scholarly journals Dynamic Response of Soft Core Sandwich Beams with Metal-Graphene Nanocomposite Skins

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
M. A. R. Loja
Keyword(s):  
Material Properties ◽  
Specific Problem ◽  
Structural Response ◽  
Core Material ◽  
Complex Method ◽  
Graphene Nanocomposite ◽  
Shear Deformation Theories ◽  
Sandwich Configuration ◽  
Graded Properties ◽  
Sandwich Core

Sandwich structures are able to provide enhanced strength, stiffness, and lightweight characteristics, thus contributing to an improved overall structural response. To this sandwich configuration one may associate through-thickness graded core material properties and homogeneous or graded properties nanocomposite skins. These tailor-made possibilities may provide alternative design solutions to specific problem requisites. This work aims to address these possibilities, considering to this purpose a package of three beam layerwise models based on different shear deformation theories, implemented through Kriging-based finite elements. The viscoelastic behaviour of the sandwich core is modelled using the complex method and the dynamic problem is solved in the frequency domain. A set of case studies illustrates the performance of the models.

Analysis and design of thermo-mechanical interfaces

2012 ◽  
Vol 60 (2) ◽  
pp. 205-213
Author(s):  
K. Dems ◽  
Z. Mróz
Keyword(s):  
Optimality Conditions ◽  
Mechanical Loading ◽  
Material Properties ◽  
Structural Response ◽  
External Boundary ◽  
Mechanical Loads ◽  
Internal Interface ◽  
Analysis And Design ◽  
First Order ◽  
Mechanical Nature

Abstract. An elastic structure subjected to thermal and mechanical loading with prescribed external boundary and varying internal interface is considered. The different thermal and mechanical nature of this interface is discussed, since the interface form and its properties affect strongly the structural response. The first-order sensitivities of an arbitrary thermal and mechanical behavioral functional with respect to shape and material properties of the interface are derived using the direct or adjoint approaches. Next the relevant optimality conditions are formulated. Some examples illustrate the applicability of proposed approach to control the structural response due to applied thermal and mechanical loads.

scholarly journals Mechanical properties of a balsa wood veneer structural sandwich core material

2020 ◽  
Vol 265 ◽  
pp. 120193
Author(s):  
Chao Wu ◽  
Niloufar Vahedi ◽  
Anastasios P. Vassilopoulos ◽  
Thomas Keller
Keyword(s):  
Mechanical Properties ◽  
Core Material ◽  
Wood Veneer ◽  
Balsa Wood ◽  
Sandwich Core

Managing work-life boundaries with mobile technologies

2015 ◽  
Vol 28 (1) ◽  
pp. 34-71 ◽  
Author(s):  
Karlene Cousins ◽  
Daniel Robey
Keyword(s):  
Mobile Devices ◽  
Mobile Technology ◽  
Material Properties ◽  
Management Practices ◽  
Management Strategies ◽  
Work Life ◽  
Mobile Technologies ◽  
Core Material ◽  
Boundary Management ◽  
Content Type

Purpose – The purpose of this paper is to explore the role that mobile technologies play in mobile workers’ efforts to manage the boundaries between work and non-work domains. Previous theories of work-life boundary management frame boundary management strategies as a range between the segmentation and integration of work-life domains, but fail to provide a satisfactory account of technology’s role. Design/methodology/approach – The authors apply the concept of affordances, defined as the relationship between users’ abilities and features of mobile technology, in two field studies of a total of 25 mobile workers who used a variety of mobile devices and services. Findings – The results demonstrate that the material features of mobile technologies offer five specific affordances that mobile workers use in managing work-life boundaries: mobility, connectedness, interoperability, identifiability and personalization. These affordances persist in their influence across time, despite their connection to different technology features. Originality/value – The author found that mobile workers’ boundary management strategies do not fit comfortably along a linear segmentation-integration continuum. Rather, mobile workers establish a variety of personalized boundary management practices to match their particular situations. The authors speculate that mobile technology has core material properties that endure over time. The authors surmise that these material properties provide opportunities for users to interact with them in a manner to make the five affordances possible. Therefore, in the future, actors interacting with mobile devices to manage their work-life boundaries may experience affordances similar to those the authors observed because of the presence of the core material properties.

Twice-Yield Method Abaqus Implementation With Application to a Thermally Shocked Stepped Pipe

2021 ◽  
Author(s):  
Steven M. Smith ◽  
David N. Hutula
Keyword(s):  
Finite Element Analysis ◽  
Material Properties ◽  
Structural Response ◽  
Analysis Method ◽  
Load Range ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Lehigh University ◽  
Plastic Analysis ◽  
Technical Basis

Abstract The Twice-Yield method is an elastic-plastic finite element analysis (FEA) pioneered by Professor Arturs Kalnins at Lehigh University which approximates the stabilized cyclic response that would otherwise be obtained from a cycle-by-cycle elastic-plastic FEA. The Twice-Yield method is used to evaluate the load range conditions which occur between any two load states from the stabilized cyclic structural response. The rigorous implementation of the Twice-Yield method requires special handling of material properties. In particular, the method requires the average of the properties corresponding to the two load states. This paper documents a detailed technical basis of the Twice-Yield method’s implementation in Abaqus including the special handling of material properties. An assessment of the Twice-Yield method is performed based on analyzing a thermally shocked stepped pipe. Included in the assessment are comparisons of the cycle-by-cycle elastic-plastic FEA results and the Twice-Yield method elastic-plastic FEA results. The comparisons show the efficacy of the Twice-Yield method as a viable cyclic elastic-plastic analysis method.

Design Study of Composite Sandwich Truck Tank Using a High-Order Sandwich Theory Approach

2001 ◽  
Author(s):  
Ole T. Thomsen ◽  
Jack R. Vinson
Keyword(s):  
Sandwich Panel ◽  
Numerical Study ◽  
Structural Response ◽  
Hydraulic Head ◽  
High Order ◽  
Elastic Response ◽  
Core Material ◽  
Theory Approach ◽  
Design Study ◽  
Composite Sandwich

Abstract The paper presents a preliminary design study on the structural response of a boxy composite sandwich truck tank subjected to hydraulic head loading. The design study is approximate in that it considers a 2-D cross section of the composite sandwich truck tank. The design study is performed using a high-order sandwich theory formulation in which the elastic responses of the face laminates are accounted for individually, and in which the transverse flexibility of the sandwich core is included. Thus the model allows the sandwich panel thickness of the truck tank to change during deformation, and the model accounts for the existence of transverse normal stresses in the core material in the sandwich panel sections. The paper includes a presentation of the high-order formulation for the curved sandwich panel parts of the composite sandwich truck tank sections, as well as a brief description of the numerical solution of the complete set of system equations with corresponding boundary conditions. The paper is concluded with a numerical study, showing the characteristic features of the elastic response of a composite sandwich truck tank section subjected to hydraulic head loading.

Numerical Analysis of a Novel Thermoplastic Sandwich Core Material

2000 ◽  
Vol 2 (3) ◽  
pp. 215-224 ◽  
Author(s):  
Christopher Y. Tuan ◽  
Robert L. Sierakowski
Keyword(s):  
Numerical Analysis ◽  
Core Material ◽  
Sandwich Core

scholarly journals Simplified analysis of large deflections for metal sandwich plates with various lattice cores subjected to impulsive loading

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878740
Author(s):  
Wei Zhang ◽  
Qinghua Qin ◽  
Jianxun Zhang ◽  
Shangjun Chen ◽  
Zili Xu
Keyword(s):  
Structural Response ◽  
Yield Condition ◽  
Bending Moment ◽  
String Model ◽  
Impulsive Loading ◽  
Sandwich Plates ◽  
Wide Range ◽  
Theoretical Predictions ◽  
Simplified Analysis ◽  
Sandwich Core

A new simplified analysis is carried out to predict the dynamic response of clamped metal sandwich plates with various lattice cores subjected to impulsive loading. Based on the yield condition for sandwich plate cross-section, the interaction of bending moment and axial force for the section is decoupled. The simplified analytical solutions of the maximum midspan deflection and structural response time are obtained. Moreover, neglecting the effect of bending moment, a simplified plastic-string model is developed. Comparisons of the present theoretical predictions with previous analytical and numerical results are conducted and good agreement is achieved for a wide range of sandwich core topologies.

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