Thermoelastic stress analysis of titanium components and simultaneous assessment of residual stress

Galietti, Umberto; Palumbo, Davide

doi:10.1051/epjconf/20100638015

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…A complementary theoretical study should be devoted in the future to investigate new materials [72][73][74][75][76][77][78][79][80][81], and functionalized multi-layered targets with better performances, keeping the thermo-mechanical stability as the beam spot size is reduced and the intensity of the source increased, that is the current challenge in the muon collider.…”

Section: Discussionmentioning

confidence: 99%

Theoretical Modeling for the Thermal Stability of Solid Targets in a Positron-Driven Muon Collider

Cesarini

Antonelli

Anulli³

et al. 2021

Int J Thermophys

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A future multi-TeV muon collider requires new ideas to tackle the problems of muon production, accumulation and acceleration. In the Low EMittance Muon Accelerator concept a 45 GeV positron beam, stored in an accumulation ring with high energy acceptance and low angular divergence, is extracted and driven to a target system in order to produce muon pairs near the kinematic threshold. However, this scheme requires an intensity of the impinging positron beam so high that the energy dissipation and the target maintenance are crucial aspects to be investigated. Both peak temperature rises and thermomechanical shocks are related to the beam spot size at the target for a given material: these aspects are setting a lower bound on the beam spot size itself. The purpose of this paper is to provide a fully theoretical approach to predict the temperature increase, the thermal gradients, and the induced thermomechanical stress on targets, generated by a sequence of 45 GeV positron bunches. A case study is here presented for Beryllium and Graphite targets. We first discuss the Monte Carlo simulations to evaluate the heat deposited on the targets after a single bunch of 3 × 1011 positrons for different beam sizes. Then a theoretical model is developed to simulate the temperature increase of the targets subjected to very fast sequences of positron pulses, over different timescales, from ps regime to hundreds of seconds. Finally a simple approach is provided to estimate the induced thermomechanical stresses in the target, together with simple criteria to be fulfilled (i.e., Christensen safety factor) to prevent the crack formation mechanism.

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Section: Discussionmentioning

confidence: 99%

Theoretical Modeling for the Thermal Stability of Solid Targets in a Positron-Driven Muon Collider

Cesarini

Antonelli

Anulli³

et al. 2021

Int J Thermophys

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“…As previously introduced, a calibration test [ 29 , 30 , 31 , 34 ] was performed to obtain the thermal calibration constants for the employed material. A plane plate subjected to cyclic uniaxial loading allows a uniaxial stress state to be obtained.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…An additional test was previously conducted to measure the thermoelastic constants for the employed material [ 29 , 30 , 31 ]. Thus, a plane plate machined from the same material sheet was tested under tensile cyclic load at different values of amplitude and mean stress values.…”

Section: Experimental Campaignmentioning

confidence: 99%

“…From the measured temperature maps, the phase and amplitude temperature maps were calculated by fitting temperature-time data to Fourier series as reported in reference [18]. An additional test was previously conducted to measure the thermoelastic constants for the employed material [29][30][31]. Thus, a plane plate machined from the same material sheet was tested under tensile cyclic load at different values of amplitude and mean stress values.…”

Section: Experimental Campaignmentioning

confidence: 99%

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Study of Effective Stress Intensity Factor through the CJP Model Using Full-Field Experimental Data

Camacho-Reyes,

Vasco-Olmo,

Gómez Gonzales

et al. 2023

Materials

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In this work, the Christopher–James–Patterson crack tip field model is used to infer and assess the effective stress intensity factor ranges measured from thermoelastic and digital image correlation data. The effective stress intensity factor range obtained via the Christopher–James–Patterson model, which provides an effective rationalization of fatigue crack growth rates, is separated into two components representing the elastic and retardation components to assess shielding phenomena on growing fatigue cracks. For this analysis, fatigue crack growth tests were performed on Compact-Tension specimens manufactured in pure grade 2 titanium for different stress ratio levels, and digital image correlation and thermoelastic measurements were made for different crack lengths. A good agreement (~2% average deviation) was found between the results obtained via thermoelastic stress analysis and digital image correlation indicating the validity of the Christopher–James–Patterson model to investigate phenomena in fracture mechanics where plasticity plays an important role. The results show the importance of considering crack-shielding effects using the Christopher–James–Patterson model beyond considering an exclusive crack closure influence.

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“…Residual stresses have a substantial effect on engineering properties of material and welded structures, particularly fatigue strength, corrosion resistance, dimensional stability, and distortion [9]. Many researchers have practiced various methods to measure residual stresses using experimental and numerical methods [10][11][12]. In recent years, as high computational power is available, many researchers have acknowledged the reliability of using the finite element method for this purpose [13,14].…”

Section: Introductionmentioning

confidence: 99%

Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel

Ahmad

Hwang

Lee

et al. 2017

Metals

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Abstract:The reliability of welded structure can be evaluated through welding residual stress analysis and fatigue strength assessment. In this study, welding residual stresses of multi-pass dissimilar material welded joint between alloy 617 and 12Cr steel were analyzed numerically and experimentally. Fatigue strength was then assessed in the air. Based on results of welding residual stress analysis and fatigue strength assessment, a fatigue design method considering welding residual stress was investigated. Welding residual stresses at the weld of dissimilar welded joints distributed complicatedly on longitudinal and transverse directions, showing differences but a very similar distribution tendency between numerical and experimental results. Numerical and experimental peak values of welding residual stresses at HAZ of the weld on the 12Cr steel side were predicted to be 333 MPa and 282 MPa HAZ, respectively. The fatigue limit of dissimilar material welded joint between alloy 617 and 12Cr steel was assessed to be 306.8 MPa, which was 40% of tensile strength (767 MPa) of dissimilar material welded joint. However, the stress range including welding residual stress was assessed to be 206.9 MPa, which was 14% lower than that calculated by including the effect of residual stresses.

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Thermoelastic stress analysis of titanium components and simultaneous assessment of residual stress

Cited by 6 publications

References 12 publications

Theoretical Modeling for the Thermal Stability of Solid Targets in a Positron-Driven Muon Collider

Theoretical Modeling for the Thermal Stability of Solid Targets in a Positron-Driven Muon Collider

Study of Effective Stress Intensity Factor through the CJP Model Using Full-Field Experimental Data

Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel

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