An efficient fatigue and creep‐fatigue life prediction method by using the hysteresis energy density rate concept

Wang, Qiang; Xu, Zhaowen; Wang, Xi-Shu

doi:10.1111/ffe.13230

Cited by 11 publications

(4 citation statements)

References 42 publications

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“…More reliable estimation performance could be further achieved by combining the proposed model with some probabilistic approaches. Considering the diversities in material characteristics and loading conditions, more investigations are necessary in the future to evaluate the universality of the proposed model for different application scenarios, particularly for high-temperature fatigue issues in which the strain or energy rate plays an important role (Wang et al., 2020b).…”

Section: Model Evaluations and Comparisonsmentioning

confidence: 99%

Estimation of remaining fatigue life with an energy-based model considering the effects of loading sequence and load interaction

Gan

Zhong

2022

International Journal of Damage Mechanics

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Accurate estimation of remaining fatigue life is crucial to assess the structural durability and reliability of engineering components. For this purpose, an energy-based model is proposed in this paper for modeling the process of fatigue damage accumulation under multistep loading. To account for the effects of loading sequence and load interaction, two parameters, a concept of normalized fatigue driving energy (NFDE) and a load interaction factor, are introduced in the model. The former is based on variable energy-life curves and the latter is formulized as an exponential function of the loading intensity ratio and the number of loading cycles. The implementation procedure of such model only requires the loading information and materials’ basic fatigue properties. Moreover, extensive experimental results of six metallic materials under two-, four- and eight-step loadings with different loading sequences are employed for model comparative study. The results indicate that, compared with several existing damage models, the proposed model can provide better remaining fatigue life estimations under multistep loading.

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Section: Model Evaluations and Comparisonsmentioning

confidence: 99%

Estimation of remaining fatigue life with an energy-based model considering the effects of loading sequence and load interaction

Gan

Zhong

2022

International Journal of Damage Mechanics

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“…Fatigue-creep interaction is a key factor for the failure of many engineering components and structures under high temperature and cyclic loading. 34,35 In this study, highfrequency induction heating was used to model the thermal shock process of the piston. The temperature changed so quickly that it was difficult to maintain 350 C for 1-3 min.…”

Section: Limitations and Potential Improvementsmentioning

confidence: 99%

Experimental and computational study on thermo‐mechanical fatigue life of aluminium alloy piston

Chen

et al. 2020

Fatigue Fract Eng Mat Struct

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To assess the life of a new diesel aluminium alloy piston under thermal shock loads, thermo-mechanical fatigue (TMF) testing was conducted to characterise the TMF properties of the piston alloy, and an empirical model based on the constraint ratio concept was proposed to predict the TMF life of the piston. Considering that the empirical model required expensive experimental support, a platform with high-frequency induction heating was established to simulate the force on the piston under thermal shock loads to calculate the piston life using the thermal shock test. Additionally, a finite element method was developed to compute the distributions of temperature, strain, and stress during this process. The characteristics of crack initiation and propagation in TMF test rods and piston mock-ups were also investigated. The results showed that the TMF test rod suffered brittle fracture with brittle quasi-cleavage features. The microcracks mainly occurred in primary Si particles due to stress concentration around the primary Si particles induced by the difference between the thermal expansion coefficients of Si and Al. From a macro perspective, the piston initially cracked at the rim above the pinhole, where the stress is larger than that along other directions. From a micro perspective, the protrusions of various sizes on the piston rim were induced by the compression stresses at high temperature. The piston cracks usually initiate around primary Si particles, propagate along the edge of primary Si in a straight line, bifurcate and then stop at a certain depth. If the piston was only heated, cracks or plastic deformations were not produced. The piston life can be assessed using the proposed empirical model based on the constraint ratio concept or thermal shock testing based on the developed platform. The difference between the predicted and experimental life was not greater than 7%.

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“…[5][6][7][8] Creep-fatigue interaction is a typical damage mode of turbine components, and attracts numerous attentions. [17][18][19][20] Wang et al 17 proposed a creep-fatigue life estimation model using the concept of the hysteresis energy density rate. Rai et al 18 experimentally investigated the creep-fatigue deformation micromechanisms of CM 247 DS LC alloy and suggested that the generation of dislocation substructures changed with the dwell times.…”

Section: Introductionmentioning

confidence: 99%

“…Creep‐fatigue interaction is a typical damage mode of turbine components, and attracts numerous attentions 17–20 . Wang et al 17 proposed a creep‐fatigue life estimation model using the concept of the hysteresis energy density rate.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on creep‐fatigue behaviours of as‐received and service‐exposed turbine blades: Mechanism and life evaluation

Shi

Yang

et al. 2020

Fatigue Fract Eng Mat Struct

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In the present study, both the as-received and the 600-h-serviced turbine blades were tested under the creep-fatigue loading. The results showed that the service-exposed blades exhibited a longer creep-fatigue life than the asreceived ones due to the refinement of grain size and the increasing of hardness during the service process. Micro structural characterization revealed that there was no directional coarsening or rafting of γ 0 precipitate after 600 h of service. Moreover, the as-received blades exhibited initial cyclic hardening followed by saturation and softening, whereas the 600-h-serviced blades only exhibited continuous softening until fracture. A conservative service life prediction approach was proposed considering the experienced mission profile. This service life estimation method provides a new way to assess the durability of turbine blade.

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An efficient fatigue and creep‐fatigue life prediction method by using the hysteresis energy density rate concept

Cited by 11 publications

References 42 publications

Estimation of remaining fatigue life with an energy-based model considering the effects of loading sequence and load interaction

Estimation of remaining fatigue life with an energy-based model considering the effects of loading sequence and load interaction

Experimental and computational study on thermo‐mechanical fatigue life of aluminium alloy piston

Experimental investigation on creep‐fatigue behaviours of as‐received and service‐exposed turbine blades: Mechanism and life evaluation

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