Acoustic characteristics and ultrasonic testing of multiple heterogeneous GFRP material
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摘要: 针对超导磁体绝缘层用玻璃纤维增强树脂基(GFRP)复合材料的无损检测难题,开展了材料声学特性表征及缺陷超声检测试验。对厚度为1.21～4.39mm的层板以及带有实际缺陷的绝缘层试块进行超声检测,结合金相检验分析了绝缘层试块缺陷检测结果,讨论了材料多相非均质性对缺陷检测的影响。试验结果表明,层板试样的声速为2698.75～3256.41m·s-1,时域衰减系数为5.03～12.58dB·mm-1,超声信号中能观察到层间反射。对于厚度为1.21mm和3.32mm的层板,超声法可检出ϕ5.0,ϕ3.0,ϕ1.0mm的人工缺陷,对于厚度为4.39mm的层板,可识别ϕ5.0,ϕ3.0mm的人工缺陷。该结果可为GFRP材料的超声检测提供一定参考。Abstract: In order to solve the problem of nondestructive tesing of glass fiber reinforced plastics (GFRP) composites for superconducting magnet insulation, this paper studies the acoustic properties of GFRP and carries out ultrasonic testing experiments. Ultrasonic detection of laminates with thickness of 1. 21-4. 39 mm and insulating layer test blocks with actual defects are carried out. Combined with metallographic observation, the defect detection results of insulation layer test blocks are analysed, and the influence of material multiphase heterogeneity on defect detection is discussed. The test result shows that the sound velocity of the laminate sample is between 2 698. 75-3 256. 41m ·s-1, and the time domain attenuation coefficient is between 5. 03-12. 58 dB ·mm-1, and the interlayer reflection can be observed in the ultrasonic signal. For 1. 21 and 3. 32 mm thick laminates, artificial defects of ϕ 5. 0, ϕ 3. 0 and ϕ 1. 0 mm can be detected, for 4. 39 mm thick laminate, only artificial defects of ϕ 5. 0 and ϕ 3. 0 mm can be detected,which provide some reference for ultrasonic detection of GFRP materials.
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Keywords:
- glass fiber reinforced plastic /
- ultrasonic testing /
- heterogeneity /
- defect
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[1] 熊秋月,刘志宏,陈文革,等.超导磁体绝缘用玻璃纤维真空热处理前后性能研究[J].真空科学与技术学报,2021,41(8):756-760. [2] HUMER K,BITTNER-ROHRHOFER K,FILLUNGER H,et al.Innovative insulation systems for superconducting fusion magnets[J].Superconductor Science and Technology,2006,19(3):96-101.
[3] 邢银龙,刘志宏,吴杰峰,等.ITER超导磁体绝缘玻璃纤维放气性能分析[J].真空,2017,54(5):52-55. [4] 王焰,张炜,杨正伟,等.玻璃纤维复合材料分层缺陷的红外热波检测[J].无损检测,2010,32(11):880-883. [5] 王宝定,吴俊伟,廖为圣,等.玻璃钢缺陷的空耦激光超声检测[J].无损检测,2022,44(6):26-31. [6] 李晓红,赵洲峰,高亮,等.换流阀阀塔玻璃钢拉杆的超声检测[J].武汉大学学报(工学版),2010,43(6):766-769. [7] 王浩全,曾光宇.玻璃纤维复合材料超声C扫描检测研究[J].兵工学报,2005,26(4):570-572. [8] 凡丽梅,王从科,赵付宝,等.玻璃纤维增强树脂基复合材料内部缺陷的超声成像检测[J].无损探伤,2014,38(3):25-27. [9] ZHANG Z,GUO S F,LI Q,et al.Ultrasonic detection and characterization of delamination and rich resin in thick composites with waviness[J].Composites Science and Technology,2020,189:108016.
[10] ONO K.A comprehensive report on ultrasonic attenuation of engineering materials,including metals,ceramics,polymers,fiber-reinforced composites,wood,and rocks[J].Applied Sciences,2020,10(7):2230.
[11] 陆铭慧,刘磨,张雪松,等.RTM玻璃纤维/E51环氧树脂复合材料孔隙含量对超声特征参数的影响[J].复合材料学报,2018,35(2):291-297. [12] 董珍一.基于机器学习的封严涂层组成相分布均匀性超声定量表征[D].大连:大连理工大学,2021.
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