The components of the learning system

Saleemi, Anjum P.

doi:10.1017/cbo9780511753237.004

Cited by 1 publication

(1 citation statement)

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“…To generate a state of pure plane-stress, the ligament length must be greater than three to five times the specimen thickness (6,7). Moreover, in order to avoid the plastic zone's being disturbed by edge effects and to ensure complete yielding of the ligament before the crack starts to propagate, the ligament length should be less than one third of the specimen width or less than the plastic zone size, whichever is the lower (8).…”

Section: W= We+ W Pmentioning

confidence: 99%

Determination of the fracture toughness of thermoformed polypropylene cups by the essential work method

Pegoretti

Marchi

Riccò

1997

Polymer Engineering & Sci

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In this work the anisotropic fracture behavior of neat and rubber‐modified polypropylene cups induced by a vacuum thermoforming process is studied. The effect of different draw‐ratios is also examined. An elasto‐plastic fracture mechanics approach, based on the method of the essential work of fracture, is applied to samples cut from the thermoformed cups both longitudinally and transversally to the drawing direction. For all the products examined a strong anisotropy in the fracture behavior is observed. The fracture resistance for cracks propagating along the drawing direction is lower than in the transverse direction, this fracture anisotropy being enhanced at higher draw‐ratio. The presence of the rubber particles results in an increase in the fracture toughness for cracks running transversally to the drawing direction, but, at the same time, it seriously reduces the fracture resistance for cracks propagating along the drawing direction. In order to better understand the dependence of the fracture behavior upon the processing conditions and material structure, dynamic mechanical thermal analysis, transmission electron microscopy, and X‐ray diffraction measurements are also carried out.

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Section: W= We+ W Pmentioning

confidence: 99%