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research-article

Fracture behavior simulation of a high-pressure vessel under monotonic and fatigue loadings

[+] Author and Article Information
Defu Nie

Hefei General Machinery Research Institute, Hefei 230031, China; Department of System Safety, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka-shi 940-2188, Japan
dove_ndf@sina.com

Yuichi Otsuka

Department of System Safety, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka-shi 940-2188, Japan
otsuka@vos.nagaokaut.ac.jp

Yoshiharu Mutoh

Department of System Safety, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka-shi 940-2188, Japan
mutoh@mech.nagaokaut.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4040275 History: Received December 10, 2017; Revised May 08, 2018

Abstract

Fracture behavior of a high-pressure vessel for food processing under monotonic and fatigue loadings was investigated by conducting both experiments and finite element analysis (FEA) based on ABAQUS and ZENCRACK software. FEA results showed that cracks nucleated at the fillets of pin-hole and propagated faster near the inner surface than near the outer surface of the pressure vessel, progressively deflected and eventually coalesced with other cracks initiated from the counter pin hole under monotonic loading. Such crack growth behavior coincided with the experimental result of hydraulic pressurizing test. Based on fatigue crack growth test of the pressure vessel material, 17-4PH stainless steel, a new equation to express the da/dN-delta K curves including threshold region has been proposed and embedded into the ZENCRACK software to simulate the fatigue behavior of the pressure vessel. The simulation results showed that fatigue lives could be accurately estimated including low pressure range. The present simulation methods would be the useful design tool for pressure vessel under monotonic and cyclic loadings.

Copyright (c) 2018 by ASME
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