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Integrated Fracture Modeling and Testing Approach University of Illinois Research Update E1E1 E5E5 1 5 (c) Field Data and Performance (d) Lab Testing(a)

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Presentation on theme: "Integrated Fracture Modeling and Testing Approach University of Illinois Research Update E1E1 E5E5 1 5 (c) Field Data and Performance (d) Lab Testing(a)"— Presentation transcript:

1 Integrated Fracture Modeling and Testing Approach University of Illinois Research Update E1E1 E5E5 1 5 (c) Field Data and Performance (d) Lab Testing(a) Fracture Behavior (b) Bulk Material Response Computer Simulation 1 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 –Users guide with numerical examples that can be used to verify that the program is working properly 2

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

4 TCModel vs. New 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 TCModel New TCModel Stress Intensity Factor Far-field stress at depth of crack Current crack length Change in crack depth Change in stress intensity factor Fracture parameters Bilinear cohesive zone model 4

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 5

6 New TCModel Status Completed 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 6

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 7

8 Visual LTC User Types –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 Standard UserAdvanced User Similar to existing MEPDG layout User can easily switch between user types 8

9 Visual LTC 9

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

11 Questions? 11 A B t A B Cohesive Zone


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