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Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3,   Pages 369-376 doi: 10.1007/s11465-018-0489-7

Abstract: This study aims to examine the crack growth behavior of turbine disc GH4169 superalloy under creep-fatigueThe crack growth rate of GH4169 superalloy significantly increased with dwell time.In addition, testing data under the same dwell time showed scattering at the crack growth rate.growth rate.growth rate at 650 °C, thus indicating that two factors, namely, fine grain and presence of the d phase

Keywords： crack growth rate     creep-fatigue     GH4169 superalloy     CT specimen     dwell time    

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Economic Growth Model Based on Six Basic Factors of Production—Xu Growth Rate Equation

Shou-bo Xu,Zong-yuan Huang

Frontiers of Engineering Management 2014, Volume 1, Issue 2,   Pages 160-175 doi: 10.15302/J-FEM-2014024

Abstract: This paper proposes an economic growth model based on the Six Basic Factors of Production and Xu GrowthRate Equation for the first time, which fills-in the deficits of the New Classical Economic Growth Modelrelatively rocketing growth rate; in some years, the factors of production consumption rate was veryhigh, but the economy growth rate slowed down.Noticeably, since 2004, the technology contribution rate generally shows a downward trend, reasons of

Keywords： six basic factors of production     economic growth model     Xu Growth Rate Equation    

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Concurrent fatigue crack growth simulation using extended finite element method

Zizi LU, Yongming LIU,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 3,   Pages 339-347 doi: 10.1007/s11709-010-0078-2

Abstract: In this paper, a concurrent simulation framework for fatigue crack growth analysis is proposed usingscale model for fatigue mechanism analysis and the extended finite element method (X-FEM) for fatigue crackgrowth simulation.The X-FEM greatly facilitates crack growth simulation without remeshing requirements ahead of the crackgrowth analysis.

Keywords： small time scale model     extended finite element method (X-FEM)     crack growth     multiaxial    

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An investigation on prevalent strategies for XFEM-based numerical modeling of crack growth in porous

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 914-936 doi: 10.1007/s11709-021-0750-8

Abstract: Crack growth modeling has always been one of the major challenges in fracture mechanics.Finally, the crack growth is modeled in a natural porous media (Fontainebleau sandstone).identically predict the stress distribution in the sample, the first strategy simulates only the initial crackExperimental tests showed that the second strategy is a more accurate strategy in predicting the preferred crackgrowth path and determining the maximum strength of the sample.

Keywords： numerical modeling     extended finite element method     porous media     crack growth     stress intensity factor    

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Some remarks on the engineering application of the fatigue crack growth approach under nonzero mean loads

Jorge Alberto Rodriguez DURAN,Ronney Mancebo BOLOY,Rafael Raider LEONI

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 3,   Pages 255-262 doi: 10.1007/s11465-015-0342-1

Abstract:

The well-known fatigue crack growth (FCG) curves are two-parameter dependents.the mathematical representation of these curves should be integrated between the initial and final crackK is almost always selected and, in these conditions, considered as the crack driving forceNumerical examples of crack growth analysis for cracks growing under nominal stresses of constant amplitudeThe resulting curves of crack size versus number of cycles (a vs.

Keywords： fatigue crack propagation modeling     life prediction     mean stress effects    

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Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked

Xiaobo REN, Odd M. AKSELSEN, B?rd NYHUS, Zhiliang ZHANG

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 3,   Pages 217-223 doi: 10.1007/s11709-012-0169-3

Abstract: This paper focuses on the effect of welding residual stress on the ductile crack growth resistance ofThe complete Gurson model has been employed to calculate the ductile crack growth resistance.Results show that residual stresses reduce the ductile crack growth resistance.However, the effect of residual stresses on ductile crack growth resistance decreases with the increaseof crack growth.

Keywords： residual stress     ductile crack growth resistance     complete Gurson model     eigenstrain method    

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Fatigue crack growth behavior of a 170 mm diameter stainless steel straight pipe subjected to combined

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 905-913 doi: 10.1007/s11709-021-0683-2

Abstract: Higher crack growth rate occurs because of this torsional load in addition to the bending load.The experimental crack depth was measured using alternating current potential drop technique.Afterward, the fatigue crack growth and crack pattern were discussed.As a result, fatigue crack growth predicted using analytical methods are in good agreement with experimental

Keywords： life     Delale and Erdogan method     RMS–SIF approach     stainless steel     torsion and bending load     fatigue crackgrowth    

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Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

Sachin KUMAR,A. S. SHEDBALE,I. V. SINGH,B. K. MISHRA

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 420-440 doi: 10.1007/s11709-015-0305-y

Abstract: this paper, elasto-plastic XFEM simulations have been performed to evaluate the fatigue life of plane crack

Keywords： XFEM     von-Mises yield criterion     isotropic hardening     fatigue crack growth     J-integral    

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Application of the expanded distinct element method for the study of crack growth in rock-like materials

Lei YANG, Yujing JIANG, Bo LI, Shucai LI, Yang GAO

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 2,   Pages 121-131 doi: 10.1007/s11709-012-0151-0

Abstract: The expanded distinct element method (EDEM) was used to investigate the crack growth in rock-like materialsthat the EDEM model with the tensile-shear failure criterion has strong capabilities for modeling the growthResearch results demonstrated that sample failure primarily resulted from the growth of single cracksform of tensile wing cracks and shear secondary cracks) and the coalescence of two cracks due to the growthAdditionally, the inclination angle of the pre-existing crack clearly influences the final failure pattern

Keywords： expanded distinct element method (EDEM)     crack growth     rock-like material     tensile-shear failure criterion    

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Simulation of cohesive crack growth by a variable-node XFEM

Weihua FANG, Jiangfei WU, Tiantang YU, Thanh-Tung NGUYEN, Tinh Quoc BUI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 215-228 doi: 10.1007/s11709-019-0595-6

Abstract: It also allows modeling the equal stresses at both sides of the crack in the crack-tip as assumed inthe cohesive model, and is able to simulate the arbitrary crack-tip location.

Keywords： extended finite element method     cohesive zone model     sign function     crack propagation    

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Effect of seismic wave propagation in massed medium on rate-dependent anisotropic damage growth in concrete

Alireza DANESHYAR, Hamid MOHAMMADNEZHAD, Mohsen GHAEMIAN

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 346-363 doi: 10.1007/s11709-021-0694-z

Abstract: formulated to reproduce irreversible deformations and tensorial degeneration of concrete in a coupled and rate-dependent

Keywords： soil–structure interaction     massed foundation     radiation damping     anisotropic damage    

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Fatigue crack growth simulations of 3-D linear elastic cracks under thermal load by XFEM

Himanshu PATHAK,Akhilendra SINGH,I.V. SINGH,S. K. YADAV

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 359-382 doi: 10.1007/s11709-015-0304-z

Abstract: This paper deals with the fatigue crack growth simulations of three-dimensional linear elastic cracksBoth temperature and displacement approximations are extrinsically enriched by Heaviside and crack frontCrack growth is modelled by successive linear extensions, and the end points of these linear extensionsare joined by cubic spline segments to obtain a modified crack front.Different crack geometries such as planer, non-planer and arbitrary spline shape cracks are simulated

Keywords： 3-D cracks     fatigue life     Paris law     thermal load     XFEM    

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roughening transition and missing regime transition of melt crystallized polybutene-1 tetragonal phase: growth

Motoi YAMASHITA

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 2,   Pages 125-134 doi: 10.1007/s11705-009-0001-3

Abstract: The morphology and lateral growth rate of polybutene-1 ( -PB1) have been investigated for crystallizationThe nucleation and growth mechanism for crystallization does not work below 85°C, since the growth faceHowever, the growth rate shows the supercooling dependence derived from the nucleation and growth mechanismThe nucleation theory seems still to work even for rough surface growth.Possible mechanisms for the crystal growth of this polymer are discussed.

Keywords： isotactic polybutene-1     tetragonal phase (form Ⅱ)     melt crystallization     growth rate     kinetic    

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Environmental Mountain”——On the Increase and Decrease of Environment Impact in the Process of Economic Growth

Lu Zhongwu,Mao Jiansu

Strategic Study of CAE 2003, Volume 5, Issue 12,   Pages 36-42

Abstract:

The curve of environmental impact in the process of economic growth in developed countries was likenedrelationship between environmental impact and GDP were derived, in which there are 2 key variables： g—growthrate of GDP; t—decreasing rate of environmental impact per unit GDP.Taking several countries and provinces in China as examples, the relationships between economic growth

Keywords： “environmental mountain”     environmental impact     growth rate of GDP     environmental impact per unit GDP     decreasingrate of environmental impact per unit GDP    

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Comparison of growth and lipid accumulation properties of two oleaginous microalgae under different nutrient

Qiao ZHANG,Yu HONG

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 5,   Pages 703-709 doi: 10.1007/s11783-014-0649-x

Abstract: This study compared the growth and lipid accumulation properties of two oleaginous microalgae, namelyIn summary, low-nutrient conditions favour the growth and lipid production of both algae, but sp.

Keywords： HQ     growth rate     algal biomass     lipid accumulation     triacylglycerols (TAGs)    

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Title Author Date Type Operation

Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

Journal Article

Economic Growth Model Based on Six Basic Factors of Production—Xu Growth Rate Equation

Shou-bo Xu,Zong-yuan Huang

Journal Article

Concurrent fatigue crack growth simulation using extended finite element method

Zizi LU, Yongming LIU,

Journal Article

An investigation on prevalent strategies for XFEM-based numerical modeling of crack growth in porous

Journal Article

Some remarks on the engineering application of the fatigue crack growth approach under nonzero mean loads

Jorge Alberto Rodriguez DURAN,Ronney Mancebo BOLOY,Rafael Raider LEONI

Journal Article

Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked

Xiaobo REN, Odd M. AKSELSEN, B?rd NYHUS, Zhiliang ZHANG

Journal Article

Fatigue crack growth behavior of a 170 mm diameter stainless steel straight pipe subjected to combined

Journal Article

Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

Sachin KUMAR,A. S. SHEDBALE,I. V. SINGH,B. K. MISHRA

Journal Article

Application of the expanded distinct element method for the study of crack growth in rock-like materials

Lei YANG, Yujing JIANG, Bo LI, Shucai LI, Yang GAO

Journal Article

Simulation of cohesive crack growth by a variable-node XFEM

Weihua FANG, Jiangfei WU, Tiantang YU, Thanh-Tung NGUYEN, Tinh Quoc BUI

Journal Article

Effect of seismic wave propagation in massed medium on rate-dependent anisotropic damage growth in concrete

Alireza DANESHYAR, Hamid MOHAMMADNEZHAD, Mohsen GHAEMIAN

Journal Article

Fatigue crack growth simulations of 3-D linear elastic cracks under thermal load by XFEM

Himanshu PATHAK,Akhilendra SINGH,I.V. SINGH,S. K. YADAV

Journal Article

roughening transition and missing regime transition of melt crystallized polybutene-1 tetragonal phase: growth

Motoi YAMASHITA

Journal Article

Environmental Mountain”——On the Increase and Decrease of Environment Impact in the Process of Economic Growth

Lu Zhongwu,Mao Jiansu

Journal Article

Comparison of growth and lipid accumulation properties of two oleaginous microalgae under different nutrient

Qiao ZHANG,Yu HONG

Journal Article