On the Creep Tests of Unplasticized Polyvinyl Chloride

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  • 硬質塩化ビニルのクリープ試験
  • コウシツ エンカビニル ノ クリープ シケン

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Tensile creep tests of unplasticized polyvinyl chloride were carried out under constant load. Test pieces used in these tests were cut from the sheet of 1mm thickness.<br>We see that the following expression may be applicable in primary period of creep obtained from these tests, <br>ε=mtn<br>where ε is creep strain, t is time duration for loading, and m, n are constants. Both these constants vary their values subjecting to applied stresses and testing temperatures.<br>Next, creep in secondary period may be shown nearly as a straight line with tendency slightly concave upwards in the strain-time diagram as it may be regarded to be in the steady state.<br>Relation between minimum creep rate εmin, which is considered to be characteristics in secondary period, and conventional tensile stress σ at a constant temperatures is expressed by<br>εmin=c exp.(aσ), <br>where c and a are constants.<br>Minimum creep rates under constant stress at various absolute temperatures T are expressed by<br>εmin=A exp.(-B/RT), <br>where A and B are constants and R is gas constant.<br>The specimens kept at 60°C for 5 days show themselves to have smaller values of minimum creep rates than the normal, and become more brittle and considerably anisotropic.

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