ULTRASONIC CHARACTERIZATION AND QUANTITATIVE ANALYSIS FOR DELAMINATION IN RTM COMPOSITES

Abstract

Abstract: Regarding ZT7H/QY8911 carbon fiber reinforced resin matrix composites as research object, this paper prepared specimens using resin transfer molding processes (RTM) with simulated delamination by imbedding polytetrafluoroethylene (PTFE) film with different diameters (=3 mm, 6 mm, 10 mm) and different depth (near-upper-surface, mid-depth and near-lower-surface). Delamination was visually detected and quantitatively analyzed by ultrasonic A-Scan, B-Scan and C-Scan based on water-immersed ultrasonic pulse-echo reflection method. The result shows that the ultrasonic pulse-echo reflection method possesses qualitative and quantitative testing capacity for detecting delamination in RTM composite. The amplitude, phase and transit time of ultrasonic A-Scan signal have correlations with the size, depth and property of delamination. Ultrasonic B-Scan can characterize the defect depth as images with depth detection resolution up to one-ply thickness, while ultrasonic C-Scan can characterize the defect size as images with size detection deviation ≤1.0 mm.

Key words: RTM composite, ultrasonic nondestructive testing, pulse-echo reflection, ultrasonic A-Scan, ultrasonic B-Scan, ultrasonic C-Scan

CLC Number:

TB332

SHI Jun-wei, LIU Song-ping, LIU Fei-fei, YANG Yu-shen. ULTRASONIC CHARACTERIZATION AND QUANTITATIVE ANALYSIS FOR DELAMINATION IN RTM COMPOSITES[J]. Composites Science and Engineering, 2020, 0(6): 68-73.

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