Modelling glacial till under triaxial conditions using a BRICK soil model

2000 ◽  
Vol 37 (5) ◽  
pp. 1078-1088 ◽  
Author(s):  
Barry M Lehane ◽  
Brian Simpson
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Glacial Till ◽  
Ground Movement ◽  
Laboratory Research ◽  
Finite Element Code ◽  
Soil Model ◽  
Dimensional Version ◽  
Recent Laboratory

The paper presents some findings from recent laboratory research aimed at improving ground-movement predictions in a hard, heavily overconsolidated lodgement till. These findings are subsequently applied to a new three-dimensional version of the BRICK soil model to investigate the suitability of this model for the till. It is shown that BRICK captures the essential features of the material's behaviour under triaxial conditions and is capable, when incorporated in a finite element code, of providing realistic predictions for the settlement of shallow foundations.Key words: glacial till, stiffness, strength, BRICK model, footing settlement.

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.

Finite-Element Analysis of Fatigue Lifetime in Pavements

2000 ◽  
Vol 1709 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Jeffrey W. Simons ◽  
Lynn Seaman
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Asphalt Pavement ◽  
Three Dimensional ◽  
Load Cycle ◽  
Repeated Loading ◽  
Finite Element Code ◽  
Element Analysis ◽  
Bending Fatigue ◽  
Dimensional Finite Element

A computational model was developed to predict fatigue life of pavements under repeated loading and implemented into the three-dimensional finite-element code DYNA3D and the two-dimensional finite-element code NIKE2D. The model simulates the cracking response of flexible or rigid pavements under fatigue. An equation for fatigue crack growth was developed, which grows cracks under single cycles of loading at stresses well below yield. The cracks are incorporated into the material response and result in anisotropic behavior and decreased stiffness for cracked pavements. A procedure for estimating fatigue lifetimes by performing a limited series of calculations was developed. For each calculation, crack growth rate for a single loading cycle is calculated, crack extension is extrapolated to many cycles, and the cracking in the pavement is updated. The next cycle is calculated for the damaged pavement. The procedure is repeated until full damage is reached. Well-controlled laboratory bending fatigue test results generated at the University of California at Berkeley (UCB) for asphalt pavement were used to verify that the model assumptions are appropriate for modeling fatigue damage growth in asphalt pavement. The UCB bending fatigue tests were simulated using the repeat loading algorithm in DYNA3D. Calculations of crack growth for a given load cycle were compared in the NIKE2D and DYNA3D implementations.

scholarly journals Design and Analysis of a Ceramic Stator Vane

1975 ◽  
Author(s):  
S. C. Sanday ◽  
T. L. Lam ◽  
T. J. Rahaim
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
High Temperature ◽  
Three Dimensional ◽  
Finite Element Code ◽  
Isoparametric Finite Element ◽  
Stator Vane ◽  
Transient Thermal ◽  
Industrial Gas Turbine ◽  
Temperature Time

The development of a ceramic stator vane for the first stage of a high temperature industrial gas turbine is presented. The elastic transient thermal stress analysis of the latest design, using a three-dimensional isoparametric finite element code is outlined. Results for a vane assembly made of silicon nitride and exposed to several temperature-time conditions are discussed.

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.

Analysis of a PHWR Outlet Feeder Vibration Due to Random Turbulence-Induced Excitation

2007 ◽  
Author(s):  
Y. Han ◽  
V. P. Janzen ◽  
B. A. W. Smith ◽  
T. Godet
Keyword(s):  
Finite Element ◽  
Nuclear Reactor ◽  
Three Dimensional ◽  
Nuclear Industry ◽  
Finite Element Code ◽  
Two Phase ◽  
Accelerated Corrosion ◽  
Beam Elements ◽  
Vibration Tests ◽  
Flow Accelerated Corrosion

A nuclear-reactor feeder pipe has been analyzed to assess its vibration and stresses due to internal coolant random turbulence-induced excitation. The structural models were created from both isoparametric beam elements and continuum elements in the finite-element code H3DMAP, a general three-dimensional mechanics analysis package developed to solve a wide variety of problems encountered in the nuclear industry. The feeder was also modelled with beam elements in VIBIC, a finite-element code designed for the vibration assessment of beam-like structures. The excitation forces were based on recent experimental results obtained from piping-vibration tests that used two-phase air/water flow, performed at E´cole Polytechnique at Montreal. Feeder vibration levels, in terms of normalized response amplitude and velocity, and normalized vibratory stresses along the feeder are predicted for the as-designed feeder and for feeders thinned by flow-accelerated corrosion.

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