Impact Behavior of Coated Low‐Density Bodies

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Abstract
Impact failure of the coating of space shuttle thermal protection tiles was confirmed to occur by a flexure process at low projectile velocities. The critical projectile velocity was measured for a variety of projectile sizes. The same failure process and damage sequence was observed in quasi‐static indentation tests. In these tests, the mechanical behavior agreed reasonably well with the elastic model of an infinite plate bonded to a semiinfinite foundation. The model indicates that the critical fracture load could be increased by increasing coating strength, thickness, or foundation stiffness, or by decreasing the Young's modulus of the coating.

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