Technical Diagnostics and Non-Destructive Testing, 2024, №04

2024 №04 (01)

DOI of Article 10.37434/tdnk2024.04.02

2024 №04 (03)

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"Tekhnichna Diahnostyka ta Neruinivnyi Kontrol" (Technical Diagnostics and Non-Destructive Testing) #4, 2024, pp. 13-17

Evaluation of the mechanical characteristics of CFRP composites and modeling of the delamination phenomenon

A. Savin^1,2, R. Steigmann¹, M.D. Stanciu², C.I. Moraras³, G. Dobrescu¹

¹Nondestructive testing Department, National Institute of R&D for Technical Physics, Iasi, Romania. E-mail: asavin@phys-iasi.ro
²Faculty of Mechanical Engineering, Transilvania University of Brașov, Romania
³Faculty of Mechanical Engineering, Technical University Gh. Asachi Iasi, Romania

In the category of new and advanced materials, carbon fiber reinforced plastic (CFRP) composite materials are used in areas such as structural materials in aeronautics, transport, etc. The bi-phasic structure of CFRP requires knowledge of both fiber and matrix properties. In the conditions where possible delamination’s occur during use, these depend both on the properties of the interfaces and of the interlaminate. The appropriate ultrasound (US) techniques allow the determination of the propagation speed of the longitudinal and transverse waves which are used in the evaluation of the elastic modulus E, shear modulus G on the three principal directions. C-scan US using phased array allows the emphasizing and characterization of ones with porosities that appear during composite fabrication or due to local overheating. The results are compared with those obtained by a dynamic mechanical analyzer (DMA), being found a good correlation. These procedures allow also the emphasizing of matrix damages due to high temperature used or establishing maximum temperature for used. 16 Ref., 1 Tabl., 6 Fig.
Keywords: carbon fiber reinforced plastic, nondestructive testing, ultrasound, dynamic mechanical analyzer

Received: 31.10.2024
Received in revised form:12.11.2024
Accepted: 20.12.2024

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