Rapid Prediction Method of Creep Life of Polyester Industrial Yarn

Abstract

The invention relates to a rapid prediction method for the creep life of a polyester industrial yarn. The rapid prediction method comprises the following steps: carrying out standard tension testing,non-standard tension testing and creep testing on the polyester industrial yarn so as to obtain multiple groups of intensity and time data, and acquiring n fitting straight lines of the multiple groups of intensity and time data; according to an average value of straight slopes and intercepts of the n fitting straight lines, drawing a standard straight line, and rapidly predicting the creep breakage time of the polyester industrial yarn under a specific creep load according to the standard straight line, wherein standard tension testing has corresponding intensity and time of S1 and T1, the only difference between on-standard tension testing and standard tension testing is different tension velocities, non-standard tension testing has corresponding intensity and time of S2 and T2, creep testing has corresponding intensity and time of L and T3, the transverse coordinate of a coordinate system of the n fitting straight lines is the breakage time, and the longitudinal coordinate is a ratio of the intensity to S1. The rapid prediction method is good in adaptability, low in equipment requirement, simple in procedure, convenient to operate, short in time and high in popularization value.

Description

technical field [0001] The invention belongs to the field of polymer material detection, and relates to a rapid prediction method for the creep life of polyester industrial yarns, in particular to a method for predicting the creep life of polyester industrial yarns during long-term use by using short-term experimental data. Background technique [0002] As one of the varieties of high-tech fibers for industrial use, polyester industrial yarn is an important material for building a low-carbon economic culture, promoting environmentally friendly development and supporting the development of the country's high-tech industries. Polyester industrial yarn has the characteristics of high strength, high modulus and good dimensional stability, and is widely used in tire cords, safety belts, airbags and geotechnical materials. Polyester industrial yarn is made into cables or conveyor belts, etc. After long-term use, the size and shape will be unstable, resulting in material creep fail...

AI Technical Summary

Problems solved by technology

However, at present, domestic testing methods and indicators for polyester industrial yarns are limited to conventional linear density, tensile properties, thermal shrinkage, and appearance, and have not tested and evaluated indicators such as creep life during actual use.

[0003] The traditional creep life prediction method of materials is mainly the θ projection method, which extrapolates the creep curve of low stress and long time from the creep curve of high stress and short time. Although it can obtain the creep life, there are many Disadvantages, such as the dispersion of the performance of the test material itself, affect the acquisition of the material creep curve and the determination of the parameters of the fitting equation, and ultimately affect the accuracy of the measured material life

Aiming at the creep performance test of fiber materials, the patent CN 104897488 A discloses a test method for testing the static creep durability of polyester industrial yarn, which corresponds to four force values ​​of 80%, 83%, 87% and 90%. On the basis of the short-term creep rupture time, the creep load-time characteristic curve is constructed to evaluate the creep performance of polyester industrial yarn. Although it improves the accuracy of the test to a certain extent, this method requires multiple groups of products. The creep life test of the force value takes a long time, and it is impossible to quickly predict and evaluate the creep life of polyester industrial yarn samples in the actual use process

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