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高速進展き裂コウスティックのホログラフィ記録 Holographic Recording of Caustic Light Beams of Fast Propagating Cracks 鈴木, 新一 細田, 康司 SUZUKI, Shinichi HOSODA, Yasuzi Fracture Measurement Optical_Engineering Holography Caustic Dynamic_Fracture Three-Dimensional_Stress_Field Fracture Measurement Optical_Engineering Holography Caustic Dynamic_Fracture Three-Dimensional_Stress_Field A pulsed holographic technique is described which records and reconstructs caustic light beams of fast propagating cracks in polymethylmethacrylate (PMMA). A caustic light beam of a fast propagating crack is recorded as a hologram at an instant during its propagation with a pulsed holographic recording system. Illuminated with reconstruction light, the hologram reconstructs the caustic light beam, and diameters of caustics at various distances from the specimen are measured from the reconstructed caustic light beam. Values of dynamic stress intensity factor K_1 and initial curve radii are calculated from the caustic diameters. The initial curve radius at which calculated K_1 values deviate from the real K_1 value gives the scale of the three-dimensional stress field which appears around the fast propagating crack tip. In the case of cracks propagating through specimens 3mm in thickness, the 3-D stress field spreads as far as the distance of half of the specimen's thickness from the tip. ・rights：日本機械学会 ・rights：本文データは学協会の許諾に基づきCiNiiから複製したものである ・relation：isVersionOf：http://ci.nii.ac.jp/naid/110002377833/ 一般社団法人日本機械学会 1989-09-25 jpn journal article VoR https://repo.lib.tut.ac.jp/records/1233 http://ci.nii.ac.jp/naid/110002377833/ CiNii 03875008 日本機械学會論文集. A編 Transactions of the Japan Society of Mechanical Engineers. A 55 517 1974 1978 https://repo.lib.tut.ac.jp/record/1233/files/n03875008-0055-1974.pdf application/pdf 566.4 kB 2013-07-22