Akio Yonezu
Chuo University
Ultimate tensile strengthFinite element methodDeformation (engineering)Composite materialAcoustic emissionThin filmMetallurgyMaterials scienceDeformation (meteorology)Nano-IndentationCoatingFracture (geology)PolymerCrackingMolecular dynamicsDelaminationPlasticityAnisotropyStress (mechanics)Fracture toughness
195Publications
15H-index
752Citations
Publications 188
Newest
#1Kohei Kanamori (Chu-Dai: Chuo University)H-Index: 2
#2Yoshikatsu Kimoto (Chu-Dai: Chuo University)H-Index: 1
Last. Akio Yonezu (Chu-Dai: Chuo University)H-Index: 15
view all 4 authors...
Abstract Direct bonding of metals with resin plays a critical role in the jointing of dissimilar materials. The adhesion strength is known to be dependent on strain (loading) rate due to the strain rate sensitivity of polymeric resin. This study evaluated the adhesion durability of an epoxy resin adhesive on an aluminum alloy under cyclic impact loading. First, we used a repetitive laser shock adhesion test (LaSAT), which enabled us to evaluate the impact strength of interfacial fractures (i.e.,...
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#1Yasuhisa Kodaira (Chu-Dai: Chuo University)
#2Tatsuma Miura (Chu-Dai: Chuo University)H-Index: 2
Last. Hideki Nagatsuka (Chu-Dai: Chuo University)H-Index: 5
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Abstract This study experimentally and numerically investigated the crack propagation behavior of porous polymer membranes in order to identify the criterion for crack propagation. A notch was introduced into the membrane as an initial crack (pre-crack), and a uniaxial loading was applied to produce stable crack propagation. During the test, crack propagation was observed using a CCD camera and the digital image correlation (DIC) method. The strain around the pre-crack tip at the onset of crack ...
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#1Kohei KanamoriH-Index: 2
#2Shuto ToriumiH-Index: 1
Last. Akio YonezuH-Index: 15
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We evaluated the adhesion of polycrystalline metallic coatings using the laser shock-wave adhesion test (LaSAT). This study used Cu plating on stainless steel as a coating model. The adhesion strength and toughness were successfully estimated using LaSAT and finite element method with cohesive zone model. Next, repeated LaSAT was conducted to apply cyclic loading to evaluate adhesion fatigue life, i.e., the number of loading cycles required for delamination. Furthermore, this study performed mol...
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#1Fumika Nishimori (Chu-Dai: Chuo University)H-Index: 1
#2Daiki Ikeshima (Chu-Dai: Chuo University)H-Index: 3
Last. Akio Yonezu (Chu-Dai: Chuo University)H-Index: 15
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Abstract In this study, we have proposed an indentation method to characterize a surface degraded layer due to UV light irradiation of polymers. Here, we assume that the degraded layer has a homogeneous and isotropic nature, and that the target material is a bilayer system (i.e., the degraded layer is formed on the substrate of the non-degraded base material). This method enables the quantitative measurement of mechanical properties (Young’s modulus E and yield strength σY) and thickness of the ...
1 CitationsSource
#1Kohei Kanamori (Chu-Dai: Chuo University)H-Index: 2
#2Yusaku Saito (Chu-Dai: Chuo University)H-Index: 1
Last. Xi Chen (Northwest University (United States))H-Index: 121
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This study aims to evaluate coating adhesion durability using the laser shock-wave adhesion test (LaSAT). In particular, the interfacial strength with respect to the applied loading cycle is evaluated quantitatively. This method uses strong elastic waves induced by pulsed laser irradiation, as interfacial fracture of the coating occurs due to a strong wave. The coating delamination can be identified from changes in the out-of-plane displacement waveform, yielding a critical laser energy for coat...
1 CitationsSource
#1Kohei Kanamori (Chu-Dai: Chuo University)H-Index: 2
#2Yoshikatsu Kimoto (Chu-Dai: Chuo University)H-Index: 1
Last. Akio Yonezu (Chu-Dai: Chuo University)H-Index: 15
view all 3 authors...
Source
#1Yasuhisa Kodaira (Chu-Dai: Chuo University)
#2Tatsuma Miura (Chu-Dai: Chuo University)H-Index: 2
Last. Hideki Nagatsuka (Chu-Dai: Chuo University)H-Index: 5
view all 5 authors...
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#1Kanako Emori (Chu-Dai: Chuo University)H-Index: 1
#2Tatsuma Miura (Chu-Dai: Chuo University)H-Index: 2
Last. Akio Yonezu (Chu-Dai: Chuo University)H-Index: 15
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Abstract This study systematically investigates the indentation deformation behavior of polytetrafluoroethylene (PTFE) membranes used for water purification. The examined PTFE membrane has micron-sized pores with an open cell structure. The pore structure is anisotropic in shape owing to its fabrication via the stretching method. A uniaxial tension demonstrates the membranes undergo elastic and plastic deformation with significant anisotropy (as the deformation behavior differed between the long...
3 CitationsSource
#1Kohei Kanamori (Chu-Dai: Chuo University)H-Index: 2
#2Yoshikatsu Kimoto (Chu-Dai: Chuo University)H-Index: 1
Last. Akio Yonezu (Chu-Dai: Chuo University)H-Index: 15
view all 4 authors...
Abstract This study aims to evaluate the adhesion strength and durability of Ni P coatings in a non-contact manner using the Laser Shock Adhesion Test (LaSAT). A hard coating of electroless Ni P deposited on carbon steel substrate (SKD11) was prepared, and the effect of post heat treatment on adhesion was comprehensively investigated in this study. With the LaSAT, strong elastic waves induced by pulsed YAG laser irradiation applies tensile stress to the coating/substrate interface resulted in in...
4 CitationsSource
#1Xiaoyang Shi (Center for Advanced Materials)H-Index: 14
#2Hang Xiao (Center for Advanced Materials)H-Index: 71
Last. Xi Chen (Center for Advanced Materials)H-Index: 121
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Summary An energy-saving system containing ion-exchange or nanoporous materials and carbonate ions is proposed, which is capable of capturing CO2 from ambient air simply by controlling the amount of water (moisture) in contact with the sorbent. The system binds CO2 from the air when the surrounding is dry, whereas it desorbs CO2 when it is wet. A design of such CO2 sorption and desorption systems is investigated using quantum mechanics simulations and is verified by experiments. Its working mech...
7 CitationsSource