高速水射流冲击下航空有机玻璃(PMMA)损伤行为

When the high-speed aircraft flies through the rain field, the components such as windshield are susceptible to the impact of rain droplets. To investigate the damage behavior of windshield glass under rain droplets impact, a Single Impact Jet Apparatus (SUA) was established based on the one-stage light-gas gun, and water jet impact tests were conducted on oriented and unoriented perspex (Polymethyl Methacrylate, PMMA) specimens. The results indicate that when impacted by the high-speed water jet, the main damage mode for the oriented perspex specimen is subsurface crazing fracture, while the main damage mode for the unoriented perspex specimen is surface damage. With increasing impingement velocity, peeling appears on the surface of both specimens, and is more severe for the oriented perspex specimen. Observation of the stress wave and damage propagation inside the samples finds that the subsurface delamination of the oriented perspex specimen is caused by the shear wave, and this damaged mode is more likely to cause peeling. This conclusion is further verified by multiple impact tests. The damage is also evaluated and predicted by the impulse obtained by the Polyvinylidene Fluoride (PVDF) piezoelectric film, and it is found that the damaged area is linear with the impulse.