Numerical simulation study on ultrasonic testing for fatigue damage characteristics of CFRP laminates based on Micro-CT

IF 4.1 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Ndt & E International Pub Date : 2025-06-09 DOI:10.1016/j.ndteint.2025.103466

Tianyu Zheng , Zhiming Liu , Yi Yin , Qingxin Gao , Tianhe Jin , Yiliang Shu

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Abstract

Ultrasonic testing is highly sensitive to defects such as porosity and delamination in carbon fiber reinforced composite (CFRP) laminates, making it the most suitable non-destructive evaluation method for monitoring CFRP fatigue damage in engineering. In this study, based on finite element analysis, the influence of the spatial distribution characteristics of fatigue damages within [90/0]_2S orthotropic CFRP laminates under different loading cycles on ultrasonic responses were investigated. Firstly, the damage information inside the fatigue specimens were obtained using Micro-CT and the fatigue damage evolution characteristics were analyzed: pores within the fatigue specimens were significantly concentrated in the inter-laminar regions, while the intra-laminar porosity level was low. Secondly, a Stochastic Void Concentration Model (SVCM) characterizing the concentrated distribution of damage within the specimen was developed, and the conventional Random Void Model (RVM) was used for comparison. Further, the influence of the fatigue-induced damage distribution characteristics on ultrasonic responses were obtained by FEA: Compared to the RVM, the cyclic-like distribution of the SVCM pores strongly perturbed the echoed ultrasonic backscattered signals, which led to a significant increase of energy in the frequency bands around 10 MHz, 16 MHz and 21 MHz; the apparent integral backscattering coefficient AIB_LS proposed in this paper is linearly and positively correlated with the porosity of SVCM at different fatigue stages, allowing it to be used for internal fatigue damage analysis of laminates.

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基于Micro-CT的CFRP复合材料疲劳损伤超声检测数值模拟研究

超声检测对碳纤维增强复合材料（CFRP）层合板的气孔、分层等缺陷具有较高的敏感性，是工程中监测CFRP疲劳损伤的最合适的无损评价方法。本研究基于有限元分析，研究了不同加载周期下[90/0]2S正交异性CFRP层合板疲劳损伤空间分布特征对超声响应的影响。首先，利用Micro-CT获取疲劳试样内部损伤信息，分析疲劳损伤演化特征：疲劳试样内部孔隙明显集中在层间区域，而层内孔隙度水平较低；其次，建立了表征试件内部损伤集中分布的随机空洞浓度模型（SVCM），并与常规随机空洞模型（RVM）进行了比较。通过有限元分析得到了疲劳损伤分布特征对超声响应的影响：与RVM相比，SVCM孔的环状分布对回波超声后向散射信号产生了强烈的扰动，导致10 MHz、16 MHz和21 MHz附近频段的能量显著增加；本文提出的视积分后向散射系数AIBLS与SVCM在不同疲劳阶段的孔隙率呈线性正相关，可用于层合板的内部疲劳损伤分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.