Time-frequency analysis of acoustic emission signals in composite materials under repeated impact conditions

被引：0

作者：

Du, Jinbo ^{[1
,2
,3
,4
]}

Bao, Yunpeng ^{[1
]}

Wang, Weiwei ^{[5
]}

Cai, Qianyu ^{[2
]}

Wang, Han ^{[1
,2
]}

Cui, Jialin ^{[6
]}

Chronopoulos, Dimitrios ^{[3
,4
]}

Hu, Peijun ^{[1
]}

机构：

[1] Zhejiang Univ, Sch Mech Engn, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310027, Peoples R China

[2] Zhejiang Univ, Sch Mech Engn, Key Lab Adv Mfg Technol Zhejiang Prov, Hangzhou, Peoples R China

[3] Katholieke Univ Leuven, Dept Mech Engn, Leuven, Belgium

[4] Katholieke Univ Leuven, Div Mechatron Syst Dynam LMSD, Leuven, Belgium

[5] Shanghai Inst Satellite Engn, Mech Technol Lab, Shanghai, Peoples R China

[6] Harbin Engn Univ, Coll Shipbldg Engn, Harbin, Peoples R China

来源：

POLYMER COMPOSITES | 2025年

关键词：

acoustic emission; laminated composite; repeated impact; time-frequency analysis; wavelet packed transform; WAVELET TRANSFORM; DAMAGE; DELAMINATION; CLASSIFICATION; FAILURE;

D O I：

10.1002/pc.29752

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

In the service of composite materials, scenarios involving repeated impacts are frequently encountered. In our study, the time-frequency characteristics of acoustic emission signals during repeated impact processes were investigated using wavelet packet transform. Principal Component Analysis was utilized to identify the frequency bands containing the most information. Shannon entropy was employed to select the optimal wavelet basis function. The terms DDD3, ADD3, and DAA3 correspond to matrix cracking, delamination, and fiber failure, respectively. The initial impact, due to the presence of numerous internal voids in the specimen, often leads to stress concentration, thus resulting in a prolonged duration of matrix cracking during the initial impact. Delamination becomes more active when matrix cracking initially occurs. Fiber failure typically accompanies unloading when it becomes active. Matrix cracking dissipates the most energy, followed by delamination and then fiber failure. When the final impact penetration occurs, the characteristic frequency band proportions for the quasi-isotropic matrix cracking, delamination, and fiber failure are 48.99%, 22.39%, and 7.16%, respectively. For the cross-ply laminate, the corresponding proportions of the characteristic frequency bands are 56.62%, 14.46%, and 6.98%, respectively.

引用

页数：14

共 33 条

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