研究者業績
基本情報
- 所属
- 兵庫県立大学 大学院工学研究科 機械工学専攻 准教授
- 学位
- 博士（工学）(*姫路工業大学*)
- J-GLOBAL ID
- 200901089607371805
- researchmap会員ID
- 1000254215
研究分野
4経歴
2-
2008年4月 - 現在
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1996年4月 - 2008年3月
受賞
9論文
107-
Journal of Advances Joining Processes 13 100373 2026年1月 査読有り筆頭著者責任著者Direct friction welding between type 7075-T6 aluminum alloy (AA7075) and low carbon steel (LCS) is particularly difficult, as cracking often form in the AA7075 flash and propagate to the weld interface during the welding process. This study investigated the simultaneous friction welding of AA7075 and LCS using commercially pure titanium (CP-Ti) as an insert metal in a single-step process, with the aim of achieving a joint free of cracks into the AA7075 flash. The joint free of cracks into the AA7075 flash was not obtained by varying of only the shape of the CP-Ti insert metal. However, flash cracking could be prevented when the weld diameter of the AA7075 side was larger than that diameter of the CP-Ti insert metal, and used with a suitable shape of CP-Ti insert metal having the groove to the AA7075 side. Furthermore, the joint having high tensile strength exceeding the yield strength of the LCS base metal was achieved; specifically, a forge pressure of 400 MPa resulted in approximately 83% of the tensile strength of the LCS base metal. Despite these improvements, the good joint such as fracture occurring within the LCS base metal could not be realized, since the adjacent region of the LCS side is not much deformed even if the joint is made with high forge pressure. Hence, further optimization of the CP-Ti insert metal shape is essential to promote greater deformation of the LCS side and enhance overall joint characteristics.
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4th Joint Symposium on Advanced Mechanical Science and Technology (4th JSAMST) SP-68 2024年9月 査読有り
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4th Joint Symposium on Advanced Mechanical Science and Technology (4th JSAMST) SP-63 2024年9月 査読有り
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4th Joint Symposium on Advanced Mechanical Science and Technology (4th JSAMST) SP-61 2024年9月 査読有り
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4th Joint Symposium on Advanced Mechanical Science and Technology (4th JSAMST) SP-50 2024年9月 査読有り
MISC
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｢先進自動車製造技術における接合技術2025(JAAA2025)｣シンポジウム講演論文集 113-117 2025年11月 査読有り
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｢先進自動車製造技術における接合技術2025(JAAA2025)｣シンポジウム講演論文集 96-101 2025年11月 査読有り筆頭著者責任著者
書籍等出版物
1講演・口頭発表等
293-
日本機械学会 関西支部 第80期定時総会講演会 講演論文集 2005年3月19日 日本機械学会 関西支部This paper describes the effect of epoxy resin property on the reliability of semiconductor using a solder bump. First, thermal stress at the solder bump-Si chip interface was analyzed using a numerical method (two-dimensional elastic-plastic finite element analysis). Second, the reliability of semiconductor was evaluated by the energy release rate when the crack grew. Third, the effect of resin property on the deformation of substrate was analyzed. The numerical-calculation results showed that the Young's modulus of epoxy resin influenced significantly the value of this stress. As a result, reliability of semiconductor was able to be improved by icreasing Young's modulus value of the epoxy resin. Furthermore, the deformation of substrate decreased by reducing Young's modulus value of the epoxy resin.
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日本機械学会 関西支部 第80期定時総会講演会 講演論文集 2005年3月19日 日本機械学会 関西支部To apply the ferromagnetic shape memory composites composed of a shape memory alloy and ferromagnetic material as a magnetic-drive mechanism fast actuator material, the deformation behavior of a ferromagnetic shape memory composite plate was examined. First, the stress-strain relation of a shape memory alloy was analyzed using thermo-mechanical composition equation. The relation between the bending moment and the curvature of the composite plate was calculated by using the stress-strain curves of the constituent materials. Then the effects of the material characteristic on deformation behavior were clarified from the obtained results.
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日本機械学会 関西支部 第80期定時総会講演会 講演論文集 2005年3月19日 日本機械学会 関西支部In this study, a new method to evaluate peel strength of the interface between film and base using energy release rate has been developed. For evaluation of peel strength of thin film, energy release rate on based linear fracture mechanics cannot be applied because the deformation of the thin film is very large. Then, energy release rate in consideration for geometrical non-linearity is calculated about disk model under inner pressure and cantilever model under mixed mode loading. Various parameters on the non-linearity which effects on energy energy release rate are examined. As a result, energy release rate in consideration for geometrical non-linearity could be used to evaluate peel strength of thin film.
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日本機械学会 関西支部 第80期定時総会講演会 講演論文集 2005年3月18日 日本機械学会 関西支部When the capsule type strain gage is used for strain measurement of cast iron, the shearing force in the spot weld is produced from the difference of the amount of the deformation of the capsule gage and cast iron. And, the actual strain caused in cast iron cannot be accurately measured because this shearing force deforms the spot weld. In this research, the shearing force caused in the spot weld was analyzed taking this deformation into consideration. As a result, it was clarified that a constant ratio existed between the measured strain by gage and the actual strain caused in cast iron. Therefore, the actual strain in cast iron can be estimated from the capsule gage output value and a constant ratio.
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溶接学会 全国大会 講演概要 2004年4月22日 溶接学会摩擦圧接の圧接面における焼付現象を解明するため，摩擦温度および負荷圧力を変えて軟鋼同士を擦り合わせて摩擦面を観察した．その結果，摩擦温度の上昇に伴って摩擦面のむしられた状態が増加し，負荷圧力を増加させると低い摩擦温度でむしられた状態となり，この部分から焼付くことが明らかとなった．
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溶接学会 全国大会 講演概要 2004年4月22日 溶接学会摩擦圧接の圧接面における焼付現象を解明するため，摩擦速度および摩擦圧力を変化させて円管同士の摩擦圧接を行い，圧接面の周速度と焼付温度の関係を検討した．その結果，相対速度が速い場合は高い温度で，遅い場合は低い温度で焼付き，摩擦圧力を増加させるとより低い温度で焼付くことがわかった．
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日本機械学会 第11回機械材料・材料加工技術講演会 講演論文集 2003年11月18日 日本機械学会 機械材料・材料加工部門This report describes the joint strength of fine grained steel (FGS) friction welded joints by using the low heat input friction welding method (LHI method) which was developed by authors. The FGS base metals were joined by using the continuous drive friction welding machine with an electromagnetic clutch in order to prevent braking deformation during rotation stop. It was clarified that the friction welded joints with 100% joint efficiency could be obtained by using only the friction stage up to initial torque without the forge (upsetting) stage. That is, the joint tensile strength of the friction welded joints was obtained at the time that the friction torque reached the initial torque. In addition, the joint welded by the LHI method did not cause softening and the grain growth in the heat affected zone. As a conclusion, the LHI method without the forge stage to the FGS base metal welds provides the advantages of less burn-off, less burr, non-softening and less grain growth.
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溶接学会 全国大会 講演概要 2003年10月7日 溶接学会Ti-6Al-4VとA5052の摩擦圧接において，摩擦時間とアプセット圧力を種々変化させ接合を行った．その結果，初期トルク到達直後に圧接面の相対速度を瞬時に零とし，同様にアプセット圧力を付加することで寄り代が非常に少なく，A5052母材とほぼ同等の強度を持つ継手が得られることがわかった．
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溶接学会 全国大会 講演概要 2003年10月7日 溶接学会炭素含有量が異なる各種鋼材の接合に入熱量半分以下で接合が可能である低入熱摩擦圧接法を適用し，継手強度に及ぼす摩擦圧力の影響を検討した．その結果，母材と同等の強度を有する継手を得るためには，炭素含有量の多い材料ほど摩擦圧力を増加させる必要があることが明かとなった．
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溶接学会 全国大会 講演概要 2003年10月7日 溶接学会A7075摩擦圧接継手の継手強度に及ぼす時効処理の影響を明らかにするため、自然および人工時効処理を施した継手強度の検討を行った。その結果、溶接直後では母材の約63%であった継手強度が、180日の自然時効で約88%まで、120℃-48時間の人工時効で約95%まで継手強度が増加した。
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溶接学会 全国大会 講演概要 2003年10月7日 溶接学会角棒の摩擦圧接について、母材から破断する健全な継手を得るために様々な検討を行った。その結果、角棒と丸棒の組み合わせにおいて、圧接面同士の相対速度を瞬時に零とし、さらにアプセット圧力を付加する接合方法によって、母材と同等の強度を有し、かつ母材から破断する継手が得られることを明らかにした。
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日本機械学会 関西支部 第78期定時総会講演会 講演論文集 2003年3月 日本機械学会 関西支部The purpose of this study is to establishe the measuring method of elastic wave velocity of a thin film coated on substrate with an acoustic microscope. When the thickness of film is less than about 10μm, the measured elastic wave velocity is influenced by the properties of substrates. In this study, a new method that can measure the elastic wave velocity of TiN thin film with a thickness of 1μm or less, has been developed.
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日本機械学会 関西支部 第77期定時総会講演会 講演論文集 2002年3月23日 日本機械学会 関西支部This report describes relationship between friction time in friction stage and joint strength of friction welding joints. The materials used were mild carbon steels, and a brake type friction welding equipment was used for joining. In actual experiment, the electromagnetic clutch was used in order to exclude the braking deformation at rotation stopping. As experimental method, the relative speed was instantaneously rendering to zero at each friction time. The authors have determined that 100% of joint efficiency in tensile test, i. e. all joints fracture at substrate (not at interface), could be achieved without upsetting stage. That is, the tensile strength of the friction welded joints were dominated by friction welding process until the time that the friction torque reached to the initial peak torque. These joints could be bent in 90 degrees-bend tests, and this result was same as that of the joints welded by conventional welding process, i. e. by using upsetting stage. As a conclusion, the friction joints welded by using no upsetting stage have same mechanical properties as those welded by conventional friction welding process including that. The experimental method without upsetting stage has some advantages, e. g. less burn-off and the burr.
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日本機械学会 材料力学部門講演会 講演論文集 2001年8月3日 日本機械学会 材料力学部門This report describes the study on joining phenomena in 1st phase of friction welding. Observation of the joining phenomena showed that during the weld faying surfaces rubbed each other, the friction torque was maintained nearly constant. The seizure and the joining occurred at the center portion of them. Then, as they extended from the joint center axis toward the periphery (outer surface), the friction torque increased rapidly. The friction torque reached to the initial peak torque after the welded interface was joined completely, and upsetting of both substrates occurred. It was clarified that the friction time from the friction start (surface contacting) to the initial torque, hereafter called as "elapsed time for initial torque", were variant with the pre-heat at the weld faying surface. The initial torque and the elapsed time for initial torque decreased with increasing the weld faying surface temperature. As a conclusion, the 1st phase can be divided the initial friction part and the seizure part, and the mechanism in the 1st phase of friction welding will be clarify by them.
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日本機械学会 材料力学部門講演会 講演論文集 2001年8月3日 日本機械学会 材料力学部門This report describes the simulation of friction torque and temperature at welded interface in 1st phase of friction welding. The simulation models at the initial friction part and the seizure part were made from the observed joining phenomena at the 1st phase. In actual simulation, the real contact area and the thermal stress at welded interface in initial friction part, and the seizure temperature and the relative speed of welded interface in seizure part were considered. The calculation of the friction torque and the temperature at welded interface were carry out in compound of the friction pressure, the relative speed and the flow stress at base metal. The calculated values about friction torque, initial torque and elapsed time for initial torque were approximately consistent the experimental values. The calculated values about temperature at welded interface of center portion were higher than that of periphery (outer surface) portion at the time that the friction torque reached to the initial torque. As a conclusion, the friction torque and the temperature at welded interface could be simulated by the made simulation model in 1st phase of friction welding.
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日本機械学会 関西支部 第75期定時総会講演会 講演論文集 2000年3月17日 日本機械学会 関西支部This report describes the simulation of temperature at weld interface on friction welding. It was observed that the jointed region was occurred at the center portion on weld interface under the experiment. The simulation was noticed the yield stress at weld interface of specimen and made the model for the jointing mechanism. The analysis of temperature at weld interface was based on the jointing mechanism and applied two-dimensional unsteady-state conduction equation. The jointed region was occurred at the center portion so that the temperature of the center portion supplanted that of the periphery (outer surface) for yield stress depended on the temperature at weld interface. Comparing with the calculated and experiment values for the temperature at axial direction of specimen, it was approved that the slope of temperature coincided well. As a conclusion it is considered that the jointing mechanism was predicted by the simulation.
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日本機械学会 関西支部 第75期定時総会講演会 講演論文集 2000年3月17日 日本機械学会 関西支部The surface wave velocity, C_R, depends on the stress, therefore, it is possible to evaluate the stress by using the C_R. The measured value of C_R is determined by V(z) curve obtained by the scanning acoustic microscope (SAM). But the C_R is influenced by the surface roughness, R, of sample, therefore it is problem to evaluate the stress by using the obtained C_R. In this paper, After the surface of sample was polished with emery paper, the R and the C_R were measured. And the effect of the R on the C_R was examined. As a result, the relation between R and C_R was obtained.
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日本機械学会 関西支部 第75期定時総会講演会 講演論文集 2000年3月17日 日本機械学会 関西支部This study deals with the bonding stress at flip-chip microjoints of LSI using an anisotoropic conductive adhesive. Bonding stress distribution were analyzed using a two-dimensional finite element method. The calculated results showed that the maximum normal stress at the outer bump-electrode interface differed from the inner one. Furthermore, some effects of Young's modulus and height of the substrate on normal stress at the bump-electrode interface were shown. As a conclusion, it was found that normal stress at the bump-electrode interface was able to be relaxed by reducing Young's modulus value of the substrate compared with that of bump-electrode.
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日本機械学会 関西支部 第75期定時総会講演会 講演論文集 2000年3月17日 日本機械学会 関西支部When an ultrasonic wave reaches an interface between two solid media, four waves are generated by reflection, refraction and mode transfer. This paper discribes the simulating method of the received waveform propagated though an interface between two media by using the ray model. A simple analytical model composed of cylindrical aluminum and epoxy resin is prepared for this simulation. Effects of sonic damping, partition of energy and phase are considered in the analysis. And gaussian distribution is assumed in order to represent the intensity distribution formed by sonic field. Simulation results of the waveform are well agreed with the actual experimental results that are obtained using the ultrasonic measuring device.
担当経験のある科目(授業)
20共同研究・競争的資金等の研究課題
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日本学術振興会 科学研究費助成 2024年4月 - 2027年3月
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日本学術振興会 科学研究費助成 2021年4月 - 2024年3月
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日本学術振興会 科学研究費助成 2019年4月 - 2023年3月
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日本学術振興会 科学研究費助成 2016年4月 - 2019年3月
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日本学術振興会 科学研究費助成 2015年4月 - 2019年3月
学術貢献活動
9-
パネル司会・セッションチェア等溶接学会 軽構造接合加工研究委員会 2021年11月30日 - 2021年11月30日
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パネル司会・セッションチェア等日本機械学会 関西支部 2019年3月11日 - 2019年3月11日
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パネル司会・セッションチェア等日本機械学会 生産加工・工作機械部門 2018年10月14日 - 2018年10月14日
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パネル司会・セッションチェア等日本機械学会 材料力学部門 2017年10月9日 - 2017年10月9日