Which effect occurs when excessive mechanical stress breaks polymer's covalent bonds within adhesive layer securing aircraft panel?

💡 Explanation

When excessive stress ruptures covalent bonds in an adhesive, crack propagation initiates as the material's structural integrity is compromised because broken bonds cannot effectively distribute load, leading to weakening. Therefore reduced panel stiffness arises as cracks worsen, rather than corrosion, increased conductivity, or altered radar section which depend on other material properties.

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