Solidification Processing Of Metal Matrix Composites

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Electrodeposition has been widely used to develop micro-mechanical devices because it offers high dimensional accuracy, flexibility, and relatively low cost. In devices such as mechanical watches, micro-components are required to be made from non-magnetic, hard, and wear-resistant materials. Copper is a common non-magnetic material used in the electrodeposition process, but its intrinsic low strength and soft mechanical behavior limit its use in such applications. These limitations can be overcome by devel

Due to its combination of performance and cost, bisphenol-A remains a dominant component in epoxy resins, despite its classification as an endocrine disruptor and its role in producing materials highly resistant to degradation1,2. Here, we show that diols derived from acetalized xyloses, despite their distinct structure, can closely mimic bisphenol’s reactivity, rigidity and connectivity in epoxies, while offering comparable formulation properties, enabling them to act as drop-in replacements for BPA. Xylos

UHPFRC stands for ultra-high-performance fibre-reinforced-cementitious composite material, that is complemented by reinforcing steel bars to form a R-UHPFRC strengthening layer. UHPFRC “upcycling” has the goal to enhance the resistance and durability of deficient structural elements in reinforced concrete. It helps to avoid the still widespread and material- and cost-intensive practice of “demolition-replacement” of deficient reinforced concrete bridges. As UHPFRC “upcycling” often offers significant cost a

Advancements in additive manufacturing (AM) have accelerated research on multi-materials. Among metal AM techniques, laser powder-bed fusion (L-PBF) stands out for its precision and suitability for lab-scale studies, making it the primary platform for multi-material AM research. However, fusion-based AM processes such as L-PBF face persistent challenges when combining dissimilar alloys, primarily due to the metallurgical incompatibility of alloy pairs. While systems with high solubility are generally easier

Common metal additive manufacturing technologies require intensive energy sources such as lasers to achieve the melting and bonding of a metallic feedstock. This leads to a sizeable carbon footprint especially for reflective materials such as aluminium. Moreover, it induces complex and turbulent melt pool dynamics leading to stochastic defect formation mechanisms that are hence difficult to suppress. We aim to propose an alternative approach similar to what is now practised on a large scale with thermoplast

The Triemli Personalhäuser are three equal 15-story buildings located on the Zürich Triemli Stadtspital campus and erected between 1964 and 1969. Cast-in-place reinforced concrete (RC) slabs and walls form the building cores and their surrounding corridors. The rooms are arranged around these cores. The load-bearing intermediate walls, made of prefabricated masonry, support thin precast slabs used as permanent forms. A RC layer is cast over these precast slabs and connects the room slabs with the cast-in-pl

Many historical centres in Europe, including the city centre of Zagreb, feature masonry building aggregates, which developed as the building layout of the city was densified. Adjacent buildings in aggregates often share a structural wall and the building that was constructed second connects to the wall of the first building through a dry joint. When compared to the response of single freestanding buildings, several factors make the seismic response of masonry building aggregates more complex: It is not unus

Nonlinear Finite Element Analysis (NLFEA) of the inelastic behaviour of RC walls are often carried out for uni-directional (in-plane) horizontal cyclic loading. In this paper the behaviour of RC walls with different cross-sections (T-shaped and U-shaped) subjected to bi-directional (in-plane and out-of-plane) loading is simulated by means of NLFEA. They are carried out with the software DIANA, using curved shell elements and a total strain crack model for concrete and embedded truss elements adopting Monti-

This paper presents the first part of a series of uniaxial cyclic tests on lap-splices. The work is conducted within the framework of a project on the seismic behaviour of existing, poorly detailed bridge piers which are typically constructed with a lap-splice above the footing. The test series presented here was initiated to study the influence of load history, specially with regards to the compression levels, and confinement on the behaviour of lap-splices. The test units represent the boundary elements o

Béton brut and ineffable space: two concepts defined by Le Corbusier after World War II that speak about a stronger dialogue between materials and artistic vision of his work. Invented to designate his own particular use of exposed concrete, béton brut is analysed from different perspectives: its fabrication with a rigorous selection of its constituent materials; its textural imprint obtained by a refined assembly of formwork; and the treatment of its surface with special types of paint. In the synthesis of

Carbon-epoxy prepregs are generally used to form the skins of honeycomb sandwich structures used in aerospace or racing yachts. For some applications, it is desirable to increase the thickness of the skins. In order to achieve an ideal core pressure level during cure for maximal skin-core bonding, the issue of air extraction from the honeycomb cells through the skin during processing thus becomes critical, in particular if vacuum only processing is used. In the present work, partially impregnated prepregs,

A composite material consisting of carbon nanofibers (CNFs) grown on sintered metal fiber filters was modified by H2O2 or plasma-generated O3. Coupling temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) techniques in the same UHV apparatus allowed the direct correlation of the nature of the created O-functional groups and their evolution as CO and CO2 upon heating. The two oxidative treatments yielded different distributions of O-containing groups. The relative contribution o

NiTi alloy wires were embedded during the infusion processing of woven carbon fibre reinforced plastic (CFRP) composite plates with the purpose to passively increase their damping. Two types of NiTi wires, having the same diameter of 203 mu m, were considered, one superelastic at room temperature, the other one martensitic. For the first one, a martensitic transformation was induced by applying a pre-strain of 2.5% before embedding the wires. The coexistence of austenite and martensite should provide dampin

The resistance as well as strain hardening and softening properties of UHPFRC depend on the type of matrix and mainly on the initial fibre dosage and final fibre distribution and orientation in the cast element. According to the final fibre distribution and orientation these properties may vary in a wide range. The strength and deformability distribution in a thin UHPFRC panel is studied. Tensile and flexural specimens cut in different directions and at different positions in the panel are analysed in order

The aim in this project was the optimization of LaFeO3-based perovskite materials for oxygen separation membranes (OSM). The work was carried out by the Laboratory for High Performance Ceramics, Empa in collaboration with the Laboratory for Industrial Energy Systems, LENI, EPFL and the Ceramics Laboratory, LC, EPFL. The ceramic material of interest is a mixed conductor for oxygen ions and electrons at high temperature (800°-900°C) and therefore can separate oxygen from nitrogen with 100% selectivity when

The rigidity function of a matrix is defined as the minimum number of its entries that need to be changed in order to reduce the rank of the matrix to below a given parameter. Proving a strong enough lower bound on the rigidity of a matrix implies a nontrivial lower bound on the complexity of any linear circuit computing the set of linear forms associated with it. However, although it is shown that most matrices are rigid enough, no explicit construction of a rigid family of matrices is known. In this surve

The importance of Fibre Reinforced Polymers (FRPs) as a material used for civil engineering purposes has grown in the last decade. Especially the introduction of pultrusion at an industrial level as a way to produce big batches of FRP made it possible to offer the advantages – like the high strength-to-weight ratio or the good corrosion resistance – at a reasonable cost. One issue when designing with pultruded FRPs are the connections. Up to now, connections between pultruded FRPs have been designed in the

The reinforcement potential of pulp fibres is presently not fully explored in thermoplastic composites. One of the reasons is that currently used processing methods comprise several severe thermomechanical steps inducing premature degradation of the fibres. Three pre-forming techniques were developed to prepare pulp fibre reinforced cellulose diacetate (CDA) pre-forms, namely filtration-forming, solvent impregnation, and commingling with polymer fibres. These techniques eliminate all thermomechanical steps,

Microstereolithography is a technology at the interface of the microengineering and rapid prototyping domains. It has evolved from the stereolithography technique, and is also based on a light-induced layer- stacking manufacturing, As the resolution of the microstereolithography technique is far better than the one of rapid prototyping technologies, this technique is of particular interest in the microengineering domain where its 3D capability allows the production of components no other microfabrication te

A process has been developed where multiple yarns of commingled glass and polypropylene are heated and placed to a desired geometry. The placed unidirectional (UD) tow is then encapsulated by over-moulding with glass mat thermoplastics (GMTs). The effects of both force (20 80 N), with an equivalent pressure range of 8 46 bar, and the displacement rate (20 100 mm/s) during tow placement on void content and flexural modulus were investigated for nine placement conditions. Placement rate affected the tow quali

Solidification Processing Of Metal Matrix Composites

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Electrochemical deposition of composite materials: unravelling the process-structure-property nexus

Xylose-based diols are safe bisphenol analogues that induce degradability in epoxy resins

UHPFRC “Upcycling” of Deficient Reinforced Concrete Bridges

Cracking in Additive Manufacturing of Immiscible Multi-Materials: Mechanisms and Mitigation Strategies

Magnetic Field-Assisted Direct Liquid Metal Deposition

Zürich Stadtspital Triemli Personalhäuser – Resource assessment of structural elements

Modelling historical masonry aggregates using the Equivalent Frame approach

Validation of NLFEA of reinforced concrete walls under bidirectional loading

Behaviour of poorly detailed lap-splices under cyclic loading

Le Corbusier: Béton Brut and Ineffable Space, 1940-1965

Hybrid processing of thick skins for honeycomb sandwich structures

Combined XPS and TPD study of oxygen-functionalized carbon nanofibers grown on sintered metal fibers

Passive damping of composites with embedded shape memory alloy wires

STRENGTH AND DEFORMABILITY DISTRIBUTION IN UHPFRC PANELS

Optimization of mixed conducting perovskites for the application in dense ceramic oxygen separation membranes, used in partial oxidation of natural gas to synthesis gas

On Matrix Rigidity and the Complexity of Linear Forms

Adhesively bonded lap joints of pultruded GFRP shapes

Novel Pulp Fibre Reinforced Thermoplastic Composites

Microstereolithography: a review

Robotic tow placement for local reinforcement of glass mat thermoplastics (GMTs)