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F.6.4.1 Frame Members of the Side Impact Structure must be constructed of closed section tubing meeting F.3.2.1.e or F.3.2.1.f, as applicable
F.6.4.2 With proper Triangulation, Side Impact Structure members may be fabricated from more than one piece of tubing.
F.6.4.3 The Side Impact Structure must be comprised of three or more tubular members located on each side of the driver while seated in the normal driving position
F.6.4.4 The Upper Side Impact Member must:
a. Connect the Main Hoop and the Front Hoop.
b. Be entirely in a zone that is parallel to the ground between 240 mm and 320 mm above the lowest point of the top surface of the Lower Side Impact Member
F.6.4.5 The Lower Side Impact Structure member must connect the bottom of the Main Hoop and the bottom of the Front Hoop.
F.6.4.6 The Diagonal Side Impact Member must:
a. Connect the Upper Side Impact Member and Lower Side Impact Member forward of the Main Hoop and rearward of the Front Hoop
b. Completely Triangulate the bays created by the Upper and Lower Side Impact Members.
Explanation
For context, the Side Impact Structure (SIS) is the structure of the chassis that protects the driver from side impacts. Here is our Side Impact Structure, which is made up of an upper, lower, and diagonal member:
Side Impact Structure frame members must be made of closed section tubing (i. e. tubes that have continuous sidewalls) and comply with rules F.3.2.1.e or F.3.2.1.f, as applicable. F.3.2.1.e outlines the requirements for the Side Impact Structure tubes, and F.3.2.1.f outlines requirements for Upper Side Impact Members which are made of multiple tube or bent tubes. The "as applicable" is reffering to the possibility of having multiple tubes or bent tubes as the Upper Side Imact member.
Closed section metal tubing
Open Section metal tubing
F.6.4.2 With proper Triangulation, Side Impact Structure members may be fabricated from more than one piece of tubing.
If the tubing is triangulated correctly, the Side Impact Structure members are allowed to be made of multiple tubes. The members are denoted by different colors in the graphic above. These members can be made of multiple tube as long as they are correctly triangulated.
The following SIS examples were pulled from the SES template, which shows both acceptable and unacceptable configurations.
Unacceptable configurations are due to a lack of triangulation in the red region. There is a dotted line shown in each of these examples which represents the location of a missing tube which if added, would fix the triangulation issue.
In the first 4 examples, each SIS member is made of a single tube.
In the last 6 examples, each SIS member is made of multiple tubes.
F.6.4.3 The Side Impact Structure must be comprised of three or more tubular members located on each side of the driver while seated in the normal driving position
The Side Impact Structure has to be made of at least 3 tube members on each side of the driver, and they should appear at the side of the driver when the driver is sitting in a normal driving position.
F.6.4.4 The Upper Side Impact Member must:
a. Connect the Main Hoop and the Front Hoop.
b. Be entirely in a zone that is parallel to the ground between 240 mm and 320 mm above the lowest point of the top surface of the Lower Side Impact Member
The Upper Side Impact Member has to connect to both the Main Hoop and the Front Hoop. The member also has to be in a zone which is between 240 mm and 320 mm above the uppermost surface of the Lower Side Impact member.
The Upper SIS member is connected to both Roll Hoops
The Upper SIS fits within a zone that is between 240 and 320 mm above the uppermost surface of the Lower SIS.
Here are images from our SES that show how the Upper SIS follows the zone rules.
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F.6.4.5 The Lower Side Impact Structure member must connect the bottom of the Main Hoop and the bottom of the Front Hoop.
The Lower SIS member has to connect to the bottom of both Roll Hoops.
F.6.4.6 The Diagonal Side Impact Member must:
a. Connect the Upper Side Impact Member and Lower Side Impact Member forward of the Main Hoop and rearward of the Front Hoop
b. Completely Triangulate the bays created by the Upper and Lower Side Impact Members.
The diagonal Side Impact Member has to connect to the Upper SIS and the Lower SIS somewhere in between the Roll Hoops. The diagonal member also must triangulate the space between the upper and lower SIS.
The diagonal SIS connects the upper and lower SIS in between the Roll Hoops (pink circles show where this happens) while also making the rectangular shape between the upper and lower SIS into two triangles.
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