ダブルトーション試験によるビトリファイド砥石のき裂進展挙動について

概要

論文の詳細を見る
The subcritical crack growth of macroscopic cracks in vitrified grinding wheels was examined using double torsion specimen. The relations between crack velocity 'υ' and stress intensity 'K' for wheels with different grain sizes were investigated. These data provided the linear correlation in plot of log υ vs. log K until sufficiently slow crack growth region. In one K-υ data, the relation was log υ=51.7 log K-18.1 Assuming that the crack velocity is still being sufficiently lower region, expected lifetime 't' at a constant stress 'σ' can be derived as t=2K^(2-n)/πaf^2(η-2)σ^2 where α and η, and f are empirically determined constants, and geometric constant, respective-ly. The lifetime vs. applied stress diagrams in which K was taken as the parameter were obtained. Fracture toughness obtained by double torsion was confirmed to show slightly higher value than by four point bending.
公益社団法人精密工学会の論文
1985-05-05