This article presents predictive modeling of nonlinear guided wave propagation for structural health monitoring using both finite element method and analytical approach. In our study, the nonlinearity of the guided waves is generated by interaction with a nonlinear breathing crack. Two nonlinear finite element method techniques are used to simulate the breathing crack: (a) element activation/de...

A general framework for probabilistic fatigue damage prognosis using maximum entropy concept is proposed in this paper. The fatigue damage is calculated using a physics-based crack growth model. Due to the stochastic nature of crack growth process, uncertainties arising from the underlying physical model, parameters of the model, and the measurement noise are considered and integrated into this...

An assessment of the plasticity-induced crack-closure concept is made, in light of some of the questions that have been raised on the validity of the concept, and the assumptions that have been made concerning crack-tip damage below the crack-opening stress. The impact of using other crack-tip parameters, such as the cyclic crack-tip displacement, to model crack-growth rate behavior was studied...

We present recent results on the modeling and numerical simulation of reservoir stimulation in Hot Dry Rocks. Our approach is based on a mechanistically faithful yet mathematically sound model, generalizing Griffith's idea of competition between bulk and surface energies. At each time increment, the fracture and displacement configuration of a reservoir is sought as the minimizer of a global en...

Abstract. Improved Giant MagnetoResistance Magnetometers (IGMRM) offers many advantages for subsurface cracks detection. This paper presents new detection opportunity of fatigue cracks close to fasteners or rivets with an improved rotating head. The latter was developed around an IGMRM and a well design electromagnetic flux focuser. The capabilities of the system for the one to the third alumin...

A theory is provided for piezoresistivity in carbon fiber reinforced cement (with and without embedded steel reinforcing bars) under flexure (three-point bending). The phenomenon, which involves the reversible increase of the tension surface electrical resistance and the reversible decrease of the compression surface electrical resistance upon flexure, allows strain sensing. The theory is based...

The phase field method is commonly used for the crack propagation modeling in modern material science, as they allow an implicit tracking of surface. However, most these models are homogeneous materials, and there exist only a few approaches heterogeneous systems. Recently, Schöller et al. [1] presented novel phase-field model multiphase e.g. composites, based on multi-crack order parameters. D...

Structural deterioration is becoming a major problem when considering long term performance of infrastructures. The existence of a corrosive environment, cyclic loading and concrete cracking cause structural strength degradation. The interaction of these conditions can only be taken into account when modeling the coupled action. In this paper, a new model to assess lifetime of RC structures sub...