Faculty Profiles - TATEISHI Kazuo

Papers - TATEISHI Kazuo

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Low cycle fatigue assessment for welded joints based on local strain approach

Kazuo Tateishi, Takeshi Hanji, Tao Chen

The 60th Annual Assembly of International Institute of Welding page： XIII-2160-07 2007.6

A study on strain behavior of thick walled steel pier under seismic action for low cycle fatigue assessment

Kazuo Tateishi,Tao Chen

Vol. VOL.6 page： CD-ROM 2007.6

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

For low cycle fatigue assessment, strain behavior in steel member should be sccurately estimated. An investigation on local strain behavior of steel pier excited by strong ground motion due to earthquake is presented here. Average strains in effective failure length of the pier are obtained by nonlinear dynamic analysis, and then they can be converted to local strain range by a relationship proposed for thick walled steel piers. Parametric studies with various accelerograms and geometry configurations of the member are conducted. Based on local strain range estimated by the method, fatigue damage index is finally calculated and discussed.

A Prediction Model for Extremely Low Cycle Fatigue Strength of Structural Steel Reviewed

Kazuo Tateishi,Takeshi Hanji,Kuniaki Minami

International Journal of Fatigue Vol. 29 ( 5 ) page： 887-896 2007.5

Language：English Publishing type：Research paper (scientific journal)

Miner's rule has been accepted as a simple and effective method for predicting the low cycle fatigue life under variable strain amplitude. However, in an extremely large strain field, corresponding to the fatigue life of less than 10 cycles, the accuracy of Miner's rule has not been verified. In this study, low cycle fatigue tests under variable strain amplitude in an extremely large strain field were conducted with a newly developed testing system. Miner's rule always predicted a longer fatigue life than the observed life. A simple model introducing the damage mechanics concept was proposed and its validity was examined as another method for predicting low cycle fatigue
life.

Low Cycle Fatigue Assessment of T Shaped Welded Joint by Local Strain Based Approach Reviewed

Tao Chen,Kazuo Tateishi

Proc. of 8th Pacific Structural Steel Conference page： 159-164 2007.3

Language：English

Several T-shaped welded joint models are analyzed by finite element (FE) method for low cycle fatigue assessment in this paper. Joint is subjected to random loading blocks and strain history is counted by rainflow counting method. Endeavor is exerted to correlate local strain range of coarse FE model that ignores weld toe profile with strain range obtained by fine FE model that simulates the weld toe profile. Other parameters such as main geometrical dimensions and material properties are also taken into account. After that, strain range relationship is established. Numerical results show that weld toe radius is the most influential factor while others' effects are insignificant. At last, proposed approach is introduced to the analysis of T shaped welded joint test. It turns out simple and convenient in low cycle fatigue assessment since cumbersome modeling of weld local profile becomes not necessary.

Extremely Low Cycle Fatigue Assessment of Thick Walled Steel Pier Using Local Strain Approach Reviewed

Tao Chen,Kazuo Tateishi

Journal of Structural Engineering, JSCE Vol. 53A page： 485-492 2007.3

Language：English Publishing type：Research paper (scientific journal)

In this paper, several un-stiffened thick walled steel piers were analyzed to investigate high local strain in welded joints that triggered extremely low cycle fatigue failure. The local strain range at weld toe was correlated with the nominal strain range in effective failure length obtained by beam model analysis. Based on the local strain estimated by the nominal strain with the correlation, extremely low cycle fatigue assessment was carried out. It was shown that the local strain approach based on beam model analysis gave a safe side fatigue assessment result.

A New Local Strain Based Approach to Low Cycle Fatigue Assessment of Welded Joint Reviewed

Kazuo Tateishi,Tao Chen,Takeshi Hanji

Steel Construction Engineering, JSSC Vol. 13 ( 52 ) page： 73-81 2006.12

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

Several T-shaped welded joint models are analyzed by finite element5 method for history is counted by range pair-range counting method. Endeavor is exerted to correlate local strain range of coarse FE model that ignores the weld toe profile with strain range obtained by fine material properties and loading pattern are also taken into account. After that, strain range factor while others' effects are insignificant. At last, proposed approach is introduced to the analysis of T shaped welded joint test. It turns out simple and convenient in low cycle fatigue assessment since cumbersome modeling of weld local profile becomes not necessary.

疲労設計の方向

舘石和雄

橋梁と基礎 Vol. 40 ( 8 ) page： 33-35 2006.8

Improvement of extremely low cycle fatigue strength of welded joints by TIG dressing Reviewed

Takeshi Hanji, Kazuo Tateishi, Kazuya Kitoh, Kuniaki Minami

Steel Construction Engineering, JSSC Vol. 13 ( 50 ) page： 27-34 2006.6

鋼構造物におけるき裂検査の現状と課題

森猛，舘石和雄

安全工学シンポジウム2006 page： 41-52 2006.6

局部加熱を併用した硬化剤注入手法による鋼材の疲労き裂進展抑制 Reviewed

舘石和雄，北河一喜，稲葉尚文，冨田芳男

土木学会論文集A Vol. 62 ( 1 ) page： 126-131 2006.1

Extremely low Cycle Fatigue Assessment for Welded Joints Based on Peak Strain Approach Reviewed

Kazuo Tateishi,Takeshi Hanji,Kuniaki Minami,Kazuya Kitoh

Vol. 62 ( 1 ) page： 101-109 2006.1

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

As an estimation method of low cycle fatigue strength of welded joint in extremely large strain field, fatigue assessment method based on peak strain approach was verified. T-shape welded joints were employed for the low cycle fatigue test. The local strain field around welded portion and the peak strain at the cracked point was analyzed by elasto-plastic finite element method. The relationship between the peak strain and the fatigue life was consistent with the fatigue strength curve proposed by the authors. Consequently, it was demonstrated the fatigue assessment method based on peak strain approach was available even in extremely large strain region.

A prediction model for extremely low cycle fatigue life under variable strain amplitude

Kazuo Tateishi, Takeshi Hanji

Proc. of the 8th Japan-Korea Joint Seminar on Steel Bridges page： 251-257 2005.8

Extremely low cycle fatigue assessment method for welded joint by peak strain approach

Takeshi Hanji, Kazuo Tateishi, Kazuya Kitoh

Proc. of the 6th Japanese-German Bridge Symposium page： CD-ROM 2005.8

Improvement of extremely low cycle fatigue strength of welded joints by TIG dressing

Kazuo Tateishi, Takeshi Hanji, Kazuya Kitoh

Proc. of the 6th Japanese-German Bridge Symposium page： CD-ROM 2005.8

Low cycle fatigue testing system by means of image technique and its application to steel welded joints

Takeshi Hanji, Kazuo Tateishi

Proc. of the 1st International Conference on Advances in Experimental Structural Engineering page： 603-609 2005.7

Surface Measurement of Corroded Steel Plate by Digita Stereo-Graphy Reviewed

Kazuo Tateishi,Kengo Shibata,Takeshi Hanji

Steel Construction Engineering, JSSC Vol. 12 ( 46 ) page： 27-34 2005.6

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

Surface profile of structural members sometimes gives valuable information to estimate mechanical behavior of existing structures. In this study, based on stereography technique, a simple method to measure the surface profile was developed, and apllied to a corroded steel plate surface. The method gave good results even for corroded steel plate surface which has few image patters and characteristics. The accuracy of the method was also discussed on the results for a variety of system conditions, such as camera position and camera resolution.

A Prediction Model for Extremely Low Cycle Fatigue Strength of Welded Joints Reviewed

Kazuo Tateishi,Takeshi Hanji, Kazuya Kitoh,Kuniaki Minami

Journal of Structural Engineering, JSCE Vol. 51A page： 1275-1282 2005.3

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

We investigated the low cycle fatigue strength of welded materials under constant and variable strain amplitude in extremely large strain region. The test results indicated that fatigue strength of welded materials, particularly heat-affected zone(HAZ),was much lower than that of plain material. We then developed a model to predict the extremely low cycle fatigue strength of welded materials Fatigue life estimated by this model was well agreed with test results.

Low cycle fatigue strength of butt- welded steel joint by means of new testing system with image technique Reviewed

Kazuo Tateishi,Takeshi Hanji

International Journal of Fatigue Vol. 26 ( 12 ) page： 1349-1356 2004.12

Language：English Publishing type：Research paper (scientific journal)

In this study, we investigated the low cycle fatigue strength of welded joints using a new fatigue testing system in which the image analysis technique was used to measure the strains in specimens. After checking the validity of the testing system, we used this new system to conduct fatigue tests on welded joint specimens. The test results indicate that the fatigue strength of welded material (weld deposit and heat affected zone) is much lower than that of the plain material.

A Prediction Model for Extremely Low Cycle Fatigue Life under Variable Strain Amplitude Reviewed

Kazuo Tateishi,Takeshi Hanji,Kuniaki Minami

J. of Structural Mechanics and Earthquake Engineering, JSCE Vol. I-69 ( 773 ) page： 149-158 2004.10

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

For predicting the low cycle fatigue life under variable strain amplitude,Miner's rule has been accepted as a simple and effective idea.
In extreme large strain field corresponding to the fatigue life of less than ten cycles,however,the accuracy of Miner's rule has not been verified yet.In this study,by means of a newly developed testing system,low cycle fatigue tests under variable strain amplitude in extreme large strain fierd was conducted.The test results showed Miner's rule always predicted longer fatigue life than actual life.As another idea for predicting low cycle fatigue life,we proposed model introducing the damage mechanics concept and examined its validity.

Low Cycle Fatigue Strength of Steel in Extreme Large Strain Field

Kazuo Tateishi,Takeshi Hanji

Proc.of The 3rd International Conference on Earthquake Engineering page： 561-565 2004.10

Language：English

Extensive experiments on the low cycle fatigue for plain steel material have been conducted and obtained some important results. There are few studies, however, on the low cycle fatigue the extreme large strain field, corresponding to the fatigue life less than ten cycles. In this study, we developed a new low cycle fatigue testing system, in which a specimen was subjected to bending deformation and the strain in the specimen was measured by image analysis technique. Low cycle fatigue test results, an estimation method for low cycle fatigue strength in the extreme large strain field was proposed.

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