Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (11): 81-87.doi: 10.13475/j.fzxb.20180607507

• Textile Engineering • Previous Articles     Next Articles

Internal defect detection method for thin test pieces of woven laminated composites based on ultrasonic phased array

XIAO Zhitao1, GUO Yongmin2, GENG Lei1(), WU Jun1, ZHANG Fang1, WANG Wen1, LIU Yanbei1   

  1. 1. College of Electronics and Information Engineering, Tiangong University, Tianjin 300387, China
    2. School of Mechanical Engineering, Tiangong University, Tianjin 300387, China
  • Received:2018-06-25 Revised:2019-08-04 Online:2019-11-15 Published:2019-11-26
  • Contact: GENG Lei E-mail:genglei@tjpu.edu.cn

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Abstract:

As defects may exist in the test pieces of woven laminated composites, the method of ultrasonic array test is used to carry out 100% ultrasonic scanning of woven laminated composite and the defect areas obtained by ultrasonic positioning were analyzed. The corresponding relation of the ultrasonic echo A flicking waveform, B and C scan images and the internal defects distribution of woven laminated composites were researched. The results of ultrasonic testing for the composite inspiring 4,8,16 elements at the same time and the scanning ultrasonic testing results for the thin braided composites in the horizontal and vertical direction under the optimal condition were compared. A simple quantitative analysis of C scan image of the defects was conducted. Experimental results show that there is a one-to-one corresponding relationship on the defect display of woven laminated composites between the ultrasonic A scan echo, B and C scan images. The ultrasonic phased array detection method can be used to evaluate the nondestructive testing and defects of woven laminated composites.

Key words: woven laminated composites, defect detection, ultrasonic phased array detection, ultrasonic echo, non-destructive testing

CLC Number: 

  • TS101.8

Fig.1

Experimental figures. (a) Encoder;(b) Probe and matching straight wedge; (c) Experimental platform; (d) Horizontal scanning; (e) Vertical scanning; (f) Thin specimen"

Tab.1

Parameter setting of ultrasonic phased array"

名称 参数 名称 参数
材料声速 2 330.0 m/s 声波类型 纵波
法则配置 0°线性 扫查方式 扫查器扫查
聚焦深度 2 mm 成像显示 A-B、A-C
第一晶片 1个 扫查速度 30.0 mm/s
最后晶片 64个 编码器分辨率 13步距/mm
晶片步距 1

Fig.2

0°beam sound field diagram. (a) 4 elements; (b) 8 elements; (c) 16 elements"

Fig.3

Scanning figures by firing 4 elements at the same time. (a) A-scan; (b) B-scan; (c) C-scan"

Fig.4

Scanning figures by firing 8 elements at the same time. (a) A-scan; (b) B-scan; (c) C-scan"

Fig.5

Scanning figures by firing 16 elements at the same time. (a) A-scan; (b) B-scan; (c) C-scan"

Fig.6

Scanning figures at horizontal and vertical direction. (a) Tomoview (horizontal scanning); (b) Tomoview (vertical scanning); (c) Horizontal scanning of same position (A-C-S); (d) Vertical scanning of same position (A-C-S)"

Fig.7

C-scan(a)and B-scan(b)diagram by scanning of composite material"

Fig.8

Corresponding waveform diagram of defects 1(a), 2(b) and 3(c)"

Fig.9

Figure of defect 3"

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