Hydrostatic stress

About: Hydrostatic stress is a research topic. Over the lifetime, 1568 publications have been published within this topic receiving 37773 citations.

Determination of Axial Stress in Clad Glass Fibers

Abstract: The axial stress in clad glass fibers was measured by photoelastic techniques and compared with calculated values. In general, there was good agreement when the hydrostatic stress development was included in the calculation. The systems studied were primarily those which would produce a surface compression. Fibers of a soda-lime-silica glass clad with a high-silica glass gave the largest surface compression, 46,000 psi.

Critical stress criteria for interfacial cavitation in MMCs

Abstract: Density measurements and microstructural examinations have been used to follow the formation, growth and coalescence of cavities during tensile loading of metal matrix composites (MMCs). Finite element modelling has been used to predict the stress states around reinforcements of various shapes. The positions of peak hydrostatic and normal stress components at the interface have been compared with the microstructural sites where voids were found to form experimentally in aluminium reinforced with alumina particles or fibres. It is concluded that cavities form when a critical hydrostatic stress is reached.

Fracture and yield behavior of adhesively bonded joints under triaxial stress conditions

Abstract: Most of adhesively bonded joints are under complicatedly distributed triaxial stress in the adhesive layer. For the estimating of the strength of adhesively bonded joints, it is crucial to clarify behavior of yield and failure of the adhesives layer under triaxial stress conditions. Two types of the adhesively bonded joints were used in this study: One is the scarf joint which is under considerably uniform normal and shear stresses in the adhesive layer, where their combination ratio can be varied with scarf angle. The other is the butt joint with thin wall tube in which considerably uniform pure shear can be realized in the adhesive layer under torsional load conditions. These joints can cover the stress triaxiality in adhesive layers of most joints in industrial application. The effect of stress triaxiality on the yield and fracture stresses in the adhesive layer were investigated using the joints bonded by three kinds of adhesives in heterogeneous and homogeneous systems. The results showed that both the yield and failure criterion depend on the stress triaxiality and that the fracture mechanism of the homogeneous adhesive is different from that of the heterogeneous one. From these experimental results, a method of estimating the yield and failure stresses was proposed in terms of a stress triaxiality parameter.

33 State of stress within the earth

Abstract: Stress is the continuum equivalent of force. Any mechanical process in the solid or fluid parts of the Earth must involve stress. Plate tectonics, earthquakes, volcanic eruptions, glacial rebound, landslides, tidal deformation, phase changes, fluid flow, rock folding, and crystallization are examples of some of the processes that generate, modify, and consume stress within the Earth. Essentially, stress makes geologic processes happen, and geologic processes make stress. This chapter discusses the basic definition of stress and provides a simplified view of rock strength. It emphasizes on some recent trends in stress studies. The stress state can be mainly divided into two parts: pressure and shear stress. The most important aspect of stress state is the difference between shear stress and failure stress levels. The support of gravitational loads on and within the Earth provides constraints on minimum shear stress levels. The stress state that emerges from these constraints is that plate interiors may have high levels of shear stress, but that plate boundaries and other major active faults have low shear stress.