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Volume 32 (2006)
- Issue 6 Pages 231-
- Issue 5 Pages 193-
- Issue 4 Pages 147-
- Issue 3 Pages 99-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 32, Issue 5
Displaying 1-5 of 5 articles from this issue
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Akihiko KITANO, Koji YAMAGUCHI2006 Volume 32 Issue 5 Pages 193-197
Published: September 15, 2006
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (4241K) -
Akinori YOSHIMURA, Shigeki YASHIRO, Tomonaga OKABE, Nobuo TAKEDA2006 Volume 32 Issue 5 Pages 198-207
Published: September 15, 2006
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThis study investigated the tensile damage progress in stitched laminates experimentally and numerically. Particularly, the effects of stitching on the damage progress was focused. First, it was experimentally confirmed that ply cracks and delamination appeared under loading regardless of the stitching. We then performed damage extension simulation for stitched laminate using a layer. wise finite element model with beam elements as stitch threads, in which the damage (ply cracks and delamination) was represented by cohesive elements. The detailed comparison between the observa-tion and the simulated results confirmed that stitching has few effects on the onset and the accumula-tion of the ply cracks. Furthermore, we demonstrated that the stitch threads significantly suppresses the extension of the delamination.View full abstractDownload PDF (12850K) -
Shigeki YASHIRO, Kazue MURAI, Tomonaga OKABE, Nobuo TAKEDA2006 Volume 32 Issue 5 Pages 208-217
Published: September 15, 2006
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThis study proposes two new approaches for estimating the damage patterns in a holed CFRP cross-ply laminate using an embedded fiber Bragg grating (FBG) sensor. It was experimentally confirmed that the reflection spectrum from the embedded FBG sensor drastically changed as the damage near the hole, i.e. splits, transverse cracks and delamination, extended. The damage patterns were predicted using forward analysis (a damage analysis and an optical analysis) with strain estimation and the proposed damage-identification method as well as the forward analysis only. The forward analysis with the strain estimation then to be yielding the best prediction from the viewpoint of the accuracy in estimating the damage pattern and the computational efficiency. Furthermore, the proposed damage identification achieved a significant reduction in the computational time and the equivalent accuracy compared to the conventional identification procedure, adopting the damage pattern obtained by the damage analysis as the initial estimation.View full abstractDownload PDF (8575K) -
Tetsuo TAKAYAMA, Mitsugu TODO, Kazuo ARAKAWA, Hideto TSUJI2006 Volume 32 Issue 5 Pages 218-225
Published: September 15, 2006
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSPhase morphology of blends of biodegradable polymers, PLA and PCL, was controlled by introducing an additive, LTI, to improve the mechanical properties of the mixture. Fracture properties such as the J-integral at initiation Jin, and the total fracture energy Jf, of PLA/PCL blends with different LTI contents were evaluated, and were compared to assess the effect of LTI content on these properties. Both Jin and Jf values were dramatically improved by LTI addition. Fracture surfaces were also examined using SEM to characterize the effect of LTI addition on the fracture mechanism. It was confirmed that the size of PCL spherulites became smaller due to the activation of LTI as a surface-active agent. As a result, void formation was inhibited, and plastic deformation to be larger, resulting the improvement of fracture properties.View full abstractDownload PDF (8890K) -
[in Japanese]2006 Volume 32 Issue 5 Pages 228
Published: September 15, 2006
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (133K)
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