Invariant-based and Critical-plane Rainflow Approaches for Fatigue Life Prediction Under Multiaxial Variable Amplitude Loading

Meggiolaro, Marco Antônio; Castro, Jaime Tupiassú Pinho de; Wu, Hao

doi:10.1016/j.proeng.2015.02.010

Cited by 10 publications

(10 citation statements)

References 13 publications

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“…This multiaxial cycle counting is carried out in a six‐dimensional stress space, or even in a reduced five‐dimensional deviatoric stress space. A short account of the rainflow method application within the framework of stress‐invariant approach for multiaxial fatigue is discussed by Meggiolaro and coworkers, along with the critical‐plane approach.…”

Section: Time Domain (Numerical Deterministic) Approaches For Multiamentioning

confidence: 99%

A review of multiaxial fatigue criteria for random variable amplitude loads

Carpinteri

Spagnoli

2017

Fatigue Fract Eng Mat Struct

114

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Nowadays, the estimation of fatigue life under multiaxial random loading is still an extremely complex task. In this paper, a comprehensive review of the multiaxial random fatigue criteria available in the literature is presented. Such a review is mainly devoted to stress‐based criteria for the evaluation of fatigue life in high‐cycle regime. Time and frequency domain approaches are examined. The focus of this paper is related to uniform stress/strain distribution, but also the effect of stress/strain gradient is tangentially addressed. More than 200 references are cited.

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Section: Time Domain (Numerical Deterministic) Approaches For Multiamentioning

confidence: 99%

A review of multiaxial fatigue criteria for random variable amplitude loads

Carpinteri

Spagnoli

2017

Fatigue Fract Eng Mat Struct

114

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“…An overview of more available methods can be found in Socie and Marquis and Fatemi and Shamsaei . There are also some newer approaches like a modified Wang‐Brown‐method for on‐line processing or a modified Wang‐Brown‐method using only the deviatoric stress space . Additionally, some integral approaches exist, eg, where no cycle counting is necessary.…”

Section: Crack Initiation Under Local Nonproportional Stresses and Stmentioning

confidence: 99%

“…40,41 There are also some newer approaches like a modified Wang-Brown-method for on-line processing 42 or a modified Wang-Brown-method using only the deviatoric stress space. 43,44 Additionally, some integral approaches exist, eg, 45 where no cycle counting is necessary. In Ahmadi and Zenner, 46 the damage accumulation is replaced by crack growth, where stages I and II phases of short crack growth are distinguished.…”

Section: Fatigue Assessment Of Local Nonproportional Stresses and Smentioning

confidence: 99%

Fatigue of engineering structures under combined nonproportional loads: An overview

Vormwald

Hertel

Zerres

2018

Fatigue Fract Eng Mat Struct

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Nonproportionality in fatigue is a matter of loading sequences acting on structures. In such loading cases, a life assessment‐based search of the initiation site is required. This means that for a variety of potential sites, their stress‐strain sequences must be determined and the corresponding fatigue lives have to be calculated. For the determination of local stress‐strain sequences, a superposition of the action of loads at all times for all potential sites must be performed. The superposition has not only to be performed at a particular time of a load reversal but also for a sufficiently large number of intermediate points in time. For the assessment of crack initiation under local nonproportional stress‐strain sequences, a multiaxial fatigue damage hypothesis must be specified. Due to the superiority with respect to accuracy, critical plane approaches are the favourite ones when dealing with nonproportional fatigue of ductile metals. For describing fatigue crack growth, the time sequences for the stress intensity factors corresponding to the 3 opening modes must be obtained by superposition. A mixed‐mode hypothesis must be applied to predict both the direction and the increment of crack growth at each crack front point. A first prediction trial should be based on an appropriate extension of the maximum tangential stress hypothesis. An application of a variant of the maximum shear stress hypothesis might be an amendment. Especially in the case of crack turning, the consideration of crack face contact is mandatory.

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“…Indeed, not even the removal from multiaxial VAL histories of apparently redundant data points that are not reversals of any of their stress or strain components is appropriate because: (i) the path between two load reversals is needed to evaluate the path-equivalent stress or strain associated with each rainflow count, e.g. using a convex-enclosure method [3,4]; and (ii) reversal points from a multiaxial rainflow algorithm might not occur at a reversal of one of the stress or strain components. To solve issues like those, a truly MRF that can remove non-damaging events from multiaxial load paths represented in a sub-space from the 6D stress or strain space has been recently proposed in [5], extending its peg inside a slot 1D analogy illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Mean/Maximum Stress Effects in the Multiaxial Racetrack Filter

Meggiolaro¹,

Castro²,

Wu³

2016

Frattura Ed Integrità Strutturale

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This work extends the Multiaxial Racetrack Filter (MRF) to incorporate mean or maximum stress effects, adopting a filter amplitude that depends on the current stress level along the stress or strain path. In this way, a small stress or strain amplitude event can be filtered out if associated with a non-damaging low mean or peak stress level, while another event with the very same amplitude can be preserved if happening under a more damaging high mean or peak stress level. The variable value of the filter amplitude must be calculated in real time, thus it cannot depend on the peak or mean stresses along a load event, because it would require cycle identification and as so information about future events. Instead, mean/maximum stress effects are modeled in the filter as a function of the current (instantaneous) hydrostatic or normal stress along the multiaxial load path, respectively for invariantbased and critical-plane models. The MRF efficiency is evaluated from tension-torsion experiments in 316L stainless steel tubular specimens under non-proportional (NP) load paths, showing it can robustly filter out nondamaging events even under multiaxial NP variable amplitude loading histories.

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Invariant-based and Critical-plane Rainflow Approaches for Fatigue Life Prediction Under Multiaxial Variable Amplitude Loading

Cited by 10 publications

References 13 publications

A review of multiaxial fatigue criteria for random variable amplitude loads

A review of multiaxial fatigue criteria for random variable amplitude loads

Fatigue of engineering structures under combined nonproportional loads: An overview

Incorporation of Mean/Maximum Stress Effects in the Multiaxial Racetrack Filter

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