Microstructure-Sensitive Fatigue Modeling of AISI 4140 Steel

Jordon, J.B.; Horstemeyer, M.F.

doi:10.1115/1.4025424

Cited by 12 publications

(2 citation statements)

References 22 publications

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“…The microstructure-sensitive fatigue (MSF) model implemented in this study was first proposed by McDowell [39,40] for aluminum alloy A356-T6 [41]. The model was further expanded to additional aluminum alloys [42][43][44][45], other materials [46][47][48][49][50][51][52], and AM processes [30,53,54]. To elucidate the microstructural effect of AFS-D on fatigue resistance, the MSF was calibrated for the AFS-D using initial calibration parameters determined by Avery et al [30].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy Repaired via Additive Friction Stir Deposition

Avery

Cleek

Phillips

et al. 2022

Journal of Engineering Materials and Technology

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A novel solid-state additive manufacturing (AM) process, additive friction stir deposition (AFS-D), provides a new pathway for additively repairing damaged nonweldable aerospace materials that are susceptible to induced thermal gradients within the microstructure. In this work, we quantify the microstructural evolution and mechanical performance of an additively repaired AA7075-T651 (Al-Zn-Mg-Cu) via the AFS-D process. To evaluate the AFS-D process for repairing high strength aluminum alloys, the AFS-D technique was used to additively fill a linear groove that was machined into an AA7075-T651 plate. After repairing the plate with the AFS-D process, the repaired plate was subjected to standard T6 heat treatment. The results of this study show that the heat-treated AFS-D repair did not exhibit any significant grain growth and demonstrated an increase in the average Vickers hardness in the repair compared with the wrought 7075-T651 control. Tensile and fatigue behavior was investigated for heat-treated repair and compared with the wrought AA7075-T651 control. The heat-treated repair exhibited wrought-like tensile properties for yield stress (YS) and ultimate stress; however, the heat-treated repair had significant scatter in the elongation to failure. Additionally, the mean fatigue behavior of the heat-treated repairs displayed a reduction in cycles to failure compared with the wrought control. Lastly, a microstructure-sensitive fatigue life model was used to elucidate process-structure-property fatigue mechanism relations of the heat-treated repair and wrought AA7075.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy Repaired via Additive Friction Stir Deposition

Avery

Cleek

Phillips

et al. 2022

Journal of Engineering Materials and Technology

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“…J B Jordon. et al employed a microstructure-based fatigue model to evaluate the fatigue cracks damage in 4140 steel [4]. J A R Duran.…”

Section: Introductionmentioning

confidence: 99%

PTEE Material Life Modeling based on Compound Poisson Process of Fatigue Crack

Liu¹,

Miao²

2017

Proceedings of the 2017 International Conference on Mechanical, Electronic, Control and Automation Engineering (MECAE 2017)

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In order to study the life modeling problem of the PTEE material, this paper proposes a Compound Poisson process life modeling method for PTEE material, which performance degradation process is modeled by the PTEE material impact fatigue crack. In the impact work condition, the number of impact times of the material obeys the Poisson process and the damage caused by each impact has a cumulative effect. By using fatigue cumulative damage theory, we can obtain the Compound Poisson process model. Then, the parameters point estimation of Compound Poisson process model are evaluated by using moment estimation method combined with least-square principle method and we utilize fatigue crack data of FTEE material to evaluate the life of PTEE material. A case study on PTEE sealing material for a ship gas turbine generator with reliability degradation testing is used to demonstrate the accuracy and effectiveness of the proposed method. This method solves the problem of material life modeling and evaluation of fatigue crack due to impact characteristics. It can be used as a reference for the reliability evaluation of the similar material products.

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