Modeling Fatigue Cracking of Asphalt Concrete Mixtures Using Viscoelastic Continuum Damage Theory and Finite Element Analysis

The development of advanced material characterization models and their implementation in finite element analysis (FEA) using sound structural models can lead to efficient design and maintenance alternatives for asphalt pavements. Particularly, characterization of asphalt concrete in tension is a crucial element for accurate prediction of cracking distresses. A viscoelastic continuum damage model (VECD) based on: (1) the elastic-viscoelastic correspondence principle using pseudostrains; (2) the work potential theory for damage modeling; and (3) the time-temperature superposition principle with growing damage has recently been developed and continuously refined. This study incorporates the VECD in a user developed FEA module to predict responses of an asphalt pavement structure. Complex modulus testing was performed for obtaining linear viscoelastic properties of asphalt concrete mixtures, while monotonic tensile strength tests were conducted for obtaining the model's damage parameters. The model was verified by using FEA for a series of loading conditions and temperatures, which were used in laboratory testing. The predictions of deformations were very close to those measured from the laboratory tests.

並列關鍵字

Asphalt ； Complex Modulus ； Continuum Damage ； Linear Viscoelasticity

國際替代計量

全文下載

主題瀏覽