observation on the creep and cracking of graphite

Presentation: Safety Evaluation Challenges for NGNP VHTR

Safety Evaluation Challenges for NGNP VHTR Materials of Construction and Components Makuteswara Srinivasan, Amy Hull, and Shah Malik Office of Nuclear Regulatory Research The contents of this presentation do not necessarily reflect any position of the NRC.

(PDF) MODELING AND EXPERIMENTAL STUDIES OF

Pyrolytic graphite rod was cut to the desired dimension (14x 14 x 4.5 mm), and (14 x 14 x 9 mm).. Two surfaces of the graphite samples were wet grounded, silicon carbide papers.The samples are polished with 0.3 m alumina suspension, and followed by

High temperature compressive creep of sintered nickel

graphite mold containing 10 to 12 flat-bottomed holes .375 inch in diameter and .75 inch in depth. The mold so charged was then inserted into a nichrome wound, silica tube, presintering furnace which was maintained at 1000C. The atmosphere in the

Zheng Chen

The thermal images of softwood test-pieces containing a knot under torsional loading predicted the cracking time and crack position that agreed well with visual observation. The thermal images obtained under torsional fatigue loading indicated a temperature increase during the unloading part of a loading cycle, which meant that thermal energy was dissipated during the

MEASUREMENT OF HIGH TEMPERATURE IRRADIATION

article{osti_4673349, title = {MEASUREMENT OF HIGH TEMPERATURE IRRADIATION CREEP IN GRAPHITE. Project DRAGON.}, author = {Blackstone, R}, abstractNote = {As part of the joint Dragon/THTR graphite irradiation programme, experimental techniques have been evolved for measuring the irradiation creep of graphite at high temperatures.

Irradiation induced creep behavior of H

2008/10/31Apparent creep strain for H-451 graphite irradiated at 600 C and 20.7 MPa applied stress as a function of neutron dose. Download : Download full-size image Fig. 4. Apparent creep strain for H-451 graphite irradiated at 900 C and 13.8 MPa applied stress as a .

Effects of temperature, strain rate and grain size on the compressive properties

Effects of temperature, strain rate and grain size on the compressive properties of Ti 3SiC 2 T. Zhen, M.W. Barsoum *, S.R. Kalidindi Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, United States Received 11 February

High temperature compressive creep of sintered nickel

graphite mold containing 10 to 12 flat-bottomed holes .375 inch in diameter and .75 inch in depth. The mold so charged was then inserted into a nichrome wound, silica tube, presintering furnace which was maintained at 1000C. The atmosphere in the

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

July 03, 2017 There had been a service stop from Jul 2, 2017, 8:06 to Jul 2, 2017, 19:12(JST) (Jul 1, 2017, 23:06 to Jul 2, 2017, 10:12(UTC)) . The service has been back to normal.We apologize for any inconvenience this may cause you. May 18, 2016 We have

Transactions of the Japan Society of Mechanical Engineers

From the microdamage observation, micro-cracking of oxide film at the crack tip in the strain localized region seems to be a dominant factor of micromechanism of fatigue crack growth. The maximum principal strain, which is the linear summation of the shear strain and the normal strain perpendicular to the crack path, has been identified as an important parameter in multiaxial fatigue at high

Effect of aqueous and carbonic fluids on the dislocation

Graphite was not observed in the Heavitree quartzites deformed by Post et al., which we suspect accounts for their observation that did not affect the strength of quartz. A relationship between and the enhancement of dislocation climb was also documented by Tullis and Yund [1989] who performed annealing experiments on predeformed Heavitree quartzite with or without ∼0.17 wt.% water added at

Creep

Dislocation creep is excluded by the observation of continuous advance of Li BCC by overcoming partial obstructions inside the tubules during deposition. Both dislocation creep and bulk diffusional Nabarro-Herring creep are excluded by the observation of Li BCC stripping across a void region, since both mechanisms necessitate the presence of bulk Li BCC to accommodate bulk diffusion or bulk

Metals

There is a need for improved formulations for creep-fatigue, with coefficients that determinable directly from the existing and simple creep-fatigue tests and creep rupture tests. Outcomes—A unified creep-fatigue equation is proposed, based on an extension of the Coffin-Manson equation, to introduce dependencies on temperature and frequency.

Reversible Loss of Bernal Stacking during the

There is extensive literature upon the observation and analysis of basal plane dislocations and stacking faults in graphite by transmission electron microscopy. The best examples are as a result of radiation damage where extensive arrays of basal plane stacking faults bounded by

Mechanical and Metallurgical Failure Mechanisms

Cracking of dissimilar metal welds occurs in the ferritic (CS or low alloy) side of a weld between an Austenitic (300SS or Ni-Alloy) and a ferritic material operating at high tmeperature. Cracking can result from creep damage, from fatigue cracking from sulfide

Geosciences

We determined the activation volumes (V*) for polycrystalline magnesite with grain sizes of 2 and 80 m deforming by low temperature plasticity (LTP) mechanisms (kinking and dislocation glide), diffusion creep, and dislocation creep at temperatures of 500, 750, and 900 C, respectively, and a strain rate of 1–2 10 −5 s −1 at effective pressures of 2.9–7.5 GPa in a D-DIA and 0.76 GPa

Static fatigue of graphite

Subcritical crack growth has been studied in two different grades of a fine-grained isotropic graphite and in pyrolytic graphite. The double torsion technique was used. Room temperature tests revealed a stress intensity-crack velocity behaviour similar to the third stage of crack growth in soda-lime glass. Thus, it appears that graphite undergoes static fatigue at room temperature only at

Correct procedure for flange bolting Installation Procedure

Correct procedure for flange bolting Installation Procedure The most common cause of leaky gasket joints is improper installation procedures. Care shall be taken at all stages given below. Cutting of Soft Gaskets First cut / punch bolt holes. Cut the bolt holes

Metals

There is a need for improved formulations for creep-fatigue, with coefficients that determinable directly from the existing and simple creep-fatigue tests and creep rupture tests. Outcomes—A unified creep-fatigue equation is proposed, based on an extension of the Coffin-Manson equation, to introduce dependencies on temperature and frequency.

Review: Hydrogen Embrittlement of Metals and Alloys in

ranging from -100 C to 700 C, gas purity is important in this case. The cracking initiates on the surface or inside the material. Several methods have been used to analyze this type of HE, for example, notched and unnotched tensile, creep rupture, fatigue

Damage in composite materials (Chapter 3)

Wood, C. A. Bradley, W. L. Determination of the effect of seawater on the interfacial strength of an interlayer E-glass/graphite/epoxy composite by in-situ observation of transverse cracking in an environmental sem Compos Sci Technol 57 1997 1033

Materials

An observation at magnification indicated that BAQPS tended to agglomerate, which is likely due to the smaller d-spacing compared to BAQAS. On the other hand, increasing the amount of these bentonites to 3 wt.% caused a significant change in the structure and the formation of morphology with a structure characteristic for composites containing modified aluminosilicates ( Figure 14 g–j) [ 67

Method of bonding graphite to metal

The method for bonding graphite to metal, includes the steps of forming a metal carbide layer on a surface of the graphite, the metal being to be bonded to said graphite, and brazing the graphite to the metal with an active alloy brazing material. The present invention

Micromechanistic modelling of the polycrystalline response

2016/1/1The graphite crystal structure has hexagonal symmetry about the "c-axis" which is perpendicular to the "basal planes".In what follows, the mutually perpendicular unit vectors of the coordinate system (e 1,e 2,e 3) are chosen such that e 1 lies along the c-axis and e 2,e 3 lie in the basal plane.lie in the basal plane.

Effect of Compaction Load and Sintering Temperature on

Effect of Compaction Load and Sintering Temperature on Tribological and Mechanical Behavior of Ni/SiC/MoS2 Composites Effect of Compaction Load and Sintering Temperature on Tribological and Mechanical Behavior of Prabhu, T 2016-03-14 00:00:00 JMEPEG (2016) 25:1436–1445 ASM International DOI: 10.1007/s11665-016-1994-7 1059-9495/$19.00 Effect of Compaction Load and

Advanced NDTs for Inspection of Catalyst Tubes of Reformer Furnace

that creep damage is present, based on observation of the signal parameters in comparison to similar changes that occurred on known creep-damaged materials. ⋅ Automated Ultrasonic Testing (AUS): It is well known that the creep damage in materials

Method of bonding graphite to metal

The method for bonding graphite to metal, includes the steps of forming a metal carbide layer on a surface of the graphite, the metal being to be bonded to said graphite, and brazing the graphite to the metal with an active alloy brazing material. The present invention

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