Publications related to Rotational molding

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With the growing demand for miniaturized, self-powered devices, energy harvesting technologies that can exploit ambient and physiological energy sources have gained increasing attention. Beyond conventional batteries, strategies to convert energy from the human bodyâ such as heat or mechanical deformationâ into electricity are especially attractive for wearable electronics and distributed sensing platforms. These processes often rely on polar materials such as polyvinylidene fluoride (PVDF). However, PVDF

The development of more cost-effective and efficient proton exchange membrane (PEM) water electrolysis cells requires the use of thinner membranes with extended lifetimes and reduced gas crossover. One approach to address these challenges involves the incorporation of radical scavengers to mitigate radical-induced ionomer degradation and gas recombination catalysts to promote the conversion of crossover hydrogen and oxygen to water. The positioning effects of these two catalyst interlayers in composite memb

Microstructural analysis of resin flow in liquid composite molding is impeded by the absence of a characterization method that possesses both the required spatial and time resolution to capture the ongoing phenomena. An optimized UV‐flow freezing methodology is presented to rapidly capture dynamic flow behavior, followed by high‐resolution micro‐computed tomography (μCT) imaging to extract the flow front morphology. Optimisation of the resin strongly enhances the photopolymerisation kinetics, reducing the g

Porous cohesive materials can fail and collapse under compressive stresses. This mechanical behavior is generally referred to as anticrack and in snow, it is at the origin of catastrophic avalanches. In this study, we investigate how the microstructure of a porous cohesive granular material affects its yield surface and plastic flow. The porous cohesive samples are generated based on Baxter's Sticky Hard Spheres which allows to independently control the volume fraction and coordination number of the samples

Characterizing the nucleation of anticracks in porous materials under compression is a great challenge and has been the subject of several investigationsin different fields, from earthquake science, rock mechanics to avalanche research[1]. Yet, the conditions for the nucleation of anticracks still remain poorly known, especially under mixed-mode loading.In this study, we have conducted DEMsimulations of very loose, cohesive, granular assemblies with initial configurations which are drawn from Baxter’s stick

The stress and strain relationship in the gauge region of six cruciform geometries is studied: the ISO standard geometry with slits in arms, two geometries with thinned gauge areas, two geometries with thinned gauge areas and slits in arms, and one modifie ...

This study aims to quantify slab contributions in EBFs by investigating the dynamic performance of two 3-story EBF configurations with and without concrete slabs: one configuration having long (flexural yielding) links and the other having shorter (shear yielding) links. Particular effort is spent investigating the relative accumulation of ultra low-cycle fatigue damage within the link regions during dynamic loading. All slab and frame geometries are modeled using shell elements. Linear springs and nodal co

A study of non-anchored tanks found in Switzerland (Koller, 2003) revealed that the plastic rotation of the shell-to-bottom connection in four of the six tanks studied did not satisfy the 0.2 radians limit established by the Eurocode (Eurocode-8, 2005). The fact that tanks could undergo fracture in their shell-to-bottom connection prompted further investigation with funding from Carbura and OFEV. The investigation focused on determining the real capacity of the shell-to-bottom connection since the current l

A new Room Temperature (RT) 0-level vacuum package is demonstrated in this work, using amorphous silicon (aSi) as sacrificial layer and SiO2 as structural layer. The process is compatible with most of MEMS resonators and Resonant Suspended-Gate MOSFET [1] fabrication processes. This paper presents a study on the influence of releasing hole dimensions on the releasing time and hole clogging. It discusses mass production compatibility in terms of packaging stress during back-end plastic injection process. The

Thick film deposition of conductive, dielectric and resistive pastes on ceramic membranes is a cost effective technique to manufacture piezoresistive pressure sensors. Thick-film resistors consist of a percolating network of conductive oxide nanoparticles dispersed in an insulating glassy matrix, the electrical properties of which depend on firing conditions and composition. Ceramic membranes are appropriate to withstand the firing temperatures of thick-film materials, which are about 850°C. However brittle

Chemical inertness and corrosion resistance make ceramic materials appropriate for Micro Electro-Mechanical Systems (MEMS) when aiming for sensing applications at high temperature or in harsh environment. Besides the usual fabrication techniques, such as powder-injection moulding, applied for macro structures, new methods were recently developed based on the use of liquid precursors for engineering of ceramic MEMS. Microinjection and photopolymerisation of e.g. Polyureasilazane (a precursors for SiC and Si-

Rotational molding

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Spontaneously Pyro- and Piezoelectric Polymer Thin Films Generated by Surface-initiated Polymerization

Composite Proton Exchange Membranes with Interlayer Structure Containing Functional Catalyst Particles for Water Electrolysis

A methodology for microstructural evaluation of unsaturated flow phenomena by in‐situ UV‐flow freezing

Micromechanical controls of mixed-mode anticrack nucleation in porous solids: application to snow failure

Universal features of anticrack nucleation in porous solids

Stresses and Strains in Cruciform Samples Deformed in Tension

Effect of Slab Stiffness on EBF Link Rotation Demands and Implications for Link Ultra Low-Cycle Fatigue Susceptibility

Seismic Behavior of Shell-to-Base Connections in Large Storage Tanks

0-level Vacuum Packaging RT Process for MEMS Resonators

Development of pressure sensors by powder technology

Surface micromachining of Ceramic-MEMS based on SU-8 micromoulding of Polyureasilazane