scholarly journals Best practices for modeling structural boundary conditions due to a localized fire

2019 ◽  
Vol 44 (3) ◽  
pp. 409-422
Author(s):  
Alyssa DeSimone ◽  
Ann E. Jeffers
Keyword(s):  
Best Practices ◽  
Boundary Conditions ◽  
Structural Boundary

Principles and Practice of Modeling in CAD

2013 ◽  
Vol 753-755 ◽  
pp. 1299-1302 ◽  
Author(s):  
Josef Šedivý ◽  
Stepan Hubalovsky
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Conditions ◽  
Structural Design ◽  
Computational Algorithm ◽  
Stress And Strain ◽  
Computer Aided ◽  
Loaded Part ◽  
Structural Boundary ◽  
3D Digital Models

Computer Aided Engineering are all tools for implementing of simulations and engineering calculations on 3D digital models and assemblies created in the CAD module. Computational algorithm works based on Finite Element Method - FEM. In connection with the design of structural design out strength calculations to determine the stress and strain in the loaded part of the structure is usually carried out. A network of elements is defined on a 3D digital model or assembly. Geometric and structural boundary conditions are specified according to functionality of construction.

scholarly journals Rethinking performativity

2019 ◽  
Vol 32 (4) ◽  
pp. 930-956 ◽  
Author(s):  
Max Baker ◽  
Sven Modell
Keyword(s):  
Boundary Conditions ◽  
Theory Development ◽  
Alternative Conceptions ◽  
Social Structures ◽  
Content Type ◽  
Accounting Research ◽  
Context Sensitive ◽  
Critical Realist ◽  
Structural Boundary ◽  
Realist Perspective

PurposeThe purpose of this paper is to advance a critical realist perspective on performativity and use it to examine how novel conceptions of corporate social responsibility (CSR) have performative effects.Design/methodology/approachTo illustrate how the authors’ critical realist understanding of performativity can play out, the authors offer a field study of an Australian packaging company and engage in retroductive and retrodictive theorising.FindingsIn contrast to most prior accounting research, the authors advance a structuralist understanding of performativity that pays more systematic attention to the causal relationships that underpin performative tendencies. The authors explain how such tendencies are conditioned by pre-existing, social structures, conceptualised in terms of multiple, intersecting norm circles. The authors illustrate their argument empirically by showing how specific conceptions of CSR, centred on the notion of “shared value”, were cemented by the interplay between the causal powers embedded in such norm circles and how this suppressed alternative conceptions of this phenomenon.Research limitations/implicationsThe findings draw attention to the structural boundary conditions under which particular conceptions of CSR can be expected to become performative. Greater attention to such boundary conditions, denoting the social structures that reinforce and counteract performative tendencies, is required to further cumulative, yet context-sensitive, theory development on this topic.Originality/valueThe paper is the first to adopt a critical realist perspective on performativity in the accounting literature. This perspective strikes a middle path between the highly constructivist ontology, adopted in most accounting research concerned with performativity and realist criticisms of this ontological position for de-emphasising the influence of pre-existing, objective realities on performativity.

Experimental Determination of Non-Ideal Structural Boundary Conditions Based on Spectral Element Model

2006 ◽  
Vol 326-328 ◽  
pp. 1625-1628
Author(s):  
Joo Yong Cho ◽  
Usik Lee
Keyword(s):  
Boundary Conditions ◽  
Element Model ◽  
Spectral Element ◽  
Ideal Boundary ◽  
Beam Structures ◽  
Effective Boundary ◽  
Vibration Responses ◽  
Structural Boundary ◽  
Spring Constants

In this paper, experiments are conducted to determine the non-ideal boundary conditions (BCs) of example beam structures. The spectral element (SE)-model is used for the beam structures, and the non-ideal BCs are represented by the frequency-dependent effective boundary springs. The boundary spring constants are then determined from the measured FRF-data. It is shown that the vibration responses analytically predicted by using experimentally identified BCs are very close to the measurements.

Comparison of 1D and 2D Theories of Thermoelastic Damping in Flexural Microresonators

2007 ◽  
Vol 1052 ◽  
Author(s):  
Sairam Prabhakar ◽  
Srikar Vengallatore
Keyword(s):  
Boundary Conditions ◽  
Two Dimensions ◽  
Temperature Gradients ◽  
Mode Shapes ◽  
Thermoelastic Damping ◽  
Flexural Mode ◽  
Aspect Ratios ◽  
Curvature Information ◽  
Structural Boundary ◽  
2D Model

AbstractThermoelastic damping (TED) represents the lower limit of material damping in flexural mode micro- and nanoresonators. Current predictive models of TED calculate damping due to thermoelastic temperature gradients along the beam thickness only. In this work, we develop a two dimensional (2D) model by considering temperature gradients along the thickness and the length of the beam. The Green's function approach is shown to be a robust means of solving the coupled heat conduction equation in one and two dimensions. In the 1D model, curvature information is lost and, hence, the effects of structural boundary conditions and mode shapes on TED are not captured. In contrast, the 2D model retains curvature information in the expression for TED and can account for beam end conditions and higher order modes. The differences between the 1D and 2D models are systematically explored over a range of beam aspect ratios, frequencies, boundary conditions, and flexural mode shapes.

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