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CAI tests characterize damage that can occur to airplanes or vehicles if hit by rocks or birds, or if damaged in an accident.
The measuring principle involves pre-damaging a test plate, which was tested previously using ultrasound to detect existing delaminations or imperfections, and then measuring the residual strength by means of a compression test.
This is why a compression after impact test consists of two parts:
The pre-damaged specimens are tested using a special compression test kit to determine residual strength. The compressive forces that arise are typically very high. A special compression test kit is used to load the test plates so they do not buckle. These test plates differ according to standard: