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.

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.

Progressive failure analysis of scarf-repaired composite laminate based on damage constitutive model

2016 ◽  
Vol 233 (2) ◽  
pp. 180-188 ◽  
Author(s):  
Qiuyi Shen ◽  
Zhenghao Zhu ◽  
Yi Liu
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Composite Laminate ◽  
Damage Mechanics ◽  
Cohesive Zone Model ◽  
Load Capacity ◽  
Three Dimensional ◽  
Zone Model ◽  
State Variables ◽  
Element Analysis

A three-dimensional finite element model for scarf-repaired composite laminate was established on continuum damage model to predict the load capacity under tensile loading. The mixed-mode cohesive zone model was adopted to the debonding behavior analysis of adhesive. Damage condition and failure of laminates and adhesive were subsequently addressed. A three-dimensional bilinear constitutive model was developed for composite materials based on damage mechanics and applied to damage evolution and loading capacity analyses by quantifying damage level through damage state variables. The numerical analyses were implemented with ABAQUS finite element analysis by coding the constitutive model into material subroutine VUMAT. Good agreement between the numerical and experimental results shows the accuracy and adaptability of the model.

Nonlinear Finite Element Analysis of Super-Long Pile and Soil Interaction in Soft Soil

2011 ◽  
Vol 201-203 ◽  
pp. 1601-1605 ◽  
Author(s):  
Shang Ping Chen ◽  
Wen Juan Yao ◽  
Sheng Qing Zhu
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Soft Soil ◽  
Three Dimensional ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Element Analysis ◽  
Friction Resistance ◽  
Tip Resistance ◽  
Side Friction

In this paper, a nonlinear three-dimensional finite element model for super-long pile and soil interaction is established. In this model, contact elements are applied to simulate the nonlinear behavior of interaction of super-long pile and soil. A nonlinear elastic constitutive model for concrete is employed to analyze stress-strain relation of pile shaft under the axial load and the Duncan-Chang’s nonlinear constitutive model is used to reflect nonlinear and inelastic properties of soil. The side friction resistance, axial force, pile-tip resistance, and developing trend of soil plastic deformation are obtained and compared with measured results from static load tests. It is demonstrated that a super-long pile has the properties of degradation of side friction resistance and asynchronous action between side and pile-tip resistance, which is different from piles with a short to medium length.

Orientation-dependent Constitutive Model with Nonlinear Elasticity for Shocked β-HMX Single Crystal

2012 ◽  
Vol 13 (1) ◽  
Author(s):  
Yan-Qing Wu ◽  
Feng-Lei Huang
Keyword(s):  
Constitutive Model ◽  
Single Crystal ◽  
Mechanical Behavior ◽  
Single Crystals ◽  
Nonlinear Elasticity ◽  
Chemical Reactions ◽  
Crystal Plasticity ◽  
Orientation Dependence ◽  
Plasticity Model ◽  
Crystal Plasticity Model

AbstractAs orientation-dependence of shock-induced thermal responses and chemical reactions in energetic single crystals are related to anisotropic mechanical behavior, a crystal plasticity model for low-symmetric

Three-Dimensional Finite Element Simulation of Electro and Stress Migration Effects in Interconnect Lines

1997 ◽  
Vol 473 ◽  
Author(s):  
Sven Rzepka ◽  
Matt A. Korhonen ◽  
Eicke R. Weber ◽  
Che-Yu Li
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Grain Structure ◽  
Finite Element Code ◽  
Fem Simulations ◽  
Line Segments ◽  
Element Simulation ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Interconnect Lines

ABSTRACTA tool for 3-D modeling of EM and SM in interconnect lines has been developed based on a commercial finite element code. After detailing the approach, we focus on the verification of the simulator by comparing the results of 1-D analytic and FEM simulations, and then we apply the simulator to interconnect line segments with a specified grain structure.

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