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Items from 1 to 13 out of 13 results

article

The application of J integral to measure cohesive laws under large-scale yielding

Stergios Goutianos, Bent F. Sørensen

Engineering Fracture Mechanics > 2016 > 155 > C > 145-165

A method is developed to obtain the mode I cohesive law of elastic–plastic materials using a Double Cantilever Beam sandwich specimen loaded with pure bending moments. The approach is based on the validity of the J integral for materials having a non-linear stress–strain relationship without unloading of any material point. This assumption is not met exactly as there is a small where the material...

article

Method of implementation of all optical tri-state logic in frequency encoded format using non-linear material

Kousik Mukherjee

Optik - International Journal for Light and Electron Optics > 2013 > 124 > 17 > 2807-2810

All optical signal processing has capability of handling huge amount of data. This has become possible by the use of multi-valued logic in place of binary logic. In this communication a frequency encoded tri-state logic gates NOT, AND and NAND are proposed for the first time using difference frequency generation in non-linear materials. The operating principle of the logic gate is the difference frequency...

article

Numerical simulation of pounding damage to bridge structures under spatially varying ground motions

Kaiming Bi, Hong Hao

Engineering Structures > 2013 > 46 > Complete > 62-76

Previous studies of pounding responses of bridge structures to seismic loadings are usually based on the point to point pounding assumption by using the simplified lumped mass model or beam–column element model. It has been found these simplified models can be used to calculate bridge pounding response with consideration of only the longitudinal excitation. In a real bridge structure under seismic...

chapter

Research in the development of computational FE software for creep damage mechanics

Dezheng Liu, Qiang Xu, Zhongyu Lu, Donglai Xu

18th International Conference on Automation and Computing (ICAC) > 1 - 6

2012 18th International Conference on Automation and Computing (ICAC)

This paper reports the preliminary development of the computational (finite element) software for creep damage analysis. Firstly, it reviews the current state of how to obtain such computational capability. Secondly, it completes with a flow diagram of the structure of new finite element software to be guided in developing in-house FE software. It further reports the strategy of how to obtain such...

article

An alternative optical method of determining the unknown microwave frequency by the use of electro-optic materials and semiconductor optical amplifier

Rupali Maji, Sourangshu Mukhopadhyay

Optik - International Journal for Light and Electron Optics > 2011 > 122 > 18 > 1622-1624

There are found different established methods for measuring the frequency of an unknown microwave signal. Several resonating and electronic methods are found where the frequency of a microwave is measured with good performances, where each method has its own advantage. Here in this communication the authors propose a new concept of measuring the frequency of unknown microwave with the joint uses of...

article

Non-linear inelastic analysis of steel arches at elevated temperatures

Amin Heidarpour, Abdul Azim Abdullah, Mark A. Bradford

Journal of Constructional Steel Research > 2010 > 66 > 4 > 512-519

An innovative non-discretisation mechanical-based method is developed in this paper to analyse a steel arch at elevated temperatures so that its behaviour can be quantified. The steel arch has a generic but singly-symmetric cross-section with elastic and plastic parts, and it is subjected to an arbitrary thermal profile which varies along the length of the arch as well as through the depth of the...

article

An all-optical integrated system for implementing arithmetic operation in 2’s complement method with the active participation of non-linear material based switches

Bijan Ghosh, Radha Raman Pal, Sourangshu Mukhopadhyay

Indian Journal of Physics > 2010 > 84 > 8 > 1101-1109

Optics is regarded undoubtedly a potential and successful candidate in information and data processing because of its inherent parallelism. In last few decades several all-optical data processors, algebraic processors, arithmetic processors are proposed. Here in this communication the authors propose a completely new scheme for implementing binary data arithmetic in 2’s Complement method which is...

article

Convergence properties of materially and geometrically non-linear finite-element spatial beam analysis

D. Zupan, M. Saje

Finite Elements in Analysis & Design > 2008 > 45 > 1 > 60-69

The way the non-linear constitutive equations in the spatial beam formulations are solved, influences the rate of convergence and the computational cost. Three different approaches are studied: (i) the direct global approach, where the constitutive equations are taken to be the iterative part of the global governing equations, (ii) the local (or indirect global) approach, where the constitutive equations...

article

Discrete and continuous treatment of local buckling in stainless steel elements

L. Gardner, M. Theofanous

Journal of Constructional Steel Research > 2008 > 64 > 11 > 1207-1216

Cross-section classification is an important concept in the design of metallic structures, as it addresses the susceptibility of a cross-section to local buckling and defines its appropriate design resistance. For structural stainless steel, test data on cross-section capacity have previously been relatively scarce. Existing design guidance has been developed based on the limited experimental results...

article

Numerical characterization of the structural behaviour of the Basilica of Pilar in Zaragoza (Spain). Part 1: Global and local models

L.E. Romera, S. Hernández, J.M. Reinosa

Advances in Engineering Software > 2008 > 39 > 4 > 301-314

The Basilica of Pilar, located in the city of Zaragoza, is one of the most famous Spanish temples. Several domes of this church contain frescoes painted by Francisco de Goya, which have suffered damages in the past decades due to various pathologies. The frescoes of the Regina Martirum dome are being restored at the present time. In this paper, we present a set of structural models of the entire temple...

article

Structural design for non-linear metallic materials

Leroy Gardner, Mahmud Ashraf

Engineering Structures > 2006 > 28 > 6 > 926-934

The material stress–strain behaviour of structural carbon steel may be suitably accurately reflected for design purposes by an idealised elastic, perfectly-plastic material model; such material behaviour lends itself to the concept of section classification. There are, however, a number of structural materials, such as aluminium, stainless steel and some high strength, cold-worked steels, where this...

article

Ultraviolet irradiation effect of Ce3+-doped BaMgF4 crystals

Eiji Hayashi, Kiyotaka Ito, Satoshi Yabashi, Mitsuo Yamaga, more

Journal of Alloys and Compounds > 2006 > 408-412 > Complete > 883-885

Ce ³⁺ -doped BaMgF ₄ (BMF) crystals have the absorption and luminescence spectra in the vacuum ultraviolet (VUV) and ultraviolet (UV) ranges. Strong excitation of the fourth harmonic (266nm) of a pulsed Nd:YAG laser colours the BMF crystal brown and produces a new luminescence spectrum with double peaks at 445 and 500nm and a lifetime of less than 10ns. When the sample temperature...

article

Undoped and Yb3+-doped Al2(WO4)3: crystal growth and spectroscopy of new optical materials

E. Gallucci, S. Ermeneux, C. Goutaudier, M.Th. Cohen-Adad, more

Optical Materials > 2001 > 16 > 1-2 > 193-197

Pure and Yb ³⁺ -doped Al ₂ (WO ₄ ) ₃ single crystals of good quality and purity were grown using the Bridgman–Stockbarger method. This is the first time that Al ³⁺ is substituted with big cations such as lanthanide ones. Undoped, this compound has attractive properties as a non-linear χ ⁽³⁾ material (ν ₁ =1049 cm ⁻¹ ). When doped with...

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