Yi Min Xie

Yi Min Xie
RMIT University | RMIT · Centre for Innovative Structures and Materials

Doctor of Philosophy

About

502
Publications
231,932
Reads
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20,107
Citations
Introduction
Yi Min 'Mike' Xie is RMIT Distinguished Professor, Australian Laureate Fellow, Director of Centre for Innovative Structures and Materials, and Fellow of Australian Academy of Technology and Engineering. His main research interests are structural design and optimisation, computational mechanics, mechanical metamaterials, additive manufacturing, biomaterials and medical devices. He has collaborated with a wide range of companies in Australia and overseas, including Arup, Aurecon, and Boeing.
Additional affiliations
February 2012 - present
RMIT University
Position
  • Managing Director
November 1987 - October 1991
Swansea University
Position
  • PostDoc Position
Education
November 1987 - August 1990
University of Wales
Field of study
  • Computational Mechanics
September 1980 - July 1984
Shanghai Jiao Tong University
Field of study
  • Engineering Mechanics

Publications

Publications (502)
Article
For the thin-film solar cells embedded with nanostructures at their rear dielectric layer, the shape and location of the nanostructures are crucial for higher conversion efficiency. A novel two-level hierarchical nanostructure (a sphere evenly covered with half truncated smaller spheres) can facilitate stronger intensity and wider scattering angles...
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The current techniques for topology optimization of material microstructure are typically based on infinitely small and periodically repeating base cells. These base cells have no actual size. It is uncertain whether the topology of the microstructure obtained from such a material design approach could be translated into real structures of macrosca...
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This paper presents a bidirectional evolutionary structural optimization (BESO) method for designing periodic microstructures of two-phase composites with extremal electromagnetic permeability and permittivity. The effective permeability and effective permittivity of the composite are obtained by applying the homogenization technique to the represe...
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Evolutionary Structural Optimization (ESO) and its later version bi-directional ESO (BESO) have gained widespread popularity among researchers in structural optimization and practitioners in engineering and architecture. However, there have also been many critical comments on various aspects of ESO/BESO. To address those criticisms, we have carried...
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Topology optimization techniques are typically performed on a design domain discretized with finite element meshes to generate efficient and innovative structural designs. The optimized structural topologies usually exhibit zig-zag boundaries formed from straight element edges. Existing techniques to obtain smooth structural topologies are limited....
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Auxetic materials and structures have received extensive attention due to their unusual behavior. As one of the structures that can realize the auxetic effect, the elliptic perforated structure has been recently developed, but the previous research on the elliptic perforated is limited to the small deformation stage. At the end of the small deforma...
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Shell structures are widely used in architectural design and civil engineering. However, it remains challenging to simultaneously optimize their shape, thickness, and topology under various design constraints and construction requirements. This work presents a method for the shape–thickness–topology coupled optimization of shell structures. In this...
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Concrete-filled stainless steel tube (CFSST) members take advantage of the high strength and the outstanding corrosion resistance to act as an important role in civil engineering structures. However, the steel tube could not provide the perfect confinement effect for the core concrete during the initial elastic compression stage because Poisson’s r...
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This paper proposes a novel bridge design approach based on multi-material topology optimization, which realizes the process from conceptual design to detailed design, and an innovative bridge form is obtained with the proposed approach. In the present study, the multi-material bi-directional evolutionary structural optimization (MBESO) method, whi...
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Purpose Optimised concrete components are often of complex geometries, which are difficult and costly to cast using traditional formworks. This paper aims to propose an innovative formwork system for optimised concrete casting, which is eco-friendly, recyclable and economical. Design/methodology/approach In the proposed formwork system, ice is use...
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Ribbed floor systems, which include ribbed slabs and columns, are used extensively to enhance thestructural performance of buildings. With the emerging topology optimization and advancedmanufacturing techniques, the material usage and construction process of the ribbed floor systems canbe improved significantly to achieve higher efficiency and sust...
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Shape and topology optimization techniques aim to maximize structural performance through material redistribution. Effectively controlling structural complexity during the form-finding process remains a challenging issue. Structural complexity is usually characterized by the number of connected components (e.g., beams and bars), tunnels, and caviti...
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Goldberg polyhedra have been widely studied across multiple fields, as their distinctive pattern can lead to many useful applications. Their topology can be determined using Goldberg’s method through generating topologically equivalent structures, named cages. However, the geometry of Goldberg polyhedra remains underexplored. This study extends Gol...
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Goldberg polyhedra have been widely studied across multiple fields, as their distinctive pattern can lead to many useful applications. Their topology can be determined using Goldberg’s method through generating topologically equivalent structures, named cages. However, the geometry of Goldberg polyhedra remains underexplored. This study extends Gol...
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This work uses the zero-level contour of a parameterized level set function, a linear combination of cubic B-spline basis functions, to express the structural profile in structural topology optimization. Together with mean compliance, diffusion energy is minimized under a volume constraint to control the structural complexity. The design variables,...
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Kirigami techniques use prescribed arrangements of cuts and fold lines to transform 2D sheet materials into complex 3D forms. These sheet transformations occur via elastic deformations, rigid folding motions, and/or pop-up mechanisms; design techniques for kirigami patterns are correspondingly based on mechanics, kinematics, and physical prototypin...
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An auxetic metamaterial consisting of a re-entrant honeycomb structure with hierarchical characteristics is proposed. The new structure is constructed by attaching small re-entrant structural unit cells to the nodes of the traditional re-entrant structures. Not only can the overall stiffness and stability of the proposed structure be tuned during c...
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In order to fully comprehend dynamic responses of metallic auxetic honeycombs, drop hammer impact tests and corresponding finite element (FE) analyses were conducted. The three-dimensional (3D) printing technology was adopted to manufacture stainless steel specimens with varying cell side length-to-thickness ratios and cell configurations. The spec...
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Preceramic polymers, which are converted into ceramics upon heat treatment, offer an advantage of combining the shaping and synthesis of ceramics parts. In this work, the Polymer Infiltration and Pyrolysis (PIP) process is employed to fabricate ceramic composite prototypes using preceramic polymers with carbon/glass fabrics, followed by experimenta...
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Most structures around us carry loads. The performance of a structure usually depends on its geometry, material properties, support conditions, and load conditions. In the past decades, various optimization techniques have been developed to modify these ingredients to improve structural performance. However, existing optimization techniques are typ...
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Inspired by the strengthening mechanism of crystal twinning boundary, this work proposes a novel strategy for lattice metamaterial design to improve stiffness, strength, and toughness. At the microscale, the inclination variable of unit-cell is introduced into the analytical formula of modulus in the compression direction. Then, the mechanical cons...
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As a branch of auxetics, the re-entrant hexagonal honeycomb has many superior mechanical performances. However, most research focused on two-dimensional (2D) re-entrant structures or three-dimensional (3D) structures without high compressibility. The energy absorption capacity of such structures is deficient for practical applications. Therefore, i...
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Auxetic metamaterials tend to be fabricated using additive manufacturing and laser cutting due to their special porous microstructures. Although the auxetic metamaterials have many applications currently, the high cost and the low efficiency of available manufacturing are adverse to expend their application range. In this work, the auxetic chiral h...
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Besides constituting components, the properties of composites are highly relevant to their microstructures. The work proposed a fast Fourier transform (FFT)-based inverse homogenization method implemented by the bi-directional evolutionary structural optimization (BESO) technique to explore the vast potential of cellular materials. The periodic bou...
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近年来,越来越多的设计师使用拓扑优化技术来寻找优美且新颖的建筑设计。然而由于无法直接满足建筑师与工程师提出的诸多设计需求,现有方法生成的拓扑优化设计往往很少在实际案例(特别是大型项目)中出现。本文指出了拓扑优化中惯用假设的局限性,并揭示了寻找设计多解的重要性。为了生成多样化、高性能且满足使用需求的设计,我们突破了这些限制并提出了面向建筑领域的拓扑优化新方法。与传统的拓扑优化不同,我们可以将荷载和边界条件作为额外的设计变量,以显著提高最终设计的结构性能。此外,改变设计域能带来更多的可能性,使设计者可以从诸多设计方案中的获得满意的结果。
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The integration between 3D concrete printing (3DCP) and topology optimization (TO) enables the fabrication of structurally efficient components without expensive formwork and intensive labor. However, manufacturing constraints of 3DCP are impeding the integration between the two fields, and there has been limited research on this topic. In this pap...
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Auxetic metamaterials have attracted increasing attention due to their exceptional mechanical properties. However, the critical parameters of mechanical response and Poisson's ratio would be changed simultaneously when a geometrical parameter is tuned, which is adverse to achieving the quantitative design of energy absorption by tuning a single geo...
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The bi-directional evolutionary structural optimization (BESO) method effectively uses basic strategies of removing and adding material based on element sensitivity. However, challenges remain in generating smooth boundaries to improve the finite element analysis accuracy and achieve structural aesthetics. This work develops a body-fitted triangula...
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To investigate the characteristics of optimal fail-safe structures subjected to single and multi-member damage scenarios, we consider a pin-jointed cantilever truss with all members directly connected from the load point to the boundary. Two problem formulations are considered-minimizing the compliance with a volume constraint and minimizing the vo...
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In recent years, topology optimization has become a popular strategy for creating elegant and innovative forms for architectural design. However, the use of existing topology optimization techniques in practical applications, especially for large-scale projects, is rare because the generated forms often cannot satisfy all the design requirements of...
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This research addresses innovations in building structural components through the generative design technique Bi-directional Evolutionary Structural Optimization (BESO) and the application of large-scale 3D robotic printing to produce efficient and elegant spatial structures. The innovative pavilion discussed in this paper demonstrates a design pro...
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In extrusion-based additive manufacturing, path filling patterns may significantly affect the printing process. To overcome printing defects incurred by path discontinuity, a Globally Continuous Hybrid Path (GCHP) is developed to solidly fill or partially fill connected domains. Discontinuous contour paths and single zigzag paths are constructed to...
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An auxetic metamaterial composed of novel re-entrant unit cells was proposed. The new re-entrant structure was constructed by adding wedge-shaped parts to the conventional re-entrant structure. Not only can the additional part regulate the structural stiffness during compression but it can also increase the stability of the structure by hindering l...
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The present study aimed to evaluate the effect of vibration time on steel fibre distribution and flexural behaviours of steel fibre reinforced concrete (SFRC) with different flowability, three different vibration times (i.e., 10 s, 30 s and 60 s) were selected to compact SFRC specimens on the vibration table in this study. The flowability of SFRC w...
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In the past decades, auxetic metamaterials have attracted extensive attention due to their desirable properties. In order to further improve the energy absorption properties of auxetic metamaterials, this work investigates the design of lightweight auxetic metamaterials based on the elliptic perforated plate. The material in the large deformation r...
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Auxetic foam materials contract (expand) laterally under uniaxial compressive (tensile) load. Due to superior characteristics of auxetic foam, e.g., shear resistance and in-plane indentation resistance, studies of auxetic foam composites have been increasing in recent years. In this paper, a novel cement-based auxetic foam composite is designed, fa...
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Two-dimensional phononic metamaterials, consisting of plates with resonant cylinders, can significantly attenuate waves by opening a subwavelength bandgap, though their characteristic unit cell size is small. To realize the real-time adjustment of the bandgap, external excitations including mechanical load, temperature field, electric field and mag...
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Dividing a sphere uniformly into equal-area or equilateral spherical polygons is useful for a wide variety of practical applications. However, achieving such a uniform subdivision of a sphere is a challenging task. This study investigates two classes of sphere subdivisions through numerical approximation: (i) dividing a sphere into spherical polygo...
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Purpose: Irregularly shaped architectural designs with surfaces curved in multiple directions, known as free-form designs, have gained significant public interest in recent decades. However, it is challenging to convert complex designs into real structures. This paper aims to realize free-form construction by developing a novel workflow in which ad...
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Concrete is a principal construction material in building industry. Formwork plays an important role in assisting geometry realisation and strength development of concrete elements. It is also one of the major costs in the construction of concrete structures. The use of formwork has a long history, and various formwork systems have been used in dif...
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Large format additive manufacturing (LFAM) has witnessed rapid development in recent years and facilitated digital fabrications of geometrically intricate structures. However, there has been limited research on toolpath optimization tailored for LFAM. This paper presents a novel framework to generate a globally continuous toolpath for both solid an...
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Auxetic materials are a class of mechanical metamaterials. They exhibit lateral expansion under tension, and lateral contraction under compression. Such metamaterials have attracted increasing attention due to their unusual mechanical behaviour and various potential applications. However, the stiffness of auxetic structures is much weaker than that...
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Natural phenomena have been explored as a source of architectural and structural design inspiration with different approaches undertaken within architecture and engineering. The research proposes a connection between two dichotomous principles: architectural complexity and structural efficiency through a hybrid of natural phenomena, topology optimi...
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Auxetic materials exhibit desirable mechanical properties, e.g., fracture resistance, shear resistance and energy dissipation due to their unique deformation characteristics. Honeycomb sandwich structures also have superior properties, e.g., energy absorption performance and low density. These desirable characteristics enable them as promising alte...
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This work proposes a nodal‐based evolutionary design optimization algorithm to design frame structures whose edges are the Delaunay triangulation of homogeneously distributed nodes in the design domain. The remaining nodes can freely sway in the design domain except for the loading nodes and boundary nodes. As a result, it can extend the space of a...
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Dividing a 2-dimensional sphere uniformly into a large number of spherical polygons is a challenging mathematical problem, which has been studied across many disciplines due to its important practical applications. Most sphere subdivisions are achieved using spherical triangles, quadrangles, or a combination of hexagons and pentagons. However, sphe...
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This paper provides a numerical investigation on the ballistic performance of ceramic composite armour panels with porous architectures inspired by nacre from mollusc shells. The development of such armour panels can lead to reduced weight and improve ballistic performance through projectile rotation induced by non-uniform contact stresses. The por...
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Novel 3D printed square auxetic tubular lattice (SATL) structures were designed, fabricated and investigated. Their mechanical properties were examined by the finite element method and experiments. The height and wall thickness show different effects on the mechanical properties of SATL structures. Compared with the circular auxetic tubular (CATL)...
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Topology optimization has rapidly developed as a powerful tool of structural design in multiple disciplines. Conventional topology optimization techniques usually optimize the material layout within a predefined, fixed design domain. Here, we propose a subdomain-based method that performs topology optimization in an adaptive design domain (ADD). A...
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Auxetic foams counter-intuitively expand (shrink) under stretching (compression). These foams can exhibit superior mechanical properties such as resistance to shear and indentation, improved toughness and energy absorption (EA) under several types of loadings. Their unique deformation mechanism and manufacturing process lead to special multiphysics...
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Shell bridges have attracted extensive interest in engineering research and practice. This paper aims to evaluate the effects of longitudinal and transverse curvatures on the optimal design of the shell bridge. For this purpose, a slant-legged steel shell footbridge with the same initial and target volumes of steel was chosen to build parametric ge...