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 Probabilistic fatigue damage prognosis using surrogate models trained via three-dimensional finite element analysis

2016 ◽  
Vol 16 (3) ◽  
pp. 291-308 ◽  
Author(s):  
Patrick E Leser ◽  
Jacob D Hochhalter ◽  
James E Warner ◽  
John A Newman ◽  
William P Leser ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Crack ◽  
Crack Growth ◽  
Three Dimensional ◽  
High Fidelity ◽  
Probabilistic Prediction ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Utilizing inverse uncertainty quantification techniques, structural health monitoring (SHM) can be integrated with damage progression models to form a probabilistic prediction of a structure’s remaining useful life (RUL). However, damage evolution in realistic structures is physically complex. Accurately representing this behavior requires high-fidelity models which are typically computationally prohibitive. In this paper, high-fidelity fatigue crack growth simulation times are reduced by three orders of magnitude using a model based on a set of surrogate models trained via three-dimensional finite element analysis. The developed crack growth modeling approach is experimentally validated using SHM-based damage diagnosis data. A probabilistic prediction of RUL is formed for a metallic, single-edge notch tension specimen with a fatigue crack growing under mixed-mode conditions.

Three-Dimensional Finite Element Simulations of Elastic and Elastic-Plastic Crack Growth Using Automated Re-Meshing Techniques

2014 ◽  
Author(s):  
Tyler London ◽  
Simon D. Smith ◽  
Şefika Elvin Eren
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Three Dimensional ◽  
Offshore Structures ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Dimensional Finite Element ◽  
Elastic Crack ◽  
Stability And Accuracy ◽  
Three Dimensional Finite Element

This paper concerns the numerical simulation of elastic and elastic-plastic crack growth in welded components. Three-dimensional, spline-based, automatic crack re-meshing algorithms have been developed at TWI to simulate crack propagation using the commercial finite element analysis software ABAQUS. These methods allow for fatigue crack growth simulations employing the Paris law, mean stress effects and more advanced elastic crack growth laws, and incorporate nodal release techniques or iterative stationary crack methods coupled with experimentally measured tearing resistance curves for elastic-plastic crack growth. The flexibility, stability and accuracy of these numerical methods are demonstrated through several examples. The application of the crack growth simulations to full-life engineering critical assessments (ECA) of offshore structures is also described and demonstrated.

Axisymmetric Finite Element Modeling of Block Pavement Subjected to Repeated Loading

2000 ◽  
Vol 1730 (1) ◽  
pp. 53-63
Author(s):  
Koon Meng Chua ◽  
Zehra Askree ◽  
Brian Shackel
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Concrete Block ◽  
Repeated Loading ◽  
Element Analysis ◽  
Solid Of Revolution ◽  
Straight Beam ◽  
Dimensional Finite Element ◽  
Updated Lagrangian ◽  
Three Dimensional Finite Element

A two-dimensional finite element code, PAVE2D, is used to model a concrete block pavement as a solid of revolution. However, use of this approach in its normal form poses a difficulty—the relatively stiff elements near the axis of revolution cannot rotate. It is proposed that the stiffness of these elements be modified to allow some degree of rotation that would still give a reasonable state of stress. This is done by determining a ratio of the modulus of a flat circular plate and that of a straight beam of equal span and thickness that would give an equal rotation along the entire span. This ratio is used to reduce the modulus of the elements representing the concrete blocks according to their proximity from the axis of revolution. PAVE2D is a large deformation capable code that has an updated Lagrangian formulation. The proposed method has an advantage over the traditional three-dimensional finite element analysis because it accommodates stress-related nonlinearity and geometric nonlinearity, and it is capable of simulating loading and unloading without huge computing resource requirements. The computer simulations shown include modeling a field test in which a 70-mm-thick block pavement was subjected to loading from a falling weight deflectometer and modeling block pavements 80 mm and 120 mm thick subjected to repeated loading. The proposed method can be used to evaluate different block shapes and arrangements and can be used to predict rutting characteristics of these pavements. The method applies to rigid pavement.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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