Real-Time Magneto-Optic Nondestructive Inspection of Tagged Composite Materials

这个小型企业创新研究第一阶段项目将展示一种新的、先进的、快速的无损检测技术，用于复合材料的制造和在役检测。复合材料正迅速成为各种传统金属结构部件的坚固、轻便的替代品。然而，由于复合材料的高电阻率和/或高超声衰减，通常很难检测其是否存在不连续或冲击损伤。建议在制造过程中在粘结基质中使用微量的磁粉标记复合材料，和/或在纤维层之间使用铁磁性或导电金属丝网--这种屏蔽物已经普遍用于现有的航空航天复合材料，用于除冰加热器和防雷。还建议使用电非接触式磁光/涡流成像系统MOI来形成故意引入这些材料的空洞和冲击损伤的快速扫描实时图像。通过适当选择标记材料、复合样品和涉及MOI和SQUID磁强计的受控实验，物理研究公司将证明快速成像和检测其他隐藏的不连续和撞击损伤的可行性。

This Small Business Innovation Research Phase I project will demonstrate a new, advanced, rapid nondestructive inspection technique for use on composite materials during manufacturing and in-service inspection. Composite materials are rapidly becoming strong, lightweight substitutes for a great variety of traditional metallic structural components. However, composites are often difficult to inspect for discontinuities or impact damage due to their high electrical resistivity and/or high ultrasonic attenuation. It is proposed that composites be tagged during manufacturing with trace quantities of magnetic powders in the binding matrix and/or with ferromagnetic or electrically conducting wire screens among the fiber layers - such screens are already commonly employed in existing aerospace composites for deicing heaters and lightning protection. It is further proposed that an electrically noncontacting magneto-optic/eddy current imaging system, the MOI, then be used to form rapidly scanned, real-time images of voids and impact damage deliberately introduced into these materials. With an appropriate choice of tagging materials, composite samples and controlled experiments involving the MOI and SQUID magnetometers, Physical Research, Inc., will demonstrate the feasibility of rapidly imaging and detecting otherwise hidden discontinuities and impact damage.