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← ScienceWhich outcome occurs when rapid heating induces spallation?
A)Acoustic impedance mismatch creates tensile stress✓
B)Increased thermal conductivity stabilizes matrix
C)Capillary action enhances interfacial mixing
D)Viscosity damping prevents crack propagation
💡 Explanation
Rapid heating during spallation generates stress waves within a material; acoustic impedance mismatch causes wave reflection, leading to tensile stress that exceeds the material strength because fracture occurs, therefore spallation results from internal tensile failure, rather than thermal conduction or damping.
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