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(a) Fracture Behavior Computer Simulation (d) Lab Testing

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Presentation on theme: "(a) Fracture Behavior Computer Simulation (d) Lab Testing"— Presentation transcript:

1 Integrated Fracture Modeling and Testing Approach University of Illinois Research Update
(a) Fracture Behavior Computer Simulation (d) Lab Testing (b) Bulk Material Response (c) Field Data and Performance E1 E5 1 5 Bill Buttlar, Glaucio Paulino, Eshan Dave, and Sofie Leon November 18, 2009 – Mn/ROAD Maplewood Lab

2 Review: Task-4 Develop and validate mixture specification for low-temperature cracking: Level-I: Mixture fracture test Level-II: Mixture tests + Modeling Fracture + Creep + CTE Task-4: An executable code that can either be run standalone or in conjunction with the MEPDG User-friendly interfaces for data input and presentation of results User’s guide with numerical examples that can be used to verify that the program is working properly

3 Level-I, Example (Phase-I)
Mn/ROAD Section-35

4 TCModel vs. New TCModel TCModel Stress Intensity Factor Model
Fracture Model: Paris Law Crack Amount Model Amount of cracking is a function of the probability that the crack depth is equal to or greater the thickness of the surface layer Finite Element Based Thermal Cracking Prediction Model with Cohesive Zone Modeling Stress Intensity Factor Far-field stress at depth of crack Current crack length Change in crack depth Change in stress intensity factor Fracture parameters Add fracture energy and tensile strength discussion Bilinear cohesive zone model

5 New TCModel Features Multiple HMA lifts
Viscoelastic bulk material behavior IDT creep properties Cohesive zone fracture model Recommended model from the phase-I results Uses fracture test results Finite element analysis engine Includes mesh generator Non-linear solver Similar climatic model as MEPDG

6 New TCModel Status Completed Tasks Tasks underway Future Tasks
Finite element analysis code (testing is underway) Mesh generator Tasks underway Viscoelastic analysis code (formulations are developed, implementation underway) Temperature boundary condition selection Future Tasks Testing of code with all components Verification and calibration Integration with User Interface (Visual LTC*) *Developed under NexTrans supplementary study by Sofie Leon

7 Visual LTC Analysis Tool Developed on NexTrans Supplementary Project
User-friendly graphical user interface (GUI) to capture low temperature cracking characteristics of asphalt concrete Allows for quick yet sophisticated analysis for practical applications Currently, it is utilizing TCModel (MEPDG) New TCModel will be linked as soon as implementation and testing is complete Add visual LTC is a GUI linking stuff

8 Visual LTC User Types Standard User Advanced User
Similar to existing MEPDG layout User can easily switch between user types Standard User Advanced User Practitioners Access to all existing mixes Default mix properties can be viewed but not changed Researchers/Developers Access to all existing mixes Default mix properties can be viewed and changed Modify existing mixes and add new mixes Differentiate between 3rd bullets

9 Visual LTC

10 Visual LTC Results Crack depth with time Amount of cracking with time

11 Questions? Cohesive Zone A B A B t

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