Nao-Aki Noda

Nao-Aki Noda
Kyushu Institute of Technology · Department of Mechanical Engineering

Doctor of Engineering
Professor Emeritus, Kyushu Institute of Technology, 1-2-37, Kawanaka-yutaka-machi, Shimonoseki, 751-0853 Japan

About

602
Publications
77,471
Reads
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3,083
Citations
Introduction
Nao-Aki Noda and his group proposed SCF formulas for notched test specimens and received JSMS Academic Contribution Award. In METI-funded project, they studied the shrink-fitted joint structure in all ceramic rolls used under 480 degrees and clarified a new failure of comingout and received JSDE Best Paper Award and Sokeizai Industry Technology award. Regarding the studies for other joint structures they also received JCOM Award, JSTP Education Awards and JSME M&M Contribution Division Award.
Additional affiliations
April 1984 - present
Kyushu Institute of Technology
Position
  • Professor
April 1984 - January 2016
Kyushu Institute of Technology
Position
  • Professor
Education
April 1981 - September 1984
Kyushu University
Field of study
  • Mechanical Engineering
April 1979 - March 1981
Kyushu Institute of Technology
Field of study
  • Mechanical Engineering
April 1975 - March 1979
Kyushu Institute of Technology
Field of study
  • Mechanical Engineering

Publications

Publications (602)
Article
The purpose of this research is to install a handrail on sliding doors used in hospitals and nursing facilities to support the elderly and disabled to walk by themselves. Semi-automatic lifting equipment is utilised for the retractable handrail to make sure people in bad health are able to open the door using minimal force. This paper summarises er...
Article
Shrink-fitted sleeve rolls have several advantages including the ability to reuse shafts by replacing worn sleeves and the ability to apply to next-generation rolls. However, the authors’ previous simulation showed a “non-uniform slip” may appear between the shaft and the shrink-fitted sleeve even under free rolling and when no overall uniform slip...
Article
Full-text available
The rolls are classified into two types; one is a single-solid type roll, and the other is a shrink-fitted assembled type sleeve roll consisting of a sleeve and a shaft. The sleeve roll is successfully used as a large back-up roll used in rolling. However, sometimes, the interfacial slip appears although the slippage resistance torque Tr\documentcl...
Article
The aim of this paper is to explain that the ISSF evaluation method can apply when the fracture is cohesive as well as an interface fracture. The cohesive fracture usually occurs very close to the adhesive joint’s interface controlled by the intensity of singular stress field (ISSF). This is the reason why the adhesive strength can be evaluated as...
Article
Ceramics rolls/rollers recently developed can be used efficiently in steel manufacturing industries to produce high-quality steel plates under high temperature. However, sometimes the shrink-fitted shaft is coming out from the ceramic sleeve during the use even though no external force is applied in the coming out direction. In the previous studies...
Article
In hot rolling mills, bimetallic rolls are used because of the excellent hardness and wear resistance by applying high‐speed steel (HSS) and ductile casting iron (DCI). Because most of the previous studies focused on surface spalling, almost no study is available for internal fatigue failure based on the stress during the rolling. In this study, th...
Article
In hot rolling of steels, bimetallic rolls consisting of high‐speed steel and ductile casting iron are extensively used because of their excellent hardness and wear resistance although the fatigue failure study is not available. To extend the roll life service, herein, a 3D finite element method is applied to investigate the residual stress and the...
Article
In this paper, how to improve both anti-loosening and fatigue strength with low cost is newly proposed for bolt-nut connection. The authors’ previous study clarified that the most suitable pitch difference α=α1 for the fatigue strength is smaller than the most suitable pitch difference α=α2 for the anti-loosening. In this paper, toward improving bo...
Article
In this paper, the intensity of a singular stress field (ISSF) is focused and newly analyzed for a stepped-lap joint, and the adhesive strength is considered in terms of the ISSF. In this problem, it is necessary to analyze the two different singular stress fields at the interface end point A and each interface corner point Bi (i = 1,2…Ns-1, Ns = t...
Chapter
In this chapter, the finite element method (FEM) simulation is performed to study the generated stress when the rolling roll is used in the 4-high rolling mill. In order to study the effect of the residual stress, the heating treatment of the work roll is considered before the rolling process. By using the 3D model, we focus on the fatigue failure...
Chapter
Bolt nut connections are widely used in the industry. To ensure the safety of structures, both good anti-loosening performance and high fatigue are needed. In previous studies, it has been proven that by enlarging the root radii of bolt nut connections or introducing a pitch difference between the bolt and the nut, the fatigue life can be improved...
Chapter
The bimetallic work rolls are widely used in the roughing stands of hot rolling stand mills. The rolling rolls are classified into two types; one is a single-solid type, and the other is a shrink-fitted construction type consisting of a sleeve and a shaft. Regarding the shrink-fitted type, the interfacial slip occurs and causes damage between the s...
Article
In this study, tempering effect on the residual stress is studied after uniform heating–quenching and nonuniform heating–quenching for bimetallic work roll. Results for uniform heating treatment showed that the maximum stress at the center decreases by 68% from 396 MPa to 126 MPa after the first and second tempering. Results for nonuniform heating...
Article
In this study, tightening and untightening experiments were conducted for pitch difference nuts toward realizing good anti-loosening performance. By applying the three-dimensional FEM, the relationship between the tightening force F and the tightening torque T was clarified by varying the pitch difference a during the whole nut tightening/untighten...
Article
In this paper, the three-dimensional (3D) singularity index at the interface corner λcorner is newly analyzed for the prismatic butt joint in comparison with the two-dimensional (2D) singularity index along the interface edge λ2D previously studied. The finite element eigenanalysis reveals that the ratio of the singularity index is in the range of...
Article
In this study, the stress intensity factor (SIF) of an interface kinked crack is analyzed by the singular integral equation of the body force method. The problem can be expressed by distributing the body force doublets of the tension and shear types along all the boundaries of the kinked and interface crack parts. The SIFs can be obtained directly...
Article
When wood materials are used for a mechanical structure, the fatigue strength should be estimated due to repeated loads they receive. This paper reveals that the methods to calculate allowable stresses along with American Society for Testing and Materials (ASTM) and Architectural Institute of Japan (AIJ) can take the strength reduction due to fatig...
Article
Since Japanese sewer system is becoming obsolete, it is necessary to reinforce and repair the system without stopping sewer functions. In this study, a multi-layered sewer pipe plug consisting of a protective sheet and inner and outer rubber balls is focused to be installed and removed conveniently at the construction site. In this paper, a suitabl...
Article
The rolls are classified into two types; one is a single-solid type, and the other is a shrink-fitted construction type consisting of a sleeve and a shaft. The bimetallic work rolls are widely used in the roughing stands of hot rolling stand mills. Regarding a shrink-fitted construction type, the interfacial slip sometimes appears between the shaft...
Article
In this paper, the stress intensity factor (SIF) formula [Formula: see text] along the crack front of a semi-elliptical surface crack is studied. The exact SIF solution [Formula: see text] is used by solving the hypersingular integral equation of the body force method discussed in the previous paper. To obtain the accurate formula, the SIF ratio [F...
Article
In recent years, the sewer system in Japan is becoming obsolete. It is, therefore, necessary to reinforce or repair without stopping sewer functions by applying a suitable water stopping method. In this study, a multi-layered sewer pipe plug consisting of a protective sheet and inner and outer rubber balls is focused since it can be installed and r...
Article
To improve the fatigue strength of the roller chain, the fatigue test is conducted by varying the press-fitting ratio between the pin and the holed plate. To model what occurs in a chain under load, a single plate specimen is prepared by press-fitting two pins into two holes at the ends of the plate. The FEM analysis is performed to obtain the stre...
Article
Since the sewer system in Japan is becoming obsolete, it is, therefore necessary to reinforce or repair without stopping sewer functions by applying a suitable water stopping method. In this study, a multi-layered sewer pipe plug consisting of a protective sheet and inner and outer rubber balls is focused since it can be installed and removed at th...
Article
Shrink-fitted sleeve rolls have several advantages; for example, the shaft can be reused after reaching the threshold minimum diameter. However, the interfacial slip sometimes appears between the shaft and the shrink-fitted sleeve causing roll damage. To clarify the interfacial slip in real rolls, in this study, FEM analysis is performed focusing o...
Article
Shrink-fitted ceramic sleeve rollers are recently developed to be used efficiently in steel manufacturing industries. However, at times, the shaft moves out of the ceramic sleeve during cyclic loading because only small a shrink-fitting ratio can be applied. Given that the driving-out forces Fd can be calculated as the contact force occuring at the...
Article
Full-text available
The general solutions of the stress intensity factors (SIFs) for a cusp-type crack problem under remote uniform mechanical and thermal loads are presented in this work. According to the complex variable theory and the method of conformal mapping, a symmetric airfoil crack is mapped onto a unit circle, and both the temperature and stress potentials...
Article
In this study, nanobubble generator using a honeycomb structure is investigated towards producing a large amount of water including large nanobubble density. Our previous study showed that the pressure reduction and shear stress are involved in the honeycomb cell flow. In this study, the nanobubble generating performance is studied experimentally f...
Article
To evaluate fiber/matrix bonding properties, the average shear stress is generally used as the interface strength without considering the intensity of singular stress field (ISSF) at the interface ends. In this paper, therefore, how to calculate the ISSF is described in detail at the fiber entry point of the single-fiber under pull-out test. Recent...
Article
The fatigue strength improvement and anti-loosening performance are studied experimentally and analytically for JIS M16 bolt–nut connections. Three different root radii are considered coupled with three different pitch differences. The enlarging the bolt root radius improves the fatigue limit of the bolt by more than 30% because both stress amplitu...
Article
In this study, the fracture origin is identified for the prismatic butt joints whose debonding condition can be expressed as a constant value of the ISSF. The ISSF variation is newly analyzed along the interface side by considering the real specimen geometry with chamfer at the corner. The detail fractographic observation shows that most of the fra...
Book
Full-text available
This book presents selected peer-reviewed contributions from the 2020 International Conference on “Physics and Mechanics of New Materials and Their Applications”, PHENMA 2020 (26–29 March 2021, Kitakyushu, Japan), focusing on processing techniques, physics, mechanics, and applications of advanced materials. The book describes a broad spectrum of pr...
Article
Full-text available
Roller chains are commonly used to transmit mechanical power in many kinds of machineries for wide industrial fields. Roller chain manufactures are doing a lot of efforts to improve the wear resistance through conventional real chain type wear testing with huge amount of time and cost. In this study, a new wear testing machine is developed to evalu...
Article
Adhesive joints are widely used in semiconductor packaging because of their light weight, low price, and high productivity. A recent study showed that the adhesive strength can be expressed as a constant value of the intensity of the singular stress field (ISSF) appearing at the interface end. However, since adhesive structures have complex three-d...
Article
In this study, by applying three-dimensional FEM, the nut screwing process is analyzed to obtain the prevailing torque Tp confirming anti-loosening. Since the nut unscrewing properties after the nut tightening is more important to prevent the nut self-loosening, the nut unscrewing is also analyzed to obtain the residual prevailing torque Tpu newly...
Article
In our previous study, the adhesive strength of butt joints having three-dimensional (3D) geometries was investigated by using the intensity of singular stress field (ISSF) in two-dimensional modelling. In this paper, by considering the 3D geometry, the ISSF variation along the butt-joint interface side is discussed to explain the experimental resu...
Article
In a vast industrial field, the bolt-nut connection is widely used and unitized as an important machine component. In order to improve safety and for cost reduction, cheap bolt-nut connections with excellent anti-loosening performance are always needed. In this paper, the slight pitch difference is considered between the nut and bolt threads to imp...
Article
Full-text available
In industrial field, the bolt-nut connection is widely used and unitized as an important machine component. In the previous studies, a bolt-nut connection with slight pitch difference was considered towards realizing anti-loosening performance and high fatigue strength through axisymmetric finite element method (FEM) as well as experiment. And by a...
Article
Micro-bond test is often used to investigate fiber/matrix bonding behavior. In this experiment, the average shear stress is generally used as the interface strength without considering the singular stress. Therefore, in this paper, the intensity of singular stress field (ISSF) is newly analyzed at the fiber entry/exit points. The obtained ISSFs at...
Article
Our previous studies analyzed the adhesive strength of butt joint systematically in terms of the intensity of singular stress field (ISSF) by using two-dimensional modeling. In consideration of the actual specimen geometry, in this paper, the adhesive strength of butt joint is analyzed by using three-dimensional modeling. A mesh-independent numeric...
Article
Full-text available
In this study, the effect of curvature radius of the thread bottom and the pitch difference between of M16 bolt and nut on fatigue strength for bolted joint is considered experimentally. The M16 bolt-nut specimens having the two kinds of thread bottom radii and the pitch differences are prepared. The S-N curves for bolted specimens with different t...
Article
In this paper, we discuss the bad pair condition causing a singular stress at a vertex of the interface in three dimensional (3D) prismatic butt joints in comparison with the bad pair condition along the side. 3D finite element (FE) eigenanalysis is applied to obtain the singular index. We found that the bad pair condition at a vertex is slightly d...
Article
In our earlier study, the authors revealed that the fatigue limit of ductile cast iron (DCI) specimens whose shapes are similar to the welded joint shapes is about three times larger than that of the welded joint specimens. However, since many defects are usually included in the DCI specimens, the fatigue limit of DCI joints decreases with increasi...
Article
This study deals with nanobubble generator using honeycomb structures producing a large amount of water including large nanobubble density in a short time. Here, the nanobubble generating performance is investigated for large and small apparatus having different honeycomb cell dimensions by applying a computational fluid dynamics (CFD) coupled with...
Article
Full-text available
In a wide industrial field, the bolt-nut joint is unitized as an important machine element and widely used. To ensure the safety of the structure and reduce cost, low-cost bolt-nut connections with good anti-loosening performance and high fatigue strength are always required. In our previous papers, the effect of pitch difference between a bolt and...
Article
Roller chains are commonly used for transmission of mechanical power on many kinds industrial machinery. Roller chain makers have done a lot of efforts to improve the wear resistance by using conventional types of wear testing machine. However, such conventional wear testing needs huge amount of time and cost. Therefore, this study focuses on devel...
Article
Bimetallic rolls are used in steel rolling industries because of their excellent hardness and wear resistance. To reduce the center residual stress, quenching heating treatment is performed immediately after heating the roll nonuniformly instead of uniformly. In this study, we found that by using a nonuniform heating quenching method the maximum te...
Article
Full-text available
In this study fatigue experiments are conducted for ductile cast iron (DCI) to compare with the fatigue strength of cruciform welded joints. Here, several DCI specimens are prepared to have nearly the same fatigue strength in smooth specimens before welding and to have similar cruciform shapes in the welded joints. It is found that the fatigue stre...
Article
Full-text available
Considerable residual stress is produced during heat treatment. Compressive residual stress at the shell is conductive to improving the thermal fatigue life of a work roll, while tensile stress in the core could cause thermal breakage. In hot rolling, thermal stress occurs under the heating-cooling cycles over the roll surface due to the contact wi...
Article
This paper deals with a partially-embedded single-fiber under pull-out force in comparison with a single fiber embedded in matrix focusing on two distinct singular stress fields. Then, the intensities of the singular stress fields (ISSFs) are compared at the fiber end named Point A and the fiber/surface intersection named Point E. The results show...
Article
Employing mixed adhesive joints has been proven to be very useful. This type of joint leads to improved performance by increasing strength and decreasing stresses in critical areas of the joint. In the same way, the use of the Intensity of Singular Stress Field (ISSF) has been shown to be suitable for adhesive joint calculation, since the adhesive...
Article
In this paper, a new solution is discussed for the stress intensity factor of an edge interface crack. The intensity of the singular stress field (ISSF) at the interface end before appearing the edge interface crack is distinguished from the stress intensity factor (SIF) of the interface crack itself. By considering those two distinct double singul...
Article
Full-text available
In the previous studies, a bolt-nut connection with slight pitch difference was considered towards realizing anti-loosening performance and high fatigue strength through axisymmetric finite element method (FEM) as well as experiment. In this study, screwing process before the nut touching the clamped body is analyzed through three dimensional FEM....
Article
Full-text available
In a previous study, the authors have shown that the debonding strength can be expressed as a constant value of the intensity of the singular stress field (ISSF). Previously, two models were considered in discussing the ISSF; one is a two-dimensional butt joint under plane strain and the other is a three-dimensional prismatic butt joint having shar...
Article
Full-text available
The bimetallic work rolls are widely used in the roughing stands of hot rolling stand mills. The rolls are classified into two types; one is a single-solid type, and the other is a shrink-fitted assembled type consisting of a sleeve and a shaft. Regarding the assembled rolls, the interfacial creep sometimes appears between the shaft and the shrink-...
Article
Full-text available
In a wide industrial field, the bolt-nut joint is unitized as an important machine element although anti-loosening performance is always required. In this paper, the effect of slight pitch difference between bolt and nut is studied. The prevailing torque required for the nut rotation is analyzed before the nut touches the clamped body as well as th...
Article
Full-text available
In our earlier study, the authors revealed that the fatigue limit of ductile cast iron (DCI) specimens whose shapes are similar to the welded joint shapes is about three times larger than that of the welded joint specimens. However, since many defects are usually included in the DCI specimens, the fatigue limit of DCI joints decreases with increasi...
Article
In this study, the impact strength of notched specimens of polymeric materials was studied by using high speed tensile test. Focusing on the strain rate at the notch root, the final fracture elongation was expressed in terms of the time-temperature superposition principle. Fracture behavior under various impact speed and temperature can be predicte...
Article
Full-text available
The bimetallic work rolls are widely used in the roughing stands of hot rolling stand mills. The rolls are classified into two types; one is a single- solid type, and the other is a shrink-fitted assembled type consisting of a sleeve and a shaft. Regarding the assembled rolls, the interfacial creep sometimes appears between the shaft and the shrink...
Article
Full-text available
In this study fatigue experiments are conducted for ductile cast iron (DCI) to compare with the fatigue strength of cruciform welded joints. Here, several DCI specimens are prepared to have nearly the same fatigue strength in smooth specimens before welding and to have similar cruciform shapes in the welded joints. It is found that the fatigue stre...
Article
Ceramic roller can be used in the heating furnace conveniently because of its high temperature resistance. The roller consists of ceramic sleeve and steel shaft connected only under a small shrink fitting ratio because of the brittleness. However, the coming out of the shaft sometimes happens from the ceramic sleeve under repeated loading. Therefor...
Chapter
In this study, the strain rate concentration is considered for high speed tensile test, which is now being recognized as a standard testing method. To evaluate the impact strength of engineering materials, Izod and Charpy tests are unsuitable since they cannot control the impact speeds and therefore the testing results do not coincide with the real...
Article
Full-text available
The bimetallic work rolls are widely used in the roughing stands of hot rolling stand mills. The rolls are classified into two types; one is a single-solid type, and the other is a shrink-fitted construction type consisting of a sleeve and a shaft. Regarding a shrink-fitted construction type, the interfacial creep sometimes appears between the shaf...
Article
The water and sewer system is becoming obsolete in Japan. It is necessary to find out the water stopping method to reinforce and repair the construction site while operating the water supply and sewer functions as usual other than the construction site. In this study, we focused on sewer pipe plug that can be installed and removed in a short time,...
Article
In this study, the strain rate concentration factor is considered for high speed tensile test. For notched specimens, the strain rate at the notch root εnotch cannot be determined experimentally and has to be studied analytically. In this study, therefore, the strain rate concentration factor defined as Ktε = εnotch/εsmooth is calculated by varying...
Article
In a wide industrial field, the bolt-nut joint is unitized as an important machine element and widely used. To ensure the safety of the structure and reduce cost, low-cost bolt-nut connections with good anti-loosening performance and high fatigue strength are always required. In our previous papers, the effect of pitch difference between a bolt and...