Detail publikačního výsledku

Residual stress distribution in extruded polypropylene pipes

PODUŠKA, J.; KUČERA, J.; HUTAŘ, P.; ŠEVČÍK, M.; KŘIVÁNEK, J.; SADÍLEK, J.; NÁHLÍK, L.

Originální název

Residual stress distribution in extruded polypropylene pipes

Anglický název

Residual stress distribution in extruded polypropylene pipes

Druh

Článek WoS

Originální abstrakt

This paper deals with the experimental determination of residual stress and other inherent properties, density, yield stress, specific enthalpy of fusion and melting point temperature, of a polypropylene grade for pipe applications. The most important of these characteristics is the residual hoop (circumferential) stress, because it has a considerable effect on pipe lifetime. The experimental procedure for obtaining the residual hoop stress distribution by measuring the deflection of axially slit ring specimens is described and the data are evaluated by two approaches – a method based on theory of a curved beam and an older method based on theory of a thick-walled cylinder. Numerical modelling by FEM is employed to simulate the behavior of the ring specimens. The experiment was carried out on a set of 8 polypropylene pipes of different dimensions. The results for these pipes are compared, and a general equation describing the residual hoop stress distribution independently of pipe dimensions is proposed. Also, the influence of axial residual stress on the hoop residual stress is studied and, with the help of FEM, a correction of the results for long pipes is derived.

Anglický abstrakt

This paper deals with the experimental determination of residual stress and other inherent properties, density, yield stress, specific enthalpy of fusion and melting point temperature, of a polypropylene grade for pipe applications. The most important of these characteristics is the residual hoop (circumferential) stress, because it has a considerable effect on pipe lifetime. The experimental procedure for obtaining the residual hoop stress distribution by measuring the deflection of axially slit ring specimens is described and the data are evaluated by two approaches – a method based on theory of a curved beam and an older method based on theory of a thick-walled cylinder. Numerical modelling by FEM is employed to simulate the behavior of the ring specimens. The experiment was carried out on a set of 8 polypropylene pipes of different dimensions. The results for these pipes are compared, and a general equation describing the residual hoop stress distribution independently of pipe dimensions is proposed. Also, the influence of axial residual stress on the hoop residual stress is studied and, with the help of FEM, a correction of the results for long pipes is derived.

Klíčová slova

polypropylene, extruded polymer pipe, residual stress, curved beam methodology, numerical simulations

Klíčová slova v angličtině

polypropylene, extruded polymer pipe, residual stress, curved beam methodology, numerical simulations

Autoři

PODUŠKA, J.; KUČERA, J.; HUTAŘ, P.; ŠEVČÍK, M.; KŘIVÁNEK, J.; SADÍLEK, J.; NÁHLÍK, L.

Rok RIV

2015

Vydáno

01.12.2014

Nakladatel

Elsevier

ISSN

0142-9418

Periodikum

POLYMER TESTING

Svazek

2014

Číslo

40

Stát

Spojené království Velké Británie a Severního Irska

Strany od

88

Strany do

98

Strany počet

11

BibTex

@article{BUT109901,
  author="Jan {Poduška} and Jaroslav {Kučera} and Pavel {Hutař} and Martin {Ševčík} and Josef {Křivánek} and Jiří {Sadílek} and Luboš {Náhlík}",
  title="Residual stress distribution in extruded polypropylene pipes",
  journal="POLYMER TESTING",
  year="2014",
  volume="2014",
  number="40",
  pages="88--98",
  doi="10.1016/j.polymertesting.2014.08.006",
  issn="0142-9418"
}