Nondestructive Testing and Evaluation ( IF 2.6 ) Pub Date : 2021-02-23 , DOI: 10.1080/10589759.2021.1889549 Sanjaya K. Sahoo 1, 2 , Srinivas Kuchipudi 1 , R. Narasimha Rao 2 , Manoj K. Buragohain 1 , Ch. Sri Chaitanya 2
ABSTRACT
Polymer-based Glass composite cylindrical structures consisting of multi-layered configuration for special applications were tested with low magnetic field nuclear magnetic resonance (NMR) technique. Relaxation times of chemical species at the interface of adhesive bond were investigated. Studies indicated that the single-sided NMR inspection of such composite structures is a feasible non-destructive evaluation technique to study the adhesive bond interface properties. Results of single-sided inspection over cylindrical surface using low field NMR having magnetic field strength of 0.3 T (12.88 MHz RF frequency) indicated distinct signal intensity values for different constituent materials. Interfacial defects such as de-bond and voids were detectable through the multi-layers of the structure. Overlapping defects at multiple interfaces have no bearing on the signal as well as relaxation times of constituent materials.
中文翻译:
低场磁共振在多层圆柱复合结构缺陷检测中的应用
摘要
采用低磁场核磁共振 (NMR) 技术测试了由用于特殊应用的多层配置组成的聚合物基玻璃复合圆柱结构。研究了粘合剂界面处化学物质的弛豫时间。研究表明,这种复合结构的单面核磁共振检查是研究胶接界面性能的一种可行的无损评估技术。使用磁场强度为 0.3 T(12.88 MHz 射频频率)的低场核磁共振对圆柱表面进行单面检查的结果表明,不同成分材料的信号强度值不同。通过结构的多层可检测到诸如脱粘和空隙等界面缺陷。