抄録
Microscopic defects such as vacuoles and crazes generated in stressed and/or strained solid material play the important and detrimental roles for strength of thermoplastic. It should be, however, noted that investigations on accumulation and residue of micro-defects under or after stressing and its effect on macroscopic strength characteristics of the material have not been sufficient, because of technical difficulties in detection and trace of behavior of such micro-defects.
In this article, the author would like to explain a Small Angle X-ray Scattering (SAXS) method for piriodical trace of micro-vacuoles in a polypropylene sheet. Variations in number as well as size of micro-defects under uniaxial loading were studied by use of Guinier theory. Also, the relationship between cumulative damage due to microdefects and macroscopic mechanical degradation was discussed standing upon the behavior of micro-defect obtained under various types of loading history.
