Single Crystal Modeling for Structural Calculations: Part 1—Model Presentation

1991 ◽  
Vol 113 (1) ◽  
pp. 162-170 ◽  
Author(s):  
L. Me´ric ◽  
P. Poubanne ◽  
G. Cailletaud
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Single Crystal ◽  
Numerical Simulations ◽  
Finite Element Code ◽  
Macro Model ◽  
Good For ◽  
Nickel Base

A micro-macro model derived from slip theory is shown. It is applied to the modeling of nickel base single crystal superalloys. The experimental data include monotonic and cyclic solicitations at 950°C. The general agreement between tests and numerical simulations is good for all the studied orientations: 〈001〉, 〈011〉, 〈111〉, and 〈123〉. The model is simple enough to be implemented in a finite element code as shown in a future part of the paper.

Numerical Investigation on the Crack Propagation in a Flat Stiffened Panel

2006 ◽  
Vol 324-325 ◽  
pp. 1039-1042 ◽  
Author(s):  
Lucio Nobile ◽  
Giuseppe Lamanna ◽  
Alessandro Soprano
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Numerical Simulations ◽  
Aluminium Alloy ◽  
Fracture Resistance ◽  
Loading Condition ◽  
Stiffened Panel ◽  
Finite Element Code ◽  
3D Finite Element ◽  
Structural Problem

This work is focussed on the numerical prediction of the fracture resistance of a flat fullscale aluminium alloy 2024 T3 stiffened panel under monotonic traction loading condition. The numerical simulations are based on the micromechanical Gurson-Tvergaard (GT) model for ductile damage. The applicability of the GT model to this kind of structural problem has been studied and assessed by comparing numerical results, obtained by using the WARP 3D finite element code, with experimental data provided from literature.

A Crystallographic Model for Nickel Base Single Crystal Alloys

1988 ◽  
Vol 55 (2) ◽  
pp. 325-331 ◽  
Author(s):  
L. T. Dame ◽  
D. C. Stouffer
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Single Crystal ◽  
Three Dimensional ◽  
Rate Sensitivity ◽  
Mechanical Analysis ◽  
Orientation Dependence ◽  
Finite Element Code ◽  
Nickel Base ◽  
Octahedral Slip

The purpose of this research is to develop a tool for the mechanical analysis of nickel-base single-crystal superalloys, specifically Rene N4, used in gas turbine engine components. This objective is achieved by developing a rate-dependent anisotropic constitutive model and implementing it in a nonlinear three-dimensional finite-element code. The constitutive model is developed from metallurgical concepts utilizing a crystallographic approach. An extension of Schmid’s law is combined with the Bodner-Partom equations to model the inelastic tension/compression asymmetry and orientation-dependence in octahedral slip. Schmid’s law is used to approximate the inelastic response of the material in cube slip. The constitutive equations model the tensile behavior, creep response and strain-rate sensitivity of the single-crystal superalloys. Methods for deriving the material constants from standard tests are also discussed. The model is implemented in a finite-element code, and the computed and experimental results are compared for several orientations and loading conditions.

scholarly journals Reverse Analysis for Determining the Mechanical Properties of Zeolite Ferrierite Crystal

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
J. Lin ◽  
X. Y. Niu ◽  
X. F. Shu
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Single Crystal ◽  
Numerical Simulations ◽  
Work Hardening ◽  
Mechanical Parameters ◽  
Stress Strain Relation ◽  
Work Hardening Rate ◽  
Nanoindentation Experiment ◽  
Reverse Analysis

In order to explore more mechanical properties of zeolite Ferrierite (FER) single crystal, a method of determining its mechanical properties—nanoindentation reverse analysis—was obtained based on the nanoindentation experiment and numerical simulations, and this will be presented in this paper. The yield stress and the characteristic work-hardening rate were gained if its stress-strain relation was a bilinear constitutive relation. The mechanical parameters obtained by reverse analysis have been compared with ones gained by nanoindentation finite-element numerical simulations.

Damage Evaluation in Cracked Vibrating Beams Using Experimental Frequencies and Finite Element Models

1996 ◽  
Vol 2 (1) ◽  
pp. 69-86 ◽  
Author(s):  
Fabrizio Vestroni ◽  
Danilo Capecchi
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Objective Function ◽  
Unique Solution ◽  
Structural Identification ◽  
Finite Element Models ◽  
Damage Evaluation ◽  
Finite Element Code ◽  
Expected Number ◽  
Vibrating Beams

The paper focuses on the problem of locating and quantifying damage in vibrating beams due to cracks. The problem is shown to have certain peculiarities that, to some extent, make it easier to solve than classical situations of structural identification. The solution of the problem is based on the minimization of the objective function that compares analytical and experimental data. A fairly general automated procedure is developed using a finite element code as a routine to evaluate modal quantities. The data necessary to locate and quantify damage correctly are discussed. General considerations lead to the conclusion that at least one measurement more than the expected number of cracked sections is necessary to obtain a unique solution. The procedures developed are applied to the study cases: a supported beam and a clamped beam with one or two cracks, using both simulated and experimental data. Satisfactory results are obtained. Although only beams were considered, the methodology developed can be extended to any kind of framed structure.

scholarly journals A Comparison of Simulation’s Results with Experiment on Water Mitigation of an Explosion

1999 ◽  
Vol 6 (2) ◽  
pp. 73-80 ◽  
Author(s):  
W.K Chong ◽  
K.Y. Lam ◽  
K.S. Yeo ◽  
G.R. Liu ◽  
O.Y. Chong
Keyword(s):  
United States ◽  
Experimental Data ◽  
Finite Element ◽  
United States Army ◽  
Peak Pressure ◽  
Three Dimensional ◽  
The United States ◽  
Small Scale ◽  
Finite Element Code ◽  
Good Comparison

This paper presents a comparison of simulation’s results with the experimental data from a series of small-scale tests conducted by Joachim and Lunderman of the United States Army Engineer Waterways Experiment Station. The purpose of the experiments was to evaluate the effect of water as a mean of reducing airblast pressure from accidental explosions in underground magazines. In the present study, a series of three-dimensional numerical calculations were conducted using a Multimaterial Eulerian Finite Element Code. Results from the numerical simulations show good comparison with the experimental data for the case with and without water. Our simulation ascertains the mitigation effects of water in reducing the maximum peak pressure and impulse density due to an explosion.

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