Three Dimensional Thermal Strain and Stress Analysis of Single Edge Wedge Specimens

Ramteke, Ashok Lahanuji; Meyer-Olbersleben, F.; Rézaï-Aria, Farhad

doi:10.1007/978-94-011-2860-5_46

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Validation of the technique for "standard" OP, IP or "diamond" cycling is hampered by lack of I cyclic stress-strain data at suitable temperature intervals. However a schematic indication for superalloys cycled between 200°C and llOO°C [11, 25,43] is given in Fig. 11.…”

Section: Other Cycle Typesmentioning

confidence: 99%

The Determination of Hysteresis Loops in Thermo‐mechanical Fatigue Using Isothermal Stress‐strain Data

Skelton

1994

Fatigue Fract Eng Mat Struct

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Thermo-mechanical fatigue stress-strain data on ferritic/austenitic steels and superalloys from a variety of sources are analysed with regard to hysteresis loop stress asymmetry. This arises from a decoupling of the thermal and mechanical strain signals in the test technique so that many tensioncompression load combinations are possible. Data from simplified isothermal and bithermal tests are also examined. Taking a typical example of an "out-of-phase'' thermo-mechanical loop on a %CrMoV steel cycled between 200 and 550"C, isothermal stress-strain data were generated at 50°C intervals on material from the same cast and, used in conjunction with the elastic characteristics of the apparatus, an attempt was made to re-create this loop. The methods employed were (i) a graphical construction between appropriate isothermal yield contours (ii) a tangent modulus calculation (iii) a secant modulus calculation. Method (i) appeared to give the closest agreement in the present case. NOMENCLATURE A = constant in stress-strain law E = Young's modulus E, , = tangent modulus E,,, = secant modulus T = temperature r, q, F, G = listed parameters abbreviated for convenience T, , , = maximum temperature in cycle Tmi, = minimum temperature in cycle c( = expansion coefficient p = constant in stress-strain law AT = temperature rangeA$ = plastic strain range Aet = total strain range Au = stress range e, = total strain u = stress uT = peak tension stress uc = peak compression stress uT/bC = bias ratio

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Section: Other Cycle Typesmentioning

confidence: 99%

The Determination of Hysteresis Loops in Thermo‐mechanical Fatigue Using Isothermal Stress‐strain Data

Skelton

1994

Fatigue Fract Eng Mat Struct

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“…Nevertheless, there are no records of any measured transient thermal and mechanical strains in these specimens for polycrystalline as well as SX-alloys. For polycrystalline materials these parameters have been computed by finite elements method (FEM) using sophisticated heat transfer analysis combined with constitutive equations (9,10,11).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Thermal Fatigue Behaviour of Single-Crystal Nickel-Based Superalloys SRR 99 and CMSX-4

Meyer-Olbersleben¹,

Goldschmidt²,

Rézaï-Aria³

1992

Superalloys 1992 (Seventh International Symposium)

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Thermal fatigue (TF) behaviour in the low-modulus cool> direction of a new generation nickel-based single-crystal superalloy containing rhenium, CMSX-4 and a highly strengthened first generation one, SRR 99 is investigated. Both superalloys are subjected to comparative thermal fatigue testing. Thermal fatigue tests are performed on self-constraint single-edge wedge specimens. The transient mechanical strains within the thin edge tip of the TF specimens are measured and the anisothermal Manson-Coffin life curves are established. The effect of the maximum temperature, Tmax, in the thermal cycles is evaluated from 1100 to 1175°C. Under identical test conditions a comparable crack propagation rate is observed for both single-crystal alloys. CMSX-4 has a good resistance to oxide-scale spalling. In CMSX-4 cracks initiate from small pores which have formed during solidification in interdendritic regions. In SRR 99, crater-like regions from where the crack can initiate, are formed by a mechanism of successive oxide-scale spalling and re-oxidation of the base alloy. The higher resistance of the oxide-scale in CMSX-4 to spalling combined with the higher strength of the corresponding y depleted zone improves its TF crack initiation resistance in comparison with SRR 99.

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The Stress-Strain Behaviour of IN738LC under Thermomechanical Uni- and Multiaxial Fatigue Loading

Meersmann

Ziebs

Kühn

et al. 1996

Fatigue Under Thermal and Mechanical Loading: Mechanisms, Mechanics and Modelling

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Three Dimensional Thermal Strain and Stress Analysis of Single Edge Wedge Specimens

Cited by 3 publications

References 3 publications

The Determination of Hysteresis Loops in Thermo‐mechanical Fatigue Using Isothermal Stress‐strain Data

The Determination of Hysteresis Loops in Thermo‐mechanical Fatigue Using Isothermal Stress‐strain Data

Investigation of the Thermal Fatigue Behaviour of Single-Crystal Nickel-Based Superalloys SRR 99 and CMSX-4

The Stress-Strain Behaviour of IN738LC under Thermomechanical Uni- and Multiaxial Fatigue Loading

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