著者

菊池 正紀 矢野 一範 田村 敏功

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:03875008)

巻号頁・発行日

vol.56, no.524, pp.831-837, 1990

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Surface-cracked specimens are analyzed precisely using the three-dimensional finite element method, and the stress fields at the crack tip are compared with HRR solution. First, a plate with a surface crack subjected to a bending load is analyzed. It is shown that the stress field does not agree well with the HRR solution when the crack depth is not large. But as the crack depth increases, the stress field becomes nearer to the HRR solution. It is also shown that a displacement field similar to the HRR solution exists in a small region wheich is very near to the crack tip. Then the surface crack in a pipe is analyzed. The results show that the stress field is significantly different from the HRR solution. The reason for this difference is considered to be the difference of the stress distribution in the ligament of the specimen.

著者

手塚 建一 和田 義孝 高橋 昭如 吉田 隆弘 菊池 正紀

出版者

一般社団法人 日本機械学会

雑誌

バイオエンジニアリング講演会講演論文集 2003.15 (ISSN:24242829)

巻号頁・発行日

pp.73-74, 2003-01-20 (Released:2017-06-19)

著者

町田 賢司 菊池 正紀 澤 芳昭 Fu-Pen CHIANG

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.60, no.573, pp.1294-1299, 1994-05-25

被引用文献数

7 1

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Two-dimensional Fourier transform analysis is presented as an advanced method for numerically processing the Young's fringes diffraction pattern from a double-exposure speckle photograph. The fringe spacing and orientation are determined using only one Young's fringes pattern without any other diffraction halo patterns. This algorithm is based on the 2-D FFT of the fringe pattern with 256×256 pixels. Therefore, it has enabled automatic analysis to be performed with noisy and poor fringe patterns. The measurement of deformation field by the laser speckle method can be carried out with higher accuracy, reliability and speed.

著者

菊池 正紀 和田 義孝 高橋 真史

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A (ISSN:03875008)

巻号頁・発行日

vol.74, no.742, pp.812-818, 2008-06-25

参考文献数

15

被引用文献数

10

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Fatigue crack growth under mixed mode loading conditions is simulated using Superimposed-FEM (S-FEM). By using S-FEM technique, only local mesh should be re-meshed and it becomes easy to simulate crack growth. By combining with re-meshing technique, local mesh is re-meshed automatically, and curved crack path is modeled easily. At first, slant crack problem is solved. It is shown that results agree with conventional solutions, and verified the availability of this technique.Then two-crack problems are solved in several cases by changing each crack location. Stress intensity factors are evaluated and interaction effect between two cracks is discussed. Results are compared with crack coalescence criteria, and it is verified that these criteria are reasonable ones.