Results 251 to 260 of about 315,467 (296)

The plane strain fracture of polysulfone

Engineering Fracture Mechanics, 1974
Abstract It is shown using photoelastic techniques that the concepts of fracture mechanics apply to the plain strain fracture of isotropic polysulfone, a ductile glassy polymer. This forms a yielded zone, consisting of crazes, ahead of the crack, that can be described by the Dugdale model.
R.D.R. Gales, N.J. Mills
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Instability of Plastic Strain and Fracture. Strain Diagram for Inhomogeneous Media

Journal of Applied Mechanics and Technical Physics, 2000
A strain diagram for a locally inhomogeneous medium (a medium with a porous structure or a system with noncut particles) is constructed on the basis of the Cosserat nonlinear pseudocontinuum model. A modified criterion of geometrical softening is considered that makes it possible to establish the dependence of the moment of stability loss on the ...
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The strain rate dependency of fracture in polyethylene: Fracture initiation

Journal of Applied Polymer Science, 1989
AbstractThe dependency of fracture on the rate of strain of a range of polyethylene samples was measured in three point flexural tests at 23°C. The range of strain rates from 10−1 to 10−7 reciprocal seconds was examined. The J integrals at the initiation of the cracks were determined.
D. B. Barry, O. Delatycki
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Plane strain cumulative fracture

International Journal of Fracture, 1982
By analysing appropriate models, the condition for plane strain crack propagation at a constant crack tip stress intensity factor (cumulative fracture) is shown to be dependent on the amount of plastic deformation per crack extension increment, and the yield stress. The results are relevant to the problem of environmentally assisted crack growth.
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Fracture mechanism of amorphous polymers at strain fields

Phys. Chem. Chem. Phys., 2014
Owing to the wide application of polymeric materials, understanding the fracture mechanism of amorphous polymers at strain fields is a fundamentally important challenge. In this work, we use molecular dynamics simulations to investigate the uniaxial deformation of amorphous polyethylene and further monitor the polyethylene fracture process induced by ...
Lan, Huang, Xiaoping, Yang, Xiaolong, Jia, Dapeng, Cao   +3 more
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A simple assumed-strain quadrilateral shell element for finite strains and fracture

Engineering with Computers, 2014
This work recovers an established technique for improving quadrilateral shell element performance in both out-of-plane and in-plane bending cases using a mixed formulation. A four-field variational principle is established and we relate, at the discrete level, the Lagrange multipliers and secondary right Cauchy---Green field with the displacement and ...
Pedro Areias, José M. César de Sá, Rui Cardoso   +2 more
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Fracture Patterns and Strain Information in Thoracolumbar Burst Fractures

Advances in Bioengineering, 2000
Abstract A combined loading of axial compression and anterior shear on a spinal motion segment causes the severe form of burst fracture. Thoracolumbar motion segments were instrumented with a strain gage on the middle of the anterior wall and one near the base of the pedicles. Two samples were subjected to high-speed axial compression in
Noshir A. Langrana, Robert D. Harten, David C. Lin, Mitchell F. Reiter, Casey K. Lee   +4 more
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Fracture strains in sheet metalforming and specific essential work of fracture

Engineering Fracture Mechanics, 1987
Abstract It is proposed that a plausible relationship exists between the specific essential work of fracture (R) obtained from testpieces incorporating starter cracks and the work required locally to nucleate a crack in flawless thin sheet metals.
A.G. Atkins, Y.W. Mai
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Strain-rate dependent fracture initiation

International Journal of Fracture, 1980
The theory of linear elastic dynamic fracture mechanics for Heaviside loading of an isolated crack is employed to formulate the response to constant strain-rate loading of a single crack. Numerical integration of the Heaviside solution is shown to lead to fracture initiation stresses that are dependent upon the imposed strain rate.
M. E. Kipp, D. E. Grady, E. P. Chen
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A microstructural interpretation of the fracture strain and characteristics fracture distance

Scripta Metallurgica, 1984
Fracture toughness is a function of both the spacing of the primary inclusions and the extent of growth of the voids nucleated at these inclusions. Only by includng the effect of void growth can the high toughness of the HP 9-4-20 be understood. The HP 9-4-20 and the base + Ni + Si steel have comparable values of X /SUB O/ , but the higher toughness of
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