mechanics of shape memory alloy materials constitutive modeling and numerical implications

... DISCRETE MODELING OF SHAPE MEMORY ALLOYS S MOHANRAJ (M.Sc Materials Science and Engineering, NUS, 2003) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF MECHANICAL ... understanding of materials from atomic scale to macroscopic scale 1.2 Shape Memory Alloy behaviour Phase transitions occur in Shape memory alloys (SMA) through a diffusionless rearrangement of atoms ... understand, predict and control the properties of materials The scientific investigation of materials with microstructure greatly depends on the mathematical models and simulations of materials at different...

Ngày tải lên: 14/09/2015, 14:08

... research focuses on Shape Memory Alloy (SMA) materials and provides a technique to prestress a simply supported concrete beam using the shape memory effect of nitinol (NiTi, Shape Memory Alloy) to control ... Some materials also undergo a shape change upon cooling These materials are called Shape Memory Alloys having two-way shape memory* Shape Memory Alloys are novel materials that have the ability ... 1.1.4 Nitinol (NiTi Shape Memory Alloy) : The most common shape memory material is an alloy of nickel and titanium called Nitinol This particular alloy has very good electrical and mechanical properties,...

Ngày tải lên: 04/07/2016, 17:20

... mechanical and shape- memory properties of SMPs is examined The characterization of polymers structure, thermal, and mechanical properties, and the investigation of shapememory behavior of star polymers ... tensile strength (σm) of 14-20 MPa and Young’s modulus (E) of 70-91 MPa) and exhibited excellent shape- memory property at 40 oC, with Rf of over 95%, Rr of over 97%, and shape recovery within ... network.89-91 Similarly, Mn of PCL precursor and content of crosslinkes strongly influenced the thermal, mechanical and shape- memory properties of the networks Tm and mechanical properties of the network...

Ngày tải lên: 11/09/2015, 09:58

... response to NH and NO compared with pure WO The materials of WO loaded with wt.% Cr, La, Pr, Sm, Gd, Er, Tm and Yb showed good responses to NH , and hardly responded to NO, and the materials of WO loaded ... sensitivity and responding properties of WO decayed with loading of alkali metals The responding and recovery properties were obviously improved by loading with alkali earth metals The materials of WO ... wt.% Ba, Te, and Pb showed good responses to NO and hardly responded to NH These two kinds of materials can be used as NH and NO selective gas sensors, respectively The characteristics of WO 3-based...

Ngày tải lên: 20/03/2014, 13:08

... Roeser, Rafaela Hillerbrand, Per Sandin, Martin Peterson (Eds.) Handbook of Risk Theory Epistemology, Decision Theory, Ethics, and Social Implications of Risk With 85 Figures and 62 Tables Editors ... Faculty of Technology, Policy and Management Delft University of Technology Delft The Netherlands and Philosophy Department University of Twente Enschede The Netherlands Rafaela Hillerbrand Human ... Hillerbrand, Per Sandin, and Martin Peterson Acknowledgments Sabine Roeser’s work for the Handbook of Risk Theory has been conducted at the philosophy departments of TU Delft and Twente University and...

Ngày tải lên: 14/03/2014, 10:20

... a year of college This assumption implies a linear relationship between the log of earnings and the number of years of education.15 Second, we assume that the cost of an additional year of education ... a function of years of education, years of work experience, and ability Interpretation and Empirical Evidence: The slope, r, in equation (11) represents the rate of return to a year of education ... (1993), Butcher and Case (1994), Ashenfelter and Krueger (1994), and Ashenfelter and Zimmerman (1993) Variations of the IV technique are applied, the conclusions of which support Harmon and Walker’s...

Ngày tải lên: 17/03/2014, 08:20

... Indirect evidence of this is found in Figs 2a and 2b Among those 75 years and over, regardless of sex, the proportion of people who explained that their health problems were the result of aging was ... to many other sources of data, the NPHS shows that with increasing age, utilization by elderly people of hospital and home-care services and of medications (prescription and over-the-counter drugs) ... than 40% of women and 30% of men were living in institutions.22 Moore and associates23 estimated lower bounds on the proportions of the elderly population entering institutions between 1986 and 1991...

Ngày tải lên: 28/03/2014, 19:21

... glutamate and cationic zinc [4-8] The receptors are also the targets of plant toxins such as nicotine and strychnine, conotoxins of snails, lophotoxins of corals, and many of the neurotoxins of elapid ... members of the ART-LGIC superfamily and discuss the general implications of these proteins for the mechanisms and origin of the Cys-loop receptors of the animal nervous system Results and discussion ... constituents of the ligand-binding box (Figure 2) Of these, the dyad of two consecutive cysteines, which are amino-terminal to the final strand of the LBD is observed only in a subset of the animal...

Ngày tải lên: 14/08/2014, 14:21

... the field of mathematical and numerical modeling of mechanical behavior of granular materials and materials with different strengths Zones of the strains localization are defined by means of proposed ... theory of granular materials is among the most interesting and intensively developing fields of mechanics because the area of its application is very wide It involves problems of mechanics of geomaterials ... Golovanov, Y.V., Shirko, I.V.: Review of current state of the mechanics of fast motions of granular materials In: Shirko, I.V (ed.) Mechanics of Granular Media: Theory of Fast Motions, Ser New in Foreign...

Ngày tải lên: 16/03/2014, 22:20

Ngày tải lên: 23/12/2013, 00:15

Ngày tải lên: 23/12/2013, 00:15

... ADVANCED MECHANICS OF COMPOSITE MATERIALS ADVANCED MECHANICS OF COMPOSITE MATERIALS Valery V Vasiliev Distinguished Professor Department of Mechanics and Optimization of Processes and Structures ... elasticity, mechanics of composite materials, design, analysis, fabrication, and application of composite structures According to the list of books on composites presented in Mechanics of Fibrous ... published ones which usually cover not only mechanics of materials but also include analysis of composite beams, plates and shells, joints, and elements of design of composite structures that, being...

Ngày tải lên: 05/03/2014, 15:20

... ADVANCED MECHANICS OF COMPOSITE MATERIALS ADVANCED MECHANICS OF COMPOSITE MATERIALS Valery V Vasiliev Distinguished Professor Department of Mechanics and Optimization of Processes and Structures ... elasticity, mechanics of composite materials, design, analysis, fabrication, and application of composite structures According to the list of books on composites presented in Mechanics of Fibrous ... published ones which usually cover not only mechanics of materials but also include analysis of composite beams, plates and shells, joints, and elements of design of composite structures that, being...

Ngày tải lên: 22/03/2014, 12:20

Ngày tải lên: 22/03/2014, 12:20

Ngày tải lên: 22/03/2014, 12:20

... tool, its proper (and correct) usage in the context of non-linear analysis requires a solid and thorough understanding of the fundamentals of Mechanics Unfortunately, this is often forgotten as ... Mechanics of Materials II Draft CONTENTS Victor Saouma Mechanics of Materials II viii Draft List of Figures 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Direction ... the number of components of a tensor is 3n where n is the order of the tensor 42 43 A force and a stress are tensors of order and respectively 1.3.2 44 Tensor Operations Sum: The sum of two (second...

Ngày tải lên: 22/03/2014, 12:20

Ngày tải lên: 22/03/2014, 13:20

... derivations and proofs of various basic equations in the study of the mechanics of composite materials The derivations of the remaining equations are left to some of the problems Solutions to most of ... namely, homogenization of composite materials, and damage mechanics of composite materials The authors have deliberately left out the two topics of laminated plates and stability of composites as they ... a number of examples is solved demonstrating both the theory and numerical computations The examples are of two types: the first type is theoretical and involves derivations and proofs of various...

Ngày tải lên: 08/04/2014, 10:21

... subsided, and they both taught sections of these courses as they kept revising their texts and began writing together the manuscript of the first edition of Mechanics of Materials Ferd and Russ’s ... helped them in statics and dynamics GENERAL APPROACH In this text the study of the mechanics of materials is based on the understanding of a few basic concepts and on the use of simplified models ... objective of the study of the mechanics of materials is to provide the future engineer with the means of analyzing and designing various machines and load-bearing structures Both the analysis and the...

Ngày tải lên: 08/04/2014, 11:21

... Mechanics of materials - 3rd ed An introduction to the mechanics of elastic and plastic deformation of solids and structural materials Strength of materials Strains and stress Deformations (Mechanics) ... Library of Congress Cataloguing in Publication Data Heam, E J (Edwin John) Mechanics of materials 1: an introduction to the mechanics of elastic and plastic deformation of solids and structural materialsE ... second moments of area 1.4 Land’s circle of second moments of area f 1.5 Rotation of axes: determination of moments o area in terms of the principal values I The ellipse of second moments of area 1.7...

Ngày tải lên: 04/06/2014, 13:26