Statistics for Spatial Data.

and Applications of Fullerenes, Carbon Dots, Nanotubes, Graphene, Nanodiamonds, and Combined Superstructures Vasilios Georgakilas,† Jason A. Perman,‡ Jiri Tucek,‡ and Radek Zboril*,‡ †Material Science Department, University of Patras, 26504 Rio Patras, Greece ‡Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University in Olomouc, 17 listopadu 1192/12, 771 46 Olomouc, Czech Republic

Broad family of carbon nanoallotropes: classification, chemistry, and applications of fullerenes, carbon dots, nanotubes, graphene, nanodiamonds, and combined superstructures.

Research status of laser cladding on titanium and its alloys: A review

https://people.clarkson.edu/~wding/Publications/2005_Carbon.pdf

Mechanical and structural characterization of electrospun PAN-derived carbon nanofibers

Material properties emerge from phenomena on scales ranging from Angstroms to millimeters, and only a multiscale treatment can provide a complete understanding. Materials researchers must therefore understand fundamental concepts and techniques from different fields, and these are presented in a comprehensive and integrated fashion for the first time in this book. Incorporating continuum mechanics, quantum mechanics, statistical mechanics, atomistic simulations and multiscale techniques, the book explains many of the key theoretical ideas behind multiscale modeling. Classical topics are blended with new techniques to demonstrate the connections between different fields and highlight current research trends. Example applications drawn from modern research on the thermo-mechanical properties of crystalline solids are used as a unifying focus throughout the text. Together with its companion book, Continuum Mechanics and Thermodynamics (Cambridge University Press, 2011), this work presents the complete fundamentals of materials modeling for graduate students and researchers in physics, materials science, chemistry and engineering.

Modeling Materials: Continuum, Atomistic and Multiscale Techniques

Surface effects in non-uniform nanobeams: Continuum vs. atomistic modeling

An analytical model is developed for buckling of multiply delaminated composite beams or long plates under cylindrical bending, and their interactive effects are studied. The prebuckling and buckling equations, formulated for one-dimensional cases with an arbitrary configuration of through-the-width cracks, are solved in a closed-form manner. The effects of crack length and location are studied, showing different trends of behavior for global and local mode shapes, including a decrease in the buckling load when cracked zones overlap. In some cases, where inadmissible interlaminar penetration in the first mode is involved, higher eigenvalues and the corresponding eigenmodes are needed to define the buckling state. In other cases, where all eigen modes exhibit penetration, the present model can be used only as indicated for the behavior, and a nonlinear analysis with contact constraints is called for. Considering the scanty work done to-date in the field of multiply delaminated beams, the proposed model-eve...

Buckling of Multiply Delaminated Beams

A laser surface treatment (LST), which enhances fatigue resistance of Titanium 6Al–4V alloy has been studied by 1.8 kW CW–CO 2 Laser. The aim of the study is to find optimal conditions of treatment, which will extend the material resistance to fatigue failure, and explore the mechanisms involved. The LST was applied to ‘three point bend’ specimens loaded cyclically ( R =0.1, 0.7 σ y near surface stresses), at different stages of fatigue life. Temperature surface fields were found by infrared camera. Two basic mechanisms were identified, one is related to healing mechanism (HM), which ‘erases’ prior fatigue damage up to a certain level, and the other is connected to microstructure mechanism (MM). Healing was found to be effective for surface temperatures above 400°C. In most cases, microstructure changes had a negative effect on fatigue resistance except for temperatures lower than 600°C and specific laser conditions. The combination of both mechanisms lead to optimal LST of 2 s and 0.85 kW cm −2 , for which a 50% increase in fatigue life was found to be due to MM, in addition to a full healing. A positive correlation between hardness and fatigue life was also found.

Optimum laser surface treatment of fatigue damaged Ti–6Al–4V alloy

Auxetics at the Molecular Level: A Negative Poisson's Ratio in Molecular Rods

An analytical model of the post-buckling behavior of a beam under contact constraints was derived. Experiments were carried out in order to characterize the various phenomenon involved in the problem. Two experiments with symmetric response with various contact surface and initial imperfection, and one experiment of asymmetric behavior were chosen for validation of the analytical results. The theory is based on a nonlinear kinematic approach and on the moving boundary procedure. The nonlinear equations are derived by the variational principle and solved through truncated approximating functions. A modification of an “arc-length” procedure was developed for solving the equation which incorporates the snapping effect. A comprehensive parametric study of the dominant parameters (distance between the beam and the contact surface, initial imperfections, contact location, magnitude of the contact forces, etc.) is carried out through numerical examples. Very good agreement with experimental results for the various phenomena involved in the problem was obtained for a clamped beam.

Post-buckling Behavior of Beams Under Contact Constraints

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