THE INFLUENCE OF MICROSTRUCTURE ON FATIGUE CRACK-PROPAGATION IN POLYOXYMETHYLENE

被引：21

作者：

RUNT, J

GALLAGHER, KP

机构：

[1] Polymer Science Program, Department of Materials Science and Engineering, The Pennsylvania State University, Pennsylvania

来源：

JOURNAL OF MATERIALS SCIENCE | 1991年 / 26卷 / 03期

关键词：

D O I：

10.1007/BF00588317

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An analysis of the influence of crystalline microstructure on fatigue crack propagation in polyoxymethylene is presented. A series of test specimens containing a variety of diverse microstructures was prepared through controlled thermal treatments of plaques from four different lots of polyoxymethylene. Extensive characterization of the crystalline microstructure was carried out in order to permit a direct comparison between the fatigue behaviour and crystalline microstructure. The degree of crystallinity and tie molecule density were both found to have a significant affect on fatigue crack propagation rate while average spherulite size did not appear to influence fatigue behaviour. Additionally, the fatigue fracture surfaces of many of the test specimens were examined. Three distinct surface topographies were observed and found to correlate with different stages of crack growth. In the region near the end of fatigue crack propagation, closely spaced surface markings that resemble fatigue striations were observed.

引用

页码：792 / 798

页数：7

共 19 条

[1] MORPHOLOGY AND MECHANICAL-PROPERTIES IN SEMICRYSTALLINE POLYMERS [J].

ANDREWS, EH .

PURE AND APPLIED CHEMISTRY, 1974, 39 (1-2) :179-194

[2]

ANDREWS EH, 1970, P R SOC LOND A, V325, P57

[3]

Broek D., 1986, ELEMENTARY ENG FRACT

[4]

BROWN N, 1983, J MATER SCI, V38, P1405

[5] MECHANICAL-PROPERTIES OF MODEL POLYETHYLENES - TENSILE ELASTIC-MODULUS AND YIELD STRESS [J].

CRIST, B ;

FISHER, CJ ;

HOWARD, PR .

MACROMOLECULES, 1989, 22 (04) :1709-1718

[6]

FRIEDRICH K, 1979, 9TH P C SCANN EL MIC, P173

[7]

Hertzberg R. W., 1980, FATIGUE ENG PLASTICS

[8] FATIGUE CRACK-PROPAGATION IN POLYACETAL [J].

HERTZBERG, RW ;

SKIBO, MD ;

MANSON, JA .

JOURNAL OF MATERIALS SCIENCE, 1978, 13 (05) :1038-1044

[9]

Hoffman J.D., 1975, TREATISE SOLID STATE, V3

[10]

KELLY A, 1973, STRONG SOLIDS, P10

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