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检索条件"任意字段=IUTAM Symposium on Multi-Functional Material Structures and Systems"

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multi-scale structural integrity assessment of a series of identical components in cultural-heritage structures: The case of the Clifton suspension bridge 8th

Multi-scale structural integrity assessment of a series of i...

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8th International symposium on Life-Cycle Civil Engineering, IALCCE 2023

作者： De Risi, R. Moody, T. Voyagaki, E. Gunner, S. Pregnolato, M. Grilli, N. Taylor, C. University of Bristol Bristol United Kingdom

ISBN: (纸本)9781003323020

Cultural-heritage structures may be characterised by structural elements that are geometrically identical for cosmetic or functional reasons but can be subjected to a significant variable stress distribution because they are located in different positions on the structural system. This can lead to a variety of damage and failure phenomena that will probably occur asynchronously. Damage occurrence triggers discussions among the stakeholders and decision-makers. For heritage structures, repair and restoration actions are costly and constrained by laws regulating grade-listed systems. Therefore, it becomes imperative to understand if such actions are necessary and to identify the most suitable intervention. The research question is: how can future maintenance costs be minimised while preserving the historical value of legacy structures? The answer lies in the reduction of uncertainties using a multi-scale approach that combines: (a) multi-scale knowledge of the material nature and fabrication, (b) multi-scale empirical evidence on material mechanical properties, (c) detailed geometrical description of the system, and (d) multi-scale numerical models. The challenge is finding the optimal trade-off between maintenance and historical value. Such a multi-scale framework is applied to the parapet stanchions of the Clifton Suspension Bridge in Bristol, UK. Stanchions are vertical cast-iron structural elements providing: (a) lateral support to parapets and anti-climb barriers and (b) partial support to the maintenance under-deck gantry. There are 162 identical parapet stanchions on the bridge. These structural elements may suffer heavy damage due to wear and tear. The damage consists of cracking in zones of stress concentration. This damage is unrepairable, and stanchions must be replaced when cracks appear. Their substitution is operated by the Clifton Suspension Bridge Trust (CSBT), which is particularly interested in science and technology for conservation and awareness. B

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Experimental study on stress recovery behavior of Fe-SMA subjected to multi-activation 8th

Experimental study on stress recovery behavior of Fe-SMA sub...

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8th International symposium on Life-Cycle Civil Engineering, IALCCE 2023

作者： Yu, Q.Q. Chen, Z.Y. Gu, X.L. Xiao, X.W. Zhang, W.P. An, Y.H. Ministry of Education Shanghai China Tongji University Shanghai China Guangxi University Guangxi China

ISBN: (纸本)9781003323020

Shape memory alloy (SMA) has shown great promise in retrofitting of aged infrastructure because it could be employed to conveniently apply prestress. However, the stress recovery behavior of iron-based SMA (Fe-SMA) has not been fully understood. This study presents an experimental study on Fe-SMA subjected to multi-activation. Eight specimens were prepared and loaded by two million cyclic loading simultaneously with thermal scenarios. Afterward, they were re-activated up to four times. Lost recovery stress due to fatigue was pronouncedly retrieved by reactivation. In addition, the Fe-SMA samples after fatigue loading could be reused to provide prestress for other applications but the count for reusability was limited. This study explores functional-fatigue behavior of the material and provides some useful suggestions for the strengthening technique. © 2023 The Author(s).

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Application of 3D Printed Vacuum-Actuated Module with multi-soft material to Support Handwork Rehabilitation 16th

Application of 3D Printed Vacuum-Actuated Module with Multi-...

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16th International symposium on Distributed Autonomous Robotic systems (DARS)

作者： Abe, Shoma Ogawa, Jun Watanabe, Yosuke Shiblee, M. D. Nahin Islam Kawakami, Masaru Furukawa, Hidemitsu Yamagata Univ Jonan 4-3-16 Yonezawa Yamagata 9928510 Japan

ISBN: (纸本)9783031537035;9783031514975;9783031514968

Soft modular robotics is a research field that pursues body flexibility while maintaining reconfigurability by employing flowable or soft materials as the main constituent materials of modular robots. In soft modular robotics, a hollow structure made of silicone is created, and the inside of the structure is pressurized to generate stretching and bending motions as an actuator module. In general, it is important to design modular robots with reconfigurability, various deformability, and environmental adaptability. Modularization of soft actuators with reconfigurable and diverse deformability allows morphology to be tailored to the desired task. We have developed a soft actuator module, MORIA, that combines hollow silicone and 3D printable deformable structures (uniaxial shrinking, bending, shearing, uniform contracting, and no deformation). This study proposes a functional extension of the module "MORI-A FleX" for application as a wearable device for physical rehabilitation using this MORI-A module. Our MORI-A FleX connector is a thermoplastic polyurethane flexible connector that can be coated with materials that offer different textures to achieve excellent connectivity and texture variation. We have assembled MORI-A Flex as a rehabilitation device for hand work, assisting the fingers to move harmoniously and enabling them to grasp a slippery, brittle half-boiled egg and a PET bottle containing 200 ml of water in a deactivated state.

关键词： 3D printing soft robotics pneumatic actuator modular robotics wearable device

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multi-functional Composite RF Four-Way Switch

Multi-Functional Composite RF Four-Way Switch

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IEEE-MTT-S International Microwave symposium (IMS)

作者： Beziuk, Grzegorz Baum, Thomas C. Ghorbani, Kamran Nicholson, Kelvin J. RMIT Univ Sch Engn Melbourne Vic Australia DST Grp Melbourne Vic Australia

ISBN: (纸本)9781728113098

This paper describes the design and fabrication of an active four-port microwave switching network embedded into a multi-layer aerospace composite structure. The multi-functional design is based on three broadband Integrated Device Technology (IDT) F2972 single-pole-double-throw (SP2T) RF switches and also includes a control and power supply circuit. The composite structure has been developed using a pre-impregnated structural glass material (Hexcel HexPly 914E). The conductive tracks of the switch and its ground plane have been fabricated using a non-woven carbon-nickel-copper veil material and a semi-flexible conducting silver ink. The manufacturing was also based on a hybrid manufacturing approach. The conductive veil was transferred onto the un-cured pre-preg material using a laser ablation method. Post-curing, the flexible silver ink was printed onto the surface to create the control circuits. The RF performance of the design has been evaluated and indicates the overall performance was consistent with measured S-parameters of the same circuit fabricated on Rogers 5880 substrate.

关键词： composites multifunctional structures pregtronics electronic switching systems

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multi-scale 3D printing of bioinspired structures with functional surfaces

Multi-scale 3D printing of bioinspired structures with funct...

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2018 International symposium on Flexible Automation, ISFA 2018

作者： Li, Xiangjia Chen, Yong Department of Industrial and Systems Engineering University of Southern California Los AngelesCA90089 United States

Nature provides inspirations of creative multi-functional materials and structures. However, biological systems are usually composed of materials and structures in multi-scales with high geometry complexity, which brings challenges to bioinspired design and fabrication. Additive manufacturing (AM) presents a potential solution due to its capability of creating three-dimensional (3D) objects with freeform surface and multi-materials. The aim of this research is to investigate the fabrication of multi-scale biomimetic structures using the integrated photo-polymerization based 3D printing processes. We firstly introduced the macro- and meso-scale mask image projection based stereolithography (MIP-SL). We then present the micro-scale immersive surface accumulation (ISA) printing. Based on them, a multi-scale 3D printing method by integrating the ISA and MIP-SLA processes is presented. To achieve high-resolution fabrication, the process planning, the material curing performance, and the printing parameters are discussed. Two test cases are presented to demonstrate its fabrication capability. The experimental results verify the accuracy and efficiency of the developed multi-scale 3D printing method on the fabrication of bioinspired structures with functional surfaces. Copyright © 2018 by ISFA.

关键词： 3D printers

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iutam symposium on multi-functional material structures and systems - Proceedings of the iutam symposium on multi-functional material structures and systems

IUTAM Symposium on Multi-Functional Material Structures and ...

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iutam symposium on multi-functional material structures and systems

ISBN: (纸本)9789048137701

The proceedings contain 35 papers. The topics discussed include: a strain sensor from a polymer/carbon nanotube nanocomposite;a hysteresis compensator based on a modified dynamic preisach model for conductive polymer nanocomposites;multi-axial behavior of ferroelectrics with two types of micro-macromechanical models;active single walled carbon nanotube-polymer composites;modeling of fibre formation and oxygen permeability in micro-fibrillar polymer-polymer composites;multiscale computational analysis of biomechanical systems;effect of magnetic-field on stress-strain behavior of magneto-sensitive elastomers;effects of functionalization on the morphology, cure kinetics and mechanical behavior of thermosetting polymers;a study on polarization-electric field nonlinearity in smart composite structures;and multifunctional components in sodium cooled fast reactor: design and development.

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RevoMaker: Enabling multi-directional and functionally-embedded 3D Printing using a Rotational Cuboidal Platform 15

RevoMaker: Enabling Multi-directional and Functionally-embed...

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28th Annual ACM symposium on User Interface Software and Technology (UIST)

作者： Gao, Wei Zhang, Yunbo Nazzetta, Diogo C. Ramani, Karthik Cipra, Raymond J. Purdue Univ Sch Mech Engn W Lafayette IN 47907 USA

ISBN: (纸本)9781450337793

In recent years, 3D printing has gained significant attention from the maker community, academia, and industry to support low-cost and iterative prototyping of designs. Current unidirectional extrusion systems require printing sacrificial material to support printed features such as overhangs. Furthermore, integrating functions such as sensing and actuation into these parts requires additional steps and processes to create "functional enclosures", since design functionality cannot be easily embedded into prototype printing. All of these factors result in relatively high design iteration times. We present "RevoMaker", a self-contained 3D printer that creates direct out-of-the-printer functional prototypes, using less build material and with substantially less reliance on support structures. By modifying a standard low-cost FDM printer with a revolving cuboidal platform and printing partitioned geometries around cuboidal facets, we achieve a multidirectional additive prototyping process to reduce the print and support material use. Our optimization framework considers various orientations and sizes for the cuboidal base. The mechanical, electronic, and sensory components are pre-assembled on the flattened laser-cut facets and enclosed inside the cuboid when closed. We demonstrate RevoMaker directly printing a variety of customized and fully-functional product prototypes, such as computer mice and toys, thus illustrating the new affordances of 3D printing for functional product design.

关键词： multi-directional 3D printing functional product design

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How can material jetting systems be upgraded for more efficient multi-material additive manufacturing? 25

How can material jetting systems be upgraded for more effici...

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25th Annual International Solid Freeform Fabrication symposium " An Additive Manufacturing Conference, SFF 2014

作者： Baumers, M. Tuck, C. Dickens, P. Hague, R. Faculty of Engineering University of Nottingham NottinghamNG7 2RD United Kingdom

multi-material Additive Manufacturing (AM) platforms are able to build up components from multiple materials in a single layer-by-layer process. It is expected that this capability will enable the manufacturing of functional structures within products, such as conductive tracks or optical pathways, resulting in radically novel products with unprecedented degrees of functional density. An important variant of commercially available multi-material AM technology is material jetting, which is currently in commercial use for the manufacture of prototypes and design studies. This paper presents a detailed process model of build-time, energy consumption and production cost for the Stratasys Objet 260 Connex system, analyzing the contemporaneous deposition of two different types of photopolymers (Veroclear RGD810 and Tangoblack FLX973). By using this process model to anticipate the effects of various upgrades to the investigated system, such as a larger build volume and a higher deposition speed, this forward-looking paper explores pathways to enhancing the value proposition of such multi-material systems through incremental technology improvement. © SFF *** rights reserved.

关键词： Deposition

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Patterning of multi-leveled microstructures on flexible polymer substrate using roll-to-roll ultraviolet nanoimprint lithography

Patterning of multi-leveled microstructures on flexible poly...

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IEEE/CHMT(CPMT) International Electronics Manufacturing Technology symposium

作者： Nazrin Kooy Norian Rahman Khairudin Mohamed Nanofabrication and Functional Materials Research Group School of Mechanical Engineering Universiti Sains Malaysia Nibong Tebal Penang Malaysia

ISBN: (纸本)9781467343848

The recent developments of flexible electronics, biochips, optical devices and micro/nano-electro-mechanical-systems (MEMS/NEMS) have featured various complex three-dimensional or multileveled micro/ nano structures in its designs. However, fabricating these structures using the existing technologies such as photolithography and electron beam lithography (EBL) are time consuming and involved high process costs. Nevertheless, the production of these microstructures at high volume manufacturing scale has led to the demand for a simpler, low-coat and high-throughput technique for patterning process. In the present work, multi-level microstructures (3-levels) with minimum feature size of approximately 50 μm are continuously patterned onto flexible polymer substrate using in-house designed roll-to-roll ultraviolet nanoimprint lithography (R2R-UV-NIL) system. Using a commercially available 50μm-thick polyethylene terephthalate (PET) film as the flexible substrate and SU8-2002 photopolymer as the imprint resist, continuous patterning of the multi-level structures has been demonstrated at speed of 100 mm/min using R2R-UV-NIL imprinting tool. Ten imprints were produced consecutively, where the confocal laser scanning microscopy (CLSM) measurements of the imprints demonstrated the potential of the R2R-UV-NIL technique to replicate multi-level structures, albeit the pattern waviness or plane flatness issue due to the deformation of the soft PDMS mold. With further process optimization and usage of a harder mold material, the R2R-UV-NIL is a promising technique and tool for fabricating complex 3D and multi-level microstructures on flexible substrate for future applications.

关键词： substrate microstructures applications

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Manufacturing of multi-functional Composites

Manufacturing of Multi-functional Composites

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iutam symposium on multi-functional material structures and systems

作者： Potluri, Prasad Young, Robert J. Univ Manchester Sch Mat Manchester M60 1QD Lancs England

ISBN: (纸本)9789048137701

This paper investigates the manufacturing routes for multi-functional materials. multi-functionality includes functions such as sensing, actuation, heating, cooling, thermal conductivity, camouflage and stealth, in addition to load bearing. Composites have a distinct advantage in incorporating multi-functionality at the material scale. Dry fibre preforming has been identified as a key enabling technology for incorporating multifunctional elements into a fibre assembly before the resin is injected. This paper also investigates non-contact measuring techniques such as wireless sensing and Raman spectroscopy.

关键词： 3D Weaving Non-contact sensing Raman Spectroscopy Sensor integration

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