| Title |
Analysis of Static Crack Growth in Asphalt Concrete using the Extended Finite Element Method |
| Authors |
지광습 ; 유성문 ; Chau-Dinh Thanh ; 문성호 |
| Keywords |
asphalt;viscoelastic constitutive equation;extended finite element method;creep compliance;maxwell chain;partial moduli;아스팔트;점탄성 구성방정식;확장유한요소법;크리프 변형계수;맥스웰 체인;부분탄성계수 |
| Abstract |
This paper studies static crack growth of asphalt pavement using the extended finite element method (XFEM). To consider nonlinear characteristics of asphalt concrete, a viscoelastic constitutive equation using the Maxwell chain is used. And a linear cohesive crack model is used to regularize the crack. Instead of constructing the viscoelastic constitutive law from the Prony approximation of compliance and retardation time measured experimentally, we use a smooth log-power function which optimally fits experimental data and is infinitely differentiable. The partial moduli of the Maxwell chain from the log-power function make analysis easy because they change more smoothly in a more stable way than the ordinary method such as the least square method. Using the developed method, we can simulates the static crack growth test results satisfactorily. |