How much force does it take to break a motorcycle helmet?

How much force does it take to break a motorcycle helmet?

The average cracking force was found to be 140 lbf. The skull and helmet assembly could not be crushed in the compression stand even under the maximum force experienced by the load cell (470 lbf). It could be seen during testing, however, that the helmets without the skull cracked at approximately 190 lbf.

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