Thermo-Mechanical Fatigue Lifetime Assessment with Damage-Parameters, Energy-Criterions and Cyclic-J-Integral Concepts

Riedler, Martin; Minichmayr, Robert; Winter, George; Eichlseder, Wilfried

doi:10.1007/1-4020-4972-2_118

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…The effect of different casting processes on isothermal (in room and high temperatures) and un-isothermal fatigue behaviors of aluminum-silicon alloys was studied by Bose-Filho et al [25]. A modified energy criterion, entitled "unified energy approach" was proposed by Riedler et al [26,27] who compared their model (which was calibrated with TMF test results) to conventional approaches for AlSi7MgCu0.5 alloy. Takahashi and Sasaki [28] checked the effect of the artificial ageing process on the TMF lifetime of A356-T6 alloy.…”

Section: A R C H I V E O F S I Dmentioning

confidence: 99%

The Effect of Various Parameters on Out-of-phase Thermo-mechanical Fatigue Lifetime of A356.0 Cast Aluminum Alloy

Azadi

Farrahi

Winter

et al. 2012

IJE

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In this paper, the effect of various parameters on the out-of-phase thermo-mechanical fatigue (OP-TMF) lifetime of the A356.0 cast aluminum alloy is investigated. Studied parameters include the maximum temperature, the dwell time, and the thermo-mechanical loading factor. OP-TMF tests are conducted considering realistic running conditions of diesel engine cylinder heads. The maximum temperature varies between 200 to 275°C and the thermo-mechanical loading factor, which is the ratio of the mechanical strain to the thermal strain, is considered between 75 to 150%. The dwell time (or the holding time) changes between 5 to 180 sec. at the maximum temperature. Fracture surfaces of specimens are studied using the scanning electron microscopy (SEM). These SEM images reveal that the A356.0 alloy has a ductile behavior. The cyclic softening phenomenon is also observed during stress-strain hysteresis loops. TMF test results demonstrate that the dwell time bears no significant effect upon the lifetime. However, large influences for the maximum temperature and the thermomechanical loading factor are depicted in the lifetime of the A356.0 alloy.

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Section: A R C H I V E O F S I Dmentioning

confidence: 99%

The Effect of Various Parameters on Out-of-phase Thermo-mechanical Fatigue Lifetime of A356.0 Cast Aluminum Alloy

Azadi

Farrahi

Winter

et al. 2012

IJE

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“…Ostergren [9] (P OST ) assumes a correlation between the lifetime of the material, and the hysteresis energy which is the area of the stress-strain-hysteresis in the tensile domain. Subsequent investigations of Riedler [4] (W u ) show the possibility of using a common energy criterion, which is the unified energy approach. Based on the consideration that the elastic loading part is affected by the maximum stress; while the plastic part is affected by the stress amplitude, a combined approach is developed in order to simulate the lifetime of out-of-phase TMF loaded materials.…”

Section: Simulation Of the Lifetimementioning

confidence: 99%

“…Due to the interplay of strain and stress values under TMF loading, they are able to account for more specific influences as well as their interactions. It is shown in former works of Riedler [2,4], that energy based criteria are very practical for lifetime approaches. To estimate the lifetime, a damage parameter which is based on the energy (elastic and plastic) of a hysteresis loop, has been developed [5].…”

Section: Introductionmentioning

confidence: 99%

Valuation of TMF Lifetime Calculation Methods and their Limitations of Usability

Köberl

Winter

Eichlseder

2011

KEM

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Cyclic loading of metallic engineering components at constant elevated or fluctuating temperature causes a complex evolution of damage which can hardly be described. At the same time the thermal expansion is restricted in some regions, due to the complex geometry of the components. Therefore, mechanical stresses occur and cyclic plastic deformation leads to thermo-mechanical fatigue (TMF) of the material. A careful analysis and comparison of the experimental results, based on a systematical variation of the relevant influence factors, allow to develop empirical models for computing the fatigue life of thermo-mechanical loaded components made of Ni alloys (IN718, Ni200/201). Different lifetime calculation methods were executed and analyzed to fulfil the requirements for the fatigue analysis of components made of these alloys. In addition, the model parameters can be optimized using these results. Based on the parameters, which define the usability of the investigated lifetime models, e.g. temperature, stress, plastic strain, the limiting combination of the parameters can be described. This graphical representation of the “border line” or limiting combination can also be used for any other materials. The results show that the main lifetime calculation models can only applied in a limited range. This limited range is mainly defined by temperature, strain constraining and their combination.

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“…The effect of different casting processes on isothermal (at low and high temperatures) and non-isothermal fatigue behaviors of aluminum-silicon alloys was studied by Bose-Filho et al [25]. Riedler et al [26,27] presented a special modified energy method, "unified energy approach" and compared to conventional approaches for the AlSi7MgCu0. 5 alloy by using TMF tests results.…”

mentioning

confidence: 99%

Comparison Between Isothermal and Non-Isothermal Fatigue Behavior in a Cast Aluminum-Silicon-Magnesium Alloy

et al. 2015

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Thermo-Mechanical Fatigue Lifetime Assessment with Damage-Parameters, Energy-Criterions and Cyclic-J-Integral Concepts

Cited by 4 publications

References 2 publications

The Effect of Various Parameters on Out-of-phase Thermo-mechanical Fatigue Lifetime of A356.0 Cast Aluminum Alloy

The Effect of Various Parameters on Out-of-phase Thermo-mechanical Fatigue Lifetime of A356.0 Cast Aluminum Alloy

Valuation of TMF Lifetime Calculation Methods and their Limitations of Usability

Comparison Between Isothermal and Non-Isothermal Fatigue Behavior in a Cast Aluminum-Silicon-Magnesium Alloy

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