Polymer composites is a typical material consisting of a matrix reinforced with fiber/filler and the general nature of construction of the material itself provides innumerable sites for the initiation of a defect or for the growth of delamination. The life expectancy of composite structure requires a clear understanding of the material’s response to the growth of interlaminar delamination under Mode I, Mode II, Mode III and Mixed Modes. Fracture testing of fiber reinforced polymer-matrix composites is an active area of research. Even though substantial progress in the area of fracture testing has been achieved, there are still several problems awaiting solution. The new aspects in the experimental studies of interlaminar and intralaminar fracture toughness of polymer matrix composites were emphasized in this review paper. The different modes to evaluate the fracture energy were listed and their suitability was mentioned.

/pdf/experimental-methods-of-determining-fracture-toughness-of-3ksfs91m4y.pdf

Experimental Methods of Determining Fracture Toughness of Fiber Reinforced Polymer Composites under Various Loading Conditions

In this work, a predictive model of attenuated guided wave propagation in carbon fiber–reinforced polymer using Rayleigh damping is developed. After a brief introduction, this article reviews the theory of guided waves in anisotropic composite materials. It follows with a discussion of the piezoelectric wafer active sensors, which are lightweight and inexpensive transducers for structural health monitoring applications. Experiments were performed on a carbon fiber–reinforced polymer panel to measure the dispersion curves and the piezoelectric wafer active sensors tuning curves. Lamb wave damping coefficient was modeled using the multi-physics finite element method and compared with experimental results. A discussion about the capability to simulate, with multi-physics finite element method commercial software, guided wave in composite material using the Rayleigh damping is developed. This article ends with conclusion, and suggestions for further work are also presented.

Prediction of attenuated guided waves propagation in carbon fiber composites using Rayleigh damping model

https://imechanica.org/files/Yan-Oskay-Krishnan-Xu-2010.pdf

Compression-after-impact response of woven fiber-reinforced composites

Structural health monitoring of marine composite structural joints using embedded fiber Bragg grating strain sensors

This article reviews the principles and application of optical fiber Bragg gratings (FBGs) as strain and temperature sensors for structural health monitoring applications. FBG sensors have many advantages for strain sensing in such applications including their small size, the potential to multiplex hundreds of sensors with a single ingress/egress fiber, their immunity to electromagnetic interference, and their corrosion resistance. The spectral properties of FBGs and their response to applied strain and temperature fields are derived. Multiplexing and interrogation strategies for large sensor networks are presented. Special focus is placed on the response of FBGs to multiaxis strain fields and rapidly varying strain fields such as near the location of structural damage. Common approaches to invert the spectral response of an FBG subjected to a complex strain field are also reviewed. Finally, this article reviews common fabrication techniques for FBGs and their relative impacts on the strength of these sensors.


Keywords:

optical fiber sensor;
fiber Bragg grating;
long period grating;
wavelength division multiplexing;
multiaxis sensor

Fiber Bragg Grating Sensors

Damage assessment and monitoring of composite ship joints

Applicability of the crack tip element analysis for damage prediction of composite T-joints

For a monocoque hull structure, the bulkhead is used to separate the hull into many compartments. A typical joint between the hull and bulkhead used in such structure is known as a T-joint. It consists of composite overlaminates over a shaped fillet to allow the transmission of direct and membrane shear stresses. This paper describes the numerical solutions of the analytical approach in studying of the effect of disbond for a composite ship T-Joint using two methods, the VCCT (Virtual Crack Closure Technique) and CTE (Crack Tip Element) method. The analysis was conducted for T-Joints with various disbond sizes. It was subjected to a straight pull-off load to simulate normal operational conditions. An experimental investigation was conducted to validate the FE (Finite Element) models. The results of the numerical and experimental studies are discussed to corroborate the effectiveness of using fracture mechanics for this analysing this structure. A modified CTE model for the T-joint is proposed to enable a like-for-like comparison to that evaluated by the VCCT method.

Damage Prediction Models for Composite T-joints in Marine Applications

Fracture behaviour of composite maritime T-joints

Mixed mode fracture toughness of GFRP composites

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