I see little likelihood of "stack" effects in our automotive applications, but the effect is real and a fire multiplier nevertheless, IMO. Additionally, many seem to ignore, aluminum is quite flammable if the needed temp it is exposed to can be reached, and a flammable core in a composite does promote that condition.
Regardless, for either of the conditions to be achieved in an automotive scenario, there are likely many other much worse problems at hand to be dealt with.
A steel or stainless cladding would negate nearly all the above flammability concerns.
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