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F.6.2.1 Frame Members of the Front Bulkhead Support system must be constructed of closed section tubing meeting F.3.2.1.b
F.6.2.2 The Front Bulkhead must be securely integrated into the Frame.
F.6.2.3 The Front Bulkhead must be supported back to the Front Hoop by a minimum of three Frame Members on each side of the vehicle; an upper member; lower member and diagonal brace to provide Triangulation.
a. The upper support member must be attached 50 mm or less from the top surface of the Front Bulkhead, and attach to the Front Hoop inside a zone extending 100 mm above and 50 mm below the Upper Side Impact member.
b. If the upper support member is further than 100 mm above the Upper Side Impact member, then properly Triangulated bracing is required to transfer load to the Main Hoop by one of:
- the Upper Side Impact member
-an additional member transmitting load from the junction of the Upper Support Member with the Front Hoop
c. The lower support member must be attached to the base of the Front Bulkhead and the base of the Front Hoop.
d. The diagonal brace must properly Triangulate the upper and lower support members
F.6.2.4 Each of the above members may be multiple or bent tubes provided the requirements of F.5.2 are met.
F.6.2.5 Examples of acceptable configurations of members may be found in the SES
Explanation
F.6.2.1 Frame Members of the Front Bulkhead Support system must be constructed of closed section tubing meeting F.3.2.1.b
The Front Bulkhead requires support frame members to integrate it into the rest of the chassis. These frame members are highlighted in blue, purple, and pink on our chassis in the image below. The Front Bulkhead Support System must be made of closed section tubing meeting F.3.2.1.b.
F.6.2.2 The Front Bulkhead must be securely integrated into the Frame.
The Front Bulkhead has to be intagrated fully into the chassis to ensure that it acts as a good frontal impact protection for the driver's legs.
F.6.2.3 The Front Bulkhead must be supported back to the Front Hoop by a minimum of three Frame Members on each side of the vehicle; an upper member; lower member and diagonal brace to provide Triangulation.
a. The upper support member must be attached 50 mm or less from the top surface of the Front Bulkhead, and attach to the Front Hoop inside a zone extending 100 mm above and 50 mm below the Upper Side Impact member.
b. If the upper support member is further than 100 mm above the Upper Side Impact member, then properly Triangulated bracing is required to transfer load to the Main Hoop by one of:
- the Upper Side Impact member
-an additional member transmitting load from the junction of the Upper Support Member with the Front Hoop
c. The lower support member must be attached to the base of the Front Bulkhead and the base of the Front Hoop.
d. The diagonal brace must properly Triangulate the upper and lower support members
The Front Bulkhead Support system has to be made up of at least 3 members on either side of the car, and these members must conect the Front Bulkhead to the Front Hoop. There must be an upper member, a lower member, and diagonal members that triangulate the upper and lower members.
In the image on the right, the Upper Front Bulkhead Support members are highlighted in blue, the Lower Front Bulkhead Support members in pink, and the diagonal bracing members in purple.
a. The Front Bulkhead Upper Support member must be connected to the Front Bulkhead no lower than 50 mm from the top of the Front Bulkhead, and connected to the Front Hoop in a zone that goes from 100 mm above to 50 mm below the Upper Side Impact Structure (SIS) member.
In our SES, we show how this rule is followed.
SES Image 1:
This image is just showing the Front Bulkhead Support Members (FBHS). Since the upper FBHS member is connected to the very top of the Front Bulkhead, they did not need to prove that it is within 50 mm from the top of the Front Bulkhead, as this is apparent.
SES Image 2:
The side of the Upper FBHS member that connects to the main hoop has to be within a range of 100 mm above and 50 mm below the upper SIS member. This image shows that we are only 45 mm below the Upper SIS member, which is in the allowable range.
For some context, the Upper SIS members are highlighted in red.
b. If the Upper FBHS member is more than 100 mm above the Upper SIS, you have to find a way to transfer it's load path to the Main Hoop either via the Upper SIS member, or an additional member that transfers the load from this new node (the Upper FBHS and Front Hoop node). This is probably because the Upper FBHS would create a bigger bending moment about the Upper SIS as it gets further away from the Upper SIS in case of a frontal impact. The load path needs a more direct way to traverse through the chassis if the Upper FBHS and Upper SIS are not in line with each other enough.
Below are two drawn pieces of chassis in side view to illustrate my point:
In this chassis, to redirect the load path from the Upper FBHS to the Main Hoop, the green member accomplishes this by routing the load path back to the Upper SIS member to make this work in a rules compliant way.
# not sure if this is legit
In this chassis, the load path is redirected directly to the Main Hoop using the green member. This is also a rules compliant way to deal with the Upper FBHS being more than 100 mm above the Upper SIS.
c. The Lower FBHS member must be attached to the chassis at the bottom of the Front Bulkhead and the bottom of the Front Hoop.
In the image on the left, notice how the Lower FBHS member (pink) is connected to the bottom of the Front Bulkhead and the bottom of the Front Hoop (circled in red)
d. You have to have diagonal FBHS braces that properly triangulate the Upper and Lower FBHS members.
In the image on the left, the diagonal braces we used to make our FBHS members rules compliant are highlighted in purple.
F.6.2.4 Each of the above members may be multiple or bent tubes provided the requirements of F.5.2 are met.
The FBHS members are allowed to be made of multiple or bent tubes, as long as they follow the bent tubes rules in F.5.2 which basically say that the bends have to be structural, etc.
F.6.2.5 Examples of acceptable configurations of members may be found in the SES
There are some examples of configurations that are rules compliant for the FBHS members in the base SES (you won't find them in a completed SES because they will have been overwritten). If you want to see a base SES, you can find it on the FSAE Online website .
The following are images of the FBHS comfigurations from the blank SES:2
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