TEMPERATURE DEPENDENT FRACTURE MODEL AND ITS APPLICATION TO ULTRA HEAVY THICK STEEL PLATE USED FOR SHIPBUILDING

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5483-5488 ◽  
Author(s):  
YUN CHAN JANG ◽  
YOUNGSEOG LEE ◽  
GYU BAEK AN ◽  
JOON SIK PARK ◽  
JONG BONG LEE ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Steel Plate ◽  
Three Dimensional ◽  
Propagation Direction ◽  
Steel Plates ◽  
Temperature Dependent ◽  
Numerical Studies ◽  
Crack Propagation Direction ◽  
Thick Steel ◽  
Crack Initiation Criterion

In this study, experimental and numerical studies were performed to examine the effects of thickness of steel plate on the arrest fracture toughness. The ESSO tests were performed with the steel plates having temperature gradient along the crack propagation direction. A temperature dependent crack initiation criterion was proposed as well. A series of three-dimensional FEA was then carried out to simulate the ESSO test while the thickness of the steel plate varies. Results reveal that a temperature dependent brittle criterion proposed in this study can describe the fracture behavior properly.

Crack Arresting With Crack Deflecting Holes in Steel Plates

2020 ◽  
Author(s):  
Mostafa Atteya ◽  
Ove Mikkelsen ◽  
Dimitrios G. Pavlou ◽  
Gerhard Ersdal
Keyword(s):  
Crack Propagation ◽  
Experimental Work ◽  
High Cycle Fatigue ◽  
Experimental Studies ◽  
Propagation Direction ◽  
Steel Plates ◽  
Cycle Fatigue ◽  
Numerical Studies ◽  
Crack Propagation Direction ◽  
Good Agreement

Abstract Experimental and numerical studies of the effect of crack deflecting holes in steel plates under high cycle fatigue are presented in this paper. The experimental studies show that with the careful location of the holes, crack propagation can be arrested. A numerical model is provided and validated against the experimental work. The numerically predicted crack propagation direction and crack growth rate were in good agreement with the crack propagation obtained in the experimental work.

Fracture Toughness of Thick Steel Plates for Shipbuilding

2008 ◽  
Vol 580-582 ◽  
pp. 89-92
Author(s):  
Joon Sik Park ◽  
B.Y. Jung ◽  
Hiroshi Yajima ◽  
Jong Bong Lee
Keyword(s):  
Fracture Toughness ◽  
Crack Initiation ◽  
Large Scale ◽  
Steel Plate ◽  
Plate Thickness ◽  
Steel Plates ◽  
Initiation And Propagation ◽  
Thick Steel ◽  
Test Result ◽  
Grade Steel

In this study, the effect of thickness on the fracture toughness of the steel plate with the thickness of 80mm has been investigated by the wide plate tensile test and ESSO test. The fracture toughness for crack initiation and propagation was evaluated quantitatively for the full thickness specimen. It was found that EH-36 grade steel with the thickness of 80mmt showed the KIC value of 164kgf/mm1.5 at -145°C. Also, large-scale ESSO test result showed that the steel with the thickness of 80mm had 520kgf/mm1.5 at -10°C. Although it was known that the fracture toughness decreases with the increase of the plate thickness, EH-36 grade steel with the thickness of 80mm had enough values of fracture toughness to prevent the crack initiation and arrest the brittle crack propagation.

Crack Propagation Analysis Procedure Using FEM Applied to the Three-Dimensional Stress Field

2005 ◽  
Author(s):  
Yukihiko Okuda ◽  
Yuuji Saito ◽  
Masayuki Asano ◽  
Masakazu Jimbo ◽  
Hiroshi Hirayama ◽  
...  
Keyword(s):  
Stress Field ◽  
Crack Propagation ◽  
Three Dimensional ◽  
Tensile Load ◽  
Analysis Procedure ◽  
Propagation Direction ◽  
Crack Shape ◽  
Weld Joints ◽  
Crack Propagation Direction ◽  
Propagation Analysis

Recently, several cracks have been found on the weld joints of Boiling Water Reactor (BWR) core shrouds during inspection. In order to ensure the continuous operation of nuclear power plants, it is necessary to assess the structural integrity of core shrouds with cracks on the weld joints. In general, a crack propagates in a complicated manner according to three-dimensional stress field and it is difficult to predict crack propagation direction and crack shape change. Usually, half ellipsoid crack shape is assumed and the propagation of the crack is calculated in the constant direction for assessment. In this study, crack propagation analysis procedure using the Finite Element Method (FEM) is developed for general shaped crack, and the procedure is verified by experiments. In this procedure, it is assumed that the crack propagates according to the maximum J-integral under three-dimensional stress fields and the re-mesh technique is used in the FEM analysis in order to calculate crack shape variation during propagation. The fatigue crack propagation tests under cyclic tensile load were performed to verify the analysis procedure. The specimens are made of a plate from 316SS and designed to generate non-uniform stress distribution on the crack front in order to observe continuous crack propagation direction change.

The Effect of Welding Residual Stress Distribution in Thickness Direction With Thick Steel Plate to Identification of Fracture Toughness

2016 ◽  
Author(s):  
Gyubaek An ◽  
Wanchuck Woo ◽  
Jeongung Park
Keyword(s):  
Residual Stress ◽  
Crack Propagation ◽  
Steel Plate ◽  
Welding Process ◽  
Welding Residual Stress ◽  
Steel Plates ◽  
Propagation Path ◽  
Crack Propagation Path ◽  
Flux Cored Arc Welding ◽  
Thick Steel

Along with the rapid increase in the size of welding structures, the steel plate used for structure has been increased in thickness. Especially, the growing capacity of large scale ships such as container ships has led to an increase in the thickness and the strength of steel plates for shipbuilding. The toughness and the resistance to brittle fractures of the steel plate tend to decrease for thick plates, which is a result of the so-called thickness effect. Steel plates with 80mm thickness were used and two welding processes, which are flux cored arc welding (FCAW) process and electron gas welding process (EGW), were used to produce full thickness weld joints. To evaluate of brittle crack propagation path, measurement of welding residual stress in both welded joint. In this study, it was aimed to investigate the effect of welding variables on the crack arrest toughness and crack propagation path of thick steel plate welds. Quantitative analysis by temperature gradient ESSO test was conducted to clarify the effect of welding variables for flux cored arc welding (FCAW) and electro gas welding (EGW) joint of thick steel plates with the thickness of 50 and 80mm. Also, welding residual stress was measured for evaluate of welding residual stress effect in both welding process in brittle crack propagation path using neutron science analysis.

scholarly journals Finite Element Simulation Research on Medium Plate Multi-Pass Welding Temperature Field

2015 ◽  
Vol 9 (1) ◽  
pp. 786-790
Author(s):  
Huawei Liu ◽  
Linxin Niu
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Heat Source ◽  
Steel Plate ◽  
Three Dimensional ◽  
Steel Plates ◽  
Element Analysis ◽  
Welding Temperature ◽  
Welding Arc ◽  
Input Position

V-grooved steel plate 30mm in thickness has been taken into consideration to research on the distribution of temperature field for the multi-pass welding of steel plate with intermediate thickness in the whole process of welding and cooling. With the establishment of a reasonable three-dimensional solid model, the utility of ANSYS software for finite element analysis, the usage of birth-death elements and the setting of normal Gauss heat source, steps have been undertaken to achieve the goal that the process of multi-pass welding about steel plate in intermediate thickness is simulated and the law of distribution about welding temperature field is obtained. The research results indicate the following: the temperature in every point of base metal changes constantly when the steel plate 30mm in thickness is being welded, the heat input position and position behind heat source are the integral parts which have the highest temperature during the process that welded joints are welded, the temperature gradient in front of welding arc is pretty large as well as that behind welding arc is relatively small. The calculation results are consistent with actual observations providing exactly reliable references for stress field of the welding on steel plates.

scholarly journals Simulation of Multipass Welding With Simultaneous Computation of Material Properties

2000 ◽  
Vol 123 (1) ◽  
pp. 106-111 ◽  
Author(s):  
Lars Bo¨rjesson ◽  
Lars-Erik Lindgren
Keyword(s):  
Residual Stresses ◽  
Microstructure Evolution ◽  
Material Properties ◽  
Base Material ◽  
Steel Plates ◽  
Filler Material ◽  
Temperature History ◽  
Temperature Dependent ◽  
Butt Welding ◽  
Thick Steel

Multipass butt welding of two 0.2 m thick steel plates has been investigated. The objective is to calculate residual stresses and compare them with measured residual stresses. The material properties depend on temperature and temperature history. This dependency is accounted for by computing the microstructure evolution and using this information for computing material properties. This is done by assigning temperature dependent material properties to each phase and applying mixture rules to predict macro material properties. Two different materials have been used for the microstructure calculation, one for the base material and one for the filler material.

Experiment Research on Impact of Total Rolling Reduction Ratio on the Properties of Vacuum Rolling-Bonding Ultra-Thick Steel Plate

2011 ◽  
Vol 299-300 ◽  
pp. 962-965 ◽  
Author(s):  
Guang Lei Wang ◽  
Zong An Luo ◽  
Guang Ming Xie ◽  
Kun Zhao
Keyword(s):  
Steel Plate ◽  
Testing Machine ◽  
Reduction Ratio ◽  
Steel Plates ◽  
Reaction Products ◽  
Total Reduction ◽  
Continuous Casting Slab ◽  
Universal Testing ◽  
Thick Steel ◽  
Rolling Bonding

Method of vacuum rolling-bonding can be used to produce ultra-thick steel plate over 100mm with continuous casting slab. In this paper, four groups steel plates have been rolled with 10%, 30%, 50% and 70% total reduction ratio respectively. The microstructure of the interface has been analyzed by optical and scanning electron microscopy (SEM). The reaction products formed at the interface have been identified by EDAX. It has been observed that the size and the amount of the reaction products decreased with the increase of the total reduction ratio. The tensile property of the thickness direction has been tested by the universal testing machine. The results indicated that, with the increase of the total reduction ratio, the strength had been increasing from 532MPa to 564MPa, and the plate plasticity became well.

Numerical Simulation about Reinforced Concrete Beams Strengthened by Bolting Steel Plates

2012 ◽  
Vol 166-169 ◽  
pp. 1807-1810
Author(s):  
Xue Song Gao ◽  
Dong Hui Huo ◽  
Shao Hua Lv ◽  
Xu Zhao
Keyword(s):  
Reinforced Concrete ◽  
Steel Plate ◽  
Concrete Beams ◽  
Three Dimensional ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Steel Plates ◽  
Anchor Bolt ◽  
Beam Surface ◽  
Strengthened Beam

This paper presents a three-dimensional nonlinear finite elemental analysis about the reinforcement concrete beams strengthened by bolting steel plate. The contact effects between the steel plate with reinforced concrete beam surface was simulated by developing the contact elements. The effect of strengthening is analyzed and the effects of the deformation and stress distribution of anchor bolt on the failure mode were investigated. It is declared that this strengthening method can obviously improve the capacity and stiffness of beam, and the flexural deformation of anchor bolt is key problem inducing the failure of strengthened beam. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

Numerical Simulation of the Severe Cold Bending of Thick Steel Plates

1992 ◽  
Vol 114 (2) ◽  
pp. 246-248
Author(s):  
K. A. Soudki ◽  
M. Sansalone ◽  
A. R. Ingraffea ◽  
H. Vossoughi
Keyword(s):  
Finite Element ◽  
High Strength ◽  
Material Model ◽  
Steel Plates ◽  
Isotropic Hardening ◽  
Surface Conditions ◽  
Numerical Studies ◽  
Cold Bending ◽  
Dimensional Finite Element ◽  
Thick Steel

This paper presents results of a finite element study of the severe cold bending of thick, high-strength steel plates using an explicit, two-dimensional, finite element code. A parametric study was performed to study the effect of contact surface conditions and the plate’s material model on the behavior of the plate during cold bending. The results of these numerical studies were compared with experimental data measured by Weng in 1984 and analytical equations proposed by Dat in 1980. It was found that the model with isotropic hardening and no friction showed the best agreement with the experimental and analytical results.

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