Explanipedia

Correction to: Effects of random laminate misalignment on macroscopic and microscopic elastic/viscoplastic behaviors of ultrafine plate–fin structures Open

Tetsuya MATSUDA, Kazuma Yamauchi, Nozomi Semba, Nobutada OHNO · 2021

Analysis of linear elastic properties of gel membranes constrained on a substrate Open

Hironori KAWABATA, Dai OKUMURA, Nobutada OHNO · 2019

In this study, we investigate the linear elastic properties of gel membranes constrained on a rigid substrate. To this end, the Flory–Rehner framework for polymeric gels is considered, which is extended by introducing an extended Gent mode…

Effect of cyclic hardening on stress relaxation in SUS316HTP under creep-fatigue loading at 700ºC: experiments and simulations Open

Nobutada OHNO, Tatsuya Sasaki, Takehiro Shimata, Kenji Tokuda, Kimiaki Yoshida , et al. · 2018

Cyclic hardening and stress relaxation experiments of SUS316HTP were performed under creep-fatigue loading with tensile strain holding at 700◦C. Experiments revealed that under strain holding, the slow stress-relaxation stage satisfying No…

Derivation of closed-form solution for linear elastic properties of swollen elastomers Open

Hironori KAWABATA, Dai OKUMURA, Nobutada OHNO · 2018

In this study, we derive a closed-form solution for linear elastic properties of swollen elastomers. To this end, linear perturbation analysis is applied to the Flory-Rehner theory. Instead of the Neo-Hookean solid model in the theory, the…

Creep-Fatigue Life Prediction of 316H Stainless Steel by Utilizing Non-Unified Constitutive Model Open

Takehiro Shimada, Kenji Tokuda, Kimiaki Yoshida, Nobutada OHNO, Tatsuya Sasaki · 2018

True stress and strain are necessary to estimate the rupture life under creep-fatigue conditions. Finite element analysis (FEA) is one of the most reliable method to calculate true stress and strain, but the accuracy of the obtained result…

The effect of cyclic hardening on stress relaxation behavior in creep-fatigue test of SUS 316 at 700°C Open

Tatsuya Sasaki, Nobutada OHNO, Takehiro Shimada, Kenji Tokuda, Kimiaki Yoshida , et al. · 2018

Resetting scheme for plastic strain surface in constitutive modeling of cyclic plasticity Open

Nobutada OHNO, Ryohei Yamamoto, Tatsuya Sasaki, Dai OKUMURA · 2017

A resetting scheme is proposed for correctly evaluating the plastic strain range to analyze structural components subjected to regular cyclic loading following pre‐loading. In this scheme, a plastic strain surface, referred to as the plast…

Measurement of Negative Poisson's Ratio of CFRP Laminates Using Digital Image-Based Method Open

Rikuto Oikawa, Tetsuya MATSUDA, Keita Goto, Nobutada OHNO, Shintaro MIYASITA , et al. · 2017

In this study, a through-the-thickness negative Poisson's ratio of an angle-ply carbon fiber-reinforced plastic (CFRP) laminate is experimentally investigated using a digital image-based method. For this, a novel image-based measurement me…

Cyclic plastic model of 316 stainless steel for thermo-mechanical numerical analysis Open

Hisashi Nakamoto, Yusuke Morimatsu, Nobutada OHNO, Takeshi Hamada · 2017

This paper describes the constitutive modeling of 316 stainless steel subjected to thermo-mechanical cyclic loading. To this end, thermo-mechanical and isothermal cyclic experiments with strain holding were performed at temperatures rangin…

Eigenvalue buckling analysis of domain wall defect in porous gel films Open

Akishi KASUGAI, Dai OKUMURA, Nobutada OHNO · 2017

In this paper, we perform eigenvalue buckling analysis to investigate a defect of domain walls (DWs) in a diamond plate pattern (DPP), which is caused by swelling-induced pattern transformation in porous gel films. It is found that DWs in …

Analysis of swelling-induced inhomogeneous deformation using two scaling exponents Open

Shoji Shimizu, Dai OKUMURA, Nobutada OHNO · 2016

In this study, we analyze swelling-induced inhomogeneous deformation in swollen elastomers using two scaling exponents. Two scaling exponents are introduced into the Flory-Rehner free energy function, and the values are adjusted to fit the…

Application of eigenvalue buckling analysis to swelling-induced buckling of porous gel membranes Open

Akishi KASUGAI, Dai OKUMURA, Nobutada OHNO · 2016

In this study, we perform eigenvalue buckling analysis for swelling-induced buckling of porous gel membranes. Swelling process is analyzed by increasing the chemical potential of external solvent in an inhomogeneous field theory. To invest…

Measurement of Negative Poisson's Ratios of CFRP Laminates Using Digital Images Open

Tetsuya MATSUDA, Keita Goto, Nobutada OHNO, Shintaro Miyashita, Yusuke Kawasaki , et al. · 2016

In this study, the negative through-the-thickness Poisson's ratio of an angle-ply carbon fiber-reinforced plastic (CFRP) laminate is measured based on a full-field measurement technique using digital images. For this, a [±30] angle-ply CFR…

403 Finite element analysis of wiggling buckling of microscopic patterned structure Open

Akihiro HAYASHI, Dai OKUMURA, Hiro TANAKA, Nobutada OHNO · 2016

Analysis of swelling-induced inhomogeneous deformation using an extended Flory-Rehner model Open

Shoji Shimizu, Dai OKUMURA, Nobutada OHNO · 2016

Buckling mode analysis of porous gel films using an inhomogeneous field theory Open

Akishi KASUGAI, Dai OKUMURA, Nobutada OHNO · 2016

404 Finite element analysis of "S" shaped patterns in porous gel films Open

Motoya MIZUTANI, Dai OKUMURA, Nobutada OHNO · 2016

121 A free energy function that describes swelling-induced rupture of gel materials Open

Dai OKUMURA, Akifumi Kondo, Masahiro Mizutani, Nobutada OHNO · 2016

401 Elastic-viscoplastic Implicit Integration Algorithm Applicable to Both Plane Stress and 3D Stress States Open

Hirotaka Sugiyama, Nobutada OHNO, Dai OKUMURA · 2016

402 Effect of boundary conditions in homogenization of fin-layers in tube-fin structures Open

Koki Kamakura, Nobutada OHNO, Dai OKUMURA, Keisuke IWAHORI · 2016

OS13-8 Negative Elastic-Viscoplastic Poisson's Ratio of Angle-Ply CFRP Laminates(Material design,OS13 Micro- and meso-mechanics of composites,MICRO AND NANO MECHANICS) Open

Keita Goto, Tetsuya MATSUDA, Nobutada OHNO, Yusuke Kawasaki, Shintaro Miyashita · 2015

OS0303-171 Effect of pitch-to-diameter ratio on homogeneous transformation into diamond plate patterns in gel films Open

Taiji Isomura, Dai OKUMURA, Nobutada OHNO · 2015

In this study, we investigate the effect of pitch-to-diameter ratio on homogeneous pattern transformation of gel films with a square lattice of holes. Finite element analysis is performed using an inhomogeneous filed theory of polymeric ge…

OS1320-151 Effects of two scaling exponents on mechanical properties of gels Open

Dai OKUMURA, Akifumi Kondo, Nobutada OHNO · 2015

In this study, the extended model with two scaling exponents is developed to reproduce the effects of swelling on the Young's modulus and the osmotic pressure of gels. Two scaling exponents, m and n, are introduced into strain energy funct…

OS1305-373 Negative Elastic-Viscoplastic Poisson's Ratio for Angle-Ply CFRP Laminate Open

Keita Goto, Tetsuya MATSUDA, Nobutada OHNO, Yusuke Kawasaki, Shintaro Miyashita , et al. · 2015

In this study, negative through-the-thickness Poisson's ratios of angle-ply CFRP laminates are investigated macroscopically and microscopically using a homogenization theory for time-dependent composites. For this, first, an angle-ply CFRP…

134 Finite element analysis of homogeneous pattern transformation in gel films with a square lattice of holes Open

Akira Sasaki, Dai OKUMURA, Nobutada OHNO · 2015

145 Homogenized Elastic Analysis of Tube-fin Structures in Bending Condition Open

Kohei Matsushita, Nobutada OHNO, Keisuke IWAHORI, Dai OKUMURA, Susumu MIYAKAWA · 2015

GS0708-234 Homogenization of fin-layers in tube-fin structures : Effect of boundary conditions Open

Koki Kamakura, Nobutada OHNO, Dai OKUMURA, Keisuke IWAHORI · 2015

This paper describes the homogenization of fin layers for structural analysis of heat exchanger cores composed of flat tubes and wavy fins. By considering a wavy fin sandwiched by two plates, a first-order homogenization method is proposed…

204 Effect of swelling-induced buckling and creasing on pattern transformation of porous gel films Open

Taiji Isomura, Dai OKUMURA, Nobutada OHNO · 2015

095 Effect of faceting on torsional properties of multi-walled boron nitride nanotubes Open

Yusuke Kinoshita, Atsushi MATSUBARA, Nobutada OHNO · 2015

163 Swelling-induced buckling analysis of "S" shaped patterns in porous gel films Open

Motoya MIZUTANI, Dai OKUMURA, Nobutada OHNO · 2015

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