Creep-fatigue and cyclically enhanced creep mechanisms in aluminium based metal matrix composites

Giugliano, Dario; Barbera, Daniele; Chen, Haofeng; Cho, Nak-Kyun; Liu, Yinghua

doi:10.1016/j.euromechsol.2018.10.015

Cited by 25 publications

(13 citation statements)

References 41 publications

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“…Therefore, the n value in Equation (2) can be derived from Equation (1), which is plotted (on a log-log axis) in Figure 3. Information of the stress exponent n can be used to verify the creep mechanisms [20]. As shown in Figure 2 and Table 2, the creep of Al-Li alloys increases stepwise with aging time.…”

Section: Microstructure Observation and Characterizationmentioning

confidence: 99%

Study on Multi-Step Creep Aging Behavior of Al-Li-S4 Alloy

Xia

Zhan

et al. 2019

Metals

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Creep age forming (CAF) is a new technology developed for manufacturing large aluminum components in the aerospace industry. Aluminum–lithium alloys may be used in aerospace components because of their high modulus, specific strength and specific stiffness. Therefore, the creep deformation, mechanical properties and aging precipitation of Al-Li-S4 alloy under CAF conditions were studied. It was found that the creep behavior presents double steady state creep stages during the creep aging process. With the increase of stress level, the first steady creep rate increased, but the second steady creep rate was slightly reduced. Coincidentally, in the first steady state creep stage, the yield strength of the studied alloy also showed a slow increase stage. TEM observation showed that Al-Li-S4 alloy mainly contains two precipitation phases, T1 phase and θ’ phase. A few precipitates form during the first steady creep stage. Then, a lot of nucleation and growth of T1 phase resulted in rapid increase of yield strength. At the same time, the increase of stress level effectively inhibited the growth of T1 phase, which resulted in these strengthening phases being more uniform, and thus improved the mechanical properties of materials. On this basis, the relationship between the multi-step behaviors of creep, mechanical properties and aging precipitates are discussed. It is considered that the main reasons for the multi-step phenomenon of creep and mechanical properties are strongly related to the nucleation, growth and distribution of T1 phase.

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Section: Microstructure Observation and Characterizationmentioning

confidence: 99%

Study on Multi-Step Creep Aging Behavior of Al-Li-S4 Alloy

Xia

Zhan

et al. 2019

Metals

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“…The introduced hold time caused the transformation of high energy lath structure into more stable structure 33 . Dario et al 34 reported the cyclically enhanced creep mechanisms in aluminum‐based metal matrix composites. Goswami 35 reported the peak strain amplitude hold significantly affected the CFI life.…”

Section: Introductionmentioning

confidence: 99%

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Zhao

Han

et al. 2020

Fatigue Fract Eng Mat Struct

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Considering the flexible operation conditions, the creep‐fatigue performance of P92 steel plays a crucial role in manufacturing structural components of ultra‐supercritical fossil power plants at 620°C–630°C. The creep‐fatigue interaction tests of P92 steel were conducted at 630°C in air with different duration periods, where the duration periods were simultaneously added on the peak tensile strain and valley compressive strain. The addition of hold time resulted in a rapid decrease of fatigue life, where the reduction amplitude increasing with the hold time. There was more than five times reduction as the hold time increased to 300 s. Moreover, the stress relaxation behavior during hold time exhibited a saturation behavior at long dwell time, where the limited relaxed stress gradually approached to the creep threshold stress. Furthermore, a modified strain energy density exhaustion model involving creep threshold stress was proposed and provided more accurate predictions in comparison with the conventional model, reducing the conservatism.

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“…Validity and applicability of the LMM framework have been also acknowledged by a variety of commercial industry partners [25][26][27], in particular the LMM DSCA method has been selected by R5 research programme of EDF energy to the commercial standard [9]. In particular for the composite materials, the eDSCA was employed to analyse the cyclic creep and plastic behaviours [28][29][30]. Based on the reliability, the LMM eDSCA method is adopted for the numerical analysis in the present work.…”

Section: Direct Methods Employed For the Cyclic Plastic And Cyclic Crmentioning

confidence: 99%

“…Δt = 1hr, 10hrs, and 100hrs. When a dwell time is introduced within the thermal load history, different mechanisms can arise depending upon the loading condition applied and the state of stress at the matrix-reinforcement interface [41]. Indeed as reported in [24] within the shakedown boundary the structure can exhibit either shakedown or creep enhanced plasticity.…”

Section: Simulation Model Setupmentioning

confidence: 99%

Cyclic plasticity and creep-cyclic plasticity behaviours of the SiC/Ti-6242 particulate reinforced titanium matrix composites under thermo-mechanical loadings

Giugliano

Cho

Chen

et al. 2019

Composite Structures

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The purpose of this work is to investigate the cyclic plasticity and creep-cyclic plasticity behaviours of particle reinforced titanium matrix composites (PRTMCs) SiC/Ti-6242, aimed to be used in high temperature applications. The investigation has been conducted upon microstructures that have been taken from a previous study where low-fidelity model-based optimization (LFMBO) has been used to maximise the elastic behaviour of particle reinforced aluminium matrix composites. The effect of the particle spatial distribution, particle fraction volume and number of particles on the shakedown limit, limit load and creep-cyclic plasticity have been explored by direct numerical techniques based on the Linear Matching Method (LMM) framework. The micromechanical approach to modelling and fifteen multi-particle unit cells have been investigated. Under cyclic loading conditions, the structural response of PRTMCs is not trivial and becomes even more significant when high temperature is involved. Hence, the factors that affect the creep and cyclic plasticity of PRTMCs are analysed and discussed, including effects of the applied load level, dwell period and temperature on the composites' performance. The applicability and accuracy of the proposed direct method has also been verified by the step-by-step analysis.

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Creep-fatigue and cyclically enhanced creep mechanisms in aluminium based metal matrix composites

Abstract: Reference transition hysteresis loops for the three cross-section studied. Finite element models, shakedown limit boundaries and load history applied.

Cited by 25 publications

References 41 publications

Study on Multi-Step Creep Aging Behavior of Al-Li-S4 Alloy

Study on Multi-Step Creep Aging Behavior of Al-Li-S4 Alloy

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Cyclic plasticity and creep-cyclic plasticity behaviours of the SiC/Ti-6242 particulate reinforced titanium matrix composites under thermo-mechanical loadings

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