Keiji Ogi

Out-of-plane punching response governed by shear-dominated fiber failure in CFRP cross-ply laminates

Shinya Matsuda, Hina Moriyama, Mikio Amufukutake, Keiji Ogi

jp (code pays fourni par la source)

Octahedral fiber-composite inertial amplification metamaterials for broadband attenuation of three-dimensional vibrations

Koichi Mizukami, Shota Asayama, Keiji Ogi

• Fiber-composite inertial amplification metamaterials are proposed. • Proposed metamaterials were manufactured by assembling 3D-printed composite parts. • Partial embedding of continuous carbon fibers widens the band gap. • Band-gap width and attenuation were maximized using band-structure analysis. This paper proposes octahedral …

jp (code pays fourni par la source)

Statistical and directional dependence of through-thickness complex permittivity in interlayer-toughened unidirectional CFRP laminates

Keiji Ogi, Ryotaro Ozaki

jp (code pays fourni par la source)

3D-printed fiber-steered acoustic black hole beam for enhanced damping in low-frequency range

Koichi Mizukami, Kaishi Itashiki, Keiji Ogi

Acoustic black hole (ABH) beams are thin-walled tapered structures that mitigate resonance peaks above the cut-on frequency. An ABH beam with circular carbon-fiber paths in the wedge is proposed to overcome the trade-off between the low cut-on frequency and high specific stiffness …

jp (code pays fourni par la source)

Effect of specimen surface area on through-thickness electrical conductivity in unidirectional CFRP laminates with interlayers

Keiji Ogi, Ryotaro Ozaki, Koichi Mizukami

jp (code pays fourni par la source)

Prediction of viscoelastic effective creep compliances in cracked cross-ply composite laminates

Keiji Ogi, Shuji Yoshikawa, Tomonaga Okabe, Sota Onodera

jp, ru (code pays fourni par la source)

Detection of Delamination in a CFRP Laminate during Drilling by Electrical Impedance Method

Keiji Ogi, Ryosei TAKANO, Mitsuyoshi TSUTSUMI, Koichi Mizukami

In this study, we attempted in-situ push-out delamination (POD) detection during drilling using an electrical impedance method. We measured changes in electrical impedance and the internal strain around a drilled hole to detect the onset of POD, and estimated the critical thrust …

jp (code pays fourni par la source)

Fiber-steered acoustic black hole beam with low cut-on frequency and high stiffness

Koichi Mizukami, Musashi Shiratori, Keiji Ogi

jp (code pays fourni par la source)

Viscoelastic Continuum Damage Mechanics Model of a Composite Laminate with Constant Matrix Crack Density

Keiji Ogi, Shuji Yoshikawa, Tomonaga Okabe, Sota Onodera

jp (code pays fourni par la source)

Creep and stress relaxation behavior of cracked CFRP cross-ply laminates

Keiji Ogi

Predicting the long-term deformation behavior of CFRP laminates is important from the viewpoint of structural durability. In this paper, the behaviors of deformation and crack opening displacement (COD) of cracked CFRP laminates under creep loading or stress relaxation were investigated numerically and …

jp (code pays fourni par la source)

Analytical modeling and 3D printing of locally resonant composite sandwich metamaterials with inertial amplification mechanisms

Koichi Mizukami, Kentaro Abe, Takehito Senga, Keiji Ogi

jp (code pays fourni par la source)

Open-Hole Compressive Strength and Fracture Morphologies of Punched and Drilled CFRP Laminates

S. Matsuda, H. Muramatsu, Shigeki Yashiro, Keiji Ogi

Piercing is an essential process for composite structures because they are usually near-net-shape manufactured to reduce further machining operations. Although drilling is commonly used to increase productivity, punching by out-of-plane shear loading is also used. This study analyzes the open-hole compressive (OHC) …

jp (code pays fourni par la source)