ポリプロピレン溶接部の低温特性に関する研究

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This paper describes an experimental study on the tensile characteristics of welded polypropylene at low temperature. The results of some measurements on the mechanical properties, fracture surfaces and X-ray diffraction patterns are reported and discussed. This study intends to clarify the low temperature characteristics of welded part comparing with those of base material, and to discuss the change in mechanical properties from room temperature down to the neighborhood of -193℃ and fracture in low temperature experiment from a microscopic point of view. Notch and load velocity effects on the brittle fracture tendency are also discussed. Testing materials were polypropylene board of 2mm in thickness, and tests were carried out at low temperature of methyl alcohol and dry ice. A heat plate welding apparatus, with which specimens could be secured under fixed contact force, was made in order to carry out the experiment of welding. The following summary can be made of the experimental results. 1) The tensile characteristics of welded polypropylene at low temperature are relatively good. 2) Tendency of low temperature characteristics of the welded part is generally similar to that of the base material. 3) Effect of load velocity is observed both on the base and the welded materials, and brittleness becomes great when the temperature is low and load velocity is high. 4) Notch effect (notch brittleness) is also observed both on the base and the welded materials at low temperature. 5) Correlation are observed between fracture surface and mechanical testing results, as well as between X-ray diffraction pattern and mechanical testing results.
社団法人溶接学会の論文
1978-03-05

ポリプロピレン溶接部の低温特性に関する研究

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