Wave propagation effects in dynamic loading

Albertini, C.; Montagnani, M.

doi:10.1016/0029-5493(76)90056-x

Cited by 37 publications

(10 citation statements)

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“…The split-Hopkinson bar, which may be used in compression, tension and torsion testing, seems to be the most widespread method for material characterization at the crash relevant strain rates because a rather well-defined stress and strain state is feasible (e.g. Harding et al, 1960;Lindholm and Yeakley, 1968;Albertini and Montagnani, 1976;Nicholas, 1981;Staab and Gilat, 1991;Thakur et al, 1996;Verleysen and Degrieck, 2004).…”

Section: Introductionmentioning

confidence: 99%

Stress–strain behaviour of aluminium alloys at a wide range of strain rates

Chen

Clausen

Hopperstad

et al. 2009

International Journal of Solids and Structures

219

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a b s t r a c tThe stress-strain behaviour of extruded AA6xxx and AA7xxx aluminium alloys in T6 temper was studied at a wide range of strain rates. Tensile tests at low to medium strain rates were performed in a standard tensile test machine, while a split-Hopkinson tension bar was used to carry out tests at high rates of strain. Extruded aluminium alloys have anisotropic mechanical properties, and tests were therefore done in three directions with respect to the extrusion direction. It is found that the AA6xxx alloys exhibit no significant rate sensitivity in the stress-strain behaviour, while moderate rate sensitivity was found for the AA7xxx alloys. There seems to be no significant difference between the rate sensitivity in the three tensile directions. The experimental data were used to identify the parameters of a thermo-viscoplastic constitutive relation for the extruded alloys, which includes the effects of strain hardening, strain-rate hardening, thermal softening and plastic anisotropy.

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Section: Introductionmentioning

confidence: 99%

Stress–strain behaviour of aluminium alloys at a wide range of strain rates

Chen

Clausen

Hopperstad

et al. 2009

International Journal of Solids and Structures

219

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“…The development of the tension version of the MHB took place at the beginning of 1970s, as described in [5][6][7]19,20] and in the patents listed in [4]. Its schematic is presented in figure 2.…”

Section: The Modified Hopkinson Bar For Tension Testingmentioning

confidence: 99%

“…Owing to the applied science character of the research conducted at the JRC, the new Hopkinson bar was patented in the years 1973-1974 [4]. The first results obtained with this modified Hopkinson bar (MHB) were published in the years 1974-1983 [5][6][7][8]. They concerned austenitic and ferritic virgin steels used in experiments of down-scaled reactor containment shell models subjected to explosion and served to validate numerical simulation predictions [8].…”

Section: Introductionmentioning

confidence: 99%

Advances in the Hopkinson bar testing of irradiated/non-irradiated nuclear materials and large specimens

Albertini

Cadoni

Solomos

2014

Phil. Trans. R. Soc. A.

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A brief review of the technological advances of the Hopkinson bar technique in tension for the study of irradiated/non-irradiated nuclear materials and the development of this technology for large specimens is presented. Comparisons are made of the dynamic behaviour of non-irradiated and irradiated materials previously subjected to creep, low cycle fatigue and irradiation (2, 10 and 30 displacements per atom). In particular, complete results of the effect of irradiation on the dynamic mechanical properties of AISI304L steel, tested at 20, 400 and 550°C are presented. These high strain rate tests have been performed with a modified Hopkinson bar (MHB), installed inside a hot cell. Examples of testing large nuclear steel specimens with a very large Hopkinson bar are also shown. The results overall demonstrate the capability of the MHB to efficiently reproduce the material stress conditions in case of accidental internal and external dynamic loadings in nuclear reactors, thus contributing to the important process of their structural assessment.

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“…The high strain-rate tests have been performed using a Split Hopkinson Tensile Bar [6] that consists of two cylindrical high strength steel bars, having a diameter of 10 mm, with a length of respectively 9 and 6 meters for the input and the output bar, as represented in figure 3. The aluminium specimen is assembled between the two bars.…”

Section: High Strain Ratementioning

confidence: 99%

“…Having fulfilled the conditions i) and ii) and being the two bars elastically loaded the one-dimensional elastic plane stress wave propagation theory can be applied to the input bar-specimen-output bar system as it is extensively 05004-p.2 shown in [5,6]. In these papers the three relationships are proofed which allow to calculate the stress, the strain and the strain rate in the specimen material versus time from the records of the incident (ε I ), the reflected (ε R ) and the transmitted (ε T ) pulses.…”

Section: High Strain Ratementioning

confidence: 99%

Strain rate effects on mechanical properties in tension of aluminium alloys used in armour applications

Cadoni

Dotta

Forni

et al. 2012

EPJ Web of Conferences

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Abstract. The mechanical properties in tension of two aluminium alloys (AA5059-H131 and AA7039-T651) used in armour applications were determined from tests carried out over a wide range of strain-rates on round specimens. The experimental research was developed in the DynaMat laboratory of the University of Applied Sciences of Southern Switzerland. The target strain rates were set at the following four levels: 10 −3 , 30, 300 and 1000 s −1 . The quasi-static tests were performed with a universal electromechanical machine, whereas a hydro-pneumatic machine and a Split Hopkinson Tensile Bar apparatus were used for medium and high strain-rates respectively. The required parameters by the Johnson-Cook constitutive law were also determined.

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Wave propagation effects in dynamic loading

Cited by 37 publications

References 1 publication

Stress–strain behaviour of aluminium alloys at a wide range of strain rates

Stress–strain behaviour of aluminium alloys at a wide range of strain rates

Advances in the Hopkinson bar testing of irradiated/non-irradiated nuclear materials and large specimens

Strain rate effects on mechanical properties in tension of aluminium alloys used in armour applications

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