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Chun-Hui Wang

Chun-Hui Wang
UNSW Sydney | UNSW · School of Mechanical and Manufacturing Engineering

PhD

About

493
Publications
132,827
Reads
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11,382
Citations
Additional affiliations
April 2009 - December 2015
RMIT University
Position
  • Managing Director
April 1995 - April 2009
Defence Science and Technology Organisation
Position
  • Head of Advanced Composites Technology
January 1994 - April 1995
Deakin University
Position
  • Lecturer

Publications

Publications (493)
Article
Through-thickness reinforcements are an effective technique to improve the structural properties of bonded fibre-polymer composite lap joints. This study examines the strengthening effects of z-pins on different types of composite lap joints. Co-cured single, quadruple and multi-step lap joints made of carbon-epoxy laminate were reinforced with ste...
Article
Full-text available
The selection of biomaterials as biomedical implants is a significant challenge. Ultra-high molecular weight polyethylene (UHMWPE) and composites of such kind have been extensively used in medical implants, notably in the bearings of the hip, knee, and other joint prostheses, owing to its biocompatibility and high wear resistance. For the Anterior...
Article
Current stretchable strain sensors possess limited linear working ranges and it is still a formidable challenge to develop sensors that concurrently possess high gauge factors and high stretchability (ε ~ 100%). Herein, we report a facile method for creating unidirectional strain sensors to address the above issues. Using the 3D printing technique,...
Article
This work presents a new approach for hybridizing nano-scale materials to create Schottky junctions for regulating the dynamic movement of triboelectric charges in the friction layer and enhancing the electrical output of flexible triboelectric nanogenerators (TENGs). The electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) compo...
Article
Direct-current triboelectric nanogenerators (DC-TENGs) can directly convert mechanical energy to DC power without any rectifier and hence hold great potential as a lightweight and wearable energy harvesting technology. However, most of the recently reported DC-TENGs required metal frictional electrodes (FE-DC-TENGs) to achieve unidirectional charge...
Article
Two methods used to construct a microstructural representative volume element (RVE) were evaluated for their accuracy when used in a crystal plasticity-based finite element (CP-FE) model. The RVE-based CP-FE model has been shown to accurately predict the complete tensile stress–strain response of a Ti–6Al–4V alloy manufactured by laser powder bed f...
Article
Full-text available
The performance of polymer surface treatment using plasma immersion ion implantation (PIII) depends on many operating parameters, such as treatment duration, radiofrequency power, pulsed bias voltage and pulse repetition rate, and the ion fluence applied on the polymer surface. Currently, the identification of optimal operating parameters to achiev...
Article
Full-text available
Global climate change and anthropological activities have led to a decline in insect pollinators worldwide. Agricultural globalisation and intensification have also removed crops from their natural insect pollinators, and sparked research to identify alternate natural insect pollinators and artificial technologies. In certain countries such as Aust...
Article
This paper presents an experimental investigation of the hierarchical strengthening of composite T-shaped bonded joints using dual-length-scale reinforcements: carbon nanomaterials and carbon z-pins. The nanomaterials were carbon nanotubes (CNTs), carbon nanofibres (CNFs) and graphene nanoplatelets (GNPs), and were ∼10 nm – 200 μm in size whereas t...
Article
Flexible triboelectric nanogenerators (TENGs) are sustainable energy sources to power a diverse range of intelligent sensing and monitoring devices and poly(vinylidene fluoride) (PVDF) is a common polymer incorporated in TENGs. To further enhance the electrical outputs of PVDF based TENGs, herein we present a technique for introducing liquid metal...
Article
A multiscale finite element model integrating microstructure statistics with an enhanced three-dimensional (3D) crystal plasticity model including damage has been developed to predict the complete tensile stress-strain response of Ti-6Al-4V manufactured by selective laser melting. A statistically equivalent representative volume element (SERVE) was...
Article
Wearable sensors are emerging as a new technology to detect physiological and biochemical markers for remote health monitoring. By measuring vital signs such as respiratory rate, body temperature, and blood oxygen level, wearable sensors offer tremendous potential for the noninvasive and early diagnosis of numerous diseases such as Covid-19. Over t...
Article
Rapid and contactless on-demand debonding and rebonding with high strength is a promising solution for quick attachment, repairs, disassembly, and recycling of structural systems. Rapid and contactless on-demand debonding and rebonding with high strength can be achieved through incorporating ferrimagnetic iron oxide nanoparticles (Fe3O4) into poly(...
Article
This paper presents an experimental investigation into improvements to the interlaminar fracture toughness, low-velocity impact damage resistance and compression-after-impact (CAI) strength of continuous carbon fibre-epoxy composite laminates toughened with multi-scale carbon nano- and micro-fillers spanning the nanometer to millimeter length scale...
Article
Matrix cracking of carbon fibre reinforced polymer composites at super cold temperatures, such as liquid hydrogen temperature, is a major issue for lightweight fuel storage, because the microcracks induced by the high thermal residual stresses in the matrix can cause fuel leaks and degrade the structural integrity of the storage vessel. Herein, we...
Article
Supercapacitors possessing multiple functions other than storing energy, such as bearing mechanical loads, are a promising technology for a wide range of applications. However, achieving both energy storage efficiency and mechanical strength/stiffness requires structurally strong electrolytes and high-capacitance electrodes. Herein, we report a nov...
Article
Stretchable energy harvesting sources that are comfortable to wear are urgently needed to power next-generation wearable electronics and Internet of Things (IoTs) devices. Herein we present a novel triboelectric nanogenerator (TENG) employing solid polymer electrolyte (SPE) as a stretchable and transparent electrode for the first time. The use of S...
Article
In this study, N-doped reduced graphene oxide (rGO) wrapped carbon micro fibres (CFs) were synthesized by one-step high temperature pyrolysis method. Free-standing binder-free electrodes of N-doped rGO on CF were fabricated to apply in extended flexible fibrous supercapacitors and sodium-ion batteries (NIBs). The results showed that the attachment...
Article
Integration of lithium‐ion batteries into fiber‐polymer composite structures so as to simultaneously carry mechanical loads and store electrical energy offer great potential to reduce the overall system weight. Herein, recent progresses in integration methods for achieving high mechanical efficiencies of embedding commercial lithium‐ion batteries i...
Chapter
Guided waves provide an attractive way to inspect plate-like structures due to their ability to propagate over long distances and their sensitivity to various types of defects. In this work, the disbond growth between an aluminium plate and a stiffener is evaluated through ultrasonic guided wave field imaging, which relies on the acquisition of wav...
Article
Metallic and composite z-filaments have been reported as effective solutions for improving the interlaminar fatigue resistance of fibre-polymer laminates, which is important to many applications that demand high delamination fatigue endurance. Here, we examine the mechanisms of three different z-filaments made from metallic and fibre composite mate...
Article
Structural composite batteries, which can simultaneously carry mechanical loads and store electric energy, have the potential to significantly reduce the system weight of electric-powered systems including electric cars, unmanned air systems, and mobile robots. Recent research in this area has primarily focused on carbon-fiber based lithiumion batt...
Article
An experimental investigation is presented into improving the maximum load limit and other structural properties of T-shaped laminate joints by through-thickness weaving of thin metal filaments. Preforms of carbon fibre T-joints are first woven using continuous metallic or fibrous filaments made of copper, steel or carbon fibre yarns and then infus...
Article
At cryogenic temperatures thermoset polymers suffer from low fracture toughness. Herein, we present a strengthening and toughening technique for cryogenic applications using cupric oxide (CuO) nanorods. These nanorods are synthesized via a hydrothermal reaction to give an average length of 1.64 and a diameter of 270 nm. They exhibit a low coefficie...
Article
Full-text available
Recent discoveries of two-dimensional transitional metal based materials have emerged as an excellent candidate for fabricating nanostructured flame-retardants. Herein, we report an eco-friendly flame-retardant for flexible polyurethane foam (PUF), which is synthesised by hybridising MXene (Ti $$_3\hbox {C}_2$$ 3 C 2 ) with biomass materials includ...
Article
Full-text available
Ultrasonic waves, either bulk waves or guided waves, are commonly used for non-destructive evaluation, for example in structural health monitoring. Traditional sensors for detecting ultrasonic waves include metallic strain gauges and piezoelectric ceramics. Recently piezoresistive nanocomposites have emerged as a promising sensor with high sensing...
Data
Matlab scripts for generating a ground structure with geometrically orthotropic symmetry for topology optimization. https://github.com/appreciator/Ground-Structure
Article
The last decade has witnessed an extensive uptake of clean and sustainable energy sources to meet the surging energy demand while mitigating the increasing levels of greenhouse gas emission and air pollution. Among various energy systems, electrochemical energy storage devices such as batteries and supercapacitors have attracted worldwide attention...
Article
An urgent need is to reduce the flammability of polymers and manage their toxic thermal decomposition products. Although conventional halogenated, metallic and phosphorus-based flame retardants (FRs) proved effective, they are known to cause major damage to human health and the environment. Containing carbon nanomaterials as new flame retarding add...
Article
Solid-state polymer electrolytes (SSPE) have emerged as a safer and more durable alternative to liquid electrolytes in future batteries and supercapacitors. Herein, we present a novel approach to enhance the ionic conductivity of a solid epoxy-ionic liquid (IL) nanocomposite electrolyte by creating ionic pathways in the polymer phase and linking th...
Article
Critical to the applications of pseudocapacitors is the cycling performance of electrodes. Here, we present a new carbon fibre electrode enhanced by multilayer structure of vertical graphene (VG) and manganese dioxide (MnO2) to achieve a cycling performance at a very high areal capacitance (546.3 mF/cm²) that outperforms most of the reported pseudo...
Article
Full-text available
Pentamode metamaterials are a new class of artificially engineering three-dimensional lattice composites. There exist a few types of pentamode metamaterials that are dominated by ad hoc design motifs, while a systematic design approach is still missing. This paper will present an efficient topological optimization methodology to discover a series o...
Article
The growing interest in wearable electronics has stimulated recent advances in flexible Zn–MnO2 batteries. However, the electrochemical performance of bulk MnO2 is limited by its poor electrical conductivity and inferior charge kinetics. Herein, we propose a novel MnO2-vertical graphene cathode to markedly improve the electrochemical performance of...
Article
The increase in composites usage for primary and secondary structural components demands advanced repair techniques such as doubler, multi-step, and scarf to restore a damaged structure to its original design capability. Currently, most scarf repairs employ a straight taper at a typical ratio ranging between 1:20 to 1:60 to attain the original desi...
Article
Hybrid piezo-triboelectric nanogenerators constitute a new class of self-powered systems that exploit the synergy of piezoelectric and triboelectric mechanisms to address the energy and power needs for portable and wearable...
Article
Wearable temperature sensors meeting the resolution of medical-grade thermometers are needed to continuously monitor skin temperature variations indicative of diseases and sports performance. Herein, we present a new technique for...
Article
Direct deposition of thin metal films on highly elastic substrates is a major technique to fabricate flexible electronics such as wearable sensors, stretchable transistors, and deformable displays. However, these devices...
Article
Full-text available
Machine-learning assisted laser powder bed fusion process optimization for AlSi10Mg: New microstructure description indices and fracture mechanisms, Acta Materialia (2020), doi: https://doi. Abstract In this study, a machine-learning approach based on Gaussian process regression was developed to identify the optimized processing window for laser po...
Article
Structural supercapacitor is a promising solution for reducing the overall weight of electric vehicles. To maximum the energy storage capacity of a load-carrying structure, we present a technique to create carbon fibre (CF) electrodes modified with vertical graphene (VG) and manganese dioxide (MnO 2). The results show that the hybridisation of VG a...
Article
Existing methods for electromagnetic interference suppression typically employ attaching absorbers to the external surface of a structure at a fixed distance. In this work, we present a dynamically tunable, electromagnetic interference suppression technique using a multifunctional nanocomposite that offers a wider bandwidth and exceptional absorpti...
Article
Wearable electronic devices to be worn directly on the body or integrated in clothes need to be flexible, stretchable, biocompatible, and ideally self-powered. Electrospun polyvinylidene fluoride (PVDF)/boron nitride nanosheets (BNNSs) composite nanofibers are prepared and show piezo-triboelectric response under impact and tensile loading. Without...
Article
Hydrogel‐based strain sensors have been attracting immense attention for wearable electronic devices owing to their intrinsic soft characteristics and flexibility. However, developing hydrogel sensors with hightensile strength, stretchability, and strain sensitivity remains a great challenge. Herein, we report a technique to synthesize highly sensi...
Conference Paper
In the current study, the fracture properties of angle-ply ([±55]8) carbon-epoxy (unmodified) and nanosilica-carbon-epoxy laminated (nanosilica modified) composites were investigated. Double cantilever beam (DCB) tests were carried out in order to determine the interlaminar fracture energy in terms of critical energy release rate (GIc) of the lamin...
Article
Microcracking mechanism is an effective technique for creating highly sensitive resistive strain sensors, but sensors enabled by this mechanism tend to possess a limited sensing range. Herein, we present a new method of broadening the sensing range by bridging the microcracks with conductive nano-sized fibres. The key sensing parameters such as sen...
Article
Liquid metal (LM) droplets have been demonstrated as an effective additive to transform elastomers into multifunctional composites that remain highly conductive under large mechanical deformation. Herein, we present a new phenomenon of strain hardening of polydimethylsiloxane (PDMS) composites with Galinstan LM droplet inclusions. Small LM inclusio...
Article
Achieving moldable energy storage devices will make it possible to power wearable electronics by adapting to body contours for wear comfort. Herein, we present a new approach to create hierarchically structured electrodes that enable supercapacitors to retain their capacity under mechanical deformation. The electrodes are made by first growing vert...
Article
An experimental study is presented into the strengthening of composite T-shaped joints using carbon nanoparticles. The structural properties of carbon fibre reinforced epoxy composite T-joints containing a small weight fraction (1%) of carbon nanotubes (CNTs), carbon nanofibers (CNFs) or graphene nanoplatelets (GNPs) within the polymer matrix phase...
Article
Hydrogel‐based strain sensors have attracted considerable interest for applications such as skin‐like electronics for human motion detection, soft robotics, and human–machine interfaces. However, fabrication of hydrogel strain sensors with desirable mechanical and piezoresistive properties is still challenging. Herein, a biocompatible hydrogel sens...
Article
Wave mixing offers several practical benefits relative to harmonic generation for detecting both distributed and localised damage. An analytical model is proposed for predicting the frequency, mode and direction of propagation of the mixed modes arising from the nonlinear mixing of two incident guided-wave modes at an interface exhibiting contact a...
Article
Electrocaloric phenomenon in polymers and metals has gained significant interest as alternative mechanism to conventional compressor-based refrigerators and air conditioners. This renewed interest stems from recent discoveries of the new materials that can deliver strong electrocaloric response close to room temperature. This paper presents a revie...
Article
Wearable temperature sensors with high sensitivity, linearity, and flexibility are required to meet the increasing demands for unobtrusive monitoring of temperature changes indicative of the onset of infections and diseases. Herein, we present a new method for engineering highly sensitive and flexible temperature sensors made of poly(3,4-ethylenedi...
Article
The nonlinear scattering of a longitudinal wave induced by the clapping of a pair of rough surfaces under a compressive pre-stress is investigated using a model that combines nonlinear springs and unilateral contact. This novel approach captures both the strong nonlinear response induced by clapping (intermittent loss of contact) and the weaker non...
Article
Full-text available
Fibre reinforced polymer laminates have low electrical conductivity compared to metals due to the high resistivity of the matrix phase, fibre-matrix interface, and fibres. This paper presents a new method for improving the electrical conductivity of fibre-polymer composites by through-thickness weaving of continuous filaments with high electrical c...
Conference Paper
Full-text available
The interfacial interaction between carbon fibre and epoxy matrix is critical to the mechanical performance of fibre-reinforced composites. In this research we graft vertical graphene (VG) on single carbon fibres using plasma-enhanced chemical vapour deposition (PECVD). The effects of VGs grafting on carbon fibre surface roughness, wettability, ten...
Article
Multi-functional fiber reinforced composites with magneto properties offer great potential for enabling new applications in a diverse range of industry sectors, such as aerospace, automotive, biomedical, and civil infrastructures. By incorporating magnetic properties into existing fiber reinforced polymer composites (FRPC), it is possible to enhanc...
Article
This paper presents a new approach for greatly increasing the delamination resistance of fibre reinforced polymer composites via through-the-thickness weaving of high-strength, high-toughness metal z-filaments. Dry carbon fabric preforms were woven in the through-thickness direction with thin and continuous stainless steel or copper filaments, and...
Article
The interface between magnetic particles and polymer matrix is a key factor for the structural properties and actuation properties of magneto-composites. Herein we present a functionalisation method for carbonyl iron particles using epoxy silane. Experimental results from mechanical and electromagnetic tests reveal that this functionalisation incre...
Article
Polymer nanocomposites dielectrics have attracted increasing attention for electric energy storage applications in recent years due to their enhanced dielectric performance by combining the high permittivity of nanoparticles and the high electrical breakdown strength of polymer matrix. Herein we present a review of the recent advances in the modell...
Article
Quantitative information of the magnitudes and directions of multiple contacting forces is crucial for a wide range of applications including human-robot interaction, prosthetics, and bionic hands. Herein we report a highly stretchable sensor integrating capacitive and piezoresistive mechanisms for simultaneous measurement of multiple forces. The s...
Article
Liquid metals are fast becoming a new class of universal and frictionless additives for the development of multifunctional soft and flexible materials. Here, nano-droplets of eutectic gallium–indium alloy, liquid at room temperature, were used as a platform for the formulation of electrically conductive and magnetically responsive gels with the inc...
Article
A bio-flame retardant filler was synthesized via the self-polymerization of dopamine hydrochloride in alkaline condition, yielding nano-sized polydopamine (nano-PDA) particles ranging between 50 and 100 nm in diameters. Adding a small amount (2 wt%) of the nano-PDA particles into an epoxy can remarkably reduce the value of peak heat release rate by...
Article
The rapid rise in the applications of carbon fibre reinforced polymer matrix composites (CFRPs) is creating a waste recycling challenge. The use of high-performance thermoset polymers as the matrix makes the recovery of the fibres and the resins extremely difficult. Implementation of a circular economy that can eliminate waste and re-use resources...
Article
A key missing technology for the emerging field of soft robotics is the provision of highly selective multidirectional tactile sensing that can be easily integrated into a robot using simple fabrication techniques. Conventional strain sensors, such as strain gauges, are typically designed to respond to strain in a single direction and are mounted o...