Journal ArticleDOI
The essential work of plane stress ductile fracture of linear polyethylenes
TLDR
In this article, specific essential works of plane stress ductile tearing of polyethylenes were obtained from deeply edge-notched tension specimens, with either single or double notches, by extrapolating the straight line relationship between the total specific fracture work and ligament length to zero ligament.Abstract:
The specific essential works of plane stress ductile tearing of several high- and ultrahigh-molecular-weight polyethylenes were obtained from deeply edge-notched tension specimens, with either single or double notches, by extrapolating the straight line relationship between the total specific fracture work and ligament length to zero ligament. Provided the fracture morphologies of the torn ligament are not widely different, the specific essential work (we) is a material property dependent on thickness but independent of specimen geometry. The specific essential fracture work also can be identified with Jc the critical value of the J-integral along a contour immediately bordering the fracture process zone at the crack tip. There is good agreement between the experimental we values and theoretical Jc estimates for these polyethylene materials.read more
Citations
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Journal ArticleDOI
Failure mechanisms in toughened epoxy resins—A review
Amar C. Garg,Yiu-Wing Mai +1 more
TL;DR: A critical review of the existing theories that have been proposed for the various toughening mechanisms related to modified epoxy resins can be found in this article, where the failure mechanisms leading to the improvement in toughness are discussed.
Journal ArticleDOI
Deformation, yielding, fracture and fatigue behavior of conventional and highly cross-linked ultra high molecular weight polyethylene
TL;DR: The mechanical properties discussed include the deformation behavior of UHMWPE, the yielding associated with quasi-static tension and compression, fracture toughness, cyclic loading, and fatigue resistance.
Journal ArticleDOI
The essential fracture work concept for toughness measurement of ductile polymers
Jingshen Wu,Yiu-Wing Mai +1 more
TL;DR: In this article, the effects of geometry on the essential work of fracture and the plane-stress/plane-strain transition were studied, and it was shown that the specific essential work is a material constant, independent of sample geometry, and equivalent to the critical J-integral.
Essential fracture work concept for toughness measurement of ductile polymers
TL;DR: In this article, the effects of geometry on the essential work of fracture and the plane-stress/plane-strain transition were studied, and it was shown that the specific essential work is a material constant, independent of sample geometry, and equivalent to the critical J-integral.
Journal ArticleDOI
Essential work of fracture and j‐integral measurements for ductile polymers
Yiu-Wing Mai,Peter Powell +1 more
TL;DR: In this article, it was shown that specific essential fracture work (we), consisting of the energies dissipated in forming and tearing the neck, is a material property for a given sheet thickness and is independent of specimen geometry.
References
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Journal ArticleDOI
The essential work of plane stress ductile fracture
Brian Cotterell,J. K. Reddel +1 more
TL;DR: In this article, it was shown that the work performed in the end region at the tip of a crack, where the fracture process takes place, is considered the essential work of fracture, and a constant for a particular sheet thickness.
Journal ArticleDOI
On the essential work of ductile fracture in polymers
Yiu-Wing Mai,Brian Cotterell +1 more
TL;DR: In this article, it was shown that the straight line relationship between the total specific fracture work (wf) and ligament length (l) to zero ligament can break down when the ligament lengths to sheet thickness ratio is less than about three.
Journal ArticleDOI
Effect of specimen geometry on the essential work of plane stress ductile fracture
Yiu-Wing Mai,Brian Cotterell +1 more
TL;DR: In this article, the effect of specimen geometry on the specific essential work of fracture for a low-work hardening aluminium sheet metal alloy (AA2S) is investigated, and it is shown that the specific critical work at fracture initiation is independent of test peice geometries.
Journal ArticleDOI
Influence of the molecular weight of poly(methyl methacrylate) on fracture surface energy in notched tension
Robert P. Kusy,D.T. Turner +1 more
TL;DR: In this article, a theoretical dependence of fracture energy on molecular weight was derived on the assumption that only molecules exceeding a critical molecular weight can contribute to the work of plastic deformation.
Journal ArticleDOI
J andG canalysis of the tearing of a highly ductile polymer
J. M. Hodgkinson,J. G. Williams +1 more
TL;DR: In this article, the use of a conventional J analysis to describe the ductile tearing of thin low density polyethylene sheet is described and the current energy release rate to determine the local dissipation rate is then given and an initiation (plane strain) and reasonably constant propagation (plane stress) values are obtained.
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The essential fracture work concept for toughness measurement of ductile polymers
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