You have this strong thin material jammed tight between two blocks of metal. Is it pressure that eventually causes weaknesses/leakage?
In: Engineering
Something else that happens besides wear is different rates of heat expansion. As the engine heats up and cools down, cycling, it expands and contracts. The gasket material, maybe a multilayer steel head gasket, may not expand at the same rate as the aluminum engine block and cylinder head. This leads to chafing and eventual failure.
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