Non-destructive testing on aramid fibres for the long-term assessment of interventions on heritage structures

11th International Conference on Damage Assessment of Structures

物理学;材料科学

Ceravolo, R.^1 ; De Marchi, A.^2 ; Pinotti, E.^1 ; Surace, C.^1 ; Fragonara, L. Zanotti^1

Politecnico di Torino, Department of Structural, Building and Geotechnical Engineering, Corso Duca degli Abruzzi 24, Turin

10129, Italy^1

Politecnico di Torino, Department of Electronic and Telecommunications, Corso Duca degli Abruzzi 24, Turin

10129, Italy^2

关键词: Fibre reinforced polymers;    Heritage buildings;    Heritage structures;    High-precision measurement;    Long term behaviours;    Non destructive testing;    Nonlinearity tests;    Structural repairs;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/628/1/012102/pdf
DOI  :  10.1088/1742-6596/628/1/012102

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

High strength fibre reinforced polymers (FRPs) are composite materials made of fibres such as carbon, aramid and/or glass, and a resin matrix. FRPs are commonly used for structural repair and strengthening interventions and exhibit high potential for applications to existing constructions, including heritage buildings. In regard to aramid fibres, uncertainties about the long-term behaviour of these materials have often made the designers reluctant to use them in structural engineering. The present study describes simple and non-destructive nonlinearity tests for assessing damage or degradation of structural properties in Kevlar fibres. This was obtained by using high precision measurements to detect small deviations in the dynamic response measured on fibres and ropes. The change in dynamic properties was then related to a damage produced by exposure of the sample to UV rays for a defined time period, which simulated long-term sun exposure. In order to investigate the sensitivity of such an approach to damage detection, non-linearity characterisation tests were conducted on aramid fibres in both damaged and undamaged states. With the purpose of carrying out dynamic tests on small fibre specimens, a dedicated instrumentation was designed and built in cooperation with the Metrology Laboratory of the Department of Electronics at the Politecnico di Torino.