Life Prediction of Thermal-Mechanical Fatigue Using Strainrange Partitioning

Halford, Gary R.; Manson, S. S.

doi:10.1520/stp27895s

Cited by 53 publications

(22 citation statements)

References 8 publications

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“…The characteristics, capabilities and the applications of SRP to high temperature-low cycle fatigue prediction has been the subject of many investigations [3,5,13,14]. The applicability of SRP to a variety of structural steels and alloys [15,16] as well as high temperature nickel base alloys , and even to thermalmechanical fatigue [20] indicates that this method can take into account both time independent and time dependent damage developed during low cycle fatigue.…”

Section: Mean Stress Modijied Strain Range Partitioningmentioning

confidence: 99%

“…It has been well recognised that strain dwells (hold times), in total strain controlled low cycle fatigue testing, have a pronounced effect on the cyclic life for polycrystalline materials [ 1,3,4,20]. However, for various materials, at different temperatures, there are conflicting arguments as to whether tension or compression hold times are the more damaging.…”

Section: Efect Ofstrain Dwell On Low Cycle Fatigue Lifementioning

confidence: 99%

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High Temperature Fatigue‐creep Behaviour of Single Crystal Srr99 Nickel Base Superalloys: Part Ii—fatigue‐creep Life Behaviour

Li¹,

Smith²

1995

Fatigue Fract Eng Mat Struct

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Experimental and theoretical investigations on the influence of temperature, strain dwells and crystal orientation on the high temperature fatigue-creep life behaviour of single crystal SRR99 nickel base superalloy were performed. For a given temperature and loading condition, the longest fatigue life was observed for tests with [OOl] orientations, while the [ 1111 orientation yielded the shortest fatigue life. A simple approach, using an orientation function f(Ahkl), was applied successfully to correlate the influence of orientation. Using this function, the shortest fatigue life was observed for tests with a compressive dwell at 750"C, but at 1050°C tests with a tensile dwell exhibited the shortest life. Compared with continuous cycling tests, tests with tensile dwells showed remarkably longer lives at 750°C, significantly shorter lives at 1O5O0C, and almost identical lives at 950°C; tests with compressive dwells always exhibited shorter lives than continuous cycling tests at all temperatures. The influence of strain dwells on the life of SRR99 was via the simultaneous effects of mean stress, additional inelastic strain, and time dependent damage. A mean stress modified strain range partitioning method was proposed and used to predict the fatigue-creep life. NOMENCLATUREOjO = continuous cycling tests O/t =tests with compressive strain dwells ti0 = tests with tensile strain dwells tit = tests with both tensile and compressive strain dwells Ahkl = crystal orientation parameter uo, eo = stress and strain normalisation constants A g = total stress range Ac = total strain range 6, = mean stress R = stress ratio p p = completely reversed plasticity cp = tensile creep reversed by compressive plasticity pc = tensile plasticity reversed by compressive creep cc = completely reversed creep beij (ij = pp. cp, pc, cc) = partitioned inelastic strain Nij (ij = pp, cp, pc, cc) = partitioned fatigue life Fij (ij = pp, cp, pc, cc) = ratio of partitioned with total inelastic strain Nf = number of cycles to failure om,, = maximum stress

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Section: Mean Stress Modijied Strain Range Partitioningmentioning

confidence: 99%

Section: Efect Ofstrain Dwell On Low Cycle Fatigue Lifementioning

confidence: 99%

High Temperature Fatigue‐creep Behaviour of Single Crystal Srr99 Nickel Base Superalloys: Part Ii—fatigue‐creep Life Behaviour

Li¹,

Smith²

1995

Fatigue Fract Eng Mat Struct

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“…One of the most useful strain‐based approaches is the strain range partitioning method, 6–8 which refers to four basic life relations, determined independently by specific tests. The four basic conditions correspond to the decomposition of the inelastic strain into a rapid transient part (plastic) and a slowly evolving time‐dependent part (creep) and to the separation between tensile‐like and compressive‐like conditions.…”

Section: A Brief Overview Of the Life Prediction Methodsmentioning

confidence: 99%

An overview of the damage approach of durability modelling at elevated temperature

Chaboche

Gallerneau

2001

Fatigue Fract Eng Mat Struct

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Lifetime prediction techniques for components working at elevated temperature are revisited. Two damage approaches in which time effects at high temperature are introduced in different ways are discussed in greater detail. First, a creep–fatigue damage model considers the interaction of the two processes during the whole life before macrocrack initiation; and second, a creep–fatigue–oxidation model separates the fatigue life into two periods: during initiation the environment‐assisted processes interact with fatigue, although bulk creep damage only interacts during the micropropagation period. The second model is illustrated by its application to a coated single‐crystal superalloy used in aerojet turbine blades. Its capabilities are illustrated in a number of isothermal and thermomechanical fatigue tests. Anisotropy effects are also briefly discussed and a special test, introducing cyclic thermal gradients through the wall thickness of a tubular component, demonstrates the predictive capabilities for actual engine conditions.

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“…However, the direct application of this conclusion in evaluating the implications of modi cation of the piercing conditions is not reliable since the creep-thermal stress interaction must be evaluated. It is possible to make this evaluation by means of the Halford and Manson method [20], which consists in applying damage rules such as the ones proposed by Cof n [21], and determination of the stress-strain curve by the partition of the deformation domain method [22], where the partitions must be made according to the creep and thermal fatigue intervals of the piercing cycle. Fatigue by thermal stress of the material when the mandrel tip cools down increases when the cooling time decreases.…”

Section: Estimation Of the Damage Mechanisms For New Cooling Conditionsmentioning

confidence: 99%

Thermomechanical analysis of a piercing mandrel for the production of seamless steel tubes

Prince

Maroño

León

2003

Proceedings of the Institution of Mechanical Engineers, Part E:

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The heat transfer of a piercing mandrel for the production of seamless steel tubes is analysed, and the consequent thermal stresses are examined. The process of tube manufacture is described, and the problem to be addressed is identi ed. The analysis is based on a mathematical model with the essential boundary conditions, heat transfer coef cients in this case. For the solution of this mathematical model, the nite element method (FEM) is employed given the geometry of the tip of the mandrel and its initial and boundary conditions. The commercial software of the FEM employed makes it possible to nd the temperature elds of the mandrel tip, as well as the temperature histories of some points of interest, which agree with thermographic readings. Evaluation of the material, based on the temperature eld, shows that creep effects are important in wearing out of the mandrel tip and affect the number of tubes manufactured. Additionally, the methodology developed herein makes it possible to estimate the lifespan of the mandrel tip during the tube piercing stage, and to propose improvements for cooling of the mandrel tip.

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Life Prediction of Thermal-Mechanical Fatigue Using Strainrange Partitioning

Cited by 53 publications

References 8 publications

High Temperature Fatigue‐creep Behaviour of Single Crystal Srr99 Nickel Base Superalloys: Part Ii—fatigue‐creep Life Behaviour

High Temperature Fatigue‐creep Behaviour of Single Crystal Srr99 Nickel Base Superalloys: Part Ii—fatigue‐creep Life Behaviour

An overview of the damage approach of durability modelling at elevated temperature

Thermomechanical analysis of a piercing mandrel for the production of seamless steel tubes

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