scholarly journals EXTREMELY LOW CYCLE FATIGUE ASSESSMENT FOR WELDED JOINTS BASED ON PEAK STRAIN APPROACH

2006 ◽  
Vol 62 (1) ◽  
pp. 101-109
Author(s):  
Takeshi HANJI ◽  
Kazuo TATEISHI ◽  
Kuniaki MINAMI ◽  
Kazuya KITOH
Keyword(s):  
Welded Joints ◽  
Low Cycle Fatigue ◽  
Peak Strain ◽  
Cycle Fatigue ◽  
Fatigue Assessment

Development of a Model for Low-Cycle Fatigue Assessment of 347 SS Butt-Welded Joints

2013 ◽  
Author(s):  
Eliane Lang ◽  
Jürgen Rudolph ◽  
Heinz Thomas Beier ◽  
Michael Vormwald
Keyword(s):  
Welded Joints ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Cycle Fatigue ◽  
Detailed Model ◽  
Butt Weld ◽  
New Approach ◽  
Fatigue Assessment ◽  
3D Scans

This contribution deals with the low cycle fatigue behavior of butt-welded joints of austenitic stainless steel (1.4550, type 347). The focus is on the problem how to model these welded joints adequately with the objective of its assessment. Thereby, the differences between as-welded and machined weld are considered, in addition. The considerations — presented here — are based on previous investigations reported by Lang et al. [10]. Therein, a new approach was proposed in order to determine the local strains and the LCF relevant influence of the butt weld. It is based on material mechanics and includes an accurate modeling of the real weld geometry — based on 3D scans with very high resolution. Originating from this detailed model an idealized model is derived that takes into account significant parameters of a butt weld. In addition, the inhomogeneity of the weld is considered in the model, now, that has previously been ignored. Therefore, the part around the weld was partitioned in material zones according to their hardness. The underlying hardness measurements revealed significant influences of the load history. The results of the numerical simulations based on the new model are compared to them of the scan-based model and the measuring results from related fatigue tests. Considering further fatigue influences as the size and surface roughness the new approach is intended to be adopted in a global design and calculation concept for low-cycle fatigue assessment of butt-welded joints — applicable for normal users.

scholarly journals Low-cycle fatigue behaviour of laser welded high-strength steel DOMEX 700 MC

2018 ◽  
Vol 157 ◽  
pp. 05013 ◽  
Author(s):  
Peter Kopas ◽  
Milan Sága ◽  
František Nový ◽  
Bohuš Leitner
Keyword(s):  
Fatigue Life ◽  
Welded Joints ◽  
High Strength Steel ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
High Strength ◽  
Fatigue Behaviour ◽  
Total Strain Amplitude ◽  
Cycle Fatigue ◽  
Fatigue Life Analysis

The article presents the results of research on low cycle fatigue strength of laser welded joints vs. non-welded material of high-strength steel DOMEX 700 MC. The tests were performed under load controlled using the total strain amplitude ɛac. The operating principle of the special electro-mechanic fatigue testing equipment with a suitable clamping system was working on 35 Hz frequency. Fatigue life analysis was conducted based on the Manson-Coffin-Basquin equation, which made it possible to determine fatigue parameters. Studies have shown differences in the fatigue life of original specimens and laser welded joints analysed, where laser welded joints showed lower fatigue resistance. In this article a numerical analysis of stresses generated in bending fatigue specimens has been performed employing the commercially available FEM-program ADINA.

Investigation of low-cycle fatigue of welded joints in light alloys

1972 ◽  
Vol 4 (11) ◽  
pp. 1320-1322
Author(s):  
V. A. Strizhalo ◽  
A. A. Il'in ◽  
Yu. A. Kuzema
Keyword(s):  
Welded Joints ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Light Alloys

Low Cycle Fatigue Analysis of Marine Structures

2006 ◽  
Author(s):  
Xiaozhi Wang ◽  
Joong-Kyoo Kang ◽  
Yooil Kim ◽  
Paul H. Wirsching
Keyword(s):  
Welded Joints ◽  
Low Cycle Fatigue ◽  
Prediction Method ◽  
Local Stress ◽  
Cyclic Plasticity ◽  
Cycle Fatigue ◽  
Stress Concentrations ◽  
Damage Prediction ◽  
Marine Structure ◽  
Number Of Cycles

There are situations where a marine structure is subjected to stress cycles of such large magnitude that small, but significant, parts of the structural component in question experiences cyclic plasticity. Welded joints are particularly vulnerable because of high local stress concentrations. Fatigue caused by oscillating strain in the plastic range is called “low cycle fatigue”. Cycles to failure are typically below 104. Traditional welded joint S-N curves do not describe the fatigue strength in the low cycle region (< 104 number of cycles). Typical Class Society Rules do not directly address the low cycle fatigue problem. It is therefore the objective of this paper to present a credible fatigue damage prediction method of welded joints in the low cycle fatigue regime.

scholarly journals The evolution of the welded joints structure at low cycle fatigue

2017 ◽  
Vol 129 ◽  
pp. 02045
Author(s):  
Ekaterina Poyarkova ◽  
Iskander Kuzeev
Keyword(s):  
Welded Joints ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue

scholarly journals On the Low Cycle Fatigue Behavior in the Longitudinally Butt Welded Joints between High Strength Steel and Mild Steel

1977 ◽  
Vol 1977 (142) ◽  
pp. 236-244
Author(s):  
Kinichi Nagai ◽  
Mitsumasa Iwata ◽  
Kenhichiro Kurihara ◽  
Junkichi Yagi ◽  
Yasumitsu Tomita
Keyword(s):  
Mild Steel ◽  
Welded Joints ◽  
High Strength Steel ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
High Strength ◽  
Cycle Fatigue
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