Research Papers: Materials and Fabrication

Visualization of Thermal Fatigue Damage Distribution With Simplified Stress Range Calculations

[+] Author and Article Information
Junya Miura

Graduate School of Science and Engineering,
Course of Advanced Mechatronics Systems,
Toyo University,
2100 Kujirai,
Kawagoe 350-8585, Saitama, Japan
e-mail: s36a01700082@toyo.jp

Terutaka Fujioka

Faculty of Science and Engineering,
Department of Mechanical Engineering,
Toyo University,
2100 Kujirai,
Kawagoe 350-8585, Saitama, Japan
e-mail: fujioka@toyo.jp

Yasuhiro Shindo

Faculty of Science and Engineering,
Department of Mechanical Engineering,
Toyo University,
2100 Kujirai,
Kawagoe 350-8585, Saitama, Japan
e-mail: shindo060@toyo.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received November 9, 2017; final manuscript received July 11, 2018; published online November 12, 2018. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 140(6), 061403 (Nov 12, 2018) (7 pages) Paper No: PVT-17-1225; doi: 10.1115/1.4041057 History: Received November 09, 2017; Revised July 11, 2018

This paper proposes simplified methods to evaluate fatigue damage in a component subjected to cyclic thermal loads to visualize damage distribution by using typical computer-aided engineering systems. The objective is to perform the evaluations on a standard desktop PC within a reasonably short computation time. Three simplified methods for defining elastic stress ranges are proposed in place of the method in the ASME Subsection NH procedures. A thermal fatigue test that was previously performed using a type-304 stainless steel (304SS) cylinder is simulated to validate the proposed methods. Heat transfer and elastic analyses are conducted. Simultaneously with the analyses, fatigue usage factors are calculated using user subroutines formulated in this study, including the three simplified methods and the ASME NH-based method. The calculated values of the fatigue usage factor are visualized using a graphical user interface (GUI) incorporated into a commercial finite-element analysis (FEA) code. The fatigue usage factor distribution obtained using the simplified methods could be calculated without requiring large amounts of memory and long computation time. In addition, the distribution of the fatigue usage factor was consistent with the distribution of cracks observed in the test.

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Fig. 5

FEA model and mechanical boundary conditions

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Fig. 3

Sodium temperature history at specimen inlet

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Fig. 2

Temperature histories at two evaluation points

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Fig. 1

Dimensions and configuration of specimen

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Fig. 6

Flowchart of stress range calculation using methods 1(a) and 2(b): (a) method 1 and (b) method 2

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Fig. 14

Comparison between crack observations [1] and calculated fatigue usage factor

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Fig. 11

Distribution of elastic stress range calculated using three proposed simplified methods: (a) method 1, (b) method 2, and (c) method 3

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Fig. 12

Comparison between crack observations [1] and present elastic analysis results

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Fig. 13

Distributions of fatigue usage factors calculated using four methods: (a) ASME NH-based method, (b) method 1, (c) method 2, and (d) method 3

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Fig. 7

Results of heat transfer analysis compared with measured temperatures [1]

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Fig. 8

Temperature distribution at 120 s after start of rapid heating

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Fig. 9

Stress histories on inner surface at point of maximum thickness: (a) rapid heating and (b) rapid cooling

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Fig. 10

Distribution of equivalent of von Mises stress at 80 s after start of rapid heating



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