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The Mode II crack propagation for in-plane shear loading is shown in Figure 4. Svetlizky and Fineberg investigated the onset of frictional sliding between two polymethylmethacrylate (PMMA) blocks by measuring the real area of contact A r and strain fields near the interface between the blocks. They found that the stress distribution at the. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract. We perform real-time measurements of the net contact area between two blocks of like material at the onset of frictional slip. We show that the process of interface detachment, which immediately precedes the inception of frictional sliding, is governed by three different types of detachment fronts. In geology, numerical modeling is a widely applied technique to tackle complex geological problems by computational simulation of geological scenarios. Numerical modeling uses mathematical models to describe the physical conditions of geological scenarios using numbers and equations.

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• This model frictional forces operate when the crack faces are open. Therefore, these forces are different from those operating in a contact problem. In this context Karihaloo & Xiao (2008) obtained asymptotic expansions at a cohe-sive crack tip analogous to the Williams (1957) expansions at a traction-free.
• Mode III crack growth in turbo-generator shafts often results in a fracture surface morphology resembling a factory roof. The interactions of the mutual fracture surfaces result in a pressure, and a frictional stress field between fracture surfaces when the shaft is subjected to torsion.

A Study on Second Mode Stress Intensity Factor (KII) of Cracked Plates Under Compression Load

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Abstract

A two-dimensional finite element method for analysis and determination of second modestress intensity factor (KII) of several crack configurations in plates under uniaxialcompression is presented in this study. Various cases including diagonal crack (i.e. cornercrack, central crack as well as at different locations on the diagonal) and central kinked crackare investigated with different crack's length, orientation and location. The influence of thecontact between two crack surfaces is taken into account by applying contact elementprocedure with desired friction coefficient. The stress intensity factor is calculated by a cracksurface displacement extrapolation technique. From the obtained results of the analysis it isfound that, the corner cracked plates more dangerous than the other cracked plates, since ithas the highest stress intensity factor. Also, the length and orientation of the kinked crackhave significant effects on the stress intensity factor. The results of this investigation isillustrated graphically, exposing some novel knowledge about the stress intensity factor andits dependence on crack configuration.

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Abstract

Dynamic sliding along incoherent (frictional) interfaces is investigated experimentally in a microsecond time scale. A bimaterial system comprised of Homalite and steel plates and a homogeneous system consisting of two Homalite plates are considered. The plates are held together by a uniform compressive stress while dynamic sliding is initiated by an impact-induced shear loading. The evolution of maximum shear stress contours is recorded by high-speed photography in conjunction with dynamic photoelasticity. Simultaneously with photoelasticity, a newly-developed technique based on laser interferometry is employed to locally measure the sliding speed at the interface. Knight swap download free pc.

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The response of the Homalite-steel bimaterial system differs according to whether the impact loading is applied to the Homalite plate or to the steel plate. In the first case, a disturbance traveling along the interface at a constant speed close to the Rayleigh wave speed of steel generates a shear Mach line crossing the P-wave front. Sliding initiates behind the P-wave front in the Homalite plate and it propagates at a supershear speed with respect to the shear wave speed of Homalite. A disturbance, traveling at constant speeds between the shear wave speed and the longitudinal wave speed of Homalite, appears behind the sliding tip. Wrinkle-like opening pulses, propagating along the bimaterial interface at a constant speed between the Rayleigh wave and the shear wave speed of Homalite, are also observed. When the impact loading is applied to the steel plate, sliding at a given point initiates with the arrival of the P-wave front there, so that the rupture is sonic with respect to steel and supersonic with respect to Homalite.

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In all the experiments performed on the bimaterial structure (Homalite-steel), sliding always occurred in a crack-like mode. In the case of a homogeneous system of Homalite plates however, direct physical evidence of different modes of sliding is recorded. Crack-like sliding, pulse-like sliding and mixed mode sliding in the form of pulses followed by a crack are discovered. Supersonic trailing pulses are also recorded. Behind the sliding tip, wrinkle-like opening pulses are developed for a wide range of impact speeds and confining stresses.