a new dynamic friction model for modeling of elliptical vibration assisted turning (evat) was developed in this research. the periodic change of the friction force direction is known to be one of the most important causes of this phenomenon. in modeling of machining processes (including the evat process), static coulomb friction model was employed by most of the researchers. because of the peri...

Two series of experiments are performed to investigate the dynamic response of various essential components of a class of sandwich structures, under high-rate inertial loads. One consists of dynamic inertia tests and the other involves dynamic impact tests. A split Hopkinson bar apparatus is modified and used for these experiments. First, the energy-absorbing characteristics of the plate materi...

Monitoring the degradation of dynamic elastic modulus (Ed) concrete is great importance to track durability deterioration for hydraulic structures. For aqueduct under investigation in this study, bent frames and moment frame supports (Ed-frame), arch trusses (Ed-arch) shear stiffnesses asphaltic bearings U-shaped flumes (Kflume) are main parameters define behavior structure, which have direct c...

Abstract The increase of pore water pressure under a dynamic load is an important reason for the vibration liquefaction saturated sand. Therefore, studying model tailings sand plays role in seismic analysis ponds. In this paper, development characteristics fine and silt pond with centerline method are studied by triaxial tests. research results show that ratio shows trend "rising–smooth–rising"...

In the Mechanistic–Empirical Pavement Design Guide (MEPDG), dynamic modulus of asphalt mixes is used as one of the input parameters in pavement analysis and design. For in-service pavements, MEPDG method uses a combination of some field and laboratory tests for structural evaluation of asphalt layers in rehabilitation projects. In this study, ten new and rehabilitated in-service asphalt pavemen...

the effects of carbon content on the dynamic and static softening mechanisms of ti microalloy steels were investigated both in ferrite and austenite regions. the results obtained showed that recrystallization rate decreased as the percentage of carbon content was increased from 0.0035 to 0.110. this is due to the ti(cn) and tic precipitates and also the free carbon content. in the ferrite regio...