THE FRACTURE TOUGHNESS OF POLY(PHENYLENE ETHER KETONE) (PEK-C) AT ELEVATED TEMPERATURE

YANG Yu-ming; HE Tian-bai; YU Fu-sheng

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THE FRACTURE TOUGHNESS OF POLY(PHENYLENE ETHER KETONE) (PEK-C) AT ELEVATED TEMPERATURE

Research Article | 更新时间：2021-03-19

- THE FRACTURE TOUGHNESS OF POLY(PHENYLENE ETHER KETONE) (PEK-C) AT ELEVATED TEMPERATURE
- Acta Polymerica Sinica Issue 1, Pages: 34-40(1994)
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- Published：20 February 1994，
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YANG Yu-ming, HE Tian-bai, YU Fu-sheng. THE FRACTURE TOUGHNESS OF POLY(PHENYLENE ETHER KETONE) (PEK-C) AT ELEVATED TEMPERATURE. [J]. Acta Polymerica Sinica (1):34-40(1994)
DOI：

YANG Yu-ming, HE Tian-bai, YU Fu-sheng. THE FRACTURE TOUGHNESS OF POLY(PHENYLENE ETHER KETONE) (PEK-C) AT ELEVATED TEMPERATURE. [J]. Acta Polymerica Sinica (1):34-40(1994) DOI：

摘要

本文采用三点弯曲测平面应变断裂韧性ＪＩＣ的实验方法，研究了高温（２００℃）长时间放置过程中，聚芳醚酮的高温断裂韧性随时间的变化规律．结果表明，随放置时间的增长，断裂韧性ＪＩＣ和临界塑性屈服区尺寸△ＬＣ都逐渐减小；而屈服强度和抵抗裂纹继续扩展的阻力ｄＪ／ｄ（△ａ）皆增大，且在短时间内有较大增值．从分子运动的角度对上述各物理量的时间依赖性进行了讨论．

Abstract

The J-integral method was aPPlied to the amorphous poly (phenylene etherketone ) (PEK-C)

which is a high-Performance POlymer with Tg of 220 ℃ made inthis institutinn. The relationships between reta￣g take at temperature of 200 t withthe yield strength fracture toughness JIC critical plastic yielded zone size AL. andresistance to stable crack extension aJ/d(△a) of PEK-C were investigated. Withincreasing the retaining table at 200 t

a pronounced increases of the fold strengthand aJ/d(△a) occur within first a few hours and then only a slow asymptotic approach to equilibrium properties is observed. However the JIC and △LC decrease slowly with increasing the retaining time at 200℃. The time-dependence of yidlding and frac-ture behavior at the elevated temperature was discussed based on molecular motion.

关键词

聚芳醚酮高温断裂韧性J－积分塑性屈服区裂纹扩展阻力

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