Sumikin Kansai Industries CO.

Tokyo, Japan

Sumikin Kansai Industries CO.

Tokyo, Japan
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Pilchak A.L.,Air Force Research Lab | Nakase K.,Sumikin Kansai Industries Ltd. | Inagaki I.,Nippon Steel & Sumitomo Metal Corporation | Shirai Y.,Nippon Steel & Sumitomo Metal Corporation | And 2 more authors.
Ti 2011 - Proceedings of the 12th World Conference on Titanium | Year: 2012

The strain paths and thermal cycles utilized during thermomechanical processing of two-phase alloys have a pronounced influence on the resulting distribution of grain orientations present and their spatial distribution. For example, large regions of similarly oriented α grains, commonly referred to as microtextured regions or macrozones,may persist despite the imposition of large macroscopic strains. The detrimental effect of microtexture on dwell fatigue life of high temperature alloys is well established; however,considerably less attention has been given to the effects of microtexture on fatigue life during continuous cycling . In the present work, the effects of microstructure and microtexture on the low cycle fatigue (N f≤ 104 cycles) behavior of Ti-6A1-4V have been characterized using electron microscopy. Microstructural parameters such as the volume fraction and size of the α phase were assessedby quantitative metallography while the contiguity of the α phase and the size and shape of the microtextured regions were investigated with electron backscatter diffraction. Variations in microstructure and microtexture due to subtle differences in thermomechanical processing routes have been correlated with variations in fatigue life through the use of quantitative fractography techniques. Using these methods the spatial and crystallographic orientations of fracture facets at small crack lengths have been determined. The results indicate that grains with c-axes are oriented between approximately 25° and 55° from the stress axis are most likely to form cracks that propagate by facet formation on the basal plane. Crack advance by faceted growth occurs readily through grains with similar basal plane orientation and,as a result,the contiguity of equiaxed α grains with basal poles in the 25°-55° range is an important parameter governing low cycle fatigue life.


Shi Y.,Tsinghua University | Wang J.,Tsinghua University | Wang Y.,Tsinghua University | Pan P.,Tsinghua University | And 2 more authors.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2014

In order to study the cyclic constitutive relationship of low-yield-point steel LYP225, 18 specimens were tested under monotonic loading and cyclic loading. The monotonic curves, hysteretic performance and failure modes were discussed. The skeleton curves were fitted under cyclic loading with the increase of the strain step by step based on the Ramberg-Osgood model. The isotropic hardening and kinematic hardening parameters were calibrated according to the test data based on the Chaboche model and input into the combined hardening model in Abaqus to verify the accuracy of the calibration. The results show that the stress-strain relationship of LYP225 is related to the loading history. LYP225 shows excellent ductility under different loading systems. The Ramberg-Osgood model can simulate the cyclic skeleton curves with the increase of the strain step by step. The finite element results can simulate the hysteretic curves of LYP225 accurately with the calibrated hardening parameters input into Abaqus. Therefore, the performance of LYP225 under cyclic loading is different from that under monotonic loading. The calibrated hardening parameters according to the test data can be used in earthquake response analysis of the overall steel structure. ©, 2014, Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition). All right reserved.


Yan H.,Tsinghua University | Pan P.,Tsinghua University | Wang Y.,Tsinghua University | Makino T.,Sumikin Kansai Industries Co. | Qi X.,Sumikin Kansai Industries Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012

This paper mainly presents an experimental research on a new type of buckling-restrained brace (BRB) which uses an in-line steel plate as the core and a double-web wide flange steel member as the outer unit. A thin rubber layer is used between the core plate and outer unit as unbonded material. Uniaxial cyclic loading tests of eight BRB specimens were conducted to investigate the energy dissipation capacity of the BRBs as well as the effects of core material and brace length on the energy dissipation capacity. The results show that the structure of this new BRB is applicable and all the hysteresis curves are stable and plump. Both core material properties and brace length have significant effects on the energy dissipation capacity of the BRBs. The specimen with SLY225 as the core material has better performance such as the energy dissipation capacity, low cycle fatigue performance and plastic deformation capacity than the one with SN490B as the core material. The former can provide an additional damping ratio of 45% which is larger than the latter. It is also found that the plastic deformation capacity and the low cycle fatigue performance degrade with the increase of the brace length.


Yan H.,Tsinghua University | Pan P.,Tsinghua University | Wang Y.,Tsinghua University | Makino T.,Sumikin Kansai Industries Co. | Qi X.,Sumikin Kansai Industries Co.
Applied Mechanics and Materials | Year: 2012

In order to reduce seismic responses of structures, low-yield point steel has been used for dampers due to its excellent energy dissipation capacity. However, few researches about the low-yield point steel dampers have been conducted in China so far. This paper mainly presents an experimental study on two buckling-restrained braces (BRBs) which take an in-line steel plate as the core and a double-web wide flange steel member as the outer unit. Low-yield point steel LY100 is taken as the core material and conventional steel SN400 is taken as the outer material. Uniaxial cyclic loading tests of two low-yield point steel BRBs (LYS-BRB) were conducted to investigate their hysteretic behavior and energy dissipation capacity. The two LYS-BRBs yielded at rather small displacement and their accumulated plastic deformation ratios reached 1639 and 1437, respectively. Significant strain-hardening behavior can be observed in the hysteresis curves of LYS-BRBs and the maximum cyclic stress reached 3.85 times the yield stress. © (2012) Trans Tech Publications.


Wang J.,Tsinghua University | Shi Y.,Tsinghua University | Yan H.,Tsinghua University | Wang Y.,Tsinghua University | And 3 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

Nowadays, the buckling-restrained braces with various forms and performances have been widely used in large-span and high-rise steel structures. To study the seismic behavior of buckling-restrained braces with low yield point, four specimens produced by a Japanese company-Sumikin Kansai Industries Co., Ltd. were tested under cyclic loading, and the corresponding load-displacement curves were recorded. Test results showed that all specimens failed due to the fatigue fracture of the stiffener weld or steel core, and hysteresis curves of all specimens were full without degradation or pinching. It is known from the analysis that such components could prevent their buckling before the yielding of steel core with the ductility of low yield point steel developed sufficiently. Under the cyclic loading, the hardening characteristics of specimens were remarkable with hardened stress as 2~4 times of initial stress. Besides, under cyclic loading, the equivalent viscous damping ratio was large so that such specimens may possess good capacities in plastic deformation and energy dissipation.


Wang J.-J.,Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry | Shi Y.-J.,Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry | Wang Y.-Q.,Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry | Pan P.,Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry | And 2 more authors.
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2015

In order to simulate the earthquake response of low yield point steel, its constitutive relationship under cyclic loading needs to be studied. Twenty specimens of low yield point steel LYP100 were tested under sixteen different loading systems. Monotonic curves, hysteretic curves, failure modes and ductility properties were analyzed. Skeleton curves under cyclic loading with strain increasing step by step were fitted based on Ramberg-Osgood model. And parameters of isotropic hardening and kinematic hardening were calibrated from test data. The calibration was then verified by finite element results simulated in ABAQUS. Results show that, LYP100 steel exhibits a large degree of cyclic hardening; LYP100 has excellent ductility even after being subjected to cyclic loading; Ramberg-Osgood model fits skeleton curves well under cyclic loading with strain increasing step by step; finite element results fit test results well when calibrated hardening parameters are input into ABAQUS. ©, 2015, Zhejiang University. All right reserved.


Hao X.-Y.,Dalian University of Technology | Li H.-N.,Dalian University of Technology | Toshio M.,Sumikin Kansai Industries CO.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

The shaking table tests of a steel structure with innovative H type steel-unbuckling-braces (SUB) and with conventional central braces were conducted to compare the dynamic characteristics and seismic responses of the structure with one of the two kinds of braces. The effect of the two braces on seismic behaviors of the structure were analysed respectively. A finite element analysis was carried out and its result was compared with the experimental result. The results of tests and calculations show that the Innovative H type Steel-Unbuckling- Brace presented provides initial stiffness as the conventional central brace and the layer displacement of the two frameworks is almost the same in normal using. But the layer displacement of the framework with H type SUB is far less than that with conventional brace under middle and strong earthquakes, because the SUB dissipates earthquake input energy before the framework enters into the stage of elastic-plastic degeneration, which will reduce the structural damage.


Hao X.-Y.,Dalian University of Technology | Li H.-N.,Dalian University of Technology | Yang C.-M.,Dalian University of Technology | Makino T.,Sumikin Kansai Industries CO.
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2012

As a new type of prospective component for energy dissipation and vibration reduction, unbuckling-brace is a composite bracing member which can act as conventional central brace without buckling and displacement type damper, and overcomes the shortcoming of buckling characteristics of conventional braces. In this paper, H type steel-unbuckling-brace (SUB) which was welded by using steel flats and core made of low yield steel was presented at first. Quasi-static tests with reciprocating loads were conducted on four steel H type unbuckling-brace specimens for testing the seismic performances. The loading process and energy dissipation mechanism of these SUB specimens were studied, moreover, seismic performances, such as force-displacement hysteretic curve, resilience model, accumulative plastic deformation and energy dissipation capability are analyzed too. At last the hysteretic curves for the specimens were simulated based on ANSYS and compared with the experimental results. The better hysteretic behavior and high energy dissipation of SUB were verified. Numerical simulation results show that the frame structure with H type steel-unbuckling-brace has good seismic absorption effect.


Hao X.-Y.,Dalian University of Technology | Li H.-N.,Dalian University of Technology | Li G.,Dalian University of Technology | Makino T.,Sumikin Kansai Industries Co.
Structural Design of Tall and Special Buildings | Year: 2014

The unbuckling brace, acting as a combination of a conventional brace and displacement-dependent damper, can successfully avoid the bucking and consequent fracture compared with the conventional brace, which has been widely applied in concentrically braced frame structures. In this paper, the H-type steel unbuckling brace (SUB), which is welded by steel flats and core made of low-yield steel, is presented. The quasi-static tests, the shaking table tests of a steel structure with SUBs and conventional central braces and the numerical analysis of a real steel building with and without SUBs are conducted in this study to evaluate the performance of SUBs. The results demonstrate that the SUBs have excellent plastic deformation capacity, stable energy dissipation capacity and no stiffness degradation, and can provide certain initial stiffness to the structure and dissipate earthquake input energy by yielding behaviour. Moreover, it is effective in reducing the structural response, and in particular, in controlling the structural displacement. In conclusion, the SUB proposed is a lateral resistant member with high stiffness and strength and an excellent energy dissipation device, which is much more competitive than the conventional brace in improving lateral resistance and seismic performance of the frame structure. © 2013 John Wiley & Sons, Ltd.

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