Multiaxial Cycle Deformation and Low-Cycle Fatigue Behavior of Mild Carbon Steel and Related Welded-Metal Specimen

Qu, Weilian; Zhao, Er Nian; Zhou, Qiang

doi:10.1155/2017/8987376

Cited by 6 publications

(4 citation statements)

References 21 publications

(28 reference statements)

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“…The stabilized cycle stress‐strain relationship can be fitted by using the following type of Ramberg‐Osgood model as:

\frac{normalΔ ε}{2} = \frac{normalΔ ε_{e}}{2} + \frac{normalΔ ε_{p}}{2} = \frac{normalΔ σ}{2 E} + {(\frac{normalΔ σ}{2 K^{'}})}^{\frac{1}{n^{'}}} .

…”

Section: Resultsmentioning

confidence: 99%

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Multiaxial low‐cycle fatigue life evaluation under different non‐proportional loading paths

Zhao

Zhou

et al. 2017

Fatigue Fract Eng Mat Struct

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This paper presents analytical and experimental investigations for fatigue lives of structures under uniaxial, torsional, multiaxial proportional, and non‐proportional loading conditions. It is known that the rotation of principal stress/strain axes and material additional hardening due to non‐proportionality of cycle loading are the 2 main causes resulting in shorter fatigue lives compared with those under proportional loading. This paper treats these 2 causes as independent factors influencing multiaxial fatigue damage and proposes a new non‐proportional influencing parameter to consider their combined effects on the fatigue lives of structures. A critical plane model for multiaxial fatigue lives prediction is also proposed by using the proposed non‐proportional influencing factor to modify the Fatemi‐Socie model. The comparison between experiment results and theoretical evaluation shows that the proposed model can effectively predict the fatigue life due to multiaxial non‐proportional loading.

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“…The stabilized cycle stress‐strain relationship can be fitted by using the following type of Ramberg‐Osgood model as:

\frac{normalΔ ε}{2} = \frac{normalΔ ε_{e}}{2} + \frac{normalΔ ε_{p}}{2} = \frac{normalΔ σ}{2 E} + {(\frac{normalΔ σ}{2 K^{'}})}^{\frac{1}{n^{'}}} .

…”

Section: Resultsmentioning

confidence: 99%

“…The stabilized cycle stress-strain relationship can be fitted by using the following type of Ramberg-Osgood model as 35,36 :…”

Section: Resultsmentioning

confidence: 99%

Multiaxial low‐cycle fatigue life evaluation under different non‐proportional loading paths

Zhao

Zhou

et al. 2017

Fatigue Fract Eng Mat Struct

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show abstract

“…The welding wire of MG70S-6 with a diameter of 2 mm is used. The manufacture of the welded metal specimen is followed by [23,24]. A well-designed notch is first machined at the center of the base metal bar, and the notch is then filled with weld metal.…”

Section: Specimens and Loading Pathmentioning

confidence: 99%

“…where is fatigue crack initiation life, which is obtained by fatigue tests. Since it hardly captures the instant when the cracks occur, usually is assumed as the number of cycles at which a 30% drop from the maximum values occurred in either tensile or shear stress [23]. , , , and are the fatigue strength coefficient, the fatigue ductility coefficient, the fatigue strength exponent, and the fatigue ductility exponent, respectively.…”

Section: Multiaxial Low-cycle Fatigue Performance Parametersmentioning

confidence: 99%

Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake

Qu¹,

Zhao²,

Zhou³

2017

Shock and Vibration

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This paper presents a refined analysis for evaluating low-cycle fatigue crack initiation life of welded beam-to-column connections of steel frame structures under strong earthquake excitation. To consider different length scales between typical beam and column components as well as a few crucial beam-to-column welded connections, a multiscale finite element (FE) model having three different length scales is formulated. The model can accurately analyze the inelastic seismic response of a steel frame and then obtain in detail elastoplastic stress and strain field near the welded zone of the connections. It is found that the welded zone is subjected to multiaxial nonproportional loading during strong ground motion and the elastoplastic stress-strain field of the welded zone is three-dimensional. Then, using the correlation of the Fatemi-Socie (FS) parameter versus fatigue life obtained by the experimental crack initiation fatigue data of the structural steel weldment subjected to multiaxial loading, the refined evaluation approach of fatigue crack initiation life is developed based on the equivalent plastic strain at fatigue critical position of beam end seams of crucial welded connections when the steel frame is subjected to the strong earthquake excitation.

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Effect of multiaxial strain amplitudes on the cyclic behavior for SN490B steel under proportional loading

Teramae,

Hiyoshi,

Hirata

et al. 2024

Construction and Building Materials

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Multiaxial Cycle Deformation and Low-Cycle Fatigue Behavior of Mild Carbon Steel and Related Welded-Metal Specimen

Cited by 6 publications

References 21 publications

Multiaxial low‐cycle fatigue life evaluation under different non‐proportional loading paths

Multiaxial low‐cycle fatigue life evaluation under different non‐proportional loading paths

Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake

Effect of multiaxial strain amplitudes on the cyclic behavior for SN490B steel under proportional loading

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