow roof prediction formula
To measure L:
TO MEASURE Rx:-
TO MEASURE Ry:-
TO MEASURE BOW ROOF SPAN (l):-
| SL NO. | BOWS | Rx(mm) | Ry(mm) | R(mm) | l(mm) | L(mm) | t(mm) | W | OK/NG |
| 1 | FR-BR-1 | 3394.44 | 5655.4 | 4242.69 | 528 | 2212.85 | 0.75 | 1.12 | OK |
| 2 | BR-1-CR | 6817 | 4821 | 5581.05 | 510.892 | 2212.85 | 0.75 | 2.02 | OK |
| 3 | CR-BR-2 | 4093.78 | 8369.48 | 5808.986 | 508.58 | 2212.85 | 0.75 | 1.819 | OK |
| 4 | BR-2-RR | 3314.72 | 12259.77 | 5386.45 | 593.8 | 2212.85 | 0.75 | 2.148 | OK |
SNOW LOAD PREDICTION FORMULA
| SL NO. | BOWS | ly | a | Lx | Ly | Y | S | Rx | Ry | t | Qr |
| 1 | FR-BR-1 | 312.358 | 1.055 | 113.564 | 2033.705 | 534.255 | 488.783 | 4469.255 | 3125.125 | 0.75 | OK |
| 2 | BR-1-CR | 1.525e^+3 | 0.899 | 1055.56 | 2033.705 | 412.45 | 413.703 | 4522.56 | 6355.56 | 0.75 | OK |
| 3 | CR-BR-2 | 310.12 | 0.415 | 1022.26 | 2033.705 | 356.36 | 502.85 | 3682.15 | 11329.65 | 0.75 | NG |
| 4 | BR-2-RR | 350.15 | 0.8956 | 1011.45 | 2033.705 | 625.225 | 550.52 | 4055.65 | 15325.55 | 0.75 | NG |
Here CR-BR-2 and BR-2-RR is failed and it can be overcomed by shifting the position and applying the embosses to the outer roof.
Draft analysis:-
The Draft Analysis command enables you to detect if the part you drafted will be easily removed. This type of analysis is performed based on color ranges identifying zones on the analyzed element where the deviation from the draft direction at any point, corresponds to specified values.Here the draft angle is given as 5 degree.
Conclusion:
Thus the essential flanges and reinforcements are created and analysis such as heat distortion and snow load analysis is done on it.