Numerical Prediction of Ductile Crack Initiation in a Steel Column under Cyclic Loading

2012 ◽  
Author(s):  
Makoto Obata ◽  
Hideyuki Fujiwara ◽  
Yoshiaki Goto
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Numerical Prediction ◽  
Ductile Crack ◽  
Steel Column

Application of Equivalent Damage Concept to Evaluation of Ductile Cracking for Linepipe Under Large Scale Seismic Loading

2003 ◽  
Author(s):  
Mitsuru Ohata ◽  
Masao Toyoda
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Safety Assessment ◽  
Large Scale ◽  
Seismic Loading ◽  
Steel Pipe ◽  
Small Scale ◽  
Ductile Crack ◽  
Hardening Material ◽  
Cyclic Straining

A large scale seismic loading sometimes produces local buckling in onshore or offshore linepipe and subsequent loading can lead to ductile cracking followed by ductile failure. It is important to assess the ductile crack initiation of linepipe subjected to a large scale cyclic straining induced by seismic loading for safety assessment of linepipe. This paper is mainly paid attention to the applicability of the damage concept proposed by authors for evaluation of ductile cracking of steel pipe under large scale cyclic loading. The damage concept is based on the “two-parameter criterion”, using the effective plastic strain, which is taken into account mechanical and microstructural aspects of Bauschinger effect of steel. The transferability of small scale tensile test results to the assessment of ductile crack initiation of steel pipe under seismic loading by using the effective damage concept is verified by conducting cyclic bending tests for straight pipe with initial deflection. The effective damage strain under cyclic loading, which is derived from the evolution of back stress, was calculated by FE-analysis employing a combined (isotropic/kinematic) hardening material model. It is found that the critical safety assessment of ductile crack initiation can be conducted based on the strain-based criterion in accordance with the proposed damage concept.

scholarly journals Ductile Crack Initiation Behavior of Structural Steel under Cyclic Loading

1999 ◽  
Vol 85 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Nobuyuki ISHIKAWA ◽  
Yasuo KOBAYASHI ◽  
Masayoshi KURIHARA ◽  
Koichi OSAWA ◽  
Masao TOYODA
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Structural Steel ◽  
Ductile Crack

A strain gauge method for detecting ductile crack initiation

1978 ◽  
Vol 14 (4) ◽  
pp. R199-R204 ◽  
Author(s):  
M. S. Kamath ◽  
M. J. Neaves
Keyword(s):  
Crack Initiation ◽  
Strain Gauge ◽  
Ductile Crack

Crack initiation and crack propagation under thermal cyclic loading

1990 ◽  
Vol 8 (2) ◽  
pp. 98-104 ◽  
Author(s):  
K. Bethge ◽  
D. Munz ◽  
J. Neumann
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Crack Propagation

Design of crack arrestors for ultra high grade gas transmission pipelines: simulation of crack initiation, propagation and arrest

2011 ◽  
Vol 2 (2) ◽  
pp. 307-319
Author(s):  
F. Van den Abeele ◽  
M. Di Biagio ◽  
L. Amlung
Keyword(s):  
Crack Initiation ◽  
Crack Propagation ◽  
Large Scale ◽  
Large Diameter ◽  
Pipe Material ◽  
High Grade ◽  
Gas Pipelines ◽  
Ductile Crack ◽  
Reinforced Plastics ◽  
Four Point Bending

One of the major challenges in the design of ultra high grade (X100) gas pipelines is the identification of areliable crack propagation strategy. Recent research results have shown that the newly developed highstrength and large diameter gas pipelines, when operated at severe conditions, may not be able to arrest arunning ductile crack through pipe material properties. Hence, the use of crack arrestors is required in thedesign of safe and reliable pipeline systems.A conventional crack arrestor can be a high toughness pipe insert, or a local joint with higher wall thickness.According to experimental results of full-scale burst tests, composite crack arrestors are one of the mostpromising technologies. Such crack arrestors are made of fibre reinforced plastics which provide the pipewith an additional hoop constraint. In this paper, numerical tools to simulate crack initiation, propagationand arrest in composite crack arrestors are introduced.First, the in-use behaviour of composite crack arrestors is evaluated by means of large scale tensile testsand four point bending experiments. The ability of different stress based orthotropic failure measures topredict the onset of material degradation is compared. Then, computational fracture mechanics is applied tosimulate ductile crack propagation in high pressure gas pipelines, and the corresponding crack growth inthe composite arrestor. The combination of numerical simulation and experimental research allows derivingdesign guidelines for composite crack arrestors.

Performance of parking steel column damaged by fire

2019 ◽  
Vol 10 (2) ◽  
pp. 138-154
Author(s):  
Farshid Masoumi ◽  
Ebrahim Farajpourbonab
Keyword(s):  
Cyclic Loading ◽  
Seismic Performance ◽  
Numerical Study ◽  
Mechanical Analysis ◽  
Content Type ◽  
Steel Columns ◽  
Fire Engineering ◽  
Steel Column ◽  
Concrete Coating ◽  
Fire Loading

Purpose The primary purpose of this research was to expand the knowledge base regarding the behavior of steel columns during exposure to fire. This paper presents the numerical study of the effect of heat on the performance of parking steel column in a seven-story steel building under cyclic loading. Design/methodology/approach In this research, the forces and deformations developed during a fire are estimated by using detailed 3D finite-element models. The analyses are in the form of a coupled thermo-mechanical analysis in two types of loading: concurrent loading (fire and cyclic loading) and non-concurrent loading (first fire and then cyclically), and the analyses have been conducted in both states of the fire loading with cooling and without cooling using the ABAQUS software. Further, it was investigated whether, during the fire loading, the specimen was protected by a 3-cm-thick concrete coating and how much it changes the seismic performance. After verification of the specimen with the experimental test results, the column model was investigated under different loading conditions. Findings The result of analyses indicates that the effect of thermal damage on the performance of steel columns, when cooling is happening late, is more than the state in which cooling occurs immediately after the fire. In this paper, thermal–seismic performance of parking steel columns has been specified and the effect of the fire damage has been investigated for the protected steel by concrete coating and to the non-protected steel, under both cooling and non-cooling states. Originality/value This study led to recommendations based on the findings and suggestions for additional work to support performance-based fire engineering. It is clear that predicting force and deformation on steel column during fire is complex and it is affected by many variables. Here in this paper, those variables are examined and proper results have been achieved.

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