Characterisation of residual stresses by neutron diffraction at the research reactor IR-8 of NRC “Kurchatov Institute”

Karpov, I. D.; Em, V. T.; Mazalov, P.B.; Sulyanova, E. A.

doi:10.1088/1742-6596/1109/1/012046

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The non-destructive measurement of residual stress fields is possible. The neutron diffraction uses the probing power of the neutron into steel, combined with the sensitivity of diffraction (Karpov et al , 2018). The measurement evaluates the separation of lattice planes within grains of polycrystalline steel, thus providing an internal strain gauge.…”

Section: Elastic–plastic Deformation During the Pre-setting Process Of Helical Springsmentioning

confidence: 99%

Elastic–plastic deformation and residual stresses in helical springs

Kobelev

2019

MMMS

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Purpose The purpose of this paper is to develop the method for the calculation of residual stress and enduring deformation of helical springs. Design/methodology/approach For helical compression or tension springs, a spring wire is twisted. In the first case, the torsion of the straight bar with the circular cross-section is investigated, and, for derivations, the StVenant’s hypothesis is presumed. Analogously, for the torsion helical springs, the wire is in the state of flexure. In the second case, the bending of the straight bar with the rectangular cross-section is studied and the method is based on Bernoulli’s hypothesis. Findings For both cases (compression/tension of torsion helical spring), the closed-form solutions are based on the hyperbolic and on the Ramberg–Osgood material laws. Research limitations/implications The method is based on the deformational formulation of plasticity theory and common kinematic hypotheses. Practical implications The advantage of the discovered closed-form solutions is their applicability for the calculation of spring length or spring twist angle loss and residual stresses on the wire after the pre-setting process without the necessity of complicated finite-element solutions. Social implications The formulas are intended for practical evaluation of necessary parameters for optimal pre-setting processes of compression and torsion helical springs. Originality/value Because of the discovery of closed-form solutions and analytical formulas for the pre-setting process, the numerical analysis is not necessary. The analytical solution facilitates the proper evaluation of the plastic flow in torsion, compression and bending springs and improves the manufacturing of industrial components.

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Section: Elastic–plastic Deformation During the Pre-setting Process Of Helical Springsmentioning

confidence: 99%

Elastic–plastic deformation and residual stresses in helical springs

Kobelev

2019

MMMS

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“…A typical NRR has one or more channels (neutron beam tube) which come from the reactor core. This channels are used for any application of neutrons such neutron radiography [6]- [8], neutron diffraction [9,10], neutron therapy [11], neutron activation analysis [12] etc. These channels could be different in length, shape and diameter, depending on the specification of the NRR.…”

Section: Introductionmentioning

confidence: 99%

Collimated neutron beam design for TRR thermal column

et al. 2021

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Tehran Research Reactor (TRR) is the main neutron source in Iran which can be used for different applications of neutrons such as neutron radiography and neutron therapy. TRR has a thermal column which can provide high intensity flux of thermal neutrons for users. The aim of this study is to design a neutron collimator for TRR thermal column to produce parallel neutron beam with suitable intensity of thermal neutrons. To achieve this goal, Monte Carlo code of MCNX has been used to evaluate different configurations, geometries and materials of neutron collimator. The results show that the final selected configuration can provide a uniform thermal neutron beam with a flux of 1.21E+13 (cm-2·s-1) which is suitable for many different neutron applications.

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Presetting and Residual Stresses in Springs

Kobelev

2021

Durability of Springs

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Characterisation of residual stresses by neutron diffraction at the research reactor IR-8 of NRC “Kurchatov Institute”

Cited by 4 publications

References 9 publications

Elastic–plastic deformation and residual stresses in helical springs

Elastic–plastic deformation and residual stresses in helical springs

Collimated neutron beam design for TRR thermal column

Presetting and Residual Stresses in Springs

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