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American Society for Testing and Materials

http://autonomic.beckman.illinois.edu/files/publications_papers/2005_Brown_Fatigue_Part_II.pdf

Retardation and repair of fatigue cracks in a microcapsule toughened epoxy composite—Part II: In situ self-healing

Fiber-reinforced asphalt-concrete – A review

A viscoelastic continuum damage model and its application to uniaxial behavior of asphalt concrete

This paper investigates the effect of the processes on fatigue fracture and fracture healing during controlled-strain, dynamic mechanical analysis (DMA) testing. Sand asphalt samples were fabricated with two SHRP-classified binders: AAD-1 and AAM-1. DMA testing was performed at 25°C and at 10 Hz. The mechanical response during DMA testing was monitored using three different damage indicators: (1) change in dynamic modulus; (2) change in pseudo stiffness; and (3) change in dissipated strain energy. When either of these parameters are plotted versus the number of load cycles, two inflection points are apparent that define a significant change in sample behavior due to damage. The second inflection point is a reasonable definition of failure, as it is strongly correlated with the peak of the plot of phase angle versus load repetitions. Furthermore, the phase angle drops precipitously at the second inflection point. By performing controlled-strain torsional fatigue tests at three different strain levels, each great enough to induce damage, a reproducible fatigue relationship (number of load cycles as a function of stress level) is developed. The introduction of several rest periods during testing lengthened fatigue life. Successful development of this testing method is suggested as a potential specification-type test method because of its efficiency, reproducibility, and reliability.

Fatigue and healing characterization of asphalt mixtures

Contributors Chapter 1. Modeling of Asphalt Concrete Part 1: Asphalt Rheology Chapter 2. Modeling of Asphalt Binder Rheology and Its Application to Modified Binders Part 2: Stiffness Characterization Chapter 3. Comprehensive Overview of the Stiffness Characterization of Asphalt Concrete Chapter 4. Complex Modulus Characterization of Asphalt Concrete Chapter 5. Complex Modulus from the Indirect Tension Test Chapter 6. Interrelationships among Asphalt Concrete Stiffnesses Part 3: Constitutive Models Chapter 7. VEPCD Modeling of Asphalt Concrete with Growing Damage Chapter 8. Unified Disturbed State Constitutive Modeling of Asphalt Concrete Chapter 9. DBN Law for the Thermo-Visco-Elasto-Plastic Behavior of Asphalt Concrete Part 4: Models for Rutting Chapter 10. Rutting Characterization of Asphalt Concrete Using Simple Shear Tests Chapter 11. Permanent Deformation Assessment for Asphalt Concrete Pavement and Mixture Design Part 5: Models for Fatigue Cracking and Moisture Damage Chapter 12. Micromechanics Modeling of Performance of Asphalt Concrete Based on Surface Energy Chapter 13. Field Evaluation of Moisture Damage in Asphalt Concrete Part 6: Models for Low-Temperature Cracking Chapter 14. Prediction of Thermal Cracking with TCMODEL Chapter 15. Low-Temperature Fracture in Asphalt Binders, Mastics, and Mixtures Index

Modeling of Asphalt Concrete

This paper presents a mechanistic approach to constitutive modeling of asphalt concrete under complicated repetitive loading conditions with rest periods. From an extensive literature review, two m...

One-dimensional constitutive modeling of asphalt concrete

A viscoelastic constitutive model of asphalt mixtures that accounts for the rate-dependent damage growth and microdamage healing is presented in this paper. An elastic continuum damage model, which is based on thermodynamics of irreversible processes with internal state variables, is first reviewed and extended to a corresponding viscoelastic model using an elastic-viscoelastic correspondence principle. A rate-type internal state evolution law is employed to describe the damage growth and microdamage healing in asphalt concrete. An analytical representation of the model is established for the uniaxial loading condition. Tensile uniaxial cyclic tests were performed under the controlled-strain mode with different strain amplitudes to determine model parameters. The resulting constitutive model successfully predicts the damage growth and recovery in asphalt concrete under multilevels of loading, varying rates of loading, different modes of loading (controlled-strain and controlled-stress), and random rest periods.

Viscoelastic Continuum Damage Model of Asphalt Concrete with Healing

Modelling the performance of asphalt concrete using continuum damage theories is an approach that has gained international attention in recent years. These types of models are advantageous because they ignore many of the complicated physical interactions at the microscale level and instead characterise a material using macroscale observations. One such model, the viscoelastic continuum damage model, is used in this study to examine the fatigue performance of asphalt concrete mixtures. A mathematically rigorous exploration is undertaken to specialise the model for easy prediction and characterisation using cyclic fatigue tests on cylindrical specimens. This process reveals that certain theoretical shortcomings are evident in other similar models and corrects them with a newly developed model. The resulting model is capable of capturing the underlying material property, i.e. the damage characteristic curve, which is responsible for the performance of controlled stress, controlled crosshead strain and consta...

Y. Richard Kim

Papers

A viscoelastic continuum damage model and its application to uniaxial behavior of asphalt concrete

Modeling of Asphalt Concrete

One-dimensional constitutive modeling of asphalt concrete

Viscoelastic Continuum Damage Model of Asphalt Concrete with Healing

Improved calculation method of damage parameter in viscoelastic continuum damage model