き裂開口変位分布に基づくき裂開口応力分布と応力拡大係数の評価法

概要

論文の詳細を見る
In linear fracture mechanics, stress intensity factors controlling the fracture behavior of materials are calculated from stress distributions acting on the crack surfaces by the aid of superposition even for remote applied stresses. These stress distributions, however, cannot be measured directly in a state of crack opening because of the stress relief, which is seen in tensile residual stress fields for instance. In this report, such stress distributions are assessed by measuring the opening displacements along a crack under tensile loading, using the equation that was derived based on the complex-valued formulas on the stress and displacement of a two-dimensional crack. The known analytical opening displacements for cracks whose surfaces are subjected to a given stress distribution are used for numerically checking the validity of the equation. It was found that this method was available to the estimation of the stress intensity factors of central-cracks as opened by axial tensile loading, using rectangular specimens.
社団法人日本機械学会の論文
1989-07-25