Judgment method and prediction method for creep failure life of polymer material

A polymer material and failure life technology, applied in the field of polymer materials, can solve the problems of inability to predict the creep failure life of materials and lack of failure criteria.

Active Publication Date: 2015-02-11
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the time-stress superposition method can only predict the creep behavior of polymers under different stresses, and cannot predict the creep failure life of materials due to the lack of effective failure criteria.

Method used

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  • Judgment method and prediction method for creep failure life of polymer material
  • Judgment method and prediction method for creep failure life of polymer material
  • Judgment method and prediction method for creep failure life of polymer material

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Embodiment 1

[0065] Embodiment 1 Determination method and prediction method of creep failure life of polymer material

[0066] Polypropylene (T30s, Dushanzi Petrochemical) and polypropylene grafted maleic anhydride (grafting rate 1%, Pulaite Chemical Corp.) were used as the polymer material, and polypropylene / polypropylene was prepared by melt extrusion through a twin-screw extruder. Graft maleic anhydride blended materials, and then further prepare dumbbell-shaped specimens conforming to ASTM tensile test standards by compression molding or injection molding.

[0067] Judgment method of creep failure life:

[0068] Creep experiments were carried out on the prepared tensile samples at 40°C (the yield stress of the material at this temperature was about 40MPa) and 26, 27, 28, and 29MPa using a tensile hot-table (TST350, Linkam Scientific Instruments) (GB / T11546.1--2008 / IS0899-1:2003), to obtain the creep failure curve of polypropylene / polypropylene grafted maleic anhydride blend material,...

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Abstract

The invention relates to a judgment method and a prediction method for the creep failure life of a polymer material at a pressure lower than the yield stress of the polymer material, and belongs to the field of polymer materials. The invention provides a judgment method for the creep failure life of a polymer material, and the judgement method comprises the following specific steps: determining a creep strain-time relation of the polymer material through a creep experiment under at least three groups of different test stresses so as to obtain a corresponding creep strain-time curve; then, carrying out straight line fitting on a curve section with a slope which is constant with the increasing of time in the curve, thereby obtaining a critical point at which the polymer material has creep rupture, wherein a strain corresponding to the point is a creep failure strain of the polymer material, and the corresponding time is the creep failure life of the polymer material. The judgment method for the creep failure life of the polymer material, disclosed by the invention, is simple, intuitive and accurate.

Description

technical field [0001] The invention relates to a judging method and a predicting method of the creep failure life of a polymer material below its yield stress, and belongs to the field of polymer materials. Background technique [0002] Creep deformation occurs when polymer materials are subjected to constant stress lower than the yield strength for a long time in the working environment. Creep is a basic manifestation of the viscoelasticity of polymer materials, and it is also one of its main failure modes. The creep deformation of polymer materials will greatly reduce the working reliability, safety and service life of polymer materials. [0003] As polymers, polymer blends and composites are increasingly used as structural materials in daily life and industry, the prediction of their creep failure life becomes very necessary. However, real creep tests are usually time-consuming and cost a lot of manpower and money, which makes it impractical to directly test the creep ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/28
Inventor 黄亚江吕亚栋杨其李光宪
Owner SICHUAN UNIV
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