著者

北野 誠 西村 朝雄 河合 末男

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.57, no.538, pp.1398-1405, 1991-06-25 (Released:2008-02-21)

参考文献数

5

被引用文献数

2 1

---

The plastic packages of ICs have been changing from insertion types to surface mounted types. Reflow soldering is used for surface mounted ICs onto printed circuit boards. During this process, packages are heated to above 200°C. If the encapsulant absorbs moisture, package cracking may occur during the reflow soldering. It is known that the cracks are caused by vapor pressure generated inside the packages, causing excessive stress in the plastic. In the former report, moisture diffusion analysis in the plastic was performed and vapor pressure could be obtained. Since the edge tip of the chip pad where package cracking occurs is a singular point within the elastic stress field, strength evaluation for package cracking is not established. In this study, the quantitative strength evaluation of the plastic is investigated by using the stress singularity theory.

著者

浜田 実 門田 浩次 小玉 淳

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:03875008)

巻号頁・発行日

vol.49, no.447, pp.1427-1433, 1983

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半無限体や厚板などの軸対称弾性問題に有効なハンケル変換をシンプソン積分法により行う場合,積分核として含まれるベッセル関数の振動性のため,精度のよい結果を得ることが困難である.そこで本研究では,フーリエ変換におけるFilonの方法にならい,被変換関数&fnaf;(x),またはx&fnaf;(x)を区分的に二次関数で近似し,これにベッセル関数を乗じた積分値をロンメル関数で表わして値を求める方法を提案する.また,二つの例題により本方法の有効性を示す.

著者

臺丸谷 政志 小林 秀敏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.77, no.776, pp.638-646, 2011

被引用文献数

1

---

The Japanese sword is a weapon peculiar to Japan. The Japanese sword is interesting not only from the viewpoint of traditional crafts of arts, but also from the aspect of modern science and technology because the way of making and its functionality as a weapon are really consistent with science. The present study is concerned with the connection between <i>tohshin</i> (blade) and <i>tsuka</i> (hilt) of the sword. Only one <i>mekugi-take</i> (retaining peg made of bamboo) with about 5mm in diameter holds <i>Nakago</i> (tang) in the hilt. However the slender <i>mekugi</i> might not be broken, even though in the case of violent sword-fighting. This fact has been historically demonstrated in many battles by Japanese swords. In this study, using a <i>Tachi</i> being the typical Japanese sword, it is examined theoretically and experimentally from the viewpoint of impact engineering why a <i>mekugi</i> used in Japanese swords might not be broken. As a result, it is made clear that such a strong force as breaking <i>mekugi-take</i> does not act on it, because of the location of <i>mekugi-ana</i> (a hole for <i>mekugi</i>) in the tang, which has been made by the traditional code of sword-smiths.

著者

中 庸行 山本 /和人 磯野 吉正 田中 武司 寺山 暢之

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.66, no.644, pp.698-705, 2000-04-25

参考文献数

17

被引用文献数

2 5

---

This paper describes the evaluation of adhesion strength between the amorphous Silicon carbide (a-SiC) thin film, Diamond-Like Carbon (DLC)/a-SiC laminated thin film and materials used for the cutting tool. The a-SiC and DLC/a-SiC thin films were deposited on the tungsten carbide steel substrate:K10 and on the high speed steel substrate;SKH51 by Plasma-Enhanced CVD method of the hot cathode PIG discharge type. Scratch tests were carried out for examining the critical fracture load of the films. Finite Element Method (FEM) analyses were also performed to clarify the stress distribution at the interface between the films and substrates. The stress intensity factors K<SUB>I</SUB> and K<SUB>II</SUB>and the fracture toughness K<SUB>C</SUB> were calculated from results of scratch tests and FEM analyses. The K<SUB>I</SUB>, K<SUB>II</SUB>and K<SUB>C</SUB> of a-SiC and DLC/a-SiC thin films deposited on the K10 substrate were larger than those of the thin films deposited on the SKH51 substrate. The K<SUB>I</SUB>, K<SUB>II</SUB> and K<SUB>C</SUB> of both of the films were directly proportional to the density of a-SiC thin films. In turning experiments, the delamination area of DLC/a-SiC thin films deposited on the cutting tool of K10 is closely related to the K<SUB>C</SUB> obtained from the scratch tests and FEM analyses.

著者

中 庸行 磯野 吉正 田中 武司 寺山 暢之

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.65, no.634, pp.1427-1434, 1999-06-25

参考文献数

15

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This paper describes the microstructural effect of Diamond-Like Carbon (DLC) thin film on micro-tribological properties. DLC thin films with density of 1.9-2.4 g/cm<SUP>3</SUP> were deposited on Silicon (111) surface by Plasma-Enhanced CVD method of the hot cathode PIG discharge type. The effect of deposition conditions on the microstructure of DLC thin film was evaluated by Raman spectroscopy. Increasing the bias voltage and the discharge current shifted the peak of the G-band shift toward high frequency and enlarged I (D)/I (G) ratio. Pin-on-Plate friction experiments were carried out using a diamond pin in high vacuum. The friction coefficients of DLC thin films indicated constant values during the friction. The friction coefficients increased with shifting G-band toward low frequency in the range above 1540 cm<SUP>-1</SUP>, but those did not vary with increasing I (D)/I (G). The friction coefficients were directly proportional to density of the film. Molecular orbital calculations revealed that the adhesion energy on the sp<SUP>3</SUP> bonding atom cluster was higher than that on the sp<SUP>2</SUP> bonding atom cluster.

著者

中 庸行 磯野 吉正 田中 武司 寺山 暢之

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A (ISSN:03875008)

巻号頁・発行日

vol.64, no.620, pp.1061-1068, 1998-04-25

参考文献数

19

被引用文献数

2

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This paper describes the effect of density of Diamond-Like Carbon (DLC) thin film on tribological property. DLC thin films having the density of 1.9-2.5 g/cm<SUP>3</SUP> were prepared on (111) of Silicon surface by the hot cathode PIG Discharge Type Plasma-Enhanced CVD method. Ball on disk friction experiments were carried out using diamond ball. The friction coefficients increased from 0.05 to 0.20 with increasing film density in the density range below 2.185 g/cm<SUP>3</SUP>, but those did not change above 2.185 g/cm<SUP>3</SUP>. The specific wear value also increased with increasing film density. The effect of film density on tribological property between DLC thin film and diamond pin was examined by molecular dynamics simulation. The diamond pin slides to uniaxial direction on DLC thin film having the density 1.5-3.0 g/cm<SUP>3</SUP>. Atoms of DLC thin film having the density of 1.5 g/cm<SUP>3</SUP> were moved most actively. Atomic movement being like to shear deformation was observed during frictional processes. The effect of film density on friction coefficients in MD simulations was similar to that in experiments qualitatively.

著者

松井 勝幸 衛藤 洋仁 雪竹 克也 三阪 佳孝 安藤 柱

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.66, no.650, pp.1878-1885, 2000-10-25

参考文献数

13

被引用文献数

9 11

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The surface refining method is a useful technique to improve the fatigue limit of gears. One of the methods is the Carburizing Method. To increase the fatigue limit of the Carburized gears, the following five techniques need to be developed:a)Reduce abnormal surface structure. b)Obtain a fine grain size. c) Decrease the retained Austenitic structure. d)Increase hardness under the surface. e)Improve the residual stress distribution under the surface. For this purpose, the authors conducted a study by using DSG1 steel gears on the new compound surface refining method consisting of Vacuum Carburizing, Contour Induction Hardening and Double Shot Peening. The results showed that the fatigue limit of the gears processed by the new compound surface refining method achieved 125% better than that of the conventional Vacuum Carburized gears.

著者

東藤 貢 高橋 清 / KAUSH H. Henning

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A (ISSN:03875008)

巻号頁・発行日

vol.64, no.617, pp.36-43, 1998-01-25

参考文献数

13

被引用文献数

2 2

---

Mode I fracture behavior of rubber toughened PMMA (RTPMMA) was studied over five decades of displacement rates (10<SUP>-4</SUP>-13 m/s) using a high-speed tensile testing machine. Two kinds of RTPMMA, extruded RTPMMA containing 20 wt.% rubber particles (EM20) and pressed RTPMMA containing 40 wt.% rubber particles (PM40), exhibited different rate dependences of the maximum stress intensity factor K<SUB>1max</SUB> and the maximum energy release rate G<SUB>1max</SUB>. K<SUB>1max</SUB> and G<SUB>1max</SUB> of EM20 decreased rapidly at high rates (1-11 m/s). This suggests that the toughening effect due to rubber blending was dramatically reduced at the high rates. On the other hand, PM40 maintained high K<SUB>1max</SUB> and G<SUB>1max</SUB> values at all rates tested in this study. Thus, PM40 maintained the toughening effect even at high rates up to 13 m/s. For comparison, unmodified PMMA was also examined, and the results showed that K<SUB>1max</SUB>of neat PMMA increased with the increase in displacement rates and G<SUB>1max</SUB> remained constant as the rate increased. Discussion is given on the rate-dependent K<SUB>1max</SUB> and G<SUB>1max</SUB> values, taking (K<SUB>1max</SUB>)<SUP>2</SUP>/G<SUB>1max</SUB>into account. The fracture surface morphology of the specimens is also discussed.

著者

三戸 暁 町田 邦郎

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.45, no.394, pp.559-566, 1979-06-25 (Released:2008-02-21)

参考文献数

11

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伸びの異なる2種類の金属繊維を用いて,エポキシ樹脂を強化した複合材料を試作し,その常温クリープ挙動を調べた.その結果,伸びの小さいタングステン繊維を含む複合材料は,みかけ上遷移,定常,加速クリープを示し,繊維,母材ともに破断したが,体積率の小さな試験片ではタングステン繊維にマルチプルネッキングが生じた.一方,伸び大きいステンレス繊維を含む複合材料は,対数クリープだけを示し,この傾向は高体積率,低応力になるほど著しく,また,クリープ破断は母材だけでおこり,繊維は母材から引き抜けた.

著者

岩本 正実 田中 英一 伝田 耕平 山本 創太

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.71, no.705, pp.872-879, 2005-05-25 (Released:2011-03-02)

参考文献数

19

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An anisotropic inelastic constitutive model of cortical bone was formulated to predict deformation and failure behavior in traffic accidents or falling by utilizing the framework of viscoplasticity and damage mechanics. The model can represent characteristic features of cortical bone, such as anisotropic elastic coefficients with strain rate dependency, viscoplasticity with strength anisotropy as well as strength asymmetry of tension and compression. The damage evolution equation also enables us to predict bone failure with rate dependency. Experimental data of uniaxial compressive or tensile loading tests of human cortical bone at various strain rates were used to validate the proposed model. Predicted stress-strain curves and failure points agreed well with those of experimental data at wide range of strain rates. This shows the present model can be used to predict bone failure in various impact simulations of traffic accidents or falling.

著者

陳 錦祥 橋本 良作 福山 佳孝 松下 政裕 小河 昭紀 大沢 真人 横川 忠晴 厚田 広史

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A (ISSN:03875008)

巻号頁・発行日

vol.72, no.716, pp.432-437, 2006-04-25

参考文献数

19

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The effects of crystal orientation (&theta;) on the structural strength of single crystal trubine vanes and blades calculated with the finite element method (FEM) are discussed in this paper. TMS-75, a 3<SUP>rd</SUP> generation single-crystal Ni-base superalloy, is chosen as the model material for turbine vanes and blades. It became clear that, (1) the elastic constant matrix changes were equivalence for each of three coordinate due to the orientation variation (0&deg;<&theta;<90&deg;), and the strength of the turbine vane and blade were strongly related to &theta;, and also depended on the load and model shape. (2) The strength dependence of the turbine vane on the crystal orientation was depended on coordinate plane : there are lower Mises stress in XY plane and maximum Mises stress in near the &theta;=45&deg;at both YZ and ZX Planes. (3) In the case of a blade, the influence is similar to the vane on blade tip, but the converse holds for the blade root. It is clear that the creep rupture time can be extended, when the <100> crystallographic axes is the Y or X axis of the blade under higher revolution speed.

著者

河村 勇太 苗村 潔

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.75, no.756, pp.1124-1126, 2009-08-25 (Released:2017-06-09)

参考文献数

4

被引用文献数

1 1

---

The colonoscope is widely employed for cure of a large intestinal disease. However, the medical accidents such as large intestines perforation by an immature doctor is still increase, because insertion operation of the colonoscope is highly skillful. To solve this problem, We think that development of a training device is effective. We aim to verify whether the porcine large intestines are able to become substitute as the human large intestines. The tensile experiment and the punch experiment were conducted on 243 samples of 14 pigs. The tensile experiment showed that stress at break was 0.20±0.08MPa, and strain at break was 0.51±0.24, and Young's modulus was 0.42±0.22MPa, and the poisson ratio was 0.71±0.22. Imitative endoscope extended the porcine large intestines forward perpendicular direction from the surface. The results showed the porcine large intestines were perforated by 11.9±2.8N. All results showed that porcine large intestines were able to become substitute of human large intestines.

著者

村上 敬宜 金崎 俊彦 福島 良博 田中 裕之 戸室 仁一 久保山 孝治 松栄 雅樹 伊藤 義雄 安藤 晴彦

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.75, no.749, pp.93-102, 2009-01-25 (Released:2017-06-09)

参考文献数

6

被引用文献数

4 7

---

The fatigue failure analysis of SUS316L flexible hose of the hydrogen station which was demonstrated during EXPO 2005 in Nagoya was carried out. The fatigue fracture surface where hydrogen leakage was detected showed clear striations which revealed a unique evidence of hydrogen effect on the ratio of striation height and spacing. The number of striations observed on the leakage fracture surface was 270. Considering that the number of hydrogen supply to the fuel cell buses was 280, it can be concluded that the fatigue fracture process during the demonstration is completely controlled by microplasticity resulting ductile fracture contrary to the conventional concept expressed with a term of decohesion or hydrogen embrittlement. The striation data were used to make the fatigue crack growth rate equation which was applied to the life prediction and structural integrity assessment for a new hydrogen station. The fatigue crack growth data showed the evidence of a strong frequency effect of fatigue crack growth rate of SUS316L used in the hydrogen environment with 8 minutes hydrogen supply time at the hydrogen station.

著者

Oda Juhachi Sakai Shinobu Kemmochi Satoru

出版者

日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:03875008)

巻号頁・発行日

pp.431-436, 1997-02-01

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金沢大学工学部

著者

酒井 譲 山下 彰彦

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.67, no.659, pp.1093-1102, 2001-07-25 (Released:2008-02-21)

参考文献数

12

被引用文献数

11 7

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As a meshless numerical analysis, particle methods are considered promising in the filed of fluid dynamics and structural analyses. SPH (Smoothed Particle Hydrodynamics), which has been mainly applied to super fast impact or collision problems, is expected to be a more powerful tool for general structural problems such as large deformation and general 3-dim structural problems of complex geometrical objects. However, the fundamental characteristics (accuracy and convergence of solution, effects of time increment and artificial viscosity, etc) of particle methods have not been clarified at all, which causes the fatal limitation of this method. This paper discussed the several numerical properties of SPH by comparing FEM results. It is shown that structural analysis by particle method (SPH) has relatively good accuracy, as well as good numerical convergence and stability in comparison with traditional method (finite element method) and is expected to be a sophisticated tool for a meshless structural analysis.

著者

中山 昇 望月 隆介 澤本 一樹

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.79, no.802, pp.827-837, 2013

被引用文献数

2

---

Porous materials have attracted attention because they exhibit a wide range of useful properties. They are mainly manufactured using either a precursor or a melting method. However, the processes involved are complicated because of the need for a primary extrusion step and the addition of a pore-forming agent. Also, because of the large amount of energy required for the sintering step, these methods represent a large environmental burden. To solve this problem, the present study focused on the formation of solidified porous aluminum by a reaction between pure aluminum powder and pure water, without the need for sintering. The effect of the formation temperature was investigated by measuring the amount of hydrogen released during the reaction, and the density and microstructure of the final materials. X-ray diffraction measurements and compression tests were also carried out. The results of the microstructural observations and X-ray diffraction measurements indicated that, during the reaction, a bayerite layer was formed on the surface of the powder particles. With increasing temperature, the reaction was found to start more quickly and more hydrogen was released. Furthermore, from the compression tests, the initial maximum stress, the plateau stress and the absorbed energy decreased with increasing formation temperature. The results of the present study indicated that it was possible to form highly porous aluminum using the proposed method.

著者

鈴木 秀人 松村 亜紀子 福永 久雄 原口 忠男

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.62, no.603, pp.2501-2505, 1996-11-25

参考文献数

15

被引用文献数

9

---

Influences of the recycling process on the fatigue crack propagation (FCP) property of glass fiber-reinforced PEEK were examined. In the present research the influence of the recycling process on the property of matrix resin was focused on. The main results were as follows: (1)It was noted that the FCP property of recycled PEEK/GF materials were as superior to that of virgin material. (2)The length of glass fibers in PEEK resin as not markedly reduced during the recycling process, due to the good fluidity of PEEK resin. (3)FCP curves on a da/dN-&Delta;K diagram for virgin and recycled PEEK/GF materials were expressed as one curved line on a da/dN-&Delta;K/E diagram. It was found that the elasticity modulus had been improved by repeated melting and crystallization during the recycling process.

著者

矢川 元基 関東 康祐 安藤 良夫

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:03875008)

巻号頁・発行日

vol.49, no.448, pp.1581-1589, 1983

被引用文献数

1 2

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本論文は,ペナルティ関数法を用いた動的接触問題の有限要素法定式化を示したものである.本法の特徴は,体積および質量のない特殊要素を接触面に挿入することにより,接触条件を全体運動方程式に導入する点にあり,方程式の変形や自由度の増加がないようにという利点を有する.最後に,角棒の立て衝突問題の数値解析を行い,本法の妥当性を検証した.

著者

瀧本 昭夫 増田 芳則 小田 直樹 吉松 敦宏

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:03875008)

巻号頁・発行日

vol.54, no.508, pp.2135-2142, 1988

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Fracture tests of unsaturated polyester resin on large, single-edge notched-bend specimens were conducted under static and dynamic bend tests at room temperature. The velocity of a loading point in the three-point bending was changed from 8.3&times;10<SUP>-6</SUP>mm/s to 7&times;10<SUP>5</SUP> times its value. The two types of fracture marks of the both-ends-closed mark (like ellipses) and the one-end-opened mark (like parabolas) were observed and they were expressed by the equation of fracture marks. A rocket mark, defined here, was also often observed in the dynamic bending test and was well-approximated by the equation. The experimental number, percentage, relative interference appearing distance and the calculated relative critical distance of the marks changed with the crack propagation distance and the testing speed. The velocity of a primary crack propagation was measured and approximated by a mixed-condition relation proposed by us. This change and the gammer-letter relation between the velocity and a dynamic stress intensity factor K<SUB>D</SUB> (or a dynamic strain energy release rate, S<SUB>D</SUB>) gives the latter (K<SUB>D</SUB> or S<SUB>D</SUB>) as a function of the crack propagation distance. This provides a good theoretical explanation of the above variations of fracture marks.

著者

影山 雄介 于 強

出版者

社団法人日本機械学会

雑誌

日本機械学會論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A (ISSN:03875008)

巻号頁・発行日

vol.70, no.695, pp.953-961, 2004-07-25

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本論文では,高度な軸制御が要求される工作機械の熱変形における補正制御に階層的応答曲面方から導かれる階層化された近似式を適用した例を示し,この手法の有効性を確認した.