TY JOUR TI Actual Technologies and Instruments for Polymer Composite Materials Testing with Through Transmission Ultrasonic Technique KW manual through transmission ultrasound technique KW sandwich construction KW bonded construction KW polymer composite material KW acoustic contact JO NDT World AU Generalov, A.S. AU Trifonova, S.. AU Dalin, M.. PY 2016 IS 19 PB LLC SVEN