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Research Papers: Materials and Fabrication

Evaluation of Fracture Toughness Behavior of Polyethylene Pipe Materials1

[+] Author and Article Information
Tarek M. A. A. EL-Bagory

Assistant Professor
Department of Mechanical and
Industrial Engineering,
College of Engineering,
Majmaah University,
P.O. Box 66,
Majmaah, Riyadh 11952,
Saudi Arabia
Department of Mechanical Design,
El-Mataria Helwan University,
Cairo El-Mataria, 11724, Egypt
e-mail: telbagory@yahoo.com

Hossam E. M. Sallam

Professor
Department of Civil Engineering,
Jazan University,
P.O. Box 706,
Jazan 45142, Saudi Arabia
Materials Engineering Department,
Zagazig University,
Zagazig 44519, Egypt
e-mail: hem_sallam@yahoo.com

Maher Y. A. Younan

Associate Dean
School of Sciences and Engineering,
The American University in Cairo,
Cairo 11835, Egypt
e-mail: myounan@aucegypt.edu

Proceedings of the ASME 2014 Pressure Vessels and Piping Division/K-PVP Conference PVP 2014, Anaheim, CA, July 20–24, Paper No. PVP2014-28407.

Pipes & Plastic Products Company (PPP) in the 10th of Ramadan City-Egypt.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 3, 2014; final manuscript received January 23, 2015; published online April 16, 2015. Assoc. Editor: Pierre Mertiny.

J. Pressure Vessel Technol 137(6), 061402 (Dec 01, 2015) (10 pages) Paper No: PVT-14-1056; doi: 10.1115/1.4029925 History: Received April 03, 2014; Revised January 23, 2015; Online April 16, 2015

The main purpose of the present paper is to investigate the effect of crosshead speed, specimen thickness, and welding on the fracture toughness. The material of the investigated pipe is a high density polyethylene (HDPE), which is commonly used in natural gas piping systems. The welding technique used in this study is butt-fusion (BF) welding technique. The crosshead speed ranged from 5 to 500 mm/min and specimen thickness ranged from 9 to 45 mm for both welded and unwelded specimens at room temperature, Ta = 20 °C. Curved three point bend (CTPB) specimens were used to determine KQ. Furthermore, the results of fracture toughness, KQ, will be compared with the plane–strain fracture toughness, JIC, for welded and unwelded specimens. The experimental results revealed that KQ increases with increasing the crosshead speed, while KQ decreases as the specimen thickness increases. The investigation reveals that the apparent fracture toughness, KQ, for HDPE pipe of unwelded specimen is greater than that of corresponding value for welded specimen. The same trend was observed for the plane-strain fracture toughness, JIC. At lower crosshead speeds there is a minimum deviation in KQ between welded and unwelded specimens, while the deviation becomes larger with increasing crosshead speed.

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References

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Figures

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Fig. 1

BF welding process according to Refs. [20-22]

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Fig. 2

Configuration of (a) CTPB specimen according to Ref. [23] and (b) ring cut into five 72 deg sectors

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Fig. 3

Crack geometry and razor blade configurations

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Fig. 4

Schematic illustration of (a) double cantilever clip—in displacement gauge [23] and (b) pictorial view of clip gauge and attached with CTPB test specimen

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Fig. 5

Determination of P5 and PQ [23,26]

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Fig. 6

Measuring system used to determine KIC

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Fig. 7

Load–COD for unwelded CTPB specimen at thickness 10 mm and different crosshead speeds

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Fig. 8

Apparent fracture toughness as a function of crosshead speed for unwelded CTPB specimen at thickness 10 mm

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Fig. 9

Apparent fracture toughness as a function of crosshead speed for unwelded CTPB at different B/W ratios

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Fig. 10

Apparent fracture toughness as a function of specimen thickness for unwelded CTPB at different crosshead speeds

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Fig. 11

Load–COD for welded CTPB specimen at thickness 22.5 mm and different crosshead speeds

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Fig. 12

Apparent fracture toughness as a function of crosshead speed for welded CTPB specimen at thickness 22.5 mm

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Fig. 13

Apparent fracture toughness as a function of crosshead speed for welded CTPB specimen at different B/W ratios

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Fig. 14

Apparent fracture toughness as a function of specimen thickness for welded CTPB specimen at different crosshead speeds

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Fig. 15

Apparent fracture toughness ratio between welded and unwelded specimen at different crosshead speeds

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Fig. 16

Apparent fracture toughness ratio between welded and unwelded specimen at different B/W ratios

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