ぜい性プラスチック板材の切欠破壊強度と破面模様の関係

概要

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The fracture strength was varied by changing an inter-grip distance (which we call a gage length here) of a sharply notched tensile sheet specimen of unsaturated polyester resin, where the specimen width, thickness, rack length and loading method wee kept constant. the loading method is such that the main load works on a line parallel to the axis of loading and does not cross the crack length. We call this an outside loading. The number, density, area ratio of fracture surface markings vary with the fracture strength of the material. The total number of markings increases with the fracture strength. The density and area ratio of markings increase at each different rate with respect to fracture strength, and incipient bifurcation such as hangnails, appears at a certain value of the density or area ratio. These results are discussed with the analytical relations of the fracture strength, the dynamic stress-intensity factor and the dynamic strain-energy-release rate by employing the reported relations. The fracture surface markings are examined by the two-dimensional equation of fracture surface markings, and the analytical area ratio of the markings is also calculated.
一般社団法人日本機械学会の論文
1986-04-25