Survey of Tracing and Sensing Systems for the Detailed Study of Fibrous Materials under Tensile-Impact Loading

摘要

A survey was made of prospective tracing and sensing systems which might be applicable to investigations of component and structural deformations within fibrous materials in response to impact tensioning. The candidate systems were generally characterized and compared as to basic suitability and probable adaptability to studies of fabrics, cords, and webbings with 20 - 40% extensibility and under extension rates up to 10,000% per second. Among the more favorably considered were those using magnetic tapes, optical trackers, capacitance transducers, magnetic proximity devices, direct multiflash and high-speed photography, and photography of moire pattern fringes, color of liquid crystals, and radiation and infrared images. Most other systems appeared either inherently, or in their present stages of development, to less well satisfy criteria of reliability, clarity of interpretation, low inertial loading, low restraint on the material, rapid response, and facility for simultaneous sensing of several key deformational factors. Specific recommendations are made for obtaining different evidences and perspectives of events leading up to rupture of the fibrous materials, e.g., optical mapping (high-speed framing photography), thermal mapping (dynamic infrared imaging), shear-rate mapping (dynamic imaging of colored liquid-crystal line coatings), and sound mapping (dynamic 2-dimensional acoustical analysis). (Author)