Composites science and technology

An Introduction to Composite Materials: Fabrication

Low velocity impact response of fibre-metal laminates – A review

Structural health monitoring (SHM) is being widely evaluated by the aerospace industry as a method to improve the safety and reliability of aircraft structures and also reduce operational cost. Built-in sensor networks on an aircraft structure can provide crucial information regarding the condition, damage state and/or service environment of the structure. Among the various types of transducers used for SHM, piezoelectric materials are widely used because they can be employed as either actuators or sensors due to their piezoelectric effect and vice versa. This paper provides a brief overview of piezoelectric transducer-based SHM system technology developed for aircraft applications in the past two decades. The requirements for practical implementation and use of structural health monitoring systems in aircraft application are then introduced. State-of-the-art techniques for solving some practical issues, such as sensor network integration, scalability to large structures, reliability and effect of environmental conditions, robust damage detection and quantification are discussed. Development trend of SHM technology is also discussed.

Piezoelectric Transducer-Based Structural Health Monitoring for Aircraft Applications.

Acoustic source localization.

Acoustic source localization in anisotropic plates.

Low-velocity impact-induced damage in Ti/GFRP laminates as titanium-based Fibre-Metal Laminates (FMLs) was investigated to reveal the extent of internal damage in the in-plane direction and to evaluate the effects of titanium facesheets on impact damage in the GFRP core. It was found that interlaminar delamination in the GFRP layer expands widely due to crack initiation in the titanium layer on non-impacted side. However, matrix cracks and residual out-of-plane deformation are suppressed by energy absorption achieved by the bottom titanium layer. Furthermore, impact responses and damages obtained by finite element analysis with detailed modelling agree well with the experimental results. Thus, this study confirmed that the impact behaviour of the Ti/GFRP laminates is dominated by a fracture in the titanium layer on non-impacted side that fails in tension and that this layer plays a major role in preventing impact damages in the GFRP core.

Damage characterization of titanium/GFRP hybrid laminates subjected to low-velocity impact

The poly(butylene succinate) (PBS) biodegradable composites reinforced with jute fibers were developed. The effect of fiber content (10–60wt%) on the properties and water absorption of jute/PBS biodegradable composites was studied. The effect of alkali, silane, and combined alkali and silane surface treatment on the properties and water absorption of jute/PBS composites was investigated. The mechanical properties of surface treated jute/PBS composites were significantly higher than those of untreated ones. Compared with alkali or silane treatment, the combined alkali and silane surface treatment showed better mechanical properties of jute/PBS composites. The best mechanical properties of jute/PBS composites were achieved at 50wt% in this study, which showed an increase in tensile strength by 517.9%, tensile modulus by 3529.8%, flexural strength by 302.6%, and flexural modulus by 1949.1% compared with those of PBS resin. Fractured surface morphologies of composite specimens exhibited an improvement of inte...

Hayato Nakatani

Papers

Acoustic source localization in anisotropic plates.

Damage characterization of titanium/GFRP hybrid laminates subjected to low-velocity impact

Mechanical and thermal properties and water absorption of jute fiber reinforced poly(butylene succinate) biodegradable composites

A two-step hybrid technique for accurately localizing acoustic source in anisotropic structures without knowing their material properties.

Improving accuracy of acoustic source localization in anisotropic plates.