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Method of predicting residual life of brittle creep fracture in molding component

A technique for creep failure and life prediction, used in the application of stable tension/pressure to test the strength of materials, material analysis using radiation diffraction, etc.

Inactive Publication Date: 2012-07-25
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to directly apply this method to organic polymer materials

Method used

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  • Method of predicting residual life of brittle creep fracture in molding component
  • Method of predicting residual life of brittle creep fracture in molding component
  • Method of predicting residual life of brittle creep fracture in molding component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) A polyacetal resin (Duracon M90 manufactured by Polyplastics Co., Ltd.) was molded into an ISO dumbbell-shaped tensile test piece having a thickness of 4 mm by injection molding. The creep rupture life of the test piece was measured at a temperature of 80° C. at a temperature of 80° C. under various loads using a tensile creep tester manufactured by Toyo Seiki Co., Ltd. with a constant temperature bath. Combine the results in the figure 1 . In the region where the load is less than 22MPa, the slope changes, which is the brittle creep region. inserted by figure 1 The standard curve of can predict the creep failure life under a specific load magnitude. The creep rupture life when the magnitude of the load is 13MPa, 14MPa, 15MPa, and 16MPa is the value shown in Table 1.

[0063] (2) In the above-mentioned creep testing machine, a constant load of 13 MPa, 14 MPa, 15 MPa, and 16 MPa was applied to the above-mentioned test piece at a temperature of 80°C. The test p...

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Abstract

The present invention provides a method for predicting the remaining lifetime of brittle creep rupture of forming component. The method of the invention is simple and effectively predicts the remaining lifetime of brittle creep rupture of forming component which is made of organic polymer material. Specifically, when the remaining lifetime of brittle creep rupture of forming component made of organic polymer material is predicted, the remaining lifetime is predicted by the existence amount of micropores of target sample through pre-calculating the relationship of micropore amount, which is measured by small-angle X-ray diffraction method.

Description

technical field [0001] The present invention relates to a method for predicting the remaining life to brittle creep failure of shaped parts made of organic polymeric materials. Background technique [0002] Organic polymer materials are used in various applications after being shaped and processed by various devices and methods, and the test piece is subjected to a certain amount of load, exposed to a specific temperature or atmosphere, and actually measured until the test piece breaks time to estimate the creep failure life of these formed parts. The creep failure life is greatly affected by the environmental conditions, so in order to estimate the failure life with good accuracy, the same test is generally repeated under the environmental conditions suitable for the use environment, and an attempt has also been made to unify The relationship between load and creep failure life at different temperatures is sorted out in detail. [0003] However, it is difficult to predict...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N23/20
Inventor 村尾俊郎大井和树
Owner POLYPLASTICS CO LTD