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Micromechanical finite element simulations of crack propagation in silicon nitride

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Book Series: Schriftenreihe Kontinuumsmechanik im Maschinenbau / Karlsruher Institut für Technologie, Institut für Technische Mechanik - Bereich Kontinuumsmechanik ISSN: 2192693X ISBN: 9783866448186 Year: Volume: 3 Pages: 140 p. DOI: 10.5445/KSP/1000026004 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
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Silicon nitride is used for challening applications like cutting inserts or forming rolls. The extreme strength and toughness of the material is achieved by an interaction between the microstructure and fracture behaviour on the microlevel. In order to understand these mechanisms, detailed unit cells have been defined and used for the determination of the effective fracture properties. The results have been used for the implementation of an effective continuum damage mechanics model.

Finite element simulation of dislocation based plasticity and diffusion in multiphase materials at high temperature

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Book Series: Schriftenreihe Kontinuumsmechanik im Maschinenbau / Karlsruher Institut für Technologie, Institut für Technische Mechanik - Bereich Kontinuumsmechanik ISSN: 2192693X ISBN: 9783731509189 Year: Volume: 14 Pages: X, 197 p. DOI: 10.5445/KSP/1000092297 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:01
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A single-crystal plasticity model as well as a gradient crystal plasticity model are used to describe the creep behavior of directionally solidi?ed NiAl based eutectic alloys. To consider the transition from theoretical to bulk strength, a hardening model was introduced to describe the strength of the reinforcing phases. Moreover, to account for microstructural changes due to material ?ux, a coupled diffusional-mechanical simulation model was introduced.

Modelling and Simulation of Sheet Metal Forming Processes

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ISBN: 9783039285563 / 9783039285570 Year: Pages: 254 DOI: 10.3390/books978-3-03928-557-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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The numerical simulation of sheet metal forming processes has become an indispensable tool for the design of components and their forming processes. This role was attained due to the huge impact in reducing time to market and the cost of developing new components in industries ranging from automotive to packing, as well as enabling an improved understanding of the deformation mechanisms and their interaction with process parameters. Despite being a consolidated tool, its potential for application continues to be discovered with the continuous need to simulate more complex processes, including the integration of the various processes involved in the production of a sheet metal component and the analysis of in-service behavior. The quest for more robust and sustainable processes has also changed its deterministic character into stochastic to be able to consider the scatter in mechanical properties induced by previous manufacturing processes. Faced with these challenges, this Special Issue presents scientific advances in the development of numerical tools that improve the prediction results for conventional forming process, enable the development of new forming processes, or contribute to the integration of several manufacturing processes, highlighting the growing multidisciplinary characteristic of this field.

MEMS Technology for Biomedical Imaging Applications

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ISBN: 9783039216048 9783039216055 Year: Pages: 218 DOI: 10.3390/books978-3-03921-605-5 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 11:49:16
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Biomedical imaging is the key technique and process to create informative images of the human body or other organic structures for clinical purposes or medical science. Micro-electro-mechanical systems (MEMS) technology has demonstrated enormous potential in biomedical imaging applications due to its outstanding advantages of, for instance, miniaturization, high speed, higher resolution, and convenience of batch fabrication. There are many advancements and breakthroughs developing in the academic community, and there are a few challenges raised accordingly upon the designs, structures, fabrication, integration, and applications of MEMS for all kinds of biomedical imaging. This Special Issue aims to collate and showcase research papers, short commutations, perspectives, and insightful review articles from esteemed colleagues that demonstrate: (1) original works on the topic of MEMS components or devices based on various kinds of mechanisms for biomedical imaging; and (2) new developments and potentials of applying MEMS technology of any kind in biomedical imaging. The objective of this special session is to provide insightful information regarding the technological advancements for the researchers in the community.

Keywords

tilted microcoil --- electromagnetically-driven --- surface micromachining --- polyimide capillary --- MEMS --- ego-motion estimation --- indoor navigation --- monocular camera --- scale ambiguity --- wearable sensors --- photoacoustic --- microelectromechanical systems (MEMS) --- miniaturized microscope --- lead-free piezoelectric materials --- high frequency ultrasonic transducer --- needle-type --- high spatial resolution --- ultrahigh frequency ultrasonic transducer --- Si lens --- tight focus --- finite element simulation --- low noise amplifier (LNA) --- noise figure --- smart hydrogels --- bio-sensors --- chemo-sensor --- electrochemical sensors --- transduction techniques --- near-field microwave --- microwave resonator --- microwave remote sensing --- potentiometric sensor --- gold nanoparticles --- metal oxide field-effect transistor --- chemo-FET --- bio-FET --- photoacoustic imaging --- microelectromechanical systems (MEMS) --- MEMS scanning mirror --- micromachined US transducer --- microring resonator --- acoustic delay line --- MEMS mirror --- Lissajous scanning --- pseudo-resonant --- sensing --- imaging --- display --- MEMS actuators --- microendoscopy --- confocal --- two-photon --- wide-filed imaging --- photoacoustic --- fluorescence --- scanner --- capacitive micromachined ultrasonic transducer (CMUT) --- acoustics --- micromachining --- capacitive --- transducer --- modelling --- fabrication --- 3D Printing --- piezoelectric array --- ultrasonic transducer --- ultrasonic imaging --- micro-optics --- bioimaging --- microtechnology --- microelectromechanical systems (MEMS) --- in vitro --- in vivo --- cantilever waveguide --- electrostatic actuator --- non-resonating scanner --- optical scanner --- push-pull actuator --- rib waveguide --- n/a

Biomaterials for Bone Tissue Engineering

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ISBN: 9783039289653 / 9783039289660 Year: Pages: 244 DOI: 10.3390/books978-3-03928-966-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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Bone tissue engineering aims to develop artificial bone substitutes that partially or totally restore the natural regeneration capability of bone tissue lost under circumstances of injury, significant defects, or diseases such as osteoporosis. In this context, biomaterials are the keystone of the methodology. Biomaterials for bone tissue engineering have evolved from biocompatible materials that mimic the physical and chemical environment of bone tissue to a new generation of materials that actively interacts with the physiological environment, accelerating bone tissue growth. Mathematical modelling and simulation are important tools in the overall methodology. This book presents an overview of the current investigations and recent contributions in the field of bone tissue engineering. It includes several successful examples of multidisciplinary collaboration in this transversal area of research. The book is intended for students, researchers, and professionals of a number of disciplines, such as engineering, mathematics, physics, chemistry, biomedicine, biology, and veterinary. The book is composed of an editorial section and 16 original research papers authored by leading researchers of this discipline from different laboratories across the world

Keywords

Pelvis --- Bone tumor --- 3D-printed implant --- Fixation design --- von Mises stress --- dental implants --- osseointegration --- resonance frequency analysis --- biomaterials --- titanium --- powder metallurgy --- loose sintering --- finite element method --- mechanical behaviour --- bone tissue regeneration --- computed tomography --- Xenografts --- stem cell --- cartilage --- finite element --- finite-element simulation --- electric stimulation --- bone regeneration --- computational modelling --- electrically active implants --- bioelectromagnetism --- critical size defect --- maxillofacial --- minipig --- oxygen delivery --- optimization --- mass transfer --- transport --- bone tissue engineering --- computational fluid dynamics --- Lattice Boltzmann method --- scaffold design --- culturing protocol --- Lagrangian scalar tracking --- cortical bone --- damage --- finite elements --- numerical results --- adipogenesis --- bone marrow --- MSCs --- prediction marker --- bone tissue --- elastoplasticity --- finite element method --- fracture risk --- osteoporosis --- trabeculae --- trabecular bone score --- vertebra --- biomechanics --- finite element modelling --- pelvis --- bone adaptation --- musculoskeletal modelling --- bone tissue engineering --- biomaterials --- computational mechanobiology --- numerical methods in bioengineering --- Ti6Al4V scaffolds --- triply periodic minimal surfaces --- selective laser melting --- additive manufacturing --- biomaterial applications --- finite element analysis --- spark plasma sintering --- wollastonite --- human dental pulp stem cells --- substrate-mediated electrical stimulation --- direct current electric field --- osteo-differentiation --- bone morphogenesis proteins --- cortical bone --- digital image correlation --- multiscale analysis --- micromechanics --- computational mechanics --- cone beam computed tomography --- automatic segmentation --- sliding window --- 3D virtual surgical plan --- Otsu’s method --- n/a

Human Health Engineering

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ISBN: 9783039284085 9783039284092 Year: Pages: 428 DOI: 10.3390/books978-3-03928-409-2 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-04-07 23:07:09
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In this Special Issue on human health engineering, we invited submissions exploring recent contributions to the field of human health engineering, which is the technology used for monitoring the physical or mental health status of individuals in a variety of applications. Contributions focused on sensors, wearable hardware, algorithms, or integrated monitoring systems. We organized the different papers according to their contributions to the main aspects of the monitoring and control engineering scheme applied to human health applications, including papers focusing on measuring/sensing physiological variables, contributions describing research on the modelling of biological signals, papers highlighting health monitoring applications, and finally examples of control applications for human health. In comparison to biomedical engineering, the field of human health engineering also covers applications on healthy humans (e.g., sports, sleep, and stress) and thus not only contributes to develop technology for curing patients or supporting chronically ill people, but also more generally for disease prevention and optimizing human well-being.

Keywords

artefact correction --- head-shaped phantom --- spherical phantom --- gradient artefact --- simultaneous EEG–fMRI --- calcaneal spur --- pain minimum compressive pressure --- contour of shoe insole --- insole foot area --- health information --- interface formats --- older adults --- wearable devices --- usability --- emotional reaction --- ADHD --- screening --- machine learning --- SVM --- children --- novel --- nomophobia --- anxiety --- smartphone --- internet --- cyberaddiction --- new technologies --- chronic obstructive pulmonary disease --- COPD --- oxygen uptake --- VO2 --- kinetics --- exercise testing --- rehabilitation robotics --- soft walking assistive robot --- long-term effect --- gait characteristics --- elderly person --- blood pressure estimation --- photoplethysmogram --- pulse wave --- pulse oximeter --- wearable device --- Kano-TRIZ design theory --- quality function deployment --- four-wheeled rollator --- model predictive control --- orthosis control --- muscle modeling --- arm --- Hill muscle --- swarm optimization --- pneumatic artificial muscle --- sliding mode control --- fractional calculus --- antagonistic actuator --- weight loss --- mHealth --- dynamic model --- adaptive control --- spirometry --- airflow limitation --- airway resistance --- specific airway conductance --- COPD --- body-plethysmography --- forced expiration --- alveolar pressure --- emphysema --- computed tomography --- air-trapping --- thermal comfort --- bicycle helmet --- smart wearables --- adaptive model --- streaming data --- thermal sensation --- adaptive model --- personalized model --- machine leaning --- support-vector-machine --- adaptive control --- streaming algorithm --- thermoregulation --- homeostasis --- cold-induced-vasodilation --- cold-induced-vasoconstriction --- control system --- dynamic modelling --- powered mobility --- dyskinetic cerebral palsy --- dystonia --- choreoathetosis --- mobility scale --- movement disorder --- children --- youth --- reliability --- validity --- feature engineering --- intensive care unit --- mortality prediction --- hard-margin support vector machines --- driver drowsiness --- thermoregulation --- distal skin temperature --- decision tree --- heart model --- Van der Pol --- FitzHugh–Nagumo --- relaxation oscillator --- electrocardiographic signal --- bicycle helmets --- thermal manikin --- convective and evaporative heat loss --- zonal performance characteristics --- freestyle skiing aerials --- knee joint --- ligament --- finite element simulation --- lifting technique --- stoop --- squat --- work-related musculoskeletal disorders --- musculoskeletal modeling --- spine --- shoulder --- back loading --- harmonization --- meta-analysis --- missing data --- multiple imputations --- information technology --- remoteness --- cohort studies --- control parameter reference --- stance assistance --- magnetorheological brake --- body mass index --- walking speed --- ankle torque --- ankle angular velocity --- n/a

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