Instrumented anvil-on-rod impact experiments for validating constitutive strength model for simulating transient dynamic deformation response of metals

Martin, Morgana; Shen, T.; Thadhani, Naresh N.

doi:10.1016/j.msea.2008.04.062

Cited by 15 publications

(9 citation statements)

References 24 publications

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“…These have the advantages that they are contact free without any mechanical influence on the specimen and that they can measure continuously a Corresponding author: frank.bagusat@emi.fraunhofer.de with high time resolution. At the EMI a free beam VISAR (velocity interferometer system for any reflector [6][7][8][9][10]) system is used [11][12][13][14][15][16], but in principle also fiber based VISAR setups are known to be used [4,[17][18][19] in connection with inverted Taylor test experiments.…”

Section: The Modified Taylor-test (Mtt)mentioning

confidence: 99%

“…A material data recording (based on wave propagation processes) during the deformation is only executable with strain gauges or with interferometric techniques as in case of the MTT. If the deformation itself is a main point of interest in a study, high speed photography might also be used in addition [17,18].…”

Section: Mtts For Modelling Dynamic Materials Propertiesmentioning

confidence: 99%

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The role of the modified taylor impact test in dynamic material research

Bagusat

Rohr

2015

EPJ Web of Conferences

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Abstract. Dynamic material research with strain rates of more than 1000 1/s is experimentally very often done with a SplitHopkinson Bar, Taylor impact tests or planar plate impact test investigations. At the Ernst-Mach-Institut (EMI), a variant of an inverted classical Taylor impact test is used by application of velocity interferometers of the VISAR type ("Modified Taylor Impact Test", MTT). The conduction of the experiments is similar to that of planar plate impact tests. The data reduction and derivation of dynamic material data can also be restricted to an analysis of the VISAR signal. Due to these properties, nearly each highly dynamic material characterization in our institute done by planar plate investigations is usually accompanied by MTT experiments. The extended possibilities and usefulness of a combined usage of these two highly dynamic characterization methods are explained. Recently, further developed MTT experiments with very small specimen sizes are presented. For the first time, Taylor impact and planar impact specimen can be used for which the load directions even in case of thin plate test material are identical and not perpendicular to each other. Consequences for testing construction elements are discussed.

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Section: The Modified Taylor-test (Mtt)mentioning

confidence: 99%

Section: Mtts For Modelling Dynamic Materials Propertiesmentioning

confidence: 99%

The role of the modified taylor impact test in dynamic material research

Bagusat

Rohr

2015

EPJ Web of Conferences

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“…Interesting further examples of the usage of an MTT setup conducted in the last decade are investigations of stainless steel, copper, titanium, vanadium and composites (L/D = 4 : 1) [10][11][12]. For this work, in addition to a VISAR, precise high-speed camera photographs were presented in order to specify the impact-related deformation of the samples.…”

Section: The Modified Taylor-testmentioning

confidence: 99%

“…Also, a symmetric configuration of an MTT for which a projectile rod is fired onto a target rod is known (investigations of annealed copper, L/D = 10 : 1), where high-speed cameras, a VISAR and strain gauges have been used [13]. All Taylor rod samples used for these experiments [10][11][12][13] had diameters in the range between 9 mm and 19 mm.…”

Section: The Modified Taylor-testmentioning

confidence: 99%

Modified Taylor-tests with miniaturized samples

Bagusat

Rohr

2012

EPJ Web of Conferences

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Abstract.A reversed Taylor-test with application of a velocity interferometer is in use at EMI, called modified Taylor-test (MTT). The experiment consists of impacting a fixed sample rod and observing the rear side of the sample by a velocity interferometer of the VISAR type. The setup enables to determine high-dynamic material data of the sample by evaluating the measured free surface velocity time curve. Normally, rods with a dimension of 6 mm diameter and 60 mm length have been investigated. Samples with this diameter are not producible from sheets: Sheet steels typically have a maximum diameter of 3 mm. Furthermore, it would be a general advantage to be able to work with small sample sizes when seldom or expensive materials have to be investigated. Therefore, efforts for reducing the sample size for MTTs have been made. In recent tests, Taylor rods of 1.5 mm diameter and a length of 15 mm have been used. VISAR data could be captured from these samples, which are comparable with data from larger-size MTTs. This finding offers new perspectives for high-dynamic testing of materials which only allow the production of small sample diameters.

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“…As an example, one can consider the Taylor impact test (Wilkins and Guinan, 1973;Taylor, 1948) applied to a metal with a low value of the stacking fault energy, such as copper or some of steel grades. The Taylor impact tests are the classical dynamic experiments, they have been applied to all kinds of materials, including metals (Martin et al, 2008;Eakins and Thadhani, 2006). A lot of papers are dedicated to research of the widespread metals, such as aluminum (Chapman et al, 2005), copper (Eakins and Thadhani, 2006), titanium and steels (Martin et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Structural model of mechanical twinning and its application for modeling of the severe plastic deformation of copper rods in Taylor impact tests

Mayer

2015

International Journal of Plasticity

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Instrumented anvil-on-rod impact experiments for validating constitutive strength model for simulating transient dynamic deformation response of metals

Cited by 15 publications

References 24 publications

The role of the modified taylor impact test in dynamic material research

The role of the modified taylor impact test in dynamic material research

Modified Taylor-tests with miniaturized samples

Structural model of mechanical twinning and its application for modeling of the severe plastic deformation of copper rods in Taylor impact tests

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