Damage behavior of aeronautical perspex (PMMA) under high-velocity water jet impact

WANG Xuan; XU Jinjin; HOU Naidan; LI Yulong

doi:10.7527/S1000-6893.2021.26067

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2022 , Vol. 43 >Issue 12: 226067 - 226067

DOI: https://doi.org/10.7527/S1000-6893.2021.26067

Solid Mechanics and Vehicle Conceptual Design

Damage behavior of aeronautical perspex (PMMA) under high-velocity water jet impact

WANG Xuan ,
XU Jinjin ,
HOU Naidan ,
LI Yulong

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1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. Shaanxi Key Laboratory of Impact Dynamics and its Engineering Application, Xi'an 710072, China

Received date: 2021-07-06

Revised date: 2021-08-02

Online published: 2021-08-25

Supported by

National Natural Science Foundation of China (11832015, 51805538); Natural Science Basis Research Plan in Shannxi Province of China (2020 JQ-476); China Postdoctoral Science Foundation (2020M683570, 2021T140561)

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Abstract

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 (SIJA) 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.

Key words： perspex (PMMA); liquid-solid impact; water jet; rain erosion damage; PVDF piezoelectric film

Cite this article

WANG Xuan , XU Jinjin , HOU Naidan , LI Yulong . Damage behavior of aeronautical perspex (PMMA) under high-velocity water jet impact[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022 , 43(12) : 226067 -226067 . DOI: 10.7527/S1000-6893.2021.26067

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