scholarly journals Constitutive Equation for Plastic Behavior of Hydrostatic Pressure Dependent Polymers.

2001 ◽  
Vol 50 (9) ◽  
pp. 968-972 ◽  
Author(s):  
Yukio SANOMURA
Keyword(s):  
Hydrostatic Pressure ◽  
Constitutive Equation ◽  
Plastic Behavior

Plastic behavior of monoclinic polypropylene under hydrostatic pressure in compressive testing

1999 ◽  
Vol 72 (10) ◽  
pp. 1241-1247 ◽  
Author(s):  
Eric Staniek ◽  
Roland Seguela ◽  
Bertrand Escaig ◽  
Philippe Fran�ois
Keyword(s):  
Hydrostatic Pressure ◽  
Plastic Behavior ◽  
Compressive Testing

245 Validity of Viscoplastic Constitutive Equation for Hydrostatic-Pressure-Dependence Polymers

2006 ◽  
Vol 2006.19 (0) ◽  
pp. 385-386
Author(s):  
Yukio SANOMURA ◽  
Mamoru Mizuno ◽  
Futoshi Nishimura ◽  
Kunio Hayakawa
Keyword(s):  
Hydrostatic Pressure ◽  
Constitutive Equation ◽  
Pressure Dependence

Study On Polyethylene-Based Carbon Fibers Obtained by Sulfonation Under Hydrostatic Pressure

2021 ◽  
Author(s):  
Jong Hyun Eun ◽  
Joon Seok Lee
Keyword(s):  
Hydrostatic Pressure ◽  
Carbon Fibers ◽  
Tensile Modulus ◽  
Melt Flow Index ◽  
Elastic Behavior ◽  
Flow Index ◽  
Plastic Behavior ◽  
Melt Flow ◽  
Oriented Polyethylene ◽  
Polyethylene Fibers

Abstract Carbon fibers were prepared using polyethylene fibers. The draw ratio of the polyethylene fibers and the sulfonation mechanism were investigated under hydrostatic pressures of 1 and 5 bar. The influence of the melt flow index of polyethylene on the sulfonation reaction was studied. Carbon fibers were prepared through the sulfonation of linear low-density polyethylene (LLDPE) fibers possessing side chains with a high melt flow index. The polyethylene fibers, which exhibited thermoplastic properties and plastic behavior, were cross-linked through the sulfonation process. Their thermal properties and mechanical properties changed to thermoset properties and elastic behavior. Although sulfonation was performed under a hydrostatic pressure of 5 bar, it was difficult to convert the highly oriented polyethylene fibers because of their high crystallinity, but partially oriented polyethylene fibers could be converted to carbon fibers. Therefore, sulfonation was performed using partially oriented LLDPE fibers with a melt flow index of 20 at 130°C for 2.5 hours under a hydrostatic pressure of 5 bar. The resulting fibers were carbonized under the following conditions: 1000°C, 5°C/min, and five minutes. Carbon fibers with a tensile strength of 2.03 GPa, a tensile modulus of 143.63 GPa, and an elongation at break of 1.42% were prepared.

Experimental Investigation of Transformation Plastic Behavior under Tensile-Compressive-Torsional Stress in Steel

2014 ◽  
Vol 626 ◽  
pp. 426-431 ◽  
Author(s):  
Naoki Hikida ◽  
Yuta Yamamoto ◽  
Kenichi Oshita ◽  
Shigeru Nagaki
Keyword(s):  
Hydrostatic Pressure ◽  
Testing System ◽  
Plastic Behavior ◽  
Test Results ◽  
Transformation Plasticity ◽  
Biaxial Testing ◽  
Torsional Strain ◽  
Pearlitic Transformation ◽  
Dependent Model ◽  
Plasticity Coefficient

A tensile/compressive-torsional biaxial testing system was employed and tensile/ compressive-torsional tests were performed for the hollow specimen, which was loaded and the austenized specimen was cooled so that pealrite transformation accompanied by transformation plasticity occurred and axial and torsional strain were measured. Furthermore, the elastic-plastic constitutive equation due to phase transformation based on the hydrostatic pressure dependent model was proposed, and the validity of this equation was discussed experimentally. The test results showed the transformation plasticity coefficient due to pearlitic transformation of S45C depends on the loading direction, and these behaviour can be appropriately expressed by the hydrostatic pressure dependent model than the isotropic model.

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