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Digital image correlation. --- Correlation, Digital image --- DIC (Digital image correlation) --- Image processing --- Nondestructive testing --- Digital techniques

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Advanced engineering demands materials that are stronger, tougher, and lighter, exceeding the capabilities of conventional materials. This has led to the exploration of innovative design approaches, particularly through the use of cellular solids. These materials achieve a desirable balance of strength and lightness through intricate lattice designs composed of solid struts forming the edges or faces of individual cells. Lattice structure, a prominent subset of cellular solids, feature repeating and interconnected structures which can be inspired by the strategic porosity found in biological materials. This engineered porosity significantly enhances their mechanical properties. A key application of lattice structure, relevant to this research, is in tissue engineering scaffolds, where open-cell lattice structures promote cell infiltration and migration, crucial for effective tissue regeneration.The advancement of additive manufacturing techniques, such as PolyJet 3D printing, has enabled the creation of architectured materials. These materials integrate individual constituents with varying mechanical properties at the mesoscale into spatial arrangements optimized for mechanical performance. Drawing inspiration from the evolutionary design principles found in biological tissue, these architectured structures often exhibit superior properties compared to their individual components. In this study, we utilize multimaterial PolyJet 3D printing to fabricate cellular solids with beams featuring a hybrid sandwich-like design to enhance mechanical efficiency and, more specifically, energy absorption. We investigate the flexural behavior of these struts in two configurations: core-shell (C-S) and core-interface-shell (C-I-S), using 3-point bending tests combined with Digital Image Correlation (DIC). The core is composed of a rubbery material (Shore95,Young’s modulus ∼ 100 [MPa]), while the faces are made from a rigid glassy material (VeroWhitePlus, Young’s modulus ∼ 2 [GPa]), and the interface are made of a softer material (TangoBlackPlus, Young’s modulus ∼ 1 [MPa]). Additionally, we examine how the printing orientation influences the behavior of the composites due to differences in the interface connecting two materials: when printed horizontally bimaterial interfaces are sharp (i.e. less than 20 µm in width), whereas printed vertically, internal interfaces are rather blurred (i.e. around 150 µm in width). Our findings indicate a 30% increase in energy absorption for small core-to-strut thickness ratios compared to monolithic beams. Different core-to-strut thickness ratios result in varying failure modes, including complete brittle failure or delamination. The addition of an interface slightly decreases performance, except at an intermediate ratio of c/t = 0.2, where blurred interfaces reduce delamination and enhance flexural strength. For thicker soft layers, a blurred interface achieved by vertical printing is advantageous, while for thinner layers, a sharp interface achieved by horizontal printing is preferable. The study further explores the energy absorption capacity of 3D-printed triply periodic minimal surface (TPMS) gyroid lattices with composite cell walls, designed based on results of the first part of the thesis, under in-plane compression. Results reveal that the composite TPMS gyroid retains the performance characteristics of its individual stiff material but also demonstrates improved deformation recovery compared to the individual stiff consitutent.

Cellular solids --- Tissue Engineering Scaffolds --- Additive Manufacturing --- PolyJet 3D printing --- Architectured Materials --- Digital Image Correlation --- Triply Periodic Minimal Surface (TPMS) --- Ingénierie, informatique & technologie > Ingénierie mécanique --- Ingénierie, informatique & technologie > Multidisciplinaire, généralités & autres

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This volume offers a guide to the state of the art in the fast evolving field of biometric recognition to newcomers and experienced practitioners. It is focused on the emerging strategies to perform biometric recognition under uncontrolled data acquisition conditions. The mainstream research work in this field is presented in an organized manner, so the reader can easily follow the trends that best suits her/his interests in this growing field. The book chapters cover the recent advances in less controlled / covert data acquisition frameworks, segmentation of poor quality biometric data, biometric data quality assessment, normalization of poor quality biometric data. contactless biometric recognition strategies, biometric recognition robustness, data resolution, illumination, distance, pose, motion, occlusions, multispectral biometric recognition, multimodal biometrics, fusion at different levels, high confidence automatic surveillance.

Biometric identification. --- Image processing. --- Signal processing. --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Electrical Engineering --- Digital image correlation. --- Correlation, Digital image --- DIC (Digital image correlation) --- Biometric person authentication --- Biometrics (Identification) --- Biometrics. --- Signal, Image and Speech Processing. --- Security Science and Technology. --- Image processing --- Nondestructive testing --- Anthropometry --- Identification --- Digital techniques --- Speech processing systems. --- Biometrics (Biology). --- System safety. --- Safety, System --- Safety of systems --- Systems safety --- Accidents --- Industrial safety --- Systems engineering --- Biological statistics --- Biology --- Biometrics (Biology) --- Biostatistics --- Biomathematics --- Statistics --- Computational linguistics --- Electronic systems --- Information theory --- Modulation theory --- Oral communication --- Speech --- Telecommunication --- Singing voice synthesizers --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing --- Processing, Signal --- Information measurement --- Signal theory (Telecommunication) --- Prevention --- Statistical methods

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This Special Issue consists of selected papers from the Experimental Stress Analysis 2020 conference. Experimental Stress Analysis 2020 was organized with the support of the Czech Society for Mechanics, Expert Group of Experimental Mechanics, and was, for this particular year, held online in 19–22 October 2020. The objectives of the conference included identification of current situation, sharing professional experience and knowledge, discussing new theoretical and practical findings, and the establishment and strengthening of relationships between universities, companies, and scientists from the field of experimental mechanics in mechanical and civil engineering. The topics of the conference were focused on experimental research on materials and structures subjected to mechanical, thermal–mechanical, and dynamic loading, including damage, fatigue, and fracture analyses. The selected papers deal with top-level contemporary phenomena, such as modern durable materials, numerical modeling and simulations, and innovative non-destructive materials’ testing.

Technology: general issues --- History of engineering & technology --- residual stresses --- neutron diffraction --- three axis setting --- high resolution --- bent crystal monochromator --- bent crystal analyzer --- stainless steel 316L --- additive manufacturing --- multiaxial loading --- plasticity --- digital image correlation method --- hill yield criterion --- isotropic hardening --- finite element method (FEM) --- straightening process --- three-point bending --- FEM --- control strategy --- billet straightening --- multiaxial fatigue --- high-cycle fatigue --- multiaxial fatigue experiments --- S-N curve approximation --- laser welding --- pressure vessel steel --- microstructure --- X-ray and neutron diffraction --- high-cycle fatigue tests --- wearable --- flexible --- structure --- stiffness --- biomedical --- mechanics --- simulation --- pattern --- 3D print --- PA12 --- tram --- pedestrian --- crash --- windshield model --- HIC --- hole-drilling --- PhotoStress --- digital image correlation --- experimental analysis --- finite element analysis --- composite --- thermoplastic --- interlaminar strength --- polyphenylensulfid --- polyetheretherketone --- polyaryletherketone --- curved beam --- NDE --- infrared thermography --- Infrared Nondestructive Testing --- CFRP --- Anand material model --- material parameters --- ABS-M30 --- indentation test --- genetic algorithm --- acoustic emission --- CFRP composite tube --- unsupervised learning approach --- failure mechanism --- n/a

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This Special Issue consists of selected papers from the Experimental Stress Analysis 2020 conference. Experimental Stress Analysis 2020 was organized with the support of the Czech Society for Mechanics, Expert Group of Experimental Mechanics, and was, for this particular year, held online in 19–22 October 2020. The objectives of the conference included identification of current situation, sharing professional experience and knowledge, discussing new theoretical and practical findings, and the establishment and strengthening of relationships between universities, companies, and scientists from the field of experimental mechanics in mechanical and civil engineering. The topics of the conference were focused on experimental research on materials and structures subjected to mechanical, thermal–mechanical, and dynamic loading, including damage, fatigue, and fracture analyses. The selected papers deal with top-level contemporary phenomena, such as modern durable materials, numerical modeling and simulations, and innovative non-destructive materials’ testing.

Technology: general issues --- History of engineering & technology --- residual stresses --- neutron diffraction --- three axis setting --- high resolution --- bent crystal monochromator --- bent crystal analyzer --- stainless steel 316L --- additive manufacturing --- multiaxial loading --- plasticity --- digital image correlation method --- hill yield criterion --- isotropic hardening --- finite element method (FEM) --- straightening process --- three-point bending --- FEM --- control strategy --- billet straightening --- multiaxial fatigue --- high-cycle fatigue --- multiaxial fatigue experiments --- S-N curve approximation --- laser welding --- pressure vessel steel --- microstructure --- X-ray and neutron diffraction --- high-cycle fatigue tests --- wearable --- flexible --- structure --- stiffness --- biomedical --- mechanics --- simulation --- pattern --- 3D print --- PA12 --- tram --- pedestrian --- crash --- windshield model --- HIC --- hole-drilling --- PhotoStress --- digital image correlation --- experimental analysis --- finite element analysis --- composite --- thermoplastic --- interlaminar strength --- polyphenylensulfid --- polyetheretherketone --- polyaryletherketone --- curved beam --- NDE --- infrared thermography --- Infrared Nondestructive Testing --- CFRP --- Anand material model --- material parameters --- ABS-M30 --- indentation test --- genetic algorithm --- acoustic emission --- CFRP composite tube --- unsupervised learning approach --- failure mechanism --- residual stresses --- neutron diffraction --- three axis setting --- high resolution --- bent crystal monochromator --- bent crystal analyzer --- stainless steel 316L --- additive manufacturing --- multiaxial loading --- plasticity --- digital image correlation method --- hill yield criterion --- isotropic hardening --- finite element method (FEM) --- straightening process --- three-point bending --- FEM --- control strategy --- billet straightening --- multiaxial fatigue --- high-cycle fatigue --- multiaxial fatigue experiments --- S-N curve approximation --- laser welding --- pressure vessel steel --- microstructure --- X-ray and neutron diffraction --- high-cycle fatigue tests --- wearable --- flexible --- structure --- stiffness --- biomedical --- mechanics --- simulation --- pattern --- 3D print --- PA12 --- tram --- pedestrian --- crash --- windshield model --- HIC --- hole-drilling --- PhotoStress --- digital image correlation --- experimental analysis --- finite element analysis --- composite --- thermoplastic --- interlaminar strength --- polyphenylensulfid --- polyetheretherketone --- polyaryletherketone --- curved beam --- NDE --- infrared thermography --- Infrared Nondestructive Testing --- CFRP --- Anand material model --- material parameters --- ABS-M30 --- indentation test --- genetic algorithm --- acoustic emission --- CFRP composite tube --- unsupervised learning approach --- failure mechanism