Characterization of Strain-Controlled Low-Cycle fatigue and fracture behavior of P91 steel at elevated temperatures

Nguyen, Thanh Tuan; Yoon, Kee Bong; Park, Jaeyeong; Baek, Un Bong

doi:10.1016/j.engfailanal.2021.105887

Cited by 15 publications

(12 citation statements)

References 44 publications

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“…The plastic strain amplitude in equation (10) is given by Coffin-Manson’s equation as previously proposed in literature ( Manson and Hirschberg, 1970 ; Coffin, 1978 ):

where

is fatigue ductility coefficient, c is fatigue ductility exponents, and

is plastic strain. The intersection of the elastic strain curve (Basquin’s equation) and plastic strain curve (Coffin-Manson’s equation) clearly demonstrates the transition life cycle (

) from a plastic-dominated fatigue regime to an elastic-dominated fatigue regime ( Nguyen et al, 2022 ), by substituting

as follows,

…”

Section: Discussionmentioning

confidence: 98%

“…The validity domain of the stress-life or strain-life approaches can be investigated using the transition fatigue life ( N t ) (i.e., the number of loading cycles where the elastic and plastic strain are equal) ( Nguyen et al, 2022 ). If the number of loading cycles is lower than N t , then the deformation is dominated by plastic strain and should be addressed by a strain-based approach.…”

Section: Discussionmentioning

confidence: 99%

“…If the number of loading cycles is lower than N t , then the deformation is dominated by plastic strain and should be addressed by a strain-based approach. On the other hand, if the number of cycles is higher than N t , then the deformation should be addressed by a stress-based approach ( Nguyen et al, 2022 ). The total strain amplitude (

) is the sum of elastic and plastic strains amplitude which is described in detail in ( Manson, 1979 ).…”

Section: Discussionmentioning

confidence: 99%

“…This transition life cycle is typically considered as the transition between low and high cycle fatigue for the material ( Nguyen et al, 2022 ). In the high cycle fatigue regime above the N t values, the fatigue strength (

) is the dominant factor in the fatigue performance of materials.…”

Section: Discussionmentioning

confidence: 99%

“…In the high cycle fatigue regime above the N t values, the fatigue strength (

) is the dominant factor in the fatigue performance of materials. In the low cycle fatigue regime, in which the plastic strain is the dominantfactor, the fatigue ductility (

) dictates the fatigue performance of the material ( Nguyen et al, 2022 ; Kim et al, 2023 ). The Equation (10) was plotted for Ti6Al4V material in Figure 9 in black solid line (total strain amplitude), this figure also indicates the elastic strain amplitude (Basquin’s equation) and plastic strain amplitude (Coffin-Manson’s equation) during fatigue life.…”

Section: Discussionmentioning

confidence: 99%

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Experimental analysis and numerical fatigue life prediction of 3D-Printed osteosynthesis plates

Nakhaei¹,

Sterba²,

Foletti

et al. 2023

Front. Bioeng. Biotechnol.

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The trend towards patient-specific medical orthopedic prostheses has led to an increased use of 3D-printed surgical implants made of Ti6Al4V. However, uncertainties arise due to varying printing parameters, particularly with regards to the fatigue limit. This necessitates time-consuming and costly experimental validation before they can be safely used on patients. To address this issue, this study aimed to employ a stress-life fatigue analysis approach coupled with a finite element (FE) simulation to estimate numerically the fatigue limit and location of failure for 3D-printed surgical osteosynthesis plates and to validate the results experimentally. However, predicting the fatigue life of 3D components is not a new concept and has previously been implemented in the medical device field, though without experimental validation. Then, an experimental fatigue test was conducted using a proposed modification to the staircase method introduced in ISO 12107. Additionally, a FE model was developed to estimate the stress cycles on the plate. The stress versus number of cycles to failure curve (S-N) obtained from the minimum mechanical properties of 3D-printed Ti6AI4V alloy according to ASTM F3001-14 to predict the fatigue limit. The comparison between experimental results and fatigue numerical predictions showed very good agreement. It was found that a linear elastic FE model was sufficient to estimate the fatigue limit, while an elastic-plastic model led to an accurate prediction throughout the implant’s cyclic life. The proposed method has great potential for enhancing patient-specific implant designs without the need for time-consuming and costly experimental regulatory testing.

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“…The plastic strain amplitude in equation (10) is given by Coffin-Manson’s equation as previously proposed in literature ( Manson and Hirschberg, 1970 ; Coffin, 1978 ):

where

is fatigue ductility coefficient, c is fatigue ductility exponents, and

is plastic strain. The intersection of the elastic strain curve (Basquin’s equation) and plastic strain curve (Coffin-Manson’s equation) clearly demonstrates the transition life cycle (

) from a plastic-dominated fatigue regime to an elastic-dominated fatigue regime ( Nguyen et al, 2022 ), by substituting

as follows,

…”

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

) is the sum of elastic and plastic strains amplitude which is described in detail in ( Manson, 1979 ).…”

Section: Discussionmentioning

confidence: 99%

) is the dominant factor in the fatigue performance of materials.…”

Section: Discussionmentioning

confidence: 99%

“…In the high cycle fatigue regime above the N t values, the fatigue strength (

) is the dominant factor in the fatigue performance of materials. In the low cycle fatigue regime, in which the plastic strain is the dominantfactor, the fatigue ductility (

Section: Discussionmentioning

confidence: 99%

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