Numerical Analysis of the Effect of Microscale Components Interaction on Measurements of Fiber Optic Strain Sensors Used in Composite Structures

Tashkinov, Mikhail; Шардаков, И. Н.

doi:10.1155/2019/1714608

Cited by 2 publications

(1 citation statement)

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“…Wood et al (2000) have shown very good agreement between strain gauge and embedded FBG for unidirectional composite laminates except for high load values, which they have assumed to be due to compression of grips applied on specimen and fiber. Numerical and experimental approach was used in (Tashkinov and Shardakov, 2019) to show that the FBG measurements can be influenced by surrounding medium. Other than contact-based methods, non-contact devices of strain measurement have been used in recent years since they do not interfere in mechanical response of material.…”

Section: Introductionmentioning

confidence: 99%

Damage growth and failure detection in hybrid fiber composites using experimental in-situ optical strain measurements and smoothing element analysis

Tabrizi

Kefal

Zanjani

et al. 2021

International Journal of Damage Mechanics

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In previous study the failure initiation and development in hybrid fiber laminates was successfully monitored and determined. In current investigation a novel damage monitoring approach is proposed for hybrid laminates by combining different optical strain measurement techniques namely digital image correlation (DIC), fiber Bragg grating sensors (FBG) and infrared thermography (IRT) with smoothing element analysis (SEA). This viable experimental procedure eliminates the effects of global/local nature of optical strain measurement systems on heterogeneous damage accumulation and is a two-step approach. First, all optical sensing systems together with conventional strain gauges are utilized concurrently to indicate the differences in the measured strains and monitor damage accumulation under tensile loading. This demonstrates how failure events disturb the measurement capabilities of optical systems, which can cause a miscalculation of hybrid effect in hybrid-fiber laminates. The second step involves the utilization of SEA algorithm for discretely measured DIC displacements to predict a realistic continuous displacement/strain map and rigorously mitigate the inherent noise of the full field optical system. Remarkably, for large deformation states in hybrid composites, the combination of SEA/DIC enables early prediction of susceptible damage zones at stress levels 30% below material strength.

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Section: Introductionmentioning

confidence: 99%