Viscoelastic behavior and durability of steel wire - reinforced polyethylene pipes under a high internal pressure

2011 ◽  
Vol 47 (2) ◽  
pp. 193-202
Author(s):  
S. G. Ivanov ◽  
A. N. Anoshkin ◽  
V. Yu. Zuyko
Keyword(s):  
Internal Pressure ◽  
Steel Wire ◽  
Viscoelastic Behavior ◽  
Polyethylene Pipes ◽  
High Internal Pressure

Study on steel wire reinforced thermoplastic pipes under combined internal pressure and bending moment at various temperatures

2021 ◽  
Vol 169 ◽  
pp. 108381
Author(s):  
Jianfeng Shi ◽  
Sijia Zhong ◽  
Xinyu Nie ◽  
Jun Shi ◽  
Jinyang Zheng
Keyword(s):  
Internal Pressure ◽  
Steel Wire ◽  
Bending Moment

Towards the Development of Filament Wound Composite Structures Submitted to Very High Internal Pressure, Based on Complex Geometry Shapes

2013 ◽  
Author(s):  
Erik Vargas Rojas ◽  
David Chapelle ◽  
Dominique Perreux
Keyword(s):  
Internal Pressure ◽  
Composite Structures ◽  
Complex Geometry ◽  
Industrial Applications ◽  
Filament Winding ◽  
Complex Geometries ◽  
Filament Wound ◽  
Complex Shapes ◽  
Filament Wound Composite ◽  
High Internal Pressure

Industrial applications, especially composite structures bearing high internal pressure, and fabricated using the filament winding process face certain difficulties like the reinforcement of complex shapes, as well as the correct placement of fibers over the surface of a mandrel. In some cases the definition of the manufacturing parameters respond more to cost or time criteria rather than engineering standards, reducing largely the advantages of the said manufacturing process. In order to overcome these obstacles, this research aims to propose a solution that permits to fabricate complex shapes with the desired winding angles at a certain region of complex-shaped mandrels. A numerical tool that simulates the placement of fiber tows over the surface of complex geometries is developed and validated by means of the fabrication of convex and concave composite structures using detachable mandrels. Previous results show that it is feasible to wind complex geometries with good accuracy.

scholarly journals Structure and Function in the Nematodes: Internal Pressure and Cuticular Structure in Ascaris

1957 ◽  
Vol 34 (1) ◽  
pp. 116-130 ◽  
Author(s):  
J. E. HARRIS ◽  
H. D. CROFTON
Keyword(s):  
Internal Pressure ◽  
Direct Method ◽  
Pressure Gauge ◽  
Longitudinal Axis ◽  
Mean Value ◽  
Mechanical Factors ◽  
And Function ◽  
Longitudinal Muscles ◽  
High Internal Pressure ◽  
A Direct Method

1. Experimental determinations of the hydrostatic pressure in the pseudocoel of living Ascaris lumbricoides were made by a direct method, using a glass helix pressure gauge and by an indirect method using an indentation gauge, both of which are described. 2. The mean value of this pressure was 70 mm. Hg (95 cm. of water), and showed wide and often rhythmical variations from 16 mm. to as high as 225 mm. Hg. Observations on the behaviour of artificially distended worms and of the tension developed by the muscles confirm these results. 3. The mechanical structure of the cuticle, with its inextensible spiral fibrils, forming a basketwork at an angle of 75° to the longitudinal axis, provides for an anisometric expansion and contraction under the action of the longitudinal muscles which is closely in accordance with the observed changes in volume and length. 4. A discussion of the significance of this mechanism and of the high internal pressure suggests that the great similarity of form among nematodes is determined to a considerable extent by mechanical factors.

scholarly journals Self-assembled nanocapsules in water: a molecular mechanistic study

2017 ◽  
Vol 19 (31) ◽  
pp. 20377-20382
Author(s):  
Hang Xiao ◽  
Xiaoyang Shi ◽  
Xi Chen
Keyword(s):  
Carbon Nanotubes ◽  
Drug Delivery ◽  
Internal Pressure ◽  
Mechanistic Study ◽  
Potential Applications ◽  
Self Assembled ◽  
High Internal Pressure ◽  
Very High

One-end-open carbon nanotubes with an appropriate radius difference can coaxially self-assemble into a nanocapsule with very high internal pressure (on the order of 1 GPa), underpinning potential applications in nano-reactors, drug-delivery, etc.

Long-Term Stress Analysis of Plastic Pipe Reinforced by Cross-Winding Steel Wire

2008 ◽  
Author(s):  
Xiang Li ◽  
Jinyang Zheng ◽  
Yaxian Li ◽  
Ping Xu ◽  
Chunying Zheng ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Volume Fraction ◽  
Axial Strain ◽  
Steel Wire ◽  
Creep Behaviour ◽  
Viscoelastic Model ◽  
Time Dependent ◽  
Hoop Strain ◽  
Steel Wires ◽  
Plastic Pipe

Plastic pipe reinforced by cross helically wound steel wires (PSP) is a new type of metal-plastics composite pipe developed in China. Time-dependent properties of PSP are investigated theoretically and experimentally in this paper. Although the steel wire can carry most of the loading in a liner elastic way, the time dependent behavior shown in the PSP should be further analyzed and described. Based on the structural features of PSP and the viscoelastic behaviors of HDPE in matrix, a three layer viscoelastic model is proposed to calculate time-dependent elastic stresses and strains in the PSP subjected to internal pressure. The experimental results show that the hoop strain decreases slowly, while the axial strain increases by 0.16% in 14000 minutes at constant internal pressure. Good agreement between theoretical results and experimental data shows that the three layer viscoelastic model is able to predict the time-dependent relationship of stress and strain in PSP. The effects of volume fraction and winding angle of the steel wires on the creep behaviour of the PSP subjected to an internal pressure are discussed in the end.

Single-walled carbon nanotubes as high pressure nanocontainer

2014 ◽  
Vol 28 (14) ◽  
pp. 1450074 ◽  
Author(s):  
Na Chen ◽  
Qing Xu ◽  
Xiang Ye
Keyword(s):  
Carbon Nanotubes ◽  
High Pressure ◽  
Internal Pressure ◽  
Single Walled Carbon Nanotubes ◽  
Elastic Model ◽  
Single Walled Carbon ◽  
Size Dependent ◽  
Bond Stretching ◽  
Walled Carbon Nanotubes ◽  
High Internal Pressure

The single-walled carbon nanotubes (SWCNTs) under high internal pressure are studied by the constant-pressure molecular dynamics method. The results show that SWCNTs are suitable candidates for high pressure nanocontainer, and they can resist 30 GPa to 110 GPa internal pressure. We find that the ultimate internal pressure that nanotubes can sustain is mainly determined by the radius of the tube, and it is not sensitive to the tube chirality. The breaking of the nanotube induced by high internal pressure is mainly due to bond stretching rather than bond angle changing. An elastic model is used to explain the size-dependent ultimate internal pressure behavior for SWCNTs.

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