Bithermal low‐cycle fatigue evaluation of automotive exhaust system alloy SS409

Lu, Guoguang; Behling, M.; Halford, Gary R.

doi:10.1046/j.1460-2695.2000.00310.x

Cited by 4 publications

(1 citation statement)

References 5 publications

(17 reference statements)

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“…Although this work focuses on a specific copper alloy, the suggested procedure can be also extended to other applications with thermo-mechanical loads. [5][6][7][8] 2 | EXPERIMENTAL TESTING A CuAg alloy, classified in ASTM B 124, 9 was tested under isothermal low-cycle fatigue tests at 3 temperatures: room temperature (RT), 250°C, and 300°C. The latter 2 temperatures were chosen as they represent the typical range in the inner surface of continuous casting CuAg moulds operating in service.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterisation of a CuAg alloy for thermo‐mechanical applications. Part 2: Design strain‐life curves estimated via statistical analysis

Benasciutti

Novak

Moro

et al. 2018

Fatigue Fract Eng Mat Struct

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Strain‐life fatigue data on copper alloys, especially type CuAg, are seldom available in the literature. This work fills this gap by estimating the strain‐life curves of a CuAg alloy used for thermo‐mechanical applications, from isothermal low‐cycle fatigue tests at 3 temperatures (room temperature, 250°C, 300°C). Regression analysis is used to estimate the median fatigue curves at 50% survival probability. The comparison of median curves with the Universal Slopes Equation model, calibrated on monotonic tensile properties, shows a fairly good agreement. Design strain‐life curves with a lower failure probability and given confidence are estimated by several approximate statistical methods (“Equivalent Prediction Interval,” univariate tolerance interval, Owen's tolerance interval for regression). When higher survival probabilities are considered, the results show a marked decrease in the allowable design strain at a prescribed fatigue life. The suggested procedure thus improves the durability analysis of components loaded thermo‐mechanically.

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Section: Introductionmentioning

confidence: 99%

Experimental characterisation of a CuAg alloy for thermo‐mechanical applications. Part 2: Design strain‐life curves estimated via statistical analysis

Benasciutti

Novak

Moro

et al. 2018

Fatigue Fract Eng Mat Struct

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High Temperature Creep-Fatigue Behavior of 25Cr-13Ni Stainless Steel

Song¹,

Ahn²

2015

Journal of the Korean Society for Heat Treatment

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The low cycle fatigue (LCF) and creep-fatigue (hold time tension fatigue, HTTF) tests were performed on the modified 25Cr-13Ni cast stainless steel, which was selected as a candidate material for exhaust manifold in automotive engine. The exhaust manifold is subjected to an environment in which heating and cooling cycle occur due to the running pattern of automotive engine. Several types of fatigue behaviour such as thermal fatigue, thermal mechanical fatigue and creep-fatigue are belong to the main failure mechanisms. High temperature tensile test was firstly carried out to compare the sample with the traditional cast steel for the component. The low cycle fatigue and HTTF tests were carried out under the strain controlled condition with the total strain amplitude from ± 0.6% to ± 0.7% at 800 o C. The hysteresis loops of HTTF tests showed significant stress relaxation during tension hold time. With the increase of tension hold time, the fatigue life was remarkably deceased which caused from the formation of intercrystalline crack by the creep failure mechanism.

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Total Strain-Based Strain-Range Partitioning—Isothermal and Thermomechanical Fatigue

2009

Fatigue and Durability of Metals at High Temperatures

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This chapter explains why it is sometimes necessary to separate inelastic from elastic strains and how to do it using one of two methods. It first discusses the direct calculation of strain-range components from experimental data associated with large strains. It then explains how the method can be extended to the treatment of very low inelastic strains by adjusting tensile and compressive hold periods and continuous cycling frequencies. The chapter then begins the presentation of the second approach, called the total strain-range method, so named because it combines elastic and inelastic strain into a total strain range. The discussion covers important features, procedures, and correlations as well as the use of models and the steps involved in predicting thermomechanical fatigue (TMF) life. It also includes information on isothermal fatigue, bithermal creep-fatigue testing, and the predictability of the method for TMF cycling.

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Bithermal low‐cycle fatigue evaluation of automotive exhaust system alloy SS409

Abstract: Abstract

Cited by 4 publications

References 5 publications

Experimental characterisation of a CuAg alloy for thermo‐mechanical applications. Part 2: Design strain‐life curves estimated via statistical analysis

Experimental characterisation of a CuAg alloy for thermo‐mechanical applications. Part 2: Design strain‐life curves estimated via statistical analysis

High Temperature Creep-Fatigue Behavior of 25Cr-13Ni Stainless Steel

Total Strain-Based Strain-Range Partitioning—Isothermal and Thermomechanical Fatigue

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