Brittle Tensile Fracture

Hearle, J.W.S.; Lomas, B.; Cooke, W. D.

doi:10.1533/9781845691271.2.37

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“…These two directions usually coincide to give circumferential cracks when the fiber is under stress during alkaline hydrolysis. 33 Further, circumferential cracks occur during aqueous alkaline treatment in the loading condition when the load exceeds the yield load due to the transformational changes of the fiber. 24,34 This conformational change exerts strain on the ester bonds that break easily due to the weakest bond energy of C-O in the ester bond.…”

Section: Scanning Electron Micrographsmentioning

confidence: 99%

In vitro study of poly(ethylene terephthalate) implants for long-term durability

Rahman

2013

Textile Research Journal

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In vitro investigation was carried out using two loading conditions (applied and pre-loading) and three aqueous chemicals to study the in vivo formation of longitudinal and circumferential cracks in poly(ethylene terephthalate) or PET implants. Scanning electron microscopy determined that in vivo formation of longitudinal cracks can be detected by treating the PET with aqueous NaOH in relaxed and loading conditions; both longitudinal and circumferential cracks can be detected by treating the PET with aqueous NaOH under applied and pre-loading conditions above the yield load. The detected longitudinal and circumferential cracks were similar to those found in PET implants in vivo. Treatments using acid and ammonium hydroxide did not produce any longitudinal or circumferential cracks either in relaxed (zero load) or applied loading conditions. The calculated lifetime was approximately 50 years under zero applied loading conditions and pH of 10–11. The major contributing factor for the premature rupture of medical-grade PET implants resulting in numerous human deaths was physiological load.

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Section: Scanning Electron Micrographsmentioning

confidence: 99%

In vitro study of poly(ethylene terephthalate) implants for long-term durability

Rahman

2013

Textile Research Journal

View full text Add to dashboard Cite

show abstract

Brittle Tensile Fracture

Cited by 1 publication

References 0 publications

In vitro study of poly(ethylene terephthalate) implants for long-term durability

In vitro study of poly(ethylene terephthalate) implants for long-term durability

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