Results 261 to 270 of about 445,228 (283)

Easily Cracked: Scientific Instruments in States of Disrepair

Isis, 2011
There has been much scholarly attention to definitions of the term "scientific instrument." Rather more mundane work by makers, curators, and users is devoted to instruments' maintenance and repair. A familiar argument holds that when a tool breaks, its character and recalcitrance become evident. Much can be gained from historical study of instruments'
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Crack deflection in a biaxial stress state

International Journal of Fracture, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Leguillon, Dominique, Murer, Sébastien
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Stress state of isotropic layer with crack

International Applied Mechanics, 1997
Stress of the isotropic layer with a through finite crack is investigated in three-dimensional statement. The layer faces remain plane while the crack surface is exposed to a normal stress. The problem is solved by the methods of uniform solution and two-dimensional Fourier transform. Direct numerical methods are applied to solve the obtained system of
Altukhov, E. V., Goltzev, A. S., Khizhnyak, V. K.   +2 more
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On crack propagation in orthotropic media for degenerate states

European Journal of Mechanics - A/Solids, 2004
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
GENTILINI, CRISTINA, PIVA, ALDINO, VIOLA, ERASMO   +2 more
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Mixed-Mode Crack Patterns in Ordinary State-Based Peridynamics

Key Engineering Materials, 2015
A new nonlocal theory of continuum, called Peridynamics, was introduced in 2000. While the classical theory of solid mechanics employs spatial derivatives in order to solve the motion equation and consequently requires the derivability of the displacement field, Peridynamics employs an integral formulation of the equation of motion which leads to the ...
SAREGO, GIULIA, ZACCARIOTTO, MIRCO, GALVANETTO, UGO   +2 more
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The theory of non-steady state fracture kinetics analysis—2: Non-steady state crack propagation in stress corrosion cracking

Engineering Fracture Mechanics, 1980
Abstract The extension of the kinetics theory of thermally activated crack propagation to the analysis of non-steady state conditions leads to a series of n homogeneous linear first order differential equations. The theory is applied to Regions I and II of stress corrosion cracking, controlled by the cyclically repeating two-step consecutive energy ...
A.S. Krausz, J. Mshana, K. Krausz
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United States cracks down on healthcare fraud

BMJ, 1997
The US president, Bill Clinton, has announced a crackdown on fraud and abuse in the healthcare system. The new legislation will prevent doctors who have been expelled from the Medicare system or had their licences revoked from moving elsewhere in the United States and continuing to be paid. Medicare fraud costs American taxpayers billions of dollars (
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A microscopic model of hydrogen-induced intergranular cracking—II. Steady state crack growth

Acta Metallurgica, 1986
Abstract A steady state model of hydrogen-induced intergranular crack growth has been developed. It is assumed that the steady state growth of an intergranular crack, screened by dislocations, is controlled by the grain boundary and crack surface diffusion processes of hydrogen.
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Fretting Fatigue Initial Damage State to Cracking State: Observations and Analysis

2003
Interrupted fretting fatigue experiments were performed to demonstrate the capabilities of a confocal microscope related to characterizing fretting damage and to correlate that damage with cycles to failure. Fretting damage was established at stepped down levels of 100% (baseline), 80%, 60%, 40%, 20%, and 10%.
PN Clark, DW Hoeppner
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Stress state of box-shaped shell with transverse cracks

Soviet Applied Mechanics, 1986
We use a representation of the structure as a system of linked thin plates obeying the Kirchhoff hypotheses and satisfying assumptions of the plane stress state problem to examine the deformation of an infinite box- shaped shell containing two transverse cracks. The cracks are modeled by rectilinear mathematical slits.
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