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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Civil engineering, surveying & building --- Environmental science, engineering & technology --- Structural analysis --- Computational mechanics --- Numerical algorithms --- Finite Element Method (FEM) --- Boundary Element Method (BEM)

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This work presents a numerical FEM framework, capable of predicting SOFC performance under technically relevant, planar stack contacting conditions. A high level of confidence in the model predictions is supplied by using exclusively experimentally determined material/kinetic parameters and by a comprehensive validation. The presented model aids SOFC stack development by pre-evaluating possible material choices and design combinations for cells/interconnectors without any experimental effort.

Finite Element Method (FEM) simulation --- Solid Oxide Fuel Cell (SOFC) --- Hochtemperatur Festoxid-Brennstoffzelle (SOFC) --- anode supported cell (ASC) --- Finite Elemente Methode (FEM) Simulation --- mischleitende (MIEC) Kathode --- mixed-ionic-electronic conductive (MIEC) cathode --- anodengestützte Zelle (ASC)

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The advent of additive manufacturing (AM) processes applied to the fabrication of structural components creates the need for design methodologies supporting structural optimization approaches that take into account the specific characteristics of the process. While AM processes enable unprecedented geometrical design freedom, which can result in significant reductions of component weight, on the other hand they have implications in the fatigue and fracture strength due to residual stresses and microstructural features. This is linked to stress concentration effects and anisotropy that still warrant further research. This Special Issue of Applied Sciences brings together papers investigating the features of AM processes relevant to the mechanical behavior of AM structural components, particularly, but not exclusively, from the viewpoints of fatigue and fracture behavior. Although the focus of the issue is on AM problems related to fatigue and fracture, articles dealing with other manufacturing processes with related problems are also be included.

milling process --- part functionality --- surface integrity --- research progress --- non-proportional mixed mode loading --- fractography --- mode II stress intensity factor --- finite element analysis --- rail steel --- wheel steel --- monolithic zirconia crown --- dental implant abutment --- cyclic loading --- mode III stress intensity factor --- FEA --- adaptive control --- fatigue testing --- simply supported bending --- mini specimen --- additive manufacturing --- 304L stainless steel --- LCF --- crack propagation --- blade-disc-Franc3D --- mixed-mode cracking --- fatigue life improvement --- materials characterization --- ultrasonic impact treatment --- DMLS --- fatigue --- fracture --- finite element method (FEM)

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Modern medicine is now more oriented towards patient-based treatments. Taking into account individual biological features allows for increasing the quality of the healing process. Opportunities for modern hardware and software allow not only the complex behavior of implants and prostheses to be simulated, but also take into account any peculiarities of the patient. Moreover, the development of additive manufacturing expands the opportunities for materials. Technical limits for composite materials, biomaterials, and metamaterials are decreasing. On the other hand, there is a need for more detailed analyses of biomechanics research. A deeper understanding of the technological processes of implants, and the mechanobiological interactions of implants and organisms will potentially allow us to raise the level of medical treatment. Modern trends of the biomechanics of contemporary implants and prostheses, including experimental and mathematical modeling and clinical application, are discussed in this book.

Technology: general issues --- History of engineering & technology --- structural design --- porous constructions --- additive manufacturing --- CT --- strength --- computer simulation --- finite element analysis --- implant --- pelvis --- walking --- mouthguard --- occlusal contact --- friction --- teeth --- Tresca stress --- metal-on-metal --- total hip arthroplasty --- normal walking activity --- knee joint --- patello-femoral joint --- kinematics --- cardan sequence --- euler angles --- conversion --- biomechanics --- hip replacement --- short stems --- custom-made medical devices --- strain shielding --- hemodynamics --- modified Blalock–Taussig shunt --- hyperelasticity --- anisotropy --- fluid–structure interaction --- dental prosthesis --- porcelain fused to metal --- metal-ceramic --- adhesion --- profilometry --- plasma-electrolyte processing --- shear strength --- TMJ --- biomaterials --- custom devices --- 3D models --- mandibles --- tooth --- NCCL --- contact --- modeling --- finite element method (FEM) --- strain --- glenoid implant --- implant development --- 3D modelling --- abrasion test --- glenoid defect

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In this book, modern trends in testing and simulating heterogeneous welded joints, including multi-scale approaches, resulting in appropriate flaw assessment procedures, are highlighted and discussed. The eleven research papers presented in this book give some overview of recent analytical, numerical, and experimental investigations in the field of yield strength mismatched welded joint behaviour. The papers cover several important issues to more accurately characterise the fracture mechanics behaviour and structural integrity assessments.

welding --- distortion --- stamping --- model --- prediction --- actual stress–strain diagram --- undermatching weld --- martensitic steel --- DIC --- FEM --- welded joint --- finite element method (FEM) --- multiple defects --- stress concentration --- weld metals --- welded joints --- damage mechanics --- finite element analysis --- crack growth --- ductile fracture --- Al7075 --- TC4 --- contact reactive brazing --- Cu deposited --- creep --- C* integral --- mismatched weld --- CT specimen --- yield load --- heterogeneous weld --- numerical analysis --- SE(B) specimen --- metal weld --- strength mismatch --- fracture --- plastic correction factors --- fixture rollers --- J-R resistance curve --- refinery --- piping --- API 5L X80 steel --- nonlinear strength analyses --- cleavage fracture stress --- medium carbon forging steel --- microalloyed steel --- acicular ferrite --- heterogeneous microstructure --- crack-initiation energy --- crack-propagation energy --- fracture toughness