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Creep–Fatigue Damage Evaluation of 2.25Cr-1Mo Steel in Process Reactor Using ASME-NH Code Methodology

  • Sagar R. DukareEmail author
  • Nilesh R. Raykar
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Critical equipment of nuclear power plants and petrochemical industries is sometimes subjected to both creep and fatigue loading simultaneously. Under combined creep–fatigue loading, the creep deformation affects the fatigue behavior of the material depending on the relative duration of stress relaxation due to creep within service life. In the present paper, evaluation of creep and fatigue damage is carried out for a process reactor using elastic analysis method of ASME-NH code. The reactor material is 2.25Cr-1Mo steel. The stress evaluations are carried out at outlet nozzle where stresses are observed to be maximum. Effect of three parameters, that is, the maximum hold temperature, the duration of hold time at highest temperature and the rate of temperature change on combined creep–fatigue damage, is studied. This work provides guidelines for performing creep–fatigue analysis for similar pressure components.

Keywords

ASME-NH Creep–fatigue interaction Creep ratcheting 2.25Cr-1Mo steel 

Nomenclature

D

Total creep–fatigue damage

K

Local geometric concentration factor

Ke

Stress ratio factor at yield

Kt

Factor for reduction in extreme fiber bending stress due to effect of creep

Kv

Multiaxial plasticity and Poisson ratio adjustment factor

Pb

Primary bending equivalent stress

PL

Local primary membrane equivalent stress

Pm

Primary membrane equivalent stress

(QR)max

Maximum secondary stress range

S*, \( \bar{S} \)

Stress indicators

Salt

Alternating stress intensity

Sj

Initial stress

Sm

Allowable stress

SrH

Hot relaxation strength

St

Temperature and time-dependent stress intensity limit

Sy

Yield strength of material

X

Primary stress parameter

Y

Secondary stress parameter

Z

Dimensionless effective creep stress parameter

Ɛmax

Maximum equivalent strain range

Ɛmod

Modified maximum equivalent strain range

Ɛc

Creep strain increment

Ɛt

Total strain range

σc

Effective creep stress

t

Duration of time interval

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Mechanical Engineering DepartmentSardar Patel College of EngineeringMumbaiIndia

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