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Research Papers: Materials and Fabrication

Fatigue Performance Evaluations of Vehicle Toroidal Liquefied Petroleum Gas Fuel Tanks

[+] Author and Article Information
Fuat Kartal

Engineering and Architecture Faculties,
Mechanical Engineering Department,
Kastamonu University,
Kuzeykent/Kastamonu 37100, Turkey
e-mail: fuatkartal81@hotmail.com

Yasin Kisioglu

Biomechanics,
Faculty of Technology,
Biomedical Engineering,
Kocaeli University,
Kocaeli 41380, Turkey,
e-mail: ykisioglu@kocaeli.edu.tr

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 13, 2015; final manuscript received December 25, 2016; published online March 17, 2017. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 139(4), 041402 (Mar 17, 2017) (8 pages) Paper No: PVT-15-1268; doi: 10.1115/1.4035976 History: Received December 13, 2015; Revised December 25, 2016

In this study, fatigue performances of the vehicle toroidal liquefied petroleum gas (LPG) fuel tanks were examined to estimate the fatigue life and its failure locations using both experimental and finite element analysis (FEA) methods. The experimental investigations performed as accelerated fatigue tests were carried out using a hydraulics test unit in which the tanks were internally pressurized by hydraulic oil. The LPG tanks were subjected to repeated cyclic pressure load varying from zero to service pressure (SP) of the tank. The computerized FEA modeling of these tanks were developed in three-dimensional (3D) form using nonuniform geometrical parameters and nonlinear material properties. These models were also subjected to zero-based high cycle fatigue pressure load considering the stress life approach. The FEA modeling process was also simulated in nonhomogeneous material conditions. Therefore, the fatigue life performance and failure location of the toroidal LPG fuel tanks were predicted using the computer-aided simulations and compared with the experimental results.

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Figures

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Fig. 1

The vehicle toroidal LPG fuel tank and its design parameters

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Fig. 2

(a) Fatigue test equipments and (b) circuit diagram of the hydraulic system. 1, filter; 2, AC motor and hydraulic pump; 3, pressure gauge; 4, pressure relief valve; 5, check valve; 6, servohydraulic valve; 7, cycle counter; 8, the LPG tanks.

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Fig. 3

Results of the accelerated fatigue tests

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Fig. 4

The fatigue failure locations of the torus tanks

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Fig. 5

The torispherical LPG tank: (a) 3D solid model and (b) FEA model

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Fig. 6

Orientations of the tensile test specimens and material properties of the toroidal LPG tank

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Fig. 7

The S–N curve of the torus tank material

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Fig. 8

Thickness variation of the toroidal LPG fuel tanks

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Fig. 9

The applied zero-based repeated pressure loading

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Fig. 10

(a) Fatigue life and (b) safety factor for the LPG tank

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Fig. 11

The equivalent static stress distributions

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Fig. 12

Structural behavior of the LPG tank for selected nodes

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