Tracking Deformation History in Split Hopkinson Pressure Bar Testing

Richter, Frank M.; Köppe, Enrico; Daum, Werner

doi:10.1016/j.matpr.2016.03.017

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…• Number of nodes: 10,596 • Number of elements: 9678 Theoretical studies show that for the frequencies found in the Hopkinson bar test, the differences between the interior and exterior elements should be negligible; therefore, they should also be in the model [10][11][12][21][22][23][24][25][26][27].…”

Section: Validation Of the Modelmentioning

confidence: 99%

Influence of the fastening between thread–test samples in the stress–strain curves in tensile dynamic tests

Lezcano

López-Fernández

Cesteros-García

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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A Hopkinson tensile bar has been numerically simulated by means of the commercial software ABAQUS, with different gaps between the sample and the incident and the transmitted bars. This simulated a poor adjustment in the preparation of the tests and observed the effect the measurements of the stress of the incident, reflected and transmitted bars might have in the results of the stress-time and strain-time curves, as well as in the stress-strain curve of an aluminum sample. It is verified that the gap may significantly affect the elastic limit to be obtained from the dynamic tests and the expected results of the ultimate stress and deformation, and also affect the sample stress-strain curve to a large extent. We also concluded in the importance that is necessary in the testing equipment for a dynamic characterization of materials, in this case, the equipment for dynamic tensile testing.

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Section: Validation Of the Modelmentioning

confidence: 99%

Influence of the fastening between thread–test samples in the stress–strain curves in tensile dynamic tests

Lezcano

López-Fernández

Cesteros-García

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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“…SHPB and Direct impact tests have been used in tandem for several classes of materials 35 , 36 . Richter et al 37 deployed Digital Image Correlation (DIC), a non-contact technique, to track the strains during the SHPB’s high-speed strain testing. Yang et al 38 explored the behaviour of aramid fibre-reinforced polymer (AFRP) confined concrete subjected to high strain-rate compression at strain rates ranging from 80 to 170 s .…”

Section: Introductionmentioning

confidence: 99%

Fiber metal laminates for high strain rate applications with layerwise shock impedance tuning

Pai,

Rodriguez-Millan,

Kini

et al. 2023

Sci Rep

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Novel materials such as fiber-metal laminates (FMLs) have demonstrated significant potential in a variety of applications. They must contend with problems such fatigue, creep, high-speed projectile impact, and deformation at high strain rates while in use. When employed as structural materials in aircraft, especially when exposed to shock wave impact and high velocity impact, fiber-metal laminates’ high strain rate characteristics become crucial. Shock impedance matching is a revolutionary approach used for shock-tuning the separate layers. The novelty of the current work is in developing custom shielding laminates, with in-depth analysis on the response of the shock impedance tuning of individual layers on the laminate behaviour at high strain rates. In the current study, five stackups of FMLs comprising metallic (AA 6061-T6) and fiber-reinforced polymer (FRP) plies, were formulated, incorporating shock impedance matching. The fiber-polymer plies used in the FMLs include ultra-high molecular weight polyethylene (UHMWPE), p-aramid for supplementing the impact resistance. Transmission loss functions (TL) estimated from the impedance tube experiments were used to indicate the shock tuning of the various laminates. The laminates underwent testing using a Split Hopkinson Pressure Bar (SHPB) apparatus to determine their properties at high strain rates ($$350\, \textrm{s}^{-1}$$ 350 s - 1 to $$460\, \textrm{s}^{-1}$$ 460 s - 1 ). The variation in the Shock Energy (SE) absorbed by the laminates at various strain rates was analyzed as a function of the corresponding Transmission Loss employing regression. The dynamic stress-strain curves showed an increase in shock energy absorption at higher strain rates. The sequence SSP-IV and SSP-II showed the highest values of energy absorption as well as Transmission Loss.

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“…Friction at the specimen/bar interface is generally reduced by applying grease at the specimen ends, however radial or out-of plane stresses within the specimen are not evaluated with traditional methods and can be significant at high strain rates [17]. In more recent times, full-field imaging techniques have been integrated in split-Hopkinson bar experiments [5,6,18]. While this has improved strain measurement accuracy, inferring stress at high strain rates is still problematic because inertial effects are strong and the quasi-static equilibrium assumption is still required.…”

Section: Introductionmentioning

confidence: 99%

The Off-Axis IBII Test for Composites

Parry

Fletcher

Pierron

2020

J. dynamic behavior mater.

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Composite components regularly experience dynamic loads in service. Despite this, it is still difficult to obtain accurate mechanical properties of composite materials under high strain rate conditions. In this study, a new application of the Image-Based Inertial Impact (IBII) test methodology was developed, to generate an accurate in-plane transverse and shear moduli dataset from unidirectional (UD) off-axis composite specimens. The obtained dataset was consistent across different sample configurations, where results from the UD45$$^{\circ }$$ ∘ off-axis specimens agreed well with the UD90$$^{\circ }$$ ∘ values. Validation of the shear modulus identification was also undertaken by comparing the results from the UD90$$^{\circ }$$ ∘ and UD45$$^{\circ }$$ ∘ specimens with a multi-directional (MD) configuration. Here, it was found that MD±45$$^{\circ }$$ ∘ specimen shear modulus values where marginally lower than that from the UD specimens, in accordance with the lower fibre volume fraction of the MD laminate. Low strain rate sensitivities in the $$0.5-2\times$$ 0.5 - 2 × 10$$^{3}$$ 3 $$\hbox {s}^{-1}$$ s - 1 regime evidenced in this work suggest previously published data (often from split-Hopkinson bar tests) may include both a material and system i.e. testing apparatus response.

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Tracking Deformation History in Split Hopkinson Pressure Bar Testing

Cited by 6 publications

References 3 publications

Influence of the fastening between thread–test samples in the stress–strain curves in tensile dynamic tests

Influence of the fastening between thread–test samples in the stress–strain curves in tensile dynamic tests

Fiber metal laminates for high strain rate applications with layerwise shock impedance tuning

The Off-Axis IBII Test for Composites

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