Actions for Fatigue Fracture Micromechanisms in Poly(Methyl Methacrylate) of Broad Molecular Weight Distribution

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Fatigue Fracture Micromechanisms in Poly(Methyl Methacrylate) of Broad Molecular Weight Distribution / J. Janiszewski, RW. Hertzberg, JA. Manson

Conference Author
Fracture Mechanics (1980 : Philadelphia, Pennsylvania)
Physical Description
1 online resource (22 pages) : illustrations, figures, tables
Additional Creators
Hertzberg, RW., Janiszewski, J., Manson, JA., American Society for Testing and Materials, and ASTM International
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Summary
Scanning electron microscopy was used to examine the fatigue fracture surfaces of poly(methyl methacrylate) of varying molecular weight (MW) and molecular weight distribution. The specimens had been synthesized to incorporate various porportions of high- and low-MW tails in high, medium, and low-MW matrixes. In specimens with a high-MW matrix, increased proportions of low-MW additions resulted in higher fatigue crack growth rates and a gradual shift in the appearance of the fracture surface toward that of a low-MW matrix specimen with a small addition of a high-MW specie. Crack advance was continuous, with fatigue striation widths corresponding to the macroscopically measured growth increment associated with each loading cycle. In low-MW matrixes, addition of medium- and high-MW species resulted in attenuated crack growth rates and resulting longer life. With less than 2 percent of the medium- and high-MW species, crack advance was by a discontinuous mode with each growth increment equal to the size of the plastic zone at the crack tip. At high ?K levels, discontinuous growth bands took on a scalloped appearance while maintaining a second power dependence between bandwidth and ?K.
Dates of Publication and/or Sequential Designation
Volume 1981, Issue 743 (January 1981)
Subject(s)
Other Subject(s)
ISBN
9780803148093 (e-ISBN)
9780803107328
0803107323
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 19.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1981. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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