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Volume 38 (2012)
- Issue 6 Pages 228-
- Issue 5 Pages 183-
- Issue 4 Pages 137-
- Issue 3 Pages 93-
- Issue 2 Pages 41-
- Issue 1 Pages 8-
Volume 38, Issue 4
Displaying 1-3 of 3 articles from this issue
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Research paper
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Norihiko TANIGUCHI, Yoshihiko ARAO, Tsuyoshi NISHIWAKI, Norio HIRAYAMA ...2012 Volume 38 Issue 4 Pages 137-143
Published: 2012
Released on J-STAGE: December 10, 2012
JOURNAL FREE ACCESSThe tensile properties of E-glass were determined from the experimental results of fiber bundle testing under a high strain rate. The tests were performed using two types of experimental method. One is the tension-type split Hopkinson bar system, and the other is the universal high-speed tensile-testing machine. As the results, it was demonstrated that the tensile strength and fracture strain of E-glass fiber increased with the strain rate. The absorbed strain energy, therefore, significantly increased. It was also shown that the strain rate dependency of E-glass fiber tensile-strength was strongly affected by fiber diameter. In other words, the smaller diameter of E-glass fiber has the stronger strain rate dependency. Finally, the impact tensile strengths of high-strength glass and carbon fibers were investigated. It was confirmed that the tensile strength of the high-strength glass fiber also increased with the strain rate, but the tensile properties of carbon fiber were almost independent of the strain rate.View full abstractDownload PDF (1442K) -
Masasyoshi YAMADA, Yasuhiro TANABE, Yuuta TAKEDA, Syuuji HIRATA, Narum ...2012 Volume 38 Issue 4 Pages 144-151
Published: 2012
Released on J-STAGE: December 10, 2012
JOURNAL FREE ACCESSSince aircrafts are at inevitable risks from foreign object damage (FOD) consisting of various kinds of materials, it is important to understand the effects of projectile materials on the damage behavior of CFRP. In this study, we conducted impact tests and investigated the effects of projectile materials on impact phenomena of CFRP by using three-dimensional (3D) measurement of the deformation process under high-velocity projectile impact. It was revealed that the ballistic limit range for penetration was affected by the kinetic energy of the projectile and that this kinetic energy was proportional to the diameter of the projectile in case that projectile was not deformed. When projectile was deformed, i.e., its deformation energy was not negligible small, which resulted in higher ballistic limit and small damage as compared with no deformed projectiles.View full abstractDownload PDF (1867K) -
—Relationship between Interface Size, Bonded Material Height and Intensity of Stress Singularity—Takahiko KURAHASHI, Akihiro ISHIKAWA, Hideo KOGUCHI2012 Volume 38 Issue 4 Pages 152-161
Published: 2012
Released on J-STAGE: December 10, 2012
JOURNAL FREE ACCESSWe present evaluation of intensity of stress singularity at vertex on interface of three-dimensional bonded structure based on mesh free analysis. A bonded structure consists of mild steel and aluminum is employed as computational model. Order of stress singularity is obtained by eigen analysis based on the finite element method. In this study, relationship between intensity of stress singularity, interface width of bonded structure and the height of aluminum is investigated. It is found that intensity of stress singularity for radius r direction increases with increasing interface width, for the aluminum height h and the interface width b change. In addition, it is found that if least square approximation is carried out for intensity of stress singularity K1ij and interface width b by K1θθ=ξbη, parameter η is close to the order of stress singularity λ at vertex.View full abstractDownload PDF (2866K)
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