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论文类型：期刊论文

发表时间：2018-07-01

发表刊物：NDT & E INTERNATIONAL

收录刊物：SCIE、EI

卷号：97

页面范围：51-58

ISSN号：0963-8695

关键字：Carbon fiber reinforced plastics; Layered anisotropy; Total focusing method; Ultrasonic travel time

摘要：Precise knowledge of ultrasonic travel time in carbon fiber reinforced plastics (CFRP) is difficult to obtain due to the layered anisotropic nature. This paper proposes a model-based method to calculate the travel time of qP wave in CFRP laminates. The aim is to correct the time delays of total focusing method (TFM) applied to post-process the full matrix capture data for enhanced ultrasonic imaging. Experiments show that a 4.84 mm delamination is accurately sized by corrected TFM. The associated detection sensitivity is 46.0 dB and 3.6 dB above those of paintbrush acquisition and basic TFM, respectively.