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首页> 外文会议>3rd International Workshop on Structural Health Monitoring, Sep 12-14, 2001, Stanford University >Delamination on Impacted Natural Fibers Composite Materials by Means of a New Ultrasonic Method
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Delamination on Impacted Natural Fibers Composite Materials by Means of a New Ultrasonic Method

机译：新型超声方法对受影响的天然纤维复合材料进行分层

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摘要

The purpose of the present paper is to describe the effectiveness of an ultrasonic N.D.T. system in form of reflection (pulse-echo) for the detection of delaminations on composite laminates. For this study very low-cost composite materials has been considered such as Jute based systems, that have been subjected to transversal impact loads at low-velocity. The specimens were subjected to impact tests at several impact energy levels, to obtain an internal damage mostly in form of delaminated areas. All the specimens were subjected to N.D.T. ultrasonic inspections before the impact, in order to evaluate the delaminations produced by the poor fabrication process (molding by vacuum bag) and after the impact, in order to evaluate the extention of the damage and it's localization along the thickness. For the purpose a new technique, described with details on this paper, has been pointed out by the authors for such laminates. Owing the high attenuation of the materials, the DAC electronic function (software) and a 5 MHz frequence probe have been utilized.
机译：本文的目的是描述超声波N.D.T.反射形式的系统（脉冲回波），用于检测复合材料层压板上的分层。对于本研究，已经考虑了非常廉价的复合材料，例如基于黄麻的系统，这些材料在低速下承受了横向冲击载荷。样品在几种冲击能级下进行了冲击试验，以获得内部损坏，大部分为分层区域。所有样本均经过N.D.T.冲击之前进行超声波检查，以评估不良的制造工艺（通过真空袋成型）和冲击之后产生的分层，以评估损伤的程度及其沿厚度的定位。为了这个目的，作者针对这种层压板指出了一种在本文中详细描述的新技术。由于材料的高衰减，已使用了DAC电子功能（软件）和5 MHz频率探头。

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