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Saturday, August 1, 2020 | History

2 edition of An investigation of creep in irradiated polyethylene plastic found in the catalog.

An investigation of creep in irradiated polyethylene plastic

by John J. Powell

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Published by USNPGS .
Written in English

    Subjects:
  • Chemistry

  • ID Numbers
    Open LibraryOL25159571M

    R. D. Maksimov's research works with citations and 2, reads, including: The effect of partial exfoliation of multilayer silicate filler particles on the elastic properties of a polymer. An understanding of the underlying mechanisms of irradiation creep in graphite material is required to correctly interpret experimental data, explain micromechanical modeling results, and predict whole-core behavior. This project will focus on experimental microscopic data to demonstrate the mechanism of irradiation creep.

      In this study, finite element analysis was used to investigate the effect of viscoelastic behavior on round holes and longitudinal cracks in both high density polyethylene (HDPE) and polyvinylchloride (PVC) pipes. Creep of metals has been investigated by means of the endochronic constitutive equation. This is a unified approach. Transient creep tests have been conducted on stainless-steel specimens with carefully monitored precreep loading stage, either loaded at a prescribed constant strain-rate or at a constant by:

    The irradiation effects of the thermo-mechanical properties of the HDPE studied, and are shown in Figure 9. The non-irradiated sample was melted at a temperature of °C. The irradiated HDPE samples, with a small irradiation dose of 33, softens at a temperature of ° by: 8. The strain within the material due to irradiation creep occurred independently and should not be included with thermal creep and the effects of temperature/power cycling in assessing whether or not a reactor history of plastic strain had exceeded the available irradiated ductility of the material.


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An investigation of creep in irradiated polyethylene plastic by John J. Powell Download PDF EPUB FB2

Enter the password to open this PDF file: Cancel OK. File name:. AN INVESTIGATION OF THE BASIC PROPERTIES OF IRRADIATED POLYETHYLENE MEMORY MATERIALS By Preston Keusch, Donald Greer, and John Rozernbersky Distribution of this report is provided in the interest of information exchange.

Responsibility for the contents resides in the author or organization that prepared it. An investigation of creep in irradiated polyethylene plastic. By John J. Powell Get PDF (3 MB)Author: John J.

Powell. Irradiation creep is characterized by a relatively weak dependence on temperature and by a progressive increase in deformation with increasing damage level at a given temperature.

Irradiation creep was first observed in in uranium [], and in stainless steel in []. As irradiation creep involves plastic deformation, irradiation volume is conserved (i.e., expansion along the direction of applied.

The Creep of biaxially-orientated linear low-density polyethylene (LLDPE) non-crosslinked and crosslinked with β-irradiation was studied as a function of the draw ratio and irradiation dose.

According to Yeo and Hsuan (), no secondary creep (i.e., visco-plastic flow) has been observed for HDPE and PET geogrids when the strain is less than 10%.

Considering that the reinforcement. Hardness and creep of cross-linked polyethylene P. Henderson* and A. Wallace Department of Materials Technology, Brunel University, Uxbridge, Middlesex UB8 3PH, UK (Received 25 January ; accepted 23 March ) Vickers microhardness, tensile and compression tests and creep experiments have been performed at 22 on electron beam irradiated high density polyethylene (HDPE).Cited by: In the present investigation, high density polyethylene (HDPE) polymer has been used to study the alterations in its properties under gamma-irradiation.

Physico-chemical properties have been investigated with different spectroscopy techniques, Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), biocompatibility properties, as well as, mechanical properties by: 8.

A plasticity-induced damage layer develops at the polyethylene surface which results in the permanent reorientation of the crystal lamellae in the polyethylene surface []. A wide range of studies are reported in the literature on adhesive wear of polyethylene, beyond the scope of this book.

The differences between creep and wear on the polyethylene liner are shown in Fig. While a detailed discussion of polyethylene wear is beyond the scope of this book, the basic principle is that all three of these wear mechanisms are less severe with alumina femoral heads (rather than CoCr femoral heads) because alumina surfaces, although harder than CoCr, tend to be much smoother, down to.

Creep Behavior of High Density Polyethylene after Aging in Contact with Different Oil Derivates Amelia Habas-Ulloa,1 Jose-Roberto Moraes D’Almeida,1 Jean-Pierre Habas2 1 Department of Material Science and Metallurgy, Rua Marqueˆs de Sa˜o Vicente, - Ga´vea,Rio de Janeiro, RJ, BrazilCited by: The use of wood plastic composite lumber as a structural member material in marine applications is challenging due to the tendency of wood plastic composites (WPCs) to creep and absorb water.

A novel patent-pending WPC formulation that combines a thermally modified wood flour (as a cellulosic material) and a high strength styrenic copolymer (high impact polystyrene and styrene maleic anhydride Author: Murtada Abass A.

Alrubaie, Roberto A. Lopez-Anido, Douglas J. Gardner. Irradiation polymerization and synthesis provides an additive-free method of inducing polymerization and modifying already existing polymers with new properties tuned to specific applications. I continue to see an expansion in the number of fields in which heavy ion.

High Density Polyethylene (HDPE) is one of the most often used polymers in biomedical applications. The limitations of HDPE are its visco-elastic behavior, low modulus and poor bioactivity.

To improve HDPE properties, HA nanoparticles can be added to form polymer composite that can be used as alternatives to metals for bone substitutes and orthopaedic implant by: 5. The concern with hard-on-polyethylene bearings is the generation of polyethylene wear debris, which has been associated with osteolysis and aseptic loosening.

Furthermore, time-dependent degradation in the form of oxidation occurs in ultra-high-molecular-weight polyethylene (UHMWPE) and is accelerated by the gamma irradiation process generally used to sterilize by: Axial elongation, circumferential creep, ovalization and ridging in Zircaloy fuel cladding were investigated for fuel irradiated in four modern PWR's.

For fueled rods, only fluence and stress were found to influence elongation, while for nonfueled rods the texture was also important. Mechanical tests following gamma irradiation and creep tests during irradiation have been conducted on high-density polyethylene (HDPE) to provide data to help assess the adequacy of this material for use in high integrity containers (HICs).

The day creep behavior of the WPC and HDPE lumber in flexure was characterized and compared for WPC and HDPE lumber (with mm support span) subjected to three levels of creep stress: Chapter Irradiation Growth and Creep.

Introduction core structural components change dimensions due to permanent plastic deformation. These dimensional changes are caused by the processes of irradiation creep, growth and void swelling. Void swelling is discussed in Chap and creep and growth are. Extruded, oriented and UV irradiated polyethylene wire was examined using the above mentioned experimental techniques.

Five different types of high density polyethylene were included. Dramatic improvements in creep reduction was obtained by orienting the drawn polyethylene wire during the irradiation : Ronie Salerni.

The characterization of thermal ratcheting behavior of high density polyethylene (HDPE) material coupled with compressive creep is presented. The research explores the adverse influence of thermal cycling on HDPE material properties under the effect of compressive load, number of thermal cycles, creep time period, and thermal ratcheting temperature by: 3.T his article addresses one of the most important yet least understood plastics failure mechanisms, creep rupture.

Creep rupture occurs within plastic parts that are exposed to continuous stress over an extended period of time (Figure 1).Common design features that expose a plastic product to continuous stress, and thus are at risk of creep rupture, include.For the steady-state irradiation creep, the deformation may be expressed as the sum of irradiation creep and swelling and the following equation is a generalized formulation (Anderoglu et al.