Residual stress prediction based on MTS model during machining of Ti-6Al-4V

Pan, Zhipeng; Liang, Steven Y.; Garmestani, Hamid; Shih, Donald S.; Hoar, Eric

doi:10.1177/0954406218805122

Cited by 10 publications

(2 citation statements)

References 20 publications

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“…The dynamic properties measured by the aforementioned instruments are typically used for the calibration of strain-rate-dependent constitutive models, 23–27 which are indispensable for the modelling and simulation of high-strain rate events. 28–37…”

Section: Introductionmentioning

confidence: 99%

One-dimensional analyses of striker impact on bar with different general impedance

Shin

Kim

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The particle velocity and stress in the striker and bar generated by the striker impact on a bar with different general impedance are formulated based on one-dimensional assumptions. Departure of the impact-generated stress wave towards the rear end of the striker and arrival of the release wave from the rear to the front of the striker constitute one impact cycle. In cases where Zs ≤ Zb ( Z is the general impedance, and subscripts ‘s’ and ‘b’ denote striker and bar, respectively), only one impact cycle takes place because the striker is stationary or separated from the impact surface after the first impact cycle. As a result, only a single (primary) pulse is observed in the bar and striker. In the case where Zs > Zb, however, multiple impact cycles take place because the striker is compressing the bar continually after the first cycle. As a result, a series of step-wise residual pulses follow the primary pulse in the bar and striker. The magnitudes of the stress and particle velocity in the bar and striker calculated using the formulated equations are quantitatively consistent with the results of the numerical simulations, verifying the formulated one-dimensional equations. The equations formulated in this study may be useful for better understanding the various wave interaction phenomena that take place in a pseudo-one-dimensional impact system and for modifying/designing an impact system.

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Section: Introductionmentioning

confidence: 99%

One-dimensional analyses of striker impact on bar with different general impedance

Shin

Kim

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Split Hopkinson bars (SHBs) 1–9 are being used extensively to measure the uniaxial stress–strain and strain rate–strain curves of various solids 10–16 at high strain rates. These measured curves are generally used to calibrate a strain rate-dependent constitutive model, 17–24 which is indispensable for computer simulations of the deformation behaviour of solids and structures at high strain rates. 25–32 The stress–strain and strain rate–strain curves of specimens subjected to SHB testing are usually obtained via one-wave analysis according to the one-dimensional (1D) theory of SHB 2–9 (equations (1) to (3)) Here, s , e· , and e are the nominal stress, nominal strain rate, and nominal strain of the specimen, respectively; A and L are the initial cross-sectional area and initial length of the specimen, respectively; ɛT and ɛR are the measured strain of the transmi...…”

Section: Introductionmentioning

confidence: 99%

Design guidelines for the striker and transfer flange of a split Hopkinson tension bar and the origin of spurious waves

Shin

Lee

Kim

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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Characteristics of the stress pulse generated by impact of a hollow striker on the flange of a split Hopkinson tension bar are investigated via an explicit finite element analysis. Design guidelines are extracted for the hollow striker and flange from the viewpoint of eliminating spurious waves located between the incident and reflected pulses. According to design guidelines, it is desirable to have a striker cross-sectional area the same as that of the flange. It is also desirable to make the cross-sectional area of the striker (flange) the same as that of the bar. As for the flange length, it is recommended to be comparable to the diameter of the bar. The magnitude and duration of the primary stress pulse are consistent with the results of a one-dimensional analysis even when spurious waves are present; meanwhile, overly long spurious waves should be avoided to eliminate their superposition with the reflected pulse. Spurious waves appear when general impedance of the striker is higher than the bar. The origin of spurious waves is a series of step-wise residual pulses generated by multiple cycles of striker impact that make the striker keep compressing the flange after the first cycle of impact. Step-wise residual pulses appear in two forms (continuous waves and discrete waves) in spurious waves due to the secondary impacts during the entrance process of step-wise residual pulses to the flange. The consequences of spurious waves in the use of split Hopkinson tension bars are discussed.

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Microstructure affected residual stress prediction based on mechanical threshold stress in direct metal deposition of Ti-6Al-4 V

Mirkoohi

Mahdavi

Li³

et al. 2021

Int J Adv Manuf Technol

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Residual stress prediction based on MTS model during machining of Ti-6Al-4V

Cited by 10 publications

References 20 publications

One-dimensional analyses of striker impact on bar with different general impedance

One-dimensional analyses of striker impact on bar with different general impedance

Design guidelines for the striker and transfer flange of a split Hopkinson tension bar and the origin of spurious waves

Microstructure affected residual stress prediction based on mechanical threshold stress in direct metal deposition of Ti-6Al-4 V

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