Stress distribution and pressure-bearing capacity of a high-pressure split-cylinder die with prism cavity

2018 ◽  
Vol 89 (3) ◽  
pp. 035106
Author(s):  
Liang Zhao ◽  
Mingzhe Li ◽  
Liyan Wang ◽  
Erhu Qu ◽  
Zhuo Yi
Keyword(s):  
High Pressure ◽  
Stress Distribution ◽  
Bearing Capacity

Research on Hole Making Mechanism of High Pressure Hydraulic Perforation

2014 ◽  
Vol 590 ◽  
pp. 96-100 ◽  
Author(s):  
Hai Cheng Li ◽  
Xu Jing Zhang ◽  
Fu Min Liang
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Stress Distribution ◽  
Tensile Stress ◽  
Water Jet ◽  
Rock Fragmentation ◽  
Rock Stress ◽  
Element Simulation ◽  
Pressure Water ◽  
High Pressure Water Jet

In this paper, we integrated use hydraulics, seepage flow mechanics, rock mechanics, and finite element simulation analysis and other methods to study the rock fragmentation mechanism of high pressure water jet. We make tensile stress - crack expansion comprehensive rock fragmentation model for the screw drilling of high pressure water jet. We make finite element simulation according to the mechanism of integrated model of high pressure water jet process, to analysis the internal rock stress distribution and external rock stress distribution of the fluid, and come to the reasonable number of high-pressure water jet nozzle hole. It is verified by the high pressure water jet breaking rock inside experiments of tensile stress - comprehensive rock fragmentation fracture expansion model, summarizes the law of high pressure water jet breaking rock, and we get to know reasonable drilling mode of the high pressure water jet is screw drilling with pitch of 120mm. At present there are two main types of the micro mechanism of the high pressure water jet. One is stress and tensile damage, because of the action produced by stress wave of the high pressure water jet impacting on rock, which mainly makes the tensile failure of rock; another one is crack expansion damage, under the effect of quasi static pressure radiation of water jet, the coupling effect between water shooting jet and rock pore skeleton, which make the rock pore, throat, and micro cracks expanding gradually, eventually the macro damage.

Squeezed Under the Sheet: White Mica Records High Tectonic Stresses Within a Decollement Thrust

2020 ◽  
Author(s):  
Miisa Häkkinen ◽  
Samuel Angiboust ◽  
Benoit Dubacq ◽  
Martine Simoes
Keyword(s):  
High Pressure ◽  
Stress Distribution ◽  
White Mica ◽  
Tectonic Stresses ◽  
Paleozoic Basement ◽  
Thrust Zone ◽  
High Silica ◽  
Basement High ◽  
Orogenic Belts ◽  
Se France

<p>Tectonic stresses at the base of decollement thrusts are generally expected to be low due to the presence of mechanically weak evaporites. Yet, the presence of abundant micro-seismicity in the region expected to correspond to the evaporitic layer remains paradoxical. We study here a fossil thrust zone from the base of the Digne nappe (SE France) where exotic thrust slices formed by brecciated Paleozoic basement micaschists are observed within the Mio-Pliocene decollement. Petrographic investigations reveal the presence of highly-substituted phengitic rims (up to Si=3.43 apfu) around pre-alpine muscovitic cores. Similar micaschists sampled in a basement high further North do not exhibit these phengitic rims around muscovite, thus suggesting that white mica zoning relates to a younger overprint. Such high-Silica phengites are commonly found in high-pressure terranes (i.e. 7-15 kbars depending on the buffering assemblage) but are not expected in foreland regions, such as in the Digne area where the overburden has never been thicker than c.5km (i.e. approximately 1.3 kbar). We propose that the mica zoning observed reflects the former presence of non-lithostatic stresses (possibly on the order of several kilobars) related to the elastic charging of a thrust slice “squeezed” at the base of the moving nappe. This finding sheds light on stress distribution as well as on the origin of micro-seismicity along active decollement thrusts in orogenic belts.</p>

Numerical Simulation on the Stress Characteristics of Prestressed Retaining Wall

2013 ◽  
Vol 477-478 ◽  
pp. 596-599
Author(s):  
Jian Qing Wu ◽  
Hong Bo Zhang ◽  
Xiu Guang Song ◽  
Yi Fan Yu ◽  
Chao Li
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Bearing Capacity ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Lateral Earth Pressure ◽  
Prestressed Anchor

With the highway subgrade fill increasing, traditional retaining wall cannot meet the requirements for supporting. To meet this requirement, the prestressed opposite-pull retaining wall was put forward. Due to the anchor pull of the new-style retaining wall, its bearing capacity was enhanced, but the stress is not clear. In order to reveal the stress distribution of the prestressed opposite-pull retaining wall, FLAC3D was adept to do numerical simulation on the new-style retaining wall. It simulated three conditions of the wall with no anchor, with anchor but without prestress and with prestressed anchor. The results showed that, after the layout of prestressed anchor, the lateral earth pressure of the region near the anchor increased with the increase of prestress, the lateral earth pressure of the wall is parabola distribution. The lateral earth pressure was larger than that of the wall with no anchor and with anchor but without prestress. The bearing capacity of the retaining wall was effectively improved.

scholarly journals Development of an Optimal Relief Method for the Palatal Plate by Stress Analysis

2021 ◽  
Author(s):  
Tomoko Mukai ◽  
Yuji Sato ◽  
Osamu Shimodaira ◽  
Junichi Furuya ◽  
Akio Isobe ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Bearing Capacity ◽  
Stress Analysis ◽  
Three Dimensional ◽  
Distribution Volume ◽  
Palatal Plate ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Palatal Mucosa

Abstract Background: A maxillary-palate-shaped device for simultaneous measurement of bite force and palatal mucosal subsidence at the time of pain onset in dentate persons has been developed. However, palatal mucosal stress analysis in a simulation based on three-dimensional finite element analysis is effective for objective and efficient evaluation of various types of denture-supporting mucosa. Recently plate dentures are not easily modified after the completion of these dentures , so it is essential to effectively assess the sites and magnitude of relief at the time of preparation. However, there is considerable variation in the magnitude of optimal relief and relief range, and there are no guidelines that present these clearly, leading the surgeon to decide subjectively. Thus, this study aimed to develop an optimal relief method to improve the stress bearing capacity of the palatal mucosa.Objectives: The objective of this study, the borderline was set in steps. The changes in stress distribution in the palatal mucosa due to the selective relief of stresses above the borderline were evaluated using a three-dimensional finite element simulation. The purpose of this study was to develop an optimal relief method to improve the bearing capacity of the palatal mucosa.Methods: The objective of this study, the borderline, was set in steps. A three-dimensional finite element model for the pseudopalatal plate was prepared and used to evaluate the changes in stress distribution in the palatal mucosa due to the selective relief of stresses above the borderline. The resulting data were used to develop the optimal relief method.Results: In the relief model with a borderline of 0.04 MPa or higher, the distribution volume at which high stress of 0.20 MPa or higher is generated was approximately about 800%％ of that with the no-relief model, and in the relief model with a borderline of 0.06 MPa or higher, the respective ratio was approximately about 280％%. On the other hand, the relief models with borderline of 0.14 MPa or higher were about 60%. In the mid-palatal relief model, the distribution volume at which stress of 0.20 MPa or higher was generated was 180% of that in the relief model.Conclusions: The supportive strength of plates can be increased by selectively applying optimal relief rather than standard relief, allowing for easier and more effective plate-denture treatment.

scholarly journals Finite element modeling of bearing elements technological machines and equipment

2018 ◽  
Vol 226 ◽  
pp. 04010
Author(s):  
Sergey I. Yevtushenko ◽  
Sergey A. Alekseev ◽  
Igor A. Petrov ◽  
Vladimir E. Fedorchuk
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Bearing Capacity ◽  
Front Axle ◽  
Structural Elements ◽  
Conveyor Belts ◽  
Technical Production ◽  
Combine Harvester ◽  
And Performance ◽  
Plastic Containers

The paper considers the examples of technical production tests to determine the bearing capacity of the structural elements of technological machines and equipment used in various industries and agriculture: the bearing beam of the front axle of the combine harvester, fixed support plates of the apparatus for the production of plastic containers, bearing profiles of the thermal press designed to connect the ends of conveyor belts of various sizes, etc. The nature of stress distribution and deformations in the elements of the existing variants of technological machines and equipment allowed to identify shortcomings in their design. Analysis of calculations in ANSYS environment allowed to recommend variants of models of technological machines and equipment with better indicators of bearing capacity. This will greatly improve their reliability and performance.

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