scholarly journals Strain Model and Experimental Study of Elastic Viscoplastic for Crack-tip Zone of X80 Steel Pipe

2021 ◽  
Author(s):  
Dong Shaohua ◽  
Feng Li ◽  
Peng Donghua ◽  
Hang Zhang ◽  
Guo Shiwen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Crack Tip ◽  
Steel Pipe ◽  
X80 Steel ◽  
Strain Model

Strain-based fracture response of X80 steel pipe welded girth based on constraint-modified J-R curves: from SENT specimen to full-scale pipe

2021 ◽  
pp. 108114
Author(s):  
Ziwei Li ◽  
Baoming Gong ◽  
Giuseppe Lacidogna ◽  
Caiyan Deng ◽  
Dongpo Wang
Keyword(s):  
Full Scale ◽  
Steel Pipe ◽  
X80 Steel

EXPERIMENTAL STUDY ON USE OF FALL PREVENTION MEMBERS IN WALL AND COLUMN DEMOLITION

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Seiji Takanashi ◽  
Hiroki Takahashi ◽  
Tomohito Hori
Keyword(s):  
Experimental Study ◽  
Fall Prevention ◽  
Urban Areas ◽  
Steel Pipe ◽  
Small Scale ◽  
Bottom Part ◽  
Steel Pipes ◽  
Wire Ropes ◽  
Heavy Machinery ◽  
Measured Load

At demolition sites in Japan, columns and walls are pulled down and demolished by heavy machinery or wire ropes. In a small-scale building in urban areas, columns and walls are pulled down by wire ropes. Before pulling down, workers damage the bottom part of the columns and walls for weakening them. However, if the damage of the columns and walls are too much, they fall down before use of wire ropes. As a result, they may crush workers. In this study, a fall prevention material was proposed with its installation method and verified its effectiveness by experiments. In an experiment of this study, steel pipes for supporting 3m-column were examined. The steel pipes were installed diagonally to the column. The column was loaded horizontally. We measured load and deformation until the steel pipe failed. As a result of experiments, it was found that the steel pipe buckled or the bolt supporting the steel pipe damaged. We concluded that this method is effective because the steel pipes were found to be sufficiently strong against the load generated in the steel pipes when the columns fell.

Arc welding of annular seams under flux in high-strength X80 steel pipe

2011 ◽  
Vol 41 (11) ◽  
pp. 883-890
Author(s):  
M. Hamada ◽  
H. Shitamoto ◽  
S. Okaguchi ◽  
H. Igari ◽  
N. Takahashi ◽  
...  
Keyword(s):  
Arc Welding ◽  
High Strength ◽  
Steel Pipe ◽  
X80 Steel

The influence of fiber-crack angle on the crack tip parameters in orthotropic materials

2016 ◽  
Vol 231 (3) ◽  
pp. 418-431 ◽  
Author(s):  
M Fakoor ◽  
R Rafiee ◽  
M Sheikhansari
Keyword(s):  
Experimental Study ◽  
Structural Design ◽  
Critical Angle ◽  
Design Procedure ◽  
Crack Tip ◽  
Maximum Load ◽  
Orthotropic Materials ◽  
Fiber Direction ◽  
Catastrophic Failure ◽  
Crack Angle

Identification of the critical angle between fiber and crack direction in orthotropic materials for avoiding catastrophic failure is necessary. Recognition of the optimum regions for creating notches in orthotropic materials for creation of maximum load-bearing capability is an important parameter in structural design. In this paper, the critical angles between crack and fiber direction are predicted, extracting crack tip parameters in orthotropic materials using stress series expansion and numerical method. The variations of crack tip parameters with respect to the angle between crack and fiber for modes I and II are presented. The presented functions for these variations can be used in the optimum design procedure of orthotropic structures. The obtained results are validated using experimental study.

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