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Research Papers

Application of a Composite Model in the Analysis of Creep Deformation at Low and Intermediate Temperatures

[+] Author and Article Information
Xinjun Yang

Jiangsu Key Laboratory of Advanced Food
Manufacturing Equipment and Technology,
School of Mechanical Engineering,
Jiangnan University,
Wuxi 214122, Jiangsu, China
e-mail address: xinjun_yang@163.com

Xiang Ling

Jiangsu Key Laboratory of Process Enhancement
and New Energy Equipment Technology,
School of Mechanical and Power Engineering,
Nanjing Tech University,
Nanjing 211816, Jiangsu, China

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received April 5, 2017; final manuscript received June 22, 2017; published online August 3, 2017. Assoc. Editor: Vikas Tomar.

J. Eng. Mater. Technol 139(4), 041013 (Aug 03, 2017) (6 pages) Paper No: MATS-17-1098; doi: 10.1115/1.4037312 History: Received April 05, 2017; Revised June 22, 2017

The creep behaviors of TA2 and R60702 at low and intermediate temperature were presented and discussed in this paper. Experimental results indicated that an apparent threshold stress was exhibited in the creep deformation of R60702. Meanwhile, the primary creep phase was found as the main pattern in the room temperature creep behavior of TA2. Compared with the exponential law, the power law has been proved to be a proper constitutive model in the description of primary creep phase. It also showed that θ projection method had its significant advantage in the evaluation of accelerated creep stage. Thus, a composite model which combined power law with θ projection method was applied in the creep curves evaluation at low and intermediate temperature. Based on the multiaxial creep deformation results, the model was modified and discussed. A linear relationship existed between composite model parameters and applied load. Finally, the creep life of TA2 and R60702 could be accurately predicted by the composite model, and it is suitable for the application in low and intermediate temperature creep life analysis.

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Figures

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Fig. 1

The creep strain–time curves of TA2 at room temperature

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Fig. 2

The creep strain–time curves of R60702 at 473 K

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Fig. 3

Analysis of primary creep phase (a) TA2 at 300 MPa; analysis of primary creep phase (b) TA2 at 270 MPa; analysis of primary creep phase (c) R60702 at 145 MPa

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Fig. 4

Fitting results of composite creep model for R60702 at 473 K

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Fig. 5

Fitting results of composite creep model for nanosilver lap shear joints at 600 K

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Fig. 6

The relationship between material parameters of composite model and stress

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Fig. 7

The creep deflection–time curves of R60702 at different temperatures and loads

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Fig. 8

Deformation model of round specimen in the multiaxial deformation status

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Fig. 9

Fitting results of composite creep model for multiaxial creep results of R60702

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