Research Papers: Materials and Fabrication

Plastic Deformation Influence on Material Properties of Autofrettaged Tubes Used in Diesel Engines Injection System

[+] Author and Article Information
K. Aliakbari

Department of Mechanical Engineering,
Ferdowsi University of Mashhad,
Mashhad 9177948944, Iran
e-mail: karimaliakbari@yahoo.com

Kh. Farhangdoost

Department of Mechanical Engineering,
Ferdowsi University of Mashhad,
Mashhad 9177948944, Iran
e-mail: farhang@um.ac.ir

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 7, 2013; final manuscript received January 7, 2014; published online April 3, 2014. Assoc. Editor: Mordechai Perl.

J. Pressure Vessel Technol 136(4), 041402 (Apr 03, 2014) (6 pages) Paper No: PVT-13-1109; doi: 10.1115/1.4026452 History: Received July 07, 2013; Revised January 07, 2014

According to the DIN2391 standard, the DIN1.0406 steel is used to manufacture high-pressure injection tubes of diesel engines. The parts are autofrettaged during the manufacturing process to increase operating pressure and fatigue life. The autofrettage process is affected by loading–unloading cycle. In Bauschinger effect (BE) phenomenon, plastic deformation causes a loss in unloading yield strength. The ratio of unloading yield strength to the loading yield strength is called Bauschinger effect factor, BEF. In this paper, plastic deformation influence on the loading and unloading behaviors of DIN1.0406 steel is studied considering the BE. Uniaxial tension–compression experimental data are used to figure out a suitable model to study the BE. To carry out these experiments, a servohydraulic Instron machine is used. The sample tubes having inside diameter of 2.4 mm and outside diameter of 6 mm were made based on the standard ASTM E8M-97a. The tests were carried out using the total strain of 4.31%. Another important purpose of this paper is to investigate the effect of the amount of plastic strain on loading–unloading Young's modulus. Finally, the behavior of DIN1.0406 steel is compared with the steels such as DIN1.6959, HY 180, and PH 13-8Mo used in tubes.

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Fig. 1

(a) Servohydraulic Instron machine and (b) a typical extensometer

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Fig. 2

Engineer stress–strain curves of DIN1.0406 steel

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Fig. 3

The uniaxial stress–strain curve describing the material behavior in loading–unloading

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Fig. 4

Experimental results and numerical fits for normalized unloading Young's modulus in DIN1.0406 steel

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Fig. 5

Normalized unloading Young's modulus; comparison between the DIN1.0406 and the three DIN1.6959 [10], HY 180, and PH 13-8Mo [9]

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Fig. 6

BEF of DIN1.0406 steel versus initial plastic strain; comparison between different amount of offset and proposed fits

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Fig. 7

The changes in BEF against plastic strain having the offset of 0.01%; comparing the DIN1.0406 and DIN1.6959 steels

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Fig. 8

The changes in the BEF versus plastic strain having the offset of 0.05%; comparison between DIN1.0406, DIN1.6959, HY 180, and PH 13-8Mo steels

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Fig. 9

The mathematical complete model of DIN1.0406 steel; the comparison between the results of experimental and proposed fits




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