scholarly journals Large strain, high rate semi-solid deformation of high density polyethylene at elevated temperatures

2017 ◽  
Vol 58 (9) ◽  
pp. 1516-1522 ◽  
Author(s):  
D. McKelvey ◽  
G.H. Menary ◽  
P.J. Martin ◽  
S. Yan
Keyword(s):  
High Density Polyethylene ◽  
Elevated Temperatures ◽  
Large Strain ◽  
High Density ◽  
High Rate ◽  
Solid Deformation ◽  
Semi Solid

Electrical and dielectric sensitivities to thermal processes in carbon nanofiber/high-density polyethylene composites

2011 ◽  
Vol 18 (1-2) ◽  
pp. 51-60 ◽  
Author(s):  
Tian Liu ◽  
Weston Wood ◽  
Bin Li ◽  
Brooks Lively ◽  
Wei-Hong Zhong
Keyword(s):  
Dielectric Properties ◽  
Thermal Treatment ◽  
High Density Polyethylene ◽  
Ac Conductivity ◽  
Elevated Temperatures ◽  
Carbon Nanofiber ◽  
Polymeric Materials ◽  
High Density ◽  
Heating Process ◽  
Thermal Processes

AbstractOwing to the huge interface region existing in a polymer nanocomposite, the effects of thermal processes on properties of nanocomposites are much more complicated than in a pure polymer. It is therefore important to determine the effects of thermal processes on nanocomposites with different interfacial interactions between the nanofillers and the polymer matrix. It is also important to explore the performance changes for nanocomposites under elevated temperatures over pure polymers. In this investigation, we examined the correlation of thermal treatment with dielectric properties of carbon nanofiber (CNF) reinforced high-density polyethylene nanocomposites. The thermal treatment of specimens was conducted for up to 120 h at 87°C and 127°C. Then, alternating current (AC) conductivity and dielectric properties were tested after definite intervals of time. Their changing rates over treatment time were analyzed. The results revealed the approximate linear relationships of AC conductivity and dielectric constant vs. heating time. Modified CNF reinforced nanocomposites had less influence by the heating treatments exhibiting better thermal resistance. The change rates of AC conductivity σ and dielectric properties have higher sensitivity to the treatment at a higher temperature. This study provides potential for further research on application of electrical and dielectric signals to detect the effects of heating process on lifetime of polymeric materials.

Theory and Practice of Meniscal Knee Replacement: Designing against Wear

1996 ◽  
Vol 210 (3) ◽  
pp. 217-222 ◽  
Author(s):  
J J O'Connor ◽  
J W Goodfellow
Keyword(s):  
Anterior Cruciate Ligament ◽  
Knee Replacement ◽  
High Density Polyethylene ◽  
Cruciate Ligament ◽  
High Density ◽  
Theory And Practice ◽  
High Rate ◽  
Knee Prostheses ◽  
Articular Surfaces ◽  
Anterior Cruciate

This paper attributes the high rate of high-density polyethylene (HDP) wear in many knee prostheses to incongruity of their articular surfaces. The authors discuss the anatomical and kinematic features of the knee which have led most designers to choose incongruous surfaces and review the reasons for employing free bearings, analogues of the natural menisci, to provide congruity without restriction of movement. There are theoretical reasons against employing freely mobile bearings in the absence of a functioning anterior cruciate ligament (ACL) and the authors' experience has confirmed this limitation in practice. It is concluded that, in bicompartmental replacement, the movements of the meniscal bearing should be limited in the anteroposterior direction. For unicompartmental arthritis, an unconstrained bearing can be employed if, as is usually the case, all ligaments are intact.

Simulation of large strain plastic deformation and texture evolution in high density polyethylene

Polymer ◽  
1993 ◽  
Vol 34 (17) ◽  
pp. 3555-3575 ◽  
Author(s):  
B.J Lee ◽  
A.S Argon ◽  
D.M Parks ◽  
S Ahzi ◽  
Z Bartczak
Keyword(s):  
Plastic Deformation ◽  
High Density Polyethylene ◽  
Large Strain ◽  
Texture Evolution ◽  
High Density

A Study of Friction Stir Welding of High Density Polyethylene

2018 ◽  
Author(s):  
Jamal Sheikh-Ahmad ◽  
Dima Ali ◽  
Firas Jarrar ◽  
Suleyman Deveci
Keyword(s):  
Friction Stir Welding ◽  
High Density Polyethylene ◽  
Elevated Temperatures ◽  
Welding Process ◽  
High Density ◽  
Weld Quality ◽  
Welding Zone ◽  
Friction Stir ◽  
Welding Processes ◽  
Material Temperature

Friction stir welding of high density polyethylene sheets was performed at different rotational and welding speeds and the material temperature close to the welding zone was monitored by infrared thermography and thermocouple measurements. Welding quality was evaluated by macrostructure analysis and tensile testing. Fracture surfaces of the tensile specimens were also analyzed. It was found that weld quality is highly dependent on the temperature of the material in the welding zone. For some specific welding conditions the welding process was unstable due to elevated temperatures reaching the melting point of HDPE. Instability of the welding processes was characterized by cyclic material temperatures and down forces. Decreasing the welding speed and increasing the rotational speed was found to improve weld quality.

scholarly journals Large-strain time-temperature equivalence in high density polyethylene for prediction of extreme deformation and damage

2012 ◽  
Vol 26 ◽  
pp. 01057 ◽  
Author(s):  
J. Furmanski ◽  
E.N. Brown ◽  
B. Clements ◽  
C.M. Cady ◽  
G.T. Gray
Keyword(s):  
High Density Polyethylene ◽  
Large Strain ◽  
High Density
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