動的破壊靱性値の新しい計測法 : パルスホログラフィ顕微鏡法を用いた高速進展き裂のCOD計測

概要

論文の詳細を見る
Pulsed holographic microscopy is applied to take an instantaneous microscopic photograph of the neighborhood of a crack tip propagating in a PMMA plate specimen at a speed of several hundred meters per second. From the photograph, crack opening displacements (COD) are measured in the vicinity of the crack tip, and the dynamic fracture toughness K_<ID> is calculated through the formula of COD in the singular stress field of a propagating crack. Two types of optical systems are used for holographic recording of cracks. The values of K_<ID> obtained through one optical system are in agreement with those obtained through the other. One of the holographic optical systems can simultaneously record the caustic of a fast propagating crack at a moment when the crack tip is recorded as a hologram. The value of K_<ID> caluculated from COD measurement is roughly in agreement with that from the caustic method.
一般社団法人日本機械学会の論文
1988-04-25