用贴片散斑法测量复合材料方形薄壁梁弯曲变形

STRAIN DETERMINATION IN A CARBON FIBER COMPOSITE BEAM BY OBJECTIVE SPECKLE OF STICKLING FOIL

1.
Institute of Mechanics, Chinese Academy of Scinces, Beijing, China;
2.
Department of Elight Vehicle Design and Applied Mechanics Beijing Institute of Aeronautics and Astronautics Beijing 100083, China

摘要

摘要: 本文用贴片散斑法, 对碳纤维复合材料方形薄璧梁的弯曲变形进行测量, 实验在脱离了暗室和防震台的现场进行。两次曝光后的散斑底片经三个方向滤波后得到三组不同方向的全场等位移线, 揭示了各向异性材料梁的变形规律和应变分布的全貌, 由此测得的应变值与工程梁理论计算结果相符, 也与电测结果相符。

Abstract: In this paper a new metkod referred to as objective speckle of sticking foil. has been employed in order to deterrizine strain distribution in a carbon fiber composite box beam.The specimen surface was treated by relative easy techniques.Three fullfield contour maps are obtained with clear lines of equal displacemet in 0°, 90°, and 45° directions, respectively.The experiment was carried out in an ordinary labor atory without a dark room or a vibration isolation bench.The results are agreed well with those by calculation according to the theory of engineering bea ms and by measuring of electrical-resistance strain gages.