作者：刘然¹, 周伟¹, 李亚娟¹, 包正宇², 陈维业¹, 李晓彤¹

作者单位：1. 河北大学质量技术监督学院, 河北 保定 071002;
2. 天津水泥工业设计研究院有限公司, 天津 300400

关键词：风电叶片;复合材料;柱壳;拉伸实验;声发射监测

摘要：

为研究胶接长度对风电叶片柱壳胶接接头力学性能及声发射响应特征的影响,对金属/玻璃钢柱壳试件的拉伸实验全过程进行声发射监测。结果表明:柱壳试件拉伸过程基本为线性破坏,胶接接头的失效模式为界面破坏,损伤多发生在胶层边缘应力集中处。加大胶接长度,能有效增强金属/玻璃钢柱壳试件的胶接强度。较大的胶接长度对应的声发射信号幅度高、相对能量高、撞击累积数多。因此,在风电叶片复合材料叶根部位的安全评估时,可将声发射信号的动态变化特征作为评判依据。

Acoustic emission monitoring for adhesive joints of Metal/FRP cylinder-shell under tensile test

LIU Ran¹, ZHOU Wei¹, LI Yajuan¹, BAO Zhengyu², CHEN Weiye¹, Li Xiaotong¹

1. College of Quality and Technology Supervision, Hebei University, Baoding 071002, China;
2. Tianjin Cement Industry Design & Research Institute Co., Ltd., Tianjin 300400, China

Abstract: In order to study influences that different lengths affect mechanical properties and acoustic emission (AE) responding characteristics of adhesive joints of wind turbine blade Metal/FRP cylinder-shell, the whole progresses of tensile tests were monitored by AE. The results show that the load-time curve of cylinder-shell specimens is basically linear and the failure mode is the interfacial failure, and the damage evolutions are mostly occurred in the edge of the adhesive layer. Increasing the length can effectively improve the bonding strength of Metal/FRP cylinder-shell specimens. Higher AE amplitude, relative energy and more cumulative hits are connected with the damage process of specimens with longer length. Therefore, dynamic characteristics of AE signals can provide evidences for security evaluation of wind turbine blades composite roots.

Keywords: wind turbine blade;composite material;cylinder-shell;tensile test;acoustic emission monitor

2015, 41(9): 125-128  收稿日期: 2014-11-21;收到修改稿日期: 2015-1-19

基金项目: 河北省自然科学基金项目(E2012201084);河北大学大学生创新创业训练项目(2014074)

作者简介: 刘然(1990-),男,河北唐山市人,硕士研究生,专业方向为复合材料声发射检测研究。

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