プラスチックねじの強度に関する研究 : 組合せ荷重下におけるプラスチックねじの挙動

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This paper deals with the experimental consideration on a method to estimate the strength of plastics screws under the combined load of tension and torsion. First, a testing machine is designed so that the three different tests (i. e. tensile, tightening and proportional loading tests) can be carried out for this purpose. Second, it is proposed that the equivalent stress-equivalent plastic strain curve obtained from combined loading should be compared with the stress-strain curve in the uniaxial tension to clarify the strength under such the combined load corresponding to the proof stress under the uniaxial tension. Third, the strength of the screws made of polycarbonate (PC) is considered by use of the testing machine. The results obtained are as follows. (1)The equivalent stress-equivalent plastic strain curves of the screws under the combined load agree approximately with the stress-strain curve of cylindrical test piece under uniaxial tension. (2)The tendencies of the stress under the combined load corresponding to the proof stress of PC screw gives fairly good agreement with the failure curve based on Maximum Distorsion Energy Theory. (3)The strength of PC screws in tightening can be predicted from the proof stress of cylindrical test piece under uniaxial tension since the shearing stress can be assumed approximately to be distributed linearly in the radial direction within the range of actual tightening.
公益社団法人精密工学会の論文
1984-02-05

プラスチックねじの強度に関する研究 : 組合せ荷重下におけるプラスチックねじの挙動

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