Structural Foam for chassis stiffening

Treblig said

Don't you defeat the purpose of "crumple" zones if you make certain parts of the body more rigid??

treblig

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Obviously no such thing in an ABody.

Most of a modern car's crumple zone is from the A pillar forward. Maintaining the integrity of the passenger compartment space frame is what's most important in a crash to protect the occupants. I think all the SAE papers reference that.