fracture assessment of graphite components weakened

Assessment of Static Delamination Propagation Capabilities in

fracture toughness, GIB [7] and GIIB [9], respectively. The SLB specimen is used to evaluate the mixed-mode I/II interlaminar fracture toughness [30, 32]. The DCB-1 and ENF specimens consisted of T300/1076 graphite/epoxy with a unidirectional layup and the

Fracture and failure assessment of complex materials

Fracture and failure assessment of complex materials This research theme focuses on identifying fundamental mechanisms of fracture in complex multiphase materials. The aim is to understand damage evolution as well as failure initiation and provide relation to microstructure, performance and reliability of modern materials and components made from them.

Tensile, Compression and Fracture Properties of Thick

The article presents the outcome of a comprehensive program of tensile, compression and fracture toughness experiments, addressing thick-walled ductile cast iron inserts used for the production of three nuclear waste canisters. The resulting data are required as input to the assessment of the failure probability of the canisters. Moreover, these data are useful for the improvement of the

Fracture toughness of nuclear graphite nbg

Objective: Graphite components in a Very High Temperature Reactor (VHTR) may fracture under the actions of external and internal (irradiation-induced) stresses. Measurement of the fracture properties of graphite is therefore essential in the design and structural integrity assessment of VHTR cores.

Control volumes and strain energy density under small and

Filippo Berto, A criterion based on the local strain energy density for the fracture assessment of cracked and V-notched components made of incompressible hyperelastic materials, Theoretical and Applied Fracture Mechanics, 10.1016/j.tafmec.2014.12.008, 76,

Management of Ageing in Graphite Reactor Cores

Management of Ageing Processes in Graphite Reactor Cores discusses in detail both the scientific challenges and the issues involved in this subject. It begins with an introductory section on the fundamentals of reactor design and goes on to discuss graphite core behaviour under irradiation; graphite-component behaviour and its assessment; and whole core behaviour.

Brittle Failure of Graphite Weakened by V

Dealing with failure assessment for brittle fracture in V-shaped and U-shaped notched components, a criterion based on the strain energy density (SED) over a control volume has been developed [44, 45] and applied successfully in the last years.

Finished

Researcher: Craig Morrison Supervisors: Prof Andrey P Jivkov (MACE), Dr Christopher Race (Materials) The integrity of graphite components is critical for their fitness for purpose. Since graphite is a quasi-brittle material the dominant mechanism for loss of integrity is cracking, most specifically the interaction and coalescence of micro-cracks into a critically sized flaw.

Fracture assessment of graphite components weakened by

2016/1/1Fracture assessment of graphite components weakened by rounded V-notches and subjected to static multiaxial loading Author links open overlay panel Filippo Berto a b Alberto Campagnolo c Majid Ayatollahi d Afrooz Barnoush b

Effect of Tensile Strength on the Microstructure of Graphite

of graphite materials,5 such as the bearing between graphite components, the asymmetry of component structures, in situ studies on the tensile fracture of graphite impregnated with molten salt. Herein, in situ tensile synchrotron-based two-dimensional X

Fracture assessment of U

2020/1/1Here we evaluate the applicability of the Cohesive Zone Model (CZM) for the assessment of the fracture strength of experimentally tested U-notched specimens subject to mode I loading. The fracture loads of U-notched components with different notch tip radii can be predicted with an average discrepancy of 7%.

Civil and Structural Engineering Department Module Description : CIV410

6. Performing the static assessment of components and structures weakened by cracks and defects. 7. Performing the fatigue assessment of components and structures weakened by cracks and defects. 8. Using commercial Finite Element software packages

Reliability Assessment of Graphite Specimens Under Multiaxial

graphite components is shown in figure 3 for an earlier generation II reactor design. Of particular concern is the potential for crack formation and even rupture in individual blocks. Therefore, failure theories and/or effective design strategies that predict and can

Fracture Toughness of Nuclear Graphite NBG

Objective: Graphite components in a Very High Temperature Reactor (VHTR) may fracture under the actions of external and internal (irradiation-induced) stresses. Measurement of the fracture properties of graphite is therefore essential in the design and structural integrity assessment of VHTR cores.

THE USA'S ADVANCED REACTOR TECHNOLOGIES (ART)

In both HTR designs (prismatic and pebble bed) the large graphite components act as neutron moderator and reflector as well as providing mechanical support to the active core. During reactor operation the graphite components of the core are subjected to complex stress states arising from structural loads, thermal gradients, more neutron irradiation damage, and seismic events.

Securing the Safe Performance of Graphite Reactor Cores

The objective of this book is to outline the current approaches in terms of assessment methodologies, surveillance and test methods, performance prediction, graphite reactor decommissioning, regulatory requirements and the relevance to future reactor designs.

Assessment of Static Delamination Propagation Capabilities in

fracture toughness, GIB [7] and GIIB [9], respectively. The SLB specimen is used to evaluate the mixed-mode I/II interlaminar fracture toughness [30, 32]. The DCB-1 and ENF specimens consisted of T300/1076 graphite/epoxy with a unidirectional layup and the

The Basis for a Fracture Mechanics Assessment of Nuclear Graphite

Finally, a recommended methodology for performing a combined fracture mechanics and NDE assessment was outlined. The application of this methodology to graphite core components would reduce the likelihood of components contain "critical" defects G. R

The shear fracture toughness, KIIc, of graphite (Journal

article{osti_1244183, title = {The shear fracture toughness, KIIc, of graphite}, author = {Burchell, Timothy D. and Erdman, III, Donald L.}, abstractNote = {In this study, the critical shear stress intensity factor, KIIc, here-in referred to as the shear fracture toughness, KIIc (MPa m), of two grades of graphite are reported. . The range of specimen volumes was selected to elucidate any

The Compatibility of Nuclear Graphite With Molten Salt in

Due to the porous nature of nuclear graphite, the molten salt may infiltrate the nuclear graphite, which may affect the mechanical strength and irradiation behavior of the nuclear graphite. In order to evaluate the infiltration behavior of molten salt in nuclear graphite, both FLiNaK and FLiBe salts were used to infiltrate two typical nuclear graphite grades: IG110 and NBG18.

THE USA'S ADVANCED REACTOR TECHNOLOGIES (ART)

In both HTR designs (prismatic and pebble bed) the large graphite components act as neutron moderator and reflector as well as providing mechanical support to the active core. During reactor operation the graphite components of the core are subjected to complex stress states arising from structural loads, thermal gradients, more neutron irradiation damage, and seismic events.

Material Properties and Experimental Observations with special focus on Fracture

Assessment of fracture initiation point in inclined notch on Brazilian disk under pressure M.H. Meliani, Z. Azari, G. Pluvinage, Y.G. Matvienko LPTPM, FS, Hassiba Benbouali University of Chlef, Algeria; Laboratoire de Fiabilit

Characterization of Strength and Fracture Toughness of Nuclear Graphite

Characterization of Strength and Fracture Toughness of Nuclear Graphite Using Subsize Specimen Ji Hyun Yoona∗, Thak Sang Byun b, Joe. P. Strizakb, Lance.L. Snead aKorea Atomic Energy Research Institute, 150-1 Deogjin-Dong, Yuseong, Daejeon,305-353, Korea

03/17/2009 Presentation: Some of the Challenges in NGNP HTGR Graphite Component Safety Evaluation

8 Material Degradation Model Evaluation of the Risk-Informed PRA for Graphite Components MTR Data Specific to Each Degradation Graphite Aging Effects – CTE, Creep, Thermal Conductivity, Dimensions, Elastic Modulus, and Strength. F(time (t), time at

CiteSeerX — THE EFFECT OF SPHERICAL FLAWS ON THE

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Graphite is used as a nuclear moderator and a structural material in the core of gas-cooled reactors. The design and strength assessment of graphite core components is generally based

A Probabilistic Based Failure Model for Components Fabricated from Graphite

The life prediction of graphite components in the researching Generation IV nuclear power plants under complex loads has been studied in the past decade. The stress tests of graphite H-451 samples show different strength in tension and in compression and slight anisotropic material property.

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