The 2020 SES documents will be released on October 18th.

The revised templates will now see the following included:

• The IAD Impact Attenuator Document is now a tab at the end of each SES.
• EV HV Protection, Containers, and Attachment are now included in each SES and applicable for Electric Vehicles only.

There are two categories for the 2020 SES:
All Steel Tube frames, including steel tube EV cars with steel or aluminum accumulators.
Aluminum equivalance may be used in the Steel Tube SES for Anti-Intrusion, EV Rear Impact, or Accumulator Containers and Mounting.

The Monocoque/Hybrid/Non-Ferrous SES is for all other cars.
Steel can be used for any part of the frame in the Monocoque/Hybrid/Non-Ferrous SES.
F.3.2.2 - Any and all steel grades are assigned the same material properties. No material properties for different grades may be used in the SES.

For a tube frame, IC car, the only changes are:

1. Looser SIS height regulation.
2. Enclosure of pressurized cylinders by frame tubes.

For any EV car:

1. Rear impact requires an upper+lower+diagonal or composite or differential mount equivalent.
2. Corner mounted accumulators are no longer required to attach to tube frames within 50mm of nodes.

For any composite car:

1. Non-quasi-isotropic layups will have to meet a calculated requirement for directional strength and stiffness.

It will incorporate seven factors:
a. Material mass fraction through 360 degrees.

Standard assumptions will apply to all teams.
These are being derived from industry and 2018 team data:
b. Ratio of Unidirectional laminate to woven fabric laminate strength in 0-direction.
c. Ratio of 0-90 fabric strengths in 0 vs 45 direction.
d. Ratio of Unidirectional laminate strength in 0 vs 90 direction.
e, f, and g are repeats of b, c, and d, but for stiffness.

The final minimum directional strength will be required to be between 50-100% of the maximum direction.
The final minimum directional stiffness will be required to be between 50-100% of the maximum direction.