Crazing of polymers
WebMay 1, 1998 · In these applications, chemicals such as isopropanol and lipid solutions can initiate crazes—microcracks bridged by polymer fibrils—in the plastic and seriously compromise its mechanical integrity. Products like medical luers can be susceptible to crazing when under stress and exposed to aggressive chemicals. Photo: Eastman … WebMay 1, 2007 · Crazing is usually a precursor of the brittle fracture of glassy polymers. In this paper, an optical technique is presented to quantify the crazing dominated creep damage that occurs on a stressed transparent glassy polymeric sheet of polymethyl methacrylate (PMMA).
Crazing of polymers
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WebMay 27, 2024 · Can annealing induce crazing in a pre-drawn glassy polymer? According to our explanation, crazing as a localized breakdown of the chain network is due to chain pullout upon the force imbalance. Thus, a sufficiently cold-drawn polymer can … WebDec 2, 2012 · Download Solvent Crazing of Polymers Book in PDF, Epub and Kindle. The problems related to crazing in polymers are of special interest to polymer scientists since only polymers display this universal phenomenon and no analogues are available for low-molecular-mass compounds. The important problems of solvent crazing and the …
WebCrazing is the phenomenon that produces a network of fine cracks on the surface of a material, for example in a glaze layer. Crazing frequently precedes fracture in some glassy thermoplastic polymers. As it only … WebMay 15, 2024 · The scale of crazing ranges from tens of nanometers to microns. When the stress threshold, which is the ultimate stress that the polymer can bear, that is, the stress at which damage begins to appear is reached, the polymer starts to craze. With the increase of stress, the number of crazes increase and can even cover the whole plane (Fig. 1 ...
WebCrazing Deformation: Many polymers display another type of localized yielding behavior which results in whitening of the polymer in the region of maximum deformation. Under a microscope, these localized regions of yielding display an increase in volume (dilatation) through formation of micro-cracks which are bridged by polymer fibrils. ... WebCrazing is a common phenomenon in the fracture process of polymeric materials, so that crazing and fracture are interlocked when one is dealing with failures of polymers. Figure 9 shows a sketch of a surface craze that has formed under a tensile stress.
WebDec 2, 2012 · Download Solvent Crazing of Polymers Book in PDF, Epub and Kindle. The problems related to crazing in polymers are of special interest to polymer scientists since only polymers display this universal phenomenon and no analogues are available for …
WebCrazing in polymers always competes with yielding. Below the brittle-ductile transition temperature, polymers fail via crazing, wheras above this temperature yielding dominates. The brittle-ductile transition temperature itself depends on the morphology of the … southold township rental permitWebApr 5, 2013 · It is shown that polymer crazing in AAMs is a complex multistage process. Its first stage is initiation of crazes related to the microscopic surface defect structure of the actual polymer and is ... southold tractorsWebJul 15, 2004 · Abstract. The present article discusses yield and crazing in polymeric materials. After introducing the definitions of stress and strain states, we present a brief summary of the general stress–strain responses for polymers under uniaxial tensile and compressive loading. We introduce the various regimes of behavior, from almost linear … teaching vowelsWebDec 2, 2012 · The problems related to crazing in polymers are of special interest to polymer scientists since only polymers display this universal phenomenon and no analogues are available for low-molecular-mass compounds. The important problems of … teaching vowel teams videoWebYield-Craze Behavior of Amorphous Polymers Molecular Criterion for Failure Mode. Many fractures of plastics are caused by cavitation and crazing or by yielding. Which mechanism dominates depends on the properties of the plastic and on the test conditions. southold transfer stationWebMar 5, 2013 · The Physics of Deformation and Fracture of Polymers - March 2013 Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our websites. teaching vs coaching differenceWebCrazing in Polymers Home. Conference proceedings. Crazing in Polymers Editors: H. H. Kausch; H. H. Kausch. View editor publications. You can also search for this editor in PubMed Google Scholar. Part of … teaching vowel sounds to older students