Dynamic Properties of Mechanical Metamaterials: Optimization and Experiment. The aim of this project is to develop novel mechanical metamaterials through topology optimization for manipulating the propagation of elastic and acoustic waves. Mechanical metamaterials achieve exotic dynamic properties, which have many applications ranging from noise management and vibration control to defence. The computational tool and optimization algorithms to be developed will seamlessly integrate with additive ....Dynamic Properties of Mechanical Metamaterials: Optimization and Experiment. The aim of this project is to develop novel mechanical metamaterials through topology optimization for manipulating the propagation of elastic and acoustic waves. Mechanical metamaterials achieve exotic dynamic properties, which have many applications ranging from noise management and vibration control to defence. The computational tool and optimization algorithms to be developed will seamlessly integrate with additive manufacturing to enable the end-users to characterize, design and fabricate the next generation of mechanical metamaterials in an effective way. The outcomes of this project offer significant benefits for the long-term and sustainable development of knowledge-based economy in Australia.Read moreRead less
Catastrophic Rock and Concrete Brittle Failures. Brittle rocks and concrete under extreme stresses fracture spontaneously and without pre-warning. In deep mining and tunnelling this causes fatalities, injuries and serious damage. Based on recent advances by the CIs in understanding the effect of biaxial loading and the free surface on catastrophic fracture propagation, the project aims to develop a new paradigm of monitoring, prediction and prevention of dangerous skin rock burst-type failures. ....Catastrophic Rock and Concrete Brittle Failures. Brittle rocks and concrete under extreme stresses fracture spontaneously and without pre-warning. In deep mining and tunnelling this causes fatalities, injuries and serious damage. Based on recent advances by the CIs in understanding the effect of biaxial loading and the free surface on catastrophic fracture propagation, the project aims to develop a new paradigm of monitoring, prediction and prevention of dangerous skin rock burst-type failures. A unique experimental methodology, measurements and analytical and numerical models will be employed to provide a better understanding of the fundamental processes in rock fracturing. This will lead to safer and more cost-effective deep rock engineering designs.Read moreRead less
Next generation nondestructive inspection using guided-wave mixing. This project aims to develop a novel approach for early damage detection. It relies on a systematic experimental investigation of nonlinear ultrasonic interaction between different input wave modes in the presence of damage, so as to identify optimal mode selections and operating parameters that will maximise the sensitivity to particular forms of structural damage. The effects of in-service loading on wave-mixing response, and ....Next generation nondestructive inspection using guided-wave mixing. This project aims to develop a novel approach for early damage detection. It relies on a systematic experimental investigation of nonlinear ultrasonic interaction between different input wave modes in the presence of damage, so as to identify optimal mode selections and operating parameters that will maximise the sensitivity to particular forms of structural damage. The effects of in-service loading on wave-mixing response, and non-contact detection suitable for hard-to-inspect surface conditions, will also be investigated. The new developments will help transform existing schedule-based maintenance practice to a condition-based maintenance paradigm, to achieve significant cost savings in maintenance.Read moreRead less
Theory and methods for evaluation of microstructural fatigue damage. The microstructural damage accumulation stage often consumes a significant portion of the total fatigue life of structures. However, its progressive evaluation is beyond the reach of safety inspection techniques which are currently employed to maintain structural integrity and prevent fatigue failures. This project aims to fill this gap by developing innovative methods for the measurement of material properties related to fatig ....Theory and methods for evaluation of microstructural fatigue damage. The microstructural damage accumulation stage often consumes a significant portion of the total fatigue life of structures. However, its progressive evaluation is beyond the reach of safety inspection techniques which are currently employed to maintain structural integrity and prevent fatigue failures. This project aims to fill this gap by developing innovative methods for the measurement of material properties related to fatigue damage and establishing a new theory which links these properties to the remaining life of the structure. The project outcomes will facilitate the global trend towards predictive maintenance strategies, thereby generating substantial cost benefits, specifically, for high-value assets and ageing infrastructure.Read moreRead less
Topological Design of Mechanical Meta-Structures. This project aims to establish a new computational design methodology to address current challenges facing creation of ultralight structures with ultra-high-performance characteristics. The latest technologies in structural topology optimization and its correlated numerical simulation and structural analysis methods will be unified towards an integrated design framework. Expected outcomes include an advanced generative design platform for discove ....Topological Design of Mechanical Meta-Structures. This project aims to establish a new computational design methodology to address current challenges facing creation of ultralight structures with ultra-high-performance characteristics. The latest technologies in structural topology optimization and its correlated numerical simulation and structural analysis methods will be unified towards an integrated design framework. Expected outcomes include an advanced generative design platform for discovering novel geometries to underpin new meta-structure architectures, validated by appropriate fabrication techniques considering their geometric complexity. Such capabilities will benefit defence, civil, aerospace, energy and transport industries that pursue competitive advantage through innovation.Read moreRead less
A new energy absorption system for brain injury mitigation. This research aims to propose and investigate a next generation high-energy absorbing helmet pad that will protect the Australian Defence Force soldiers against both ballistic and blast threats. New fundamental knowledge in the area of high-energy absorbing metamaterials will be obtained by using numerical modelling and experimental studies. The expected outcomes of the project include the development of a new wearable energy absorbing ....A new energy absorption system for brain injury mitigation. This research aims to propose and investigate a next generation high-energy absorbing helmet pad that will protect the Australian Defence Force soldiers against both ballistic and blast threats. New fundamental knowledge in the area of high-energy absorbing metamaterials will be obtained by using numerical modelling and experimental studies. The expected outcomes of the project include the development of a new wearable energy absorbing pad which can be used as the next generation combat helmet liners and accessories. The novel high-performance energy absorption system will have a wide range of direct applications in future personal armour, as well as sports gears and elderly healthcare products.Read moreRead less
Modelling surface stresses in crystalline plates. This project intends to improve our understanding of the influence of surface stress on bending in anisotropic crystalline plates. Micro/nanoelectro-mechanical systems as transducers, switches, logic gates, actuators and sensors are widely used in fields of biotechnology, medicine, automotive, civionics, avionics and defence. A key issue that affects the accuracy and reliability of these systems is how to correctly predict the size-dependent surf ....Modelling surface stresses in crystalline plates. This project intends to improve our understanding of the influence of surface stress on bending in anisotropic crystalline plates. Micro/nanoelectro-mechanical systems as transducers, switches, logic gates, actuators and sensors are widely used in fields of biotechnology, medicine, automotive, civionics, avionics and defence. A key issue that affects the accuracy and reliability of these systems is how to correctly predict the size-dependent surface stress of the structural components in the systems. The project aims to quantify the relations between the change in surface stress and the bending of structures with micro/nanoscale thickness and arbitrary crystallographic symmetry. Expected project outcomes may lead to significant advancement in overcoming the current shortcomings in designing micro/nanoelectro-mechanical devices.Read moreRead less
Functionally Graded Ultra High Perfomance Concete Structure under Flexure. This project aims to develop a novel multilayer functionally graded concrete structure that is a mixture of normal strength concrete and ultra high performance concrete with the mixing ratio varying in a layer-wise manner, offering a highly cost-effective structural design solution with significantly improved safety and durability over conventional concrete structures. The expected outcomes include the innovative design, ....Functionally Graded Ultra High Perfomance Concete Structure under Flexure. This project aims to develop a novel multilayer functionally graded concrete structure that is a mixture of normal strength concrete and ultra high performance concrete with the mixing ratio varying in a layer-wise manner, offering a highly cost-effective structural design solution with significantly improved safety and durability over conventional concrete structures. The expected outcomes include the innovative design, experimental data on the static and dynamic structural behaviour, development of reliable simulation techniques and optimal design procedures for the proposed structure with greatly reduced material costs. The project will have huge benefits to Australian civil engineering industry and national economy.
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Constricted hydraulic fracture opening. This project aims to develop experimentally verified models for designing and monitoring of hydraulic fractures with constricted openings, to ensure adequate and robust hydraulic fracture control for example in petroleum production. Hydraulic fractures are often constricted by bridges that hold two sides of the fracture together. Failure to account for bridges and constriction of fractures can lead to premature screen-out (exceeding available pump pressure ....Constricted hydraulic fracture opening. This project aims to develop experimentally verified models for designing and monitoring of hydraulic fractures with constricted openings, to ensure adequate and robust hydraulic fracture control for example in petroleum production. Hydraulic fractures are often constricted by bridges that hold two sides of the fracture together. Failure to account for bridges and constriction of fractures can lead to premature screen-out (exceeding available pump pressure) of proppant and inadequate fracking control. The project results are expected to substantially increase the accuracy of design and monitoring of fracture opening, geometry and fluid flow to improve efficiency, safety and environmental security of the resource and energy extraction.Read moreRead less
Bragg-Edge neutron transmission strain tomography. This project aims to use neutron strain tomography to improve solid mechanics research and advanced manufacturing techniques. The investigators have developed a tensor reconstruction algorithm, similar to an enhanced CT or MRI scan, which can determine the finely grained three-dimensional triaxial stress distribution inside solid objects by measuring neutron transmission. Using energy-resolved neutron detector technology, this project intends to ....Bragg-Edge neutron transmission strain tomography. This project aims to use neutron strain tomography to improve solid mechanics research and advanced manufacturing techniques. The investigators have developed a tensor reconstruction algorithm, similar to an enhanced CT or MRI scan, which can determine the finely grained three-dimensional triaxial stress distribution inside solid objects by measuring neutron transmission. Using energy-resolved neutron detector technology, this project intends to realise and extend this technique to transform several areas of applied mechanics research.Read moreRead less