Finite Element Simulation and Assessment of Single-Degree-of-Freedom Prediction Methodology for Insulated Concrete Sandwich Panels Subjected to Blast Loads

2011 ◽  
Author(s):  
Charles Michael Newberry
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Sandwich Panels ◽  
Degree Of Freedom ◽  
Blast Loads ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Element Simulation

A Finite-Element-Based Method to Determine the Spatial Stiffness Properties of a Notch Hinge

1998 ◽  
Vol 123 (1) ◽  
pp. 141-147 ◽  
Author(s):  
Shilong Zhang ◽  
Ernest D. Fasse
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Joint Stiffness ◽  
Degree Of Freedom ◽  
Design Parameters ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Stiffness Properties ◽  
Six Degree Of Freedom ◽  
Flexural Hinges

Notch hinges are flexural hinges used to make complex, precise mechanisms. They are typically modeled as single degree-of-freedom hinges with an associated joint stiffness. This is not adequate for all purposes. This paper computes the six degree-of-freedom stiffness properties of notch hinges using finite element methods. The results are parameterized in terms of meaningful design parameters.

FOLDING OF A TYPE OF DEPLOYABLE ORIGAMI STRUCTURES

2012 ◽  
Vol 12 (06) ◽  
pp. 1250054 ◽  
Author(s):  
YAO CHEN ◽  
JIAN FENG
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Jacobian Matrix ◽  
Element Analysis ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Element Simulation ◽  
Rigid Plane ◽  
Configuration Changes ◽  
Good Agreement

Some types of rigid origami possess specific geometric properties. They have a single degree of freedom, and can experience large configuration changes without cut or being stretched. This study presents a numerical analysis and finite element simulation on the folding behavior of deployable origami structures. Equivalent pin-jointed structures were established, and a Jacobian matrix was formed to constrain the internal mechanisms in each rigid plane. A nonlinear iterative algorithm was formulated for predicting the folding behavior. The augmented compatibility matrix was updated at each step for correcting the incompatible strains. Subsequently, finite element simulations on the deployable origami structures were carried out. Specifically, two types of generalized deployable origami structures combined by basic parts were studied, with some key parameters considered. It is concluded that, compared with the theoretical values, both the solutions obtained by the nonlinear algorithm and finite element analysis are in good agreement, the proposed method can well predict the folding behavior of the origami structures, and the error of the numerical results increases with the increase of the primary angle.

scholarly journals Extended framework of Hamilton’s principle for single-degree-of-freedom nonlinear damping systems

2020 ◽  
pp. 146134842096161
Author(s):  
Jinkyu Kim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Damping ◽  
Degree Of Freedom ◽  
Hamilton’S Principle ◽  
Hamilton's Principle ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Damping Systems ◽  
Element Method

The paper explores application of the variational formalism called extended framework of Hamilton’s principle to nonlinear damping systems. Single-degree-of-freedom systems with dominant source of nonlinearity from polynomial powers of the velocity are initially considered. Appropriate variational formulation is provided, and then the corresponding weak form is discretized to produce a novel computational method. The resulting low-order temporal finite element method utilizes non-iterative algorithm, and some examples are provided to verify its performance. The present temporal finite element method using small time step is equivalent to the adaptive Runge–Kutta–Fehlberg method with default error tolerances in MATLAB, and additional simulation shows its good convergence characteristics.

scholarly journals Sistem Respon Satu Derajat Kebebasan terhadap Beban Harmonik pada Struktur Portal 2D

2019 ◽  
Vol 23 (2) ◽  
pp. 136-140
Author(s):  
Muhammad Zubair Muis Alie ◽  
Indah Melati Suci ◽  
Astika Rajmi ◽  
Andi Muhammad Alfian Arafat
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Dynamics ◽  
Cyclic Load ◽  
Degree Of Freedom ◽  
Harmonic Loading ◽  
Fe Method ◽  
Mechanical Vibrations ◽  
Single Degree Of Freedom ◽  
Single Degree

Response of One Degree of Freedom System to Harmonic Loading on the structure idealized as single degree of freedom systems excited harmonically, that is structure subjected to force or displacement where the magnitude may be represented by a sine or cosine function of time. This type of excitation results one of the most important motions in the study of mechanical vibrations as well as in applications to structural dynamics. Structure is very often subjected to the dynamic action such cyclic load acting and resulting response due to the the unavoidable load eccentricity. The objective of the present study is to analyze the response of one-degree of freedom system to the portal 2D. The structure is modelled and analyzed using finite element method. The result obtained by FE method is joint displacement of the structure.

A Fast-Running Finite Element Based Method for Evaluating the Blast Performance of Laminated Insulated Glazing

2008 ◽  
Author(s):  
Chad McArthur ◽  
Darren Tennant ◽  
Jim Weeks
Keyword(s):  
Finite Element ◽  
Blast Loading ◽  
Degree Of Freedom ◽  
Calculation Methods ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Fast Running ◽  
Current State ◽  
State Of Practice ◽  
Blast Performance

The current state of practice in the design and assessment of Insulated Glazing Units to resist blast loading utilizes calculation methods to estimate the performance. The most prevalent methods used for calculating the window’s performance have been developed from a single degree of freedom (SDOF) approach. This paper presents an alternative, finite element based, approach to analyzing the blast performance of laminated insulated glazing units. The modeling approach is described for each of the primary components represented in the analysis and the results of an indicative model are compared against an equivalent analysis calculated using SDOF methods.

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