It is meaningful to identify the threshold load generating the delamination growth in the determination of the impact energy causing the damage of composite laminates subjected to small mass impact.The simulation results based on the analytical model show that the contact force drops sharply when the local contact rigidity is decreased, while the decrease of flexural rigidity of the whole plate does not introduce this feature into the response.A tester for small mass impact was fabricated and the impact tests were conducted on the laminates with variant energies.The contact force was detected by measuring the impactor responses and the laminate deflection at the impact point.It is shown that the contact force drops sharply at the theoretical delamination threshold load once the significant delamination is generated, and then goes up again.This phenomenon can be employed to identify the growth of delamination during the impact.To capture the sudden drop of the contact force obtained from the plate deflection, the sampling rate should be no less than 200 kHz.Otherwise, one may lose the sudden drop instant of the contact force curve slope.
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