Effect of Frequency Upon Fatigue Strength of a Short Glass Fiber Reinforced Polyamide 6: A Superposition Method Based on Cyclic Creep Parameters

被引：48

作者：

Bernasconi, Andrea ^{[1
]}

Kulin, Robb M. ^{[2
]}

机构：

[1] Politecn Milan, Dipartimento Meccan, I-20133 Milan, Italy

[2] Univ Calif San Diego, La Jolla, CA 92093 USA

来源：

POLYMER COMPOSITES | 2009年 / 30卷 / 02期

关键词：

MECHANISMS; FRACTURE; POLYMERS;

D O I：

10.1002/pc.20543

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

The fatigue behavior of a conditioned short glass-fiber reinforced polyamide 6 was studied and the effect of the cyclic frequency investigated. Load controlled fatigue tests were performed, and the strains and sur face temperature of specimens were recorded continuously. The number of cycles to failure was found to be dependent upon cyclic creep rate, as is typical for short glass fiber reinforced polyamides in the conditioned state. A strong reduction of fatigue strength was observed for increasing cyclic load frequency. This was mainly related to the specimen temperature increase due to hysteretic self heating and its effect on the cyclic creep speed. A frequency superposition method is proposed, expressing the relationship between temperature rise, applied stress, and cyclic creep speed in terms of a parameter derived from the Larson-Miller steady creep parameter. POLYM. COMPOS., 30:154-161, 2009. (C) 2008 Society of Plastics Engineers

引用

页码：154 / 161

页数：8

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