An analysis of stress uniformity in split Hopkinson bar test specimens

Yang, Liming; Shim, V.P.W.

doi:10.1016/j.ijimpeng.2003.09.002

Cited by 140 publications

(74 citation statements)

References 13 publications

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“…The details of the studied e ects of these parameters on the obtained results of SHPB tests are available elsewhere [7]. These assumptions are critically assessed by various researchers worldwide, both numerically and experimentally, and the advantages and disadvantages of SHPB tests are highlighted [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In the past, researchers used Johnson-Cook (JC) [12] model, which is a curve tting technique to predict materials response at higher strain rate, strain and temperature used in FE simulation of machining processes [10,[13][14][15][16][17]. The model has the capability to represent materials' response accurately in machining operations and produce precise results in FE simulation with the achieved experimentations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Behaviour of β-Ti-15333 in Ultrasonically Assisted Turning: Experimental and Numerical Analysis

Muhammad

Ahmed

Ullah³

et al. 2017

Scientia Iranica

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Abstract. The enhanced strength, fatigue life, and corrosion resistance properties of Tialloys have attracted many industries for their utilization in various components exposed to extreme operating conditions. The machining of these alloys using conventional machining techniques is one of the main challenges in its wide application in many components, and there is an obvious demand to analyse the materials' response to these alloys in machining processes by developing simulation-based models. The materials' behaviour used in simulation of machining processes is usually determined by means of Split-HopkinsonPressure-Bar (SHPB) setup. A 3D thermo-mechanically coupled Finite-Element (FE) model of SHPB is developed in the current work to analyse materials response of -Ti-15333 at the selected temperature, strain rate, and strain. The obtained materials' response to the tested alloys is used in 3D thermo-mechanically coupled FE model of ultrasonically assisted turning and conventional turning at various tested cutting conditions. The developed FE model is used for parametric analysis of -Ti-15333 machining, and the obtained FE results are in good agreement with experimental results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Behaviour of β-Ti-15333 in Ultrasonically Assisted Turning: Experimental and Numerical Analysis

Muhammad

Ahmed

Ullah³

et al. 2017

Scientia Iranica

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“…Various studies were carried out on specimen design [21], stress uniformity [22] and stress wave reverberation [23,24]. It was observed that the loading pulse with larger rise time generates better stress uniformity than the loading pulse with lesser rise time [22,23].…”

Section: Introductionmentioning

confidence: 99%

“…It was observed that the loading pulse with larger rise time generates better stress uniformity than the loading pulse with lesser rise time [22,23]. Rise time of the incident pulse can be increased by placing a pulse shaper such as a small strip of soft material at impact end of the incident bar.…”

Section: Introductionmentioning

confidence: 99%

Hybrid composites under high strain rate compressive loading

Naik

Veerraju

Kavala

2008

Materials Science and Engineering: A

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“…When the strain measurements in SHTB experiments are only based on strain gauge readings, without speed camera image analysis, also the length of the specimen may greatly affect the calculation of a Corresponding author: gmirone@dii.unict.it the engineering strain, as also Rusinek et al [5], Osovski et al [6] and Rodriguez-Martinez et al [7] pointed out. For this reason in [6] is proposes a "structural strain" for taking into account the strain localization induced by the necking.…”

Section: Introductionmentioning

confidence: 99%

Experimental issues and interpretation of the necking phenomena in the dynamic characterization via Hopkinson bar

Mirone

Corallo

2015

EPJ Web of Conferences

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Abstract. The usual procedures for processing experimental data from Hopkinson bars (HB) are based on modeling hypotheses which, in some cases, may lead to considerable approximations. The effects of the specimen geometry and of the necking are analysed, both experimentally and by FE analyses, for assessing how much the conventional values of strain rate, strain and stress, based on strain gauges readings along the HB, are affected by approximations in different testing conditions. Also, from the way the necking affects the load/area ratio, useful considerations arise about the hardening response of metal alloys under high strain rates. The sensitivity of stress-strain curves to the time-translations of strain waves along the bars is assessed by comparing the above curves to others where the strain, the strain rate and the current cross section come from speed camera image analyses. This clearly shows that the effective strain rate in the most strained areas of the specimens is many times higher than the nominal value, and also allows to explore how much the engineering curve is poorly representative of the material response, due to strain localization in the post-necking phase. The necking-affected length compared to the total gauge length is also found to significantly influence the strain response of the specimens, in a way that can easily mislead the experimenters in the derivation of the material ductility. An empirical relationship, already found to be valid in the post-necking quasi-static regime for transforming the true stress (load / current area) into an estimation of the cross section-averaged equivalent stress, is also found to apply at high strain rates if only the appropriate considerations are done on the way the equivalent stress is considered.

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An analysis of stress uniformity in split Hopkinson bar test specimens

Cited by 140 publications

References 13 publications

Dynamic Behaviour of β-Ti-15333 in Ultrasonically Assisted Turning: Experimental and Numerical Analysis

Dynamic Behaviour of β-Ti-15333 in Ultrasonically Assisted Turning: Experimental and Numerical Analysis

Hybrid composites under high strain rate compressive loading

Experimental issues and interpretation of the necking phenomena in the dynamic characterization via Hopkinson bar

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