scholarly journals SELECTING AN ALTERNATIVE STEEL MATERIAL FOR PRODUCTS WHICH STAND HIGH INTERNAL PRESSURE

2020 ◽  
Vol 04 (11) ◽  
pp. 329-333
Author(s):  
Hashim Adam Omer Ali ◽  
M.I Shukri
Keyword(s):  
Internal Pressure ◽  
Steel Material ◽  
High Internal Pressure

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.

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.

Effect of Pressurization on the Buckling Behavior of Thin-Walled Cylinders Under Bending Load

2009 ◽  
Author(s):  
Ali Limam ◽  
Ce´dric Mathon
Keyword(s):  
Experimental Investigation ◽  
Internal Pressure ◽  
Axial Compression ◽  
Load Capacity ◽  
Combined Loads ◽  
Plasticity Effect ◽  
Buckling Behavior ◽  
Bending Load ◽  
Thin Walled ◽  
High Internal Pressure

This study deals with the buckling of thin cylindrical shells submitted to combined loads such internal pressure, bending and axial compression. A large experimental investigation is conducted and some explanations on the behavior of such loaded structures and on the influence of distinct parameters are gauged. The parametrical studies show the stabilising effect of low internal pressure and a drop of the load capacity for high internal pressure due to the plasticity effect. Specific recommendations are finally established for the design.

Tensile Strain Capacity of X80 Pipeline Under Tensile Loading With Internal Pressure

2010 ◽  
Author(s):  
Satoshi Igi ◽  
Takahiro Sakimoto ◽  
Nobuhisa Suzuki ◽  
Ryuji Muraoka ◽  
Takekazu Arakawa
Keyword(s):  
Internal Pressure ◽  
Driving Force ◽  
Tensile Strain ◽  
Surface Defects ◽  
Axial Loading ◽  
Element Analysis ◽  
Crack Driving Force ◽  
Strain Capacity ◽  
High Internal Pressure ◽  
Tensile Strain Capacity

This paper presents the results of experimental and finite element analysis (FEA) studies focused on the tensile strain capacity of X80 pipelines under large axial loading with high internal pressure. Full-pipe tensile test of girth welded joint was performed using high-strain X80 linepipes. Curved wide plate (CWP) tests were also conducted to verify the strain capacity under a condition of no internal pressure. The influence of internal pressure was clearly observed in the strain capacity. Critical tensile strain is reduced drastically due to the increased crack driving force under high internal pressure. In addition, SENT tests with shallow notch specimens were conducted in order to obtain a tearing resistance curve for the simulated HAZ of X80 material. Crack driving force curves were obtained by a series of FEA, and the critical global strain of pressurized pipes was predicted to verify the strain capacity of X80 welded linepipes with surface defects. Predicted strain showed good agreement with the experimental results.

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