Acoustic Emission Pattern Recognition on Tensile Damage Process of C/SiC Composites Using an Improved Genetic Algorithm

doi:10.15541/jim20190213

Abstract

Abstract:

The acoustic emission data collected during room temperature tensile test of 2D-C/SiC composites were analyzed by hierarchical clustering and unsupervised pattern recognition method based on an improved genetic algorithm. Combined with the SEM observation on the fracture surface, five damage modes were identified and their typical acoustic emission characteristics were obtained. According to the analysis of energy distribution, cumulative event number and cumulative energy of different damage modes, the damage evolution process of C/SiC composites can be divided into four stages. The first stage (damage initiation stage) shows mainly matrix microcracks and interface debonding. In the second stage, matrix crack reaches saturated and then causes a considerable quantity of interlaminar delamination and fiber failure. The third stage is a gradual damage development stage and all kinds of damage keep occurring except the breakage of fiber bundles. In the last stage, a large amount of fiber bundles break and the sample eventually fails.

Key words: C/SiC, acoustic emission, improved genetic algorithm, unsupervised clustering, damage

CLC Number:

TB332

ZHANG Yongzhen, TONG Xiaoyan, YAO Leijiang, LI Bin, BAI Guodong. Acoustic Emission Pattern Recognition on Tensile Damage Process of C/SiC Composites Using an Improved Genetic Algorithm[J]. Journal of Inorganic Materials, 2020, 35(5): 593-600.

Figures/Tables 11

Fig. 1 Schematic drawing of the tensile specimen

Fig. 2 Cluster analysis process based on the improved genetic algorithm

Fig. 3 Stress-strain curve and energy distribution of acoustic emission signal in tensile process

Fig. 4 Correlation dendrogram of the AE features

Fig. 5 CH&DB index change curves with K value of C/SiC specimen

Fig. 6 Distribution of clustering results of acoustic emission signals

Fig. 7 Fracture SEM images of specimen (a) Interlaminar delamination; (b) Fiber bundle breakage; (c) Fiber breakage & PyC interface failure; (d) Matrix cracking

Table 1 Numerical values of the clustering centers

Cluster	Count	Energy/ (mV·ms)	Amplitude/ mV	Average frequency/ kHz	Damage mode
1	182	28	63	112	Matrix cracking
2	596	90	71	136	Interface failure
3	303	42	66	189	Fiber breakage
4	1463	237	77	167	Interlaminar delamination
5	10703	1628	82	188	Fiber bundle breakage

Fig. 8 Accumulated energy with strain and time

Fig. 9 Accumulated number of AE events with strain and time

Fig. 10 Energy distributions of different damage modes during the tensile test (a) Matrix cracking; (b) Interface debonding; (c) Fiber breakage;(d) Interlaminar delamination; (e) Fiber bundle breakage

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