Experimental Study on Mechanical Response of Polyethylene Pipe Subjected to Squeeze⁃off

doi:10.19491/j.issn.1001-9278.2021.11.015

Abstract

Abstract:

A systematic experimental study was conducted to investigate the effects of squeeze?off parameters， including squeezing speed， release speed， squeezing ratio， environment temperature， and pipe diameter on the mechanical response of PE pipes. The results indicated that the load in PE pipes increased with an increase in squeezing speed， squee?zing ratio， pipe diameter but a decrease in environment temperature. In addition， the residual deformation of PE pipes increased with an increase in unloading speed. Furthermore， the load decay during the stress relation stage increased with an increase in squeezing speed but a decrease in squeezing ratio， pipe diameter， and environmental temperature.

Key words: polyethylene, gas pipe, squeeze-off, mechanical response

CLC Number:

TQ 325.1⁺2

ZHANG Yi, QIAO Liang, FAN Junming, WEN Jiongming, SUN Lei, CAO Yuguang, LYU Shiwei. Experimental Study on Mechanical Response of Polyethylene Pipe Subjected to Squeeze⁃off[J]. China Plastics, 2021, 35(11): 97-103.

Figures/Tables 16

Fig.1. Squeeze?off test setup and schematic description of the squeezed pipe

Fig.2. Test procedure used in the squeeze?off tests

Fig.3. Load?displacement curves for PE pipe squeezed at various squeezing speeds

压管速度/mm?min^-1	0.01	0.1	1	10	100
载荷最大值/kN	21.06	24.19	26.69	27.85	32.51

Tab. 1. Maximum forces in PE pipe under various squeezing speed

Fig.4. Influence of squeezing speed on the stress relaxation behavior of PE pipe

Fig.5. Load?displacement curves for PE pipe squeezed to various squeezing ratios

压缩率/%	10	20	30
载荷最大值/kN	9.56	19.74	27.85

Tab.2. Maximum forces in PE pipe under various squeezing ratio

Fig.6. Load?displacement curves for PE pipe squeezed to various squeezing ratios

Fig.7. Load?displacement curves for PE pipe unloaded at various speeds

Fig.8. Load?displacement curves from PE pipe with different diameters

管径/mm	50	110	160	200
载荷最大值/kN	27.82	50.81	63.06	94.55

Tab. 3. Maximum forces in PE pipe with various diameters

Fig.9. Load?displacement curves for PE pipe squeezed to various squeezing ratios

Fig.10. Load?displacement curves for PE pipe squeezed at various environment temperatures

环境温度/°C	20	40	60	80
载荷最大值/kN	20.32	14.28	9.67	7.22

Tab. 4. Maximum forces in PE pipe under various loading temperatures

Fig.11. Load?displacement curves for PE pipe squeezed to various squeezing ratios

Fig.12. SEM location and the microstructures of PE pipe subjected to squeeze?off

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