Study of Pressure Sensitive Plastic Flow Behaviour of Gasket Materials

Fontanari, V.; Bellin, Federico; Visintainer, Michael Renê Mix; Ischia, Gloria

doi:10.1007/s11340-006-7105-1

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…The results of Fontanari et al [3] indicate that the yield behavior of pyrophyllite follows the Mohr-Coulomb (MC) ideally elastic-plastic model [5]: Here τ is the shearing stress. σ , C and φ represent the normal stress, the cohesive strength, and the angle of internal friction, respectively.…”

Section: Drucker-prager Plastic Modelmentioning

confidence: 99%

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Simulation of pressure distribution in a pyrophyllite high-pressure cell by finite-element analysis

Han

et al. 2007

High Pressure Research

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The pressure-transmitting behavior and pressure distribution of a pyrophyllite cell in a cubic-anvil large volume high-pressure apparatus is investigated by finite-element analysis (FEA). The mechanical equations describing pyrophyllite under high pressure are given, which are composed of the Drucker-Prager criterion and a linear equation of state. The related material parameters such as cohesive strength, angle of internal friction etc. are experimentally measured. The FEA simulation includes the non-uniformity deviatoric stress caused by plastic deformation and the isotropy hydrostatic pressure of the pyrophyllite cell caused by volume compression. The results demonstrate that, in such a pyrophyllite cell, almost 90% of the pressure is isotropy hydrostatic pressure, and the pressure gradient mainly arise from non-uniform deviatoric stresses. Simulated data are displayed using the contour and the path plots.

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Section: Drucker-prager Plastic Modelmentioning

confidence: 99%

“…Fontanari and Pawley [3,4] have studied the plastic mechanics model and the high-pressure equation of state (EOS) of pyrophyllite. In this work, we first investigate the internal pressure distribution in the pyrophyllite cell with numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

Simulation of pressure distribution in a pyrophyllite high-pressure cell by finite-element analysis

Han

et al. 2007

High Pressure Research

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“…The belt-type apparatus, invented by Hall in 1953, is extensively used for industrial synthesis of diamonds at above 5.5 GPa and 1500–1800℃. 1–4 It is mainly composed of a belt-type die (BTD) and a pair of opposed anvils. The BTD is the core part of the belt-type apparatus.…”

Section: Introductionmentioning

confidence: 99%

Investigation on stress distribution and pressure capacity of two-layer split high-pressure die based on finite element analysis

Zhuo

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to obtain a higher pressure capacity for the high-pressure die with a larger sample cavity, two types of two-layer split dies with a round cylinder and a quadrate cylinder were designed based on the conventional belt-type die. Finite element analysis was performed to investigate the stress distributions and pressure capacities of the high-pressure dies using a derived Mohr–Coulomb criterion and the von Mises criterion for the cylinder and supporting rings, respectively. As predicted by the finite element analysis results, in the two-layer split dies with a round cylinder, the stress state of the cylinder can be only slightly improved; and the von Mises stress of the first layer supporting ring can be hardly decreased. However, in the two-layer split dies with a quadrate cylinder and sample cavity, the stress state of the cylinder can be remarkably improved. Simultaneously, the von Mises stress of the supporting rings, especially for the first-layer supporting ring, can be also effectively decreased. The pressure capacities of the two-layer split dies with a round cylinder and a quadrate cylinder are 16.5% and 63.9% higher with respect to the conventional belt-type die.

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“…They are compressed by the two opposed anvils driven by hydraulic actuators. This leads to a redistribution of pressure in the sample cavity so that the high hydrostatic pressure for synthesizing superhard material is achieved [7,8].…”

Section: Introductionmentioning

confidence: 99%

Strength Analysis of a Novel High-Pressure Die with Double-Layered Split Structure

Zhuo

et al. 2018

Metals

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A novel double-layered split die (DLSD) was designed to have higher pressure-bearing capacity and larger sample cavity volume. In DLSD, the cylinder and first layer supporting ring are split into several blocks. It has a prismatic cylinder and a quasi-prismatic sample cavity. The stress distribution of DLSD was investigated and compared with that of the conventional belt-type die (BTD) and a single-layered split die (SLSD) by the finite element method. The results show that the SLSD can only decrease the stress of the cylinder as there remains significant stress on the first layer supporting ring. However, the novel DLSD can, remarkably, decrease the stress placed on the cylinder and first layer supporting ring simultaneously due to the improvement of the stress states. Additionally, the maximum stress and pressure-bearing capacity of DLSD with different numbers of split blocks were further investigated. It is concluded that the maximum stress of the cylinder increases gradually with an increase in the number of split blocks. Meanwhile, the pressure-bearing capacity decreases accordingly. The experiments show that the pressure-bearing capacities of DLSD with 4 and 8 split blocks are all remarkably higher than that of the BTD. DLSD with 4 split blocks has relatively higher pressure-bearing capacity. This work presents a promising high-pressure die with a double-layered split structure for the synthesis of superhard materials.

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Study of Pressure Sensitive Plastic Flow Behaviour of Gasket Materials

Cited by 12 publications

References 17 publications

Simulation of pressure distribution in a pyrophyllite high-pressure cell by finite-element analysis

Simulation of pressure distribution in a pyrophyllite high-pressure cell by finite-element analysis

Investigation on stress distribution and pressure capacity of two-layer split high-pressure die based on finite element analysis

Strength Analysis of a Novel High-Pressure Die with Double-Layered Split Structure

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