ACOUSTIC EMMISION BEHAVIOR FOR ADHESIVE JOINTS OF METAL/GFRP CYLINDER-SHELL UNDER TORSION TEST

Abstract

Abstract: Acoustic emission (AE) testing technology was used to monitor the process of damage and failure of metal/GFRP cylinder-shell specimen under torsion test in real time. By experiment and numerical simulation, the effect of sizes of bolt and shell on torsional properties of adhesive joint of metal/GFRP cylinder-shell specimen and corresponding AE characteristics were studied. The results show that the load-time curve of cylinder-shell specimen is basically linear. It is found that cohesive failure is the dominant failure mode with fiber break and matrix crack. Increasing the diameter of bolt can effectively improve the torsional properties of metal/GFRP cylinder-shell. Besides, AE parameters are related to the damage and failure process. Higher AE amplitude, relative energy, during time and more cumulative hits are connected with the damage process of specimen with longer bolt diameter. Therefore, dynamic characteristics of AE signals can provide evidences for security evaluation of wind turbine blades roots.

Key words: wind turbine blade, cylinder-shell, torsion, acoustic emission

CLC Number:

TB332

PANG Yan-rong, LIU Ran, ZHOU Wei, GONG Jing. ACOUSTIC EMMISION BEHAVIOR FOR ADHESIVE JOINTS OF METAL/GFRP CYLINDER-SHELL UNDER TORSION TEST[J]. COMPOSITES SCIENCE AND ENGINEERING, 2015, 0(5): 33-37.

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