Design of an Impact Loading Machine Based on a Flywheel Device: Application to the Fatigue Resistance of the High Rate Pre-straining Sensitivity of Aluminium Alloys

Froustey, Catherine; Lambert, M.; Charles, Jean-Luc; Lataillade, Jean-Luc

doi:10.1007/s11340-007-9082-4

Cited by 30 publications

(18 citation statements)

References 12 publications

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“…A recent proposal [8] about using weaving techniques could be very useful to decrease time production of a sample (currently equal to one hour for one sample); • More tests at different strain rates are required to clearly identify the strain rate influence of SWEM. A specific flywheel device [12] could be Finally, the main question being the part of the friction in the shock absorption, it is needed to perform a simulation at the structure level. This simulation needs to take into account all contacts in the material and to handle high strains (up to 60%) during a dynamic compression loading.…”

Section: Figmentioning

confidence: 99%

Strain rate influence on mechanical behavior of a single wire entangled material

2018

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In a global context of energy saving, the ratio stiffness -mass is a key parameter for design of mechanical structures. To deal with this major concern, sandwich materials are finding an increasing use: the skins are designed to resist tensile and compressive stresses while the core needs to gather lightweight, shear stresses resistance and high mechanical energy absorption capacities. Firstly made of balsa wood, the core is nowadays classically realized using architectured materials (cellular materials, honeycombs, entangled materials, etc.). Entangled materials are architectured materials with tuneable properties, depending of the dedicated application. Several entangled materials already exist such as mineral or metallic wool; some of them are made of a single ductile metallic wire, entangled in all directions so that the final material becomes a porous continuous media. Such materials, which combine lightness and ductile behaviour, seem to be perfect candidates to dissipate energy during an impact. Compared to conventional materials such as balsa wood or honeycomb, a large amount of energy is indeed dissipated by friction coming from the numerous contacts due to the entanglement. The global aim of this work is focused on the study of energy dissipation mechanisms involved during impact as well as the correlation between architectural parameters of the material (wire diameter and material, volume fraction, etc.) and macroscopic behaviour. The first step that is presented here consists of an experimental investigation using dynamic compression tests to study macroscopic parameters (wire diameter, volume fraction, etc.) on absorbed energy.

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Section: Figmentioning

confidence: 99%

Strain rate influence on mechanical behavior of a single wire entangled material

2018

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“…The principle and associated measurement techniques of this device are described in (Froustey et al, 2007). It is possible to stretch specimens at medium or high strain rates (up to 10 3 s -1 ).…”

Section: Impact Devicementioning

confidence: 99%

Microstructure scaling properties and fatigue resistance of pre-strained aluminium alloys (part 1: Al–Cu alloy)

Froustey

Naimark

Bannikov

et al. 2010

European Journal of Mechanics - A/Solids

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The objective of this work is to provide the link between the fatigue behaviour of pre-strained aluminium alloys and the scaling properties of damage induced on the fracture surface. Fatigue tests performed on pre-strained aluminium alloys revealed a large difference in their residual fatigue resistance linked to the material: the Al-Cu alloy demonstrated a sharp decrease of HCF life-time due to the pre-straining whereas the insensitivity of the Al-Mg alloy was clear. For the Al-Cu alloy, the investigations made at a 'mechanical' scale allow us to associate the strain energy absorbed during the prior loading with the aspect of the surface and the residual HCF life-time. The statistical characterisation of the fatigue damaged zone was done from the measurement of the surface roughness. Scaling properties were established that allowed the conclusion of the universality of HCF damage kinetics as the mechanism controlling the sensitivity of Al-Cu alloy whatever the pre-straining history.

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“…FW systems have been successfully used to characterize the mechanical response of different materials at intermediate and high strain rates either compressively [3,4] or in tension [5][6][7]. The main advantage of such systems is that testing at the same average strain rate, the FW saves a significant amount of space.…”

Section: Introductionmentioning

confidence: 99%

On loading velocity oscillations during dynamic tensile testing with flying wheel systems

Erice

Roth

Gary

et al. 2015

EPJ Web of Conferences

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Abstract. Flying Wheels (FW) provide a space-saving alternative to Split Hopkinson Bar (SHB) systems for generating the loading pulse for intermediate and high strain rate material testing. This is particularly attractive in view of performing ductile fracture experiments at intermediate strain rates that require a several milliseconds long loading pulse. More than 50 m long Hopkinson bars are required in that case, whereas the same kinetic energy (for a given loading velocity) can be stored in rather compact flying wheels (e.g. diameter of less than 1.5 m). To gain more insight into the loading capabilities of FW tensile testing systems, a simple analytical model is presented to analyze the loading history applied by a FW system. It is found that due to the presence of a puller bar that transmits the tensile load from the rotating wheel to the specimen, the loading velocity applied onto the specimen oscillates between about zero and twice the tangential loading speed applied by the FW. The theoretical and numerical evaluation for a specific 1.1 m diameter FW system revealed that these oscillations occur at a frequency in the kHz range, thereby questioning the approximate engineering assumption of a constant strain rate in FW tensile experiments at strain rates of the order of 100/s.

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Design of an Impact Loading Machine Based on a Flywheel Device: Application to the Fatigue Resistance of the High Rate Pre-straining Sensitivity of Aluminium Alloys

Cited by 30 publications

References 12 publications

Strain rate influence on mechanical behavior of a single wire entangled material

Strain rate influence on mechanical behavior of a single wire entangled material

Microstructure scaling properties and fatigue resistance of pre-strained aluminium alloys (part 1: Al–Cu alloy)

On loading velocity oscillations during dynamic tensile testing with flying wheel systems

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