The new diffractometer ARES for the analysis of residual stresses

Staron, Peter; Ruhnau, H.-U; Marmotti, M.; Mikula, P.; Kampmann, R.

doi:10.1016/s0921-4526(99)01295-8

Cited by 25 publications

(14 citation statements)

References 2 publications

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“…8 The underlying crystallographic metal lattice planes become stretched under the influence of residual stress (acting as internal strain gauges) and these diffraction techniques measure local variations in the lattice plane spacing across the weld for different orientations. These can then be used to calculate the residual stresses in that region using elasticity theory.…”

Section: Residual Stress Determination By Diffractionmentioning

confidence: 99%

Distortion control in welding by mechanical tensioning

Price¹,

Williams²,

Wescott³

et al. 2007

Science and Technology of Welding and Joining

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This paper investigates the potential of mechanical tensioning (MT) to reduce the magnitude of residual stresses in welds and to eliminate buckling distortion. Both friction stir (FSW) and arc welds have been produced from the aluminium alloy AA2024, with different levels of tensile stress applied along the weld line either during or after welding. The resulting welds have been characterised in terms of out of plane distortion, residual stresses and microstructure. Buckling distortion was eliminated by stretching plates to between 35 and 70% of the yield stress of the material during welding. For each set of welding parameters investigated, an optimum tensioning stress has been identified, which eliminates the tensile residual stress peak across the weld zone, along with distortion. This optimum tensioning stress increases in line with the heat input of the welding process. When MT stresses are increased beyond this optimum value, then distortion arises once more and a band of compressive stress is formed across the weld zone.

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Section: Residual Stress Determination By Diffractionmentioning

confidence: 99%

Distortion control in welding by mechanical tensioning

Price¹,

Williams²,

Wescott³

et al. 2007

Science and Technology of Welding and Joining

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“…[18] For the measurement of IN 718, which is dominated by the face-centred cubic (fcc) Ni-matrix, the (311) reflection was used, because it is generally recommended in literature for the evaluation of macrostrains in fcc lattices. [19,20]] The influence of intergranular stresses on (311) lattice planes is small and thus it should be best to reflect macrostresses.…”

Section: Neutron Diffractionmentioning

confidence: 99%

“…[18] Neutrons of 0.164 nm wavelength from an elastically bent perfect Silicon (311) monochromator were used. The Al(311) diffraction peak was recorded with an area detector at an angle of about 84°.…”

Section: Neutron Diffractionmentioning

confidence: 99%

Diffraction‐Based Residual Stress Analysis Applied to Problems in the Aircraft Industry

Staron¹,

Cihak

Clemens

et al. 2007

Adv Eng Mater

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Cost reduction and weight saving are most important principles governing design and construction of aircrafts. Advanced alloys and thermo‐mechanical treatments as well as new and optimized production processes are being developed. For example, welding of fuselage components like stringers or clips made of Al alloys can have several advantages over riveting. Retention of optimum weld microstructure and properties as well as control of welding related residual stresses and distortion is essential. In the context of risk analysis and damage tolerance it will be of growing importance to study residual stress fields in weld configurations and their influence on fatigue crack propagation. In this paper, methods to evaluate residual stresses in turbine discs and laser welded Al joints are reviewed.

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“…by turning, is governed by bulk residual stresses, neutron diffraction is the only available technique to measure strains within a part having a thickness of several cm. The measurements, using the whole disc, were conducted at the diffractometer ARES at GKSS, Germany [6]. A constant wavelength of 0.164 nm was used to monitor the distance of the (311) lattice planes as a function of the position within the disc [7].…”

Section: Neutron Diffractionmentioning

confidence: 99%

Characterization of Residual Stresses in Compressor Discs for Aeroengines: Neutron Diffraction and Finite Element Simulations

Cihak¹,

Stockinger²,

Staron³

et al. 2005

Superalloys 718, 625, 706 and Various Derivatives (2005)

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Knowledge of the evolution of residual stresses developing during fabrication of industrial components is steadily gaining importance. Therefore, the prevailing residual stresses in a number of identical hot-forged water quenched compressor discs made of nickel-base alloy IN718 have been studied by neutron diffraction. Simultaneously, independent finite element simulations (FEM) have been performed characterizing different quenching rates. Furthermore, temperature measurements have been performed during water quenching and the simulated temperatures are compared to the measured ones. The results of the finite element simulations agrees well with those obtained from neutron diffraction and temperature measurements.

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The new diffractometer ARES for the analysis of residual stresses

Cited by 25 publications

References 2 publications

Distortion control in welding by mechanical tensioning

Distortion control in welding by mechanical tensioning

Diffraction‐Based Residual Stress Analysis Applied to Problems in the Aircraft Industry

Characterization of Residual Stresses in Compressor Discs for Aeroengines: Neutron Diffraction and Finite Element Simulations

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