GFRP pipes are increasingly used all around the globe mainly because of its high corrosive resistance and light weight properties. GFRP are employed in the industries involving chemical processes, such as, water treatment, desalination and in petrochemical industries for handling oil & gas at offshore platforms. The studies on the reliability of the GFRP pipes and its defect occurring probabilities are widely performed, in which, pitting or wall loss defect is one of the severe defects which may produce in service stage and lead to leakage accidents. This paper explores the potential of lock-in results to quantification of pitting or wall loss defects in unidirectional filament wound GFRP curved composite materials. This work is focusing on quantification of defect depth through thermal diffusion and amplitude contrast methods. For defect sizing Full Width at Half Maximum method (FWHM) has been used. A detailed systematic investigation on defect depth and size quantification at various depths of the unidirectional GFRP curved sample is studied with the amplitude and phase images.

GFRP管的高耐腐蚀性和轻质特性使其在全球范围内得到越来越多的使用。GFRP用于涉及化学过程的行业，例如水处理，脱盐和石油化学行业，用于在海上平台上处理石油和天然气。GFRP管的可靠性及其缺陷发生概率的研究广泛，其中点蚀或壁损缺陷是服务阶段可能产生并导致泄漏事故的严重缺陷之一。本文探讨了锁定结果对单向缠绕玻璃纤维增​​强复合材料弯曲复合材料中点蚀或壁损缺陷定量化的潜力。这项工作的重点是通过热扩散和振幅对比方法对缺陷深度进行量化。为了确定缺陷大小，已使用半高全宽方法（FWHM）。利用振幅和相位图像，研究了对单向GFRP弯曲样品在不同深度处的缺陷深度和尺寸量化的详细系统研究。