scholarly journals Correction to: Tamped Richtmyer–Meshkov Instability Experiments to Probe High-Pressure Material Strength

2021 ◽  
Author(s):  
T. J. Vogler ◽  
M. C. Hudspeth
Keyword(s):  
High Pressure ◽  
Material Strength

A correction to this paper has been published: https://doi.org/10.1007/s40870-021-00302-x

Japanese Code for Assessment Procedure for Crack-like Flaws in Pressure Equipment

2002 ◽  
Author(s):  
Shinji Konosu ◽  
Takayasu Tahara ◽  
Hideo Kobayashi
Keyword(s):  
High Pressure ◽  
Fracture Mechanics ◽  
Nuclear Power ◽  
Plate Thickness ◽  
Pressure Vessels ◽  
Material Strength ◽  
Assessment Procedure ◽  
Absorbed Energy ◽  
Industrial Facilities ◽  
Characterization Procedure

There are numerous instances in which in-service flaws due to various kinds of damage and deterioration are found in equipment as a result of in-service inspections. The proper evaluation of such flaws is extremely important. Fitness-for-Service (FFS) codes, such as ASME B&PV Code Sec. XI and JSME S NA1 for nuclear power generation facilities and BS 7910 and API-RP579 for general industrial facilities, are available. In light of such circumstances, the High Pressure Institute of Japan (HPI) has prescribed its code “Assessment procedure for crack-like flaws in pressure equipment” for conducting quantitative safety evaluations of flaws detected in common industrial pressure components such as pressure vessels, piping, storage tanks, and so on designed and fabricated in accordance with Japanese codes and regulations such as JIS B8265 and High Pressure Gas Safety Law. The FFS code consists of Level 1 assessment (whereby assessment can be conducted without extensive knowledge of fracture mechanics) and Level 2 assessment (which enables more detailed fracture mechanics analyses and is currently being studied). The allowable flaw size is specified in accordance with the plate thickness. The required impact absorbed energies based on material strength, whether or not PWHT has been done and the orientation of the flaw in relation to the weld seam, are also specified. An approximated equation of stress intensity factor for an embedded flaw near the surface has been derived. The re-characterization procedure for assessing an embedded flaw has been clarified. The flaw can be judged to be acceptable if its size is less than that of an allowable flaw and the equipment is to be used at temperatures exceeding the temperature (MAT) at which the material absorbed energy meets the required impact absorbed energy.

scholarly journals Material Strength at High Pressure LDRD Strategic Initiative Final Report

2004 ◽  
Author(s):  
D Lassila ◽  
B Bonner ◽  
V Bulatov ◽  
J Cazamias ◽  
E Chandler ◽  
...  
Keyword(s):  
High Pressure ◽  
Material Strength ◽  
Final Report ◽  
Strategic Initiative

A Study on the Wall Thickness and Life Time or Life Cycle of High-Pressure Cylinders for Automotive Vehicles Under Pressure Circulation Conditions

2016 ◽  
Author(s):  
Yi-wen Yuan ◽  
Ming-hai Fu ◽  
Yu Li ◽  
Bo Yang
Keyword(s):  
High Pressure ◽  
Life Cycle ◽  
Wall Thickness ◽  
Life Time ◽  
Material Strength ◽  
Cylinder Wall ◽  
Market Demand ◽  
Pressure Cycle ◽  
Test Verification ◽  
Natural Gas Vehicle

NGV’s (Natural Gas Vehicle) are known for their energy-saving and environment-friendly advantages. The high-pressure cylinder for automotive vehicles (hereinafter cylinder) is the main energy supply unit of an NGV. Therefore, the Life time or Life Cycle of the cylinder is closely related to vehicle safety performance. Pressure cycle test is, as a test that simulates the cylinder filling process, the most realistic and effective method to evaluate cylinder Life time or Life Cycle. To simulate the actual situation of cylinder use, there are two types of Pressure cycle tests: Pressure cycle test under filling conditions and Pressure cycle test under overload conditions (LBB Mode). To meet the market demand for reduced vehicle mass, most cylinder manufacturers in China tend to reduce cylinder weight by improving cylinder material. strength and reducing cylinder wall thickness. Few manufacturers, however, pay attention to the relation between cylinder Life time or Life Cycle and cylinder thickness reduced by strength improvement. In this paper, Pressure cycle tests are conducted on cylinders with the same specification but various wall thickness values to calculate and analyze the Life time or Life Cycle values. This paper is trying to discover the inherent law between cylinder material. strength, wall thickness and Life time or Life Cycle, to put forward the viewpoint that analysis design or test verification can be adopted in cylinder wall thickness design, to build the wall thickness design model for a widely-used cylinder model, and to lay the theoretical basis for lightweight cylinder design under safe conditions.

Experimental results of tantalum material strength at high pressure and high strain rate

2012 ◽  
Author(s):  
Hye-Sook Park ◽  
Nathan Barton ◽  
Jonathan L Belof ◽  
K. J. M. Blobaum ◽  
R. M. Cavallo ◽  
...  
Keyword(s):  
High Pressure ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Experimental Results ◽  
Material Strength

Measurement of material strength at high pressure

2013 ◽  
Vol 25 (12) ◽  
pp. 3168-3172
Author(s):  
袁永腾 Yuan Yongteng ◽  
缪文勇 Miao Wenyong ◽  
涂绍勇 Tu Shaoyong ◽  
詹夏宇 Zhan Xiayu ◽  
郝轶聃 Hao Yidan ◽  
...  
Keyword(s):  
High Pressure ◽  
Material Strength

Novel encapsulation materials for High Pressure-High Temperature (HPHT) applications

2013 ◽  
Vol 2013 (HITEN) ◽  
pp. 000268-000274
Author(s):  
Eric Jian Rong Phua ◽  
Ming Liu ◽  
Riko I Made ◽  
Liying Zhang ◽  
Chee Cheong Wong ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Good Alternative ◽  
Material Strength ◽  
Pressure Loading ◽  
Polymer Resin ◽  
High Pressure High Temperature ◽  
Cross Links

A modified thermoset polymer resin (PR) is evaluated as a form of alternative packaging material to traditional epoxy. It is understood that the thermoset cross-links to a higher degree at high temperature. Hence, its mechanical properties can be improved by changing treatment duration and temperature, rendering the material mechanically stronger for application temperatures beyond 300°C. Material strength was evaluated through a modified compressive testing setup which shows neat PR is comparable to epoxy. Concurrently, adhesion to silicon die and ceramic substrate were evaluated by means of bond shear using the DAGE-4000 shear tester both at room temperature and elevated temperature. Bond shear strength of PR is observed to be higher at room temperature as compared to elevated temperatures when bonded to Silicon (Si) and Alumina (Al2O3), a phenomenon which can be attributed to mismatches in coefficient of thermal expansions (CTE). For high pressure only applications, PR is a good alternative. Pre- and post-pressure loading analysis was carried out by forming an encapsulation analogous to that of a glob top on DIP packages. Observation shows no crack formation, indicating that the material is suitable for high pressure loading up to 207 MPa. For high pressure and high temperature applications (HPHT), pure PR is good up to 250°C at 25 kPsi (172 MPa).

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

Cryosectioning plant roots prepared by high-pressure freezing

1987 ◽  
Vol 45 ◽  
pp. 662-663
Author(s):  
R.E. Crang ◽  
M. Mueller ◽  
K. Zierold
Keyword(s):  
High Pressure ◽  
Cell Walls ◽  
Plant Tissues ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Vitreous State ◽  
Radial Depth ◽  
Irregular Topography ◽  
Considerable Depth ◽  
Conventional Freezing

Obtaining frozen-hydrated sections of plant tissues for electron microscopy and microanalysis has been considered difficult, if not impossible, due primarily to the considerable depth of effective freezing in the tissues which would be required. The greatest depth of vitreous freezing is generally considered to be only 15-20 μm in animal specimens. Plant cells are often much larger in diameter and, if several cells are required to be intact, ice crystal damage can be expected to be so severe as to prevent successful cryoultramicrotomy. The very nature of cell walls, intercellular air spaces, irregular topography, and large vacuoles often make it impractical to use immersion, metal-mirror, or jet freezing techniques for botanical material.However, it has been proposed that high-pressure freezing (HPF) may offer an alternative to the more conventional freezing techniques, inasmuch as non-cryoprotected specimens may be frozen in a vitreous, or near-vitreous state, to a radial depth of at least 0.5 mm.

Sign in / Sign up

Export Citation Format

Share Document