Research Papers: Materials and Fabrication

On Creep Fatigue Interaction of Components at Elevated Temperature

[+] Author and Article Information
Daniele Barbera

Department of Mechanical and
Aerospace Engineering,
University of Strathclyde,
Glasgow G1 1XJ, UK

Haofeng Chen

Department of Mechanical and
Aerospace Engineering,
University of Strathclyde,
Glasgow G1 1XJ, UK
e-mail: haofeng.chen@strath.ac.uk

Yinghua Liu

Department of Engineering Mechanics,
Tsinghua University,
Beijing 100084, China

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 26, 2015; final manuscript received December 4, 2015; published online April 28, 2016. Assoc. Editor: Marina Ruggles-Wrenn.

J. Pressure Vessel Technol 138(4), 041403 (Apr 28, 2016) (8 pages) Paper No: PVT-15-1134; doi: 10.1115/1.4032278 History: Received June 26, 2015; Revised December 04, 2015

The accurate assessment of creep–fatigue interaction is an important issue for industrial components operating with large cyclic thermal and mechanical loads. An extensive review of different aspects of creep fatigue interaction is proposed in this paper. The introduction of a high temperature creep dwell within the loading cycle has relevant impact on the structural behavior. Different mechanisms can occur, including the cyclically enhanced creep, the creep enhanced plasticity and creep ratchetting due to the creep fatigue interaction. A series of crucial parameters for crack initiation assessment can be identified, such as the start of dwell stress, the creep strain, and the total strain range. A comparison between the ASME NH and R5 is proposed, and the principal differences in calculating the aforementioned parameters are outlined. The linear matching method (LMM) framework is also presented and reviewed, as a direct method capable of calculating these parameters and assessing also the steady state cycle response due to creep and cyclic plasticity interaction. Two numerical examples are presented, the first one is a cruciform weldment subjected to cyclic bending moment and uniform high temperature with different dwell times. The second numerical example considers creep fatigue response on a long fiber reinforced metal matrix composite (MMC), which is subjected to a cycling uniform thermal field and a constant transverse mechanical load. All the results demonstrate that the LMM is capable of providing accurate solutions, and also relaxing the conservatisms of the design codes. Furthermore, as a direct method, it is more efficient than standard inelastic incremental finite element analysis.

Copyright © 2016 by ASME
Topics: Creep , Fatigue , Stress
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Fig. 1

Different material response due to cyclic loading with creep dwell period at the tensile peak

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Fig. 2

Creep ratchetting interaction boundary and creep ratchetting response due to creep stain (a) and plastic strain (b)

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Fig. 3

Type 304SS (595 °C) damage diagram for bilinear, linear, and combined damage rules [28,29]

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Fig. 4

Saturated steady state cycle with creep dwell at tensile peak

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Fig. 5

Geometry and finite element model of type 2 cruciform weldment [12]

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Fig. 6

Contour plots of LMM results for type 2 weldment corresponding to Δεtot = 1% and Δt = 5 hrs of dwell period [12]

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Fig. 7

MMC finite element model and loading conditions

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Fig. 8

Number of cycles to failure against creep dwell time for EPP and RO material models for a cycling temperature θ0 = 175 °C and constant mechanical load σp = 86.25 MPa

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Fig. 9

Creep–fatigue interaction diagram, fatigue and creep damage against dwell time plots for a uniform cycling temperature θ0 = 175 °C, and different constant mechanical loads at (a) 0 MPa, (b) 86.25 MPa, and (c) 172.5 MPa

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Fig. 10

Stress contours normalized by the yield stress at loading, creep, and unloading for a uniform cycling temperature θ0 = 175 °C and constant mechanical load σp = 172.25 MPa at different dwell times

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Fig. 11

Strain contours at loading, creep and unloading for a uniform cycling temperature θ0 = 175 °C and constant mechanical load σp = 172.25 MPa at different dwell times




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