Based on the coupled thermo-mechanical model, a constitutive model for bulk metallic glasses (BMGs), which is generalized to the multi-axial stress state and considers the effects of free volume, heat and hydrostatic stress, has been modified in the present paper. Besides, a failure criterion of critical free volume concentration is introduced based on the coalescence mechanism of free volume. ...

With the use of the Laplace integral transformation and state space formalism, the classical axial symmetric quasistatic problem of viscoelastic solids is discussed. By employing the method of separation of variables, the governing equations under Hamiltonian system are established, and hence, general solutions including the zero eigensolutions and nonzero eigensolutions are obtained analytical...

The prediction and prevention· of mine disasters are crucial to identifying the stress strain state coal using ultrasonic response characteristics. In this study, testing experiments primary structure samples under uniaxial loading were conducted a low-frequency rock physics measuring device. Based on experimental results, study focused analyzing relationship stress–strain with velocity quality...

Taking a large grid frame in maintenance hangar of Guangzhou Baiyun Airport as the research object, construction steps lifting structure are briefly described, and static mechanical characteristics, dynamic characteristics stability were studied by using Midas/Civil finite element analysis software, which meets design practical application requirements. Since its first six orders safety factors...

Abstract Multi-axial compression of the mushy zone occurs in various pressurized casting processes. Here, we present a drained triaxial apparatus for semi-solid alloys that allow liquid to be drawn into or expelled from sample response isotropic compression. The rig is used measure pressure-dependent flow stress and volumetric during isothermal globular Al-15 wt pct Cu at 70 85 vol solid. Analy...

Adhesive lap joints are widely used in modern structures. Known analytical mathematical models of the stress state describe straight beams or cylindrical coaxial pipes. It is assumed that these structures depends on only one coordinate. The study plates with defects, which reinforced by patches, most cases requires use at least two-dimensional models. In this work, it shown axial symmetry plate...

This paper studies the nonlinear vibration analysis of a simply supported Euler-Bernoulli beam resting on a nonlinear elastic foundation under compressive axial load using nonlinear normal modes concept in the case of three-to-one (3:1) internal resonance. The beam’s governing nonlinear PDE of motion and also its boundary conditions are derived and then solved using the method of Multiple Time ...

This article presents new intramedullary (IM) nail design for femur diaphyseal fractures osteosynthesis. Biomechanical comparison of the two IM nails (standard locking and new developed) was conducted. Femur medullary canal architectonics was studied with the help of computer tomography (CT) data. Three-dimensional (3D) models of the femur, its transverse fracture, standard locking nail and new...

A mathematical analysis has been carried out for the axial flow of a Bingham plastic fluid, in the Concentric Cylinder Viscometer which consists of a cylindrical sample holder (the cup) and a cylindrical spindle (the bob) coaxial with the cup. The fluid to be tested flows through the annular gap of the cup and the bob system, sheared by the rotation of the inner cylinder, while the outer cy...

The mechanics of cracking in fiber-reinforced ceramic matrix composites (CMCs) under general loadings remains incomplete. The present paper addresses one outstanding aspect of this problem: the development of matrix cracks in unidirectional plies under shear loading. To this end, we develop a model based on potential energy differences upstream and downstream of a fully bridged steady-state mat...