With the development and application of highway-speed nondestructive testing (NDT) devices, a reliable method to evaluate current level deterioration pavements from measured results is necessary provide comprehensive timely maintenance rehabilitation decisions for pavements. The objective this study conditions flexible their deflection profiles under moving loads. due primarily growth microcrac...

A crack trapping model is developed for the fracture resistance of high-angle grain boundaries in free-standing brittle thin films, based on which a new size effect is predicted. In addition to the crystallographic misorientations, the grain boundary toughness is also dependent on the film thickness, primarily due to the geometrically necessary crack front branching. 2007 Elsevier Ltd. All righ...

The reason for instability in a rock mass with weak interlayer is not only the sliding failure of structural plane but also tip crack propagation caused by stress concentration at interlayer. In this study, uniaxial compression test an anchored was carried out to determine influence anchorage on pattern and strength samples different dip angles. addition, coupled DEM–FEM numerical simulation me...

The structural reliability of many brittle materials such as structural ceramics relies on the occurrence of intergranular, as opposed to transgranular, fracture in order to induce toughening by grain bridging. For a constant grain boundary strength and grain boundary toughness, the current work examines the role of grain strength, grain toughness, and grain angle in promoting intergranular fra...

sudden fracture is one of the major failure modes in brittle materials. plexiglass (polymethyl methacrylate) is a well known brittle polymer, widely used in various industries. many types of notches, particularly v-shaped notches, are sometimes used in the components made of plexiglass. these notches can dramatically decrease the load bearing capacity of components due to the concentration of s...

The fatigue behaviour of single lap bonded joints under fatigue loading was already investigated and a suitable life prediction model was presented and validated [1-2]. The model is based on the actual damage evolution under fatigue load: a crack initiation followed by its propagation up to a critical length [2, 3]. In the present paper the evolution of fatigue damage in single lap joints is ex...

The deformation and crack initiation mechanisms were analyzed in a textured AZ31B-O Mg alloy subjected to fully-reversed, strain-controlled cyclic along the rolling direction after 50 cycles (approximately 33% of fatigue life). Distinct bands corresponding pyramidal slip or tensile twins found 538 grains out 2100 grains. Slip trace analysis showed that 72.3% 18.4% twin boundaries. Both twinning...

The effects of orientation on fatigue crack propagation Ni3Al alloys under the super-gravity condition were studied by using molecular dynamics method. research found that initiation and mechanisms different for models: [001](010) germinated in form blunting damage voids [1̄10](110) began as slip bands. For [112̄](111) crack, same crack. In stage, main deformation all models bands, but directions...

ÐBy incorporating the e€ects of interfacial adhesion in the mechanics of rounded contact between two bodies, a new approach is proposed for the quantitative analysis of a wide variety of contact fatigue situations involving cyclic normal, tangential or torsional loading. In this method, conditions of ``strong'' and ``weak'' adhesion are identi®ed by relating contact mechanics and fracture mecha...