Amplitude dependent damping in electrodeposited nano-crystalline nickel after various heat treatments

Flejszar, A.; Mielczarek, Agnieszka; Vidrich, G.; Riehemann, W.

doi:10.1016/j.msea.2008.10.067

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…It is established in the mechanical testing community that the tensile test is not a reliable way to measure the Young's modulus [2] even for the much larger conventional specimens tested according to the current international tensile test standards, and that dynamic methods utilizing impact or resonant excitation give more accurate measures of the Young's modulus. These dynamic methods involve cyclic loading at strains typically on the order of 10 -5 to 10 -8 [12][13][14] which is 1 to 4 orders of magnitude smaller than the strains we can reliably measure in our tensile test set-up, particularly on micro-scale specimens such as the ones in this test program. The measurement issue for Young's modulus is discussed further in Section 7.…”

Section: High-and Low-strain Analysis For Obtaining Apparent Young's mentioning

confidence: 99%

US Army ARDEC Joint Fuze Technology Program (JFTP) task 2 report: quasi-static tensile tests of microfabricated electrodeposited (LIGA) Ni alloys

Liew¹,

Read²,

White³

et al. 2018

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The LIGA process (Lithographie, Galvanoformung, Abformung, or lithography, electrodeposition, shaping) offers the possibility of mass producing strong mesoscale (order of a few mm or less) metal components of nearly any planar shape. Multilayer deposition has been developed to create three-dimensional shapes. The overall objective of this multi-year project is to enable the use of the Johnson-Cook flow and fracture models for evaluation of structural elements made from two LIGA alloys of interest, by providing the material property data at the microscale needed to carry out structural analyses utilizing these models. This report documents the first milestone in the project, which is the measurement of the room-temperature tensile properties of two LIGA alloys of one commercial vendor's proprietary materials -one optimized for strength and the other for ductility, with nominal thicknesses 190 µm and 170 µm respectively -at strain rates 0.001/s and 1/s, utilizing four specimen geometries with gauge widths ranging from 75 µm to 700 µm. Test methods adapted to the scale of these materials were applied. Results, measurement uncertainties, and statistical variations for the ultimate tensile strength and apparent Young's modulus are quantified for all combinations of these material/geometry/rate variations. In addition, preliminary studies were conducted into the effects of low-temperature annealing on the materials' strength, and use of electron back scatter diffraction to observe the microstructure. Keywords Executive SummaryThis report presents the results of room-temperature tensile tests on microfabricated specimens of two LIGA Ni alloys of interest to the project sponsor and supplied by a commercial vendor. Microtensile specimens of the vendor's proprietary materials -"Alpha" and "C" -were supplied with nominal thicknesses of 190 µm and 170 µm, respectively, and of four different sizes with gauge widths ranging from 0.075 mm to 0.7 mm. The Alpha material is very strong, with consistent strength around 1900 MPa over several fabrication runs of the material. The C material has lower strength -around 600 MPa -and is more ductile. Both materials were tested at strain rates 0.001/s and 1 /s; Figure 1 shows typical engineering stress-strain curves. Small size-and rate effects were found in both materials in the ranges tested. Pin-loaded tensile specimens were used with general purpose tensile test apparatus consistent with the scale of the specimens. This approach succeeded in measurements of the strength and ductility. However, attempts to measure the Young's modulus were not fully successful because of large experimental uncertainties and a microplasticity phenomenon similar to that reported as material instability in the previous literature on LIGA Ni materials. Figure 1. shows stressstrain curves for 2 nominal specimens, one of each material, tested at the two strain rates. The Alpha material clearly exhibits much higher strength and lower ductility than the C material.(a) (b) Figure 1. Engineering stress-...

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Section: High-and Low-strain Analysis For Obtaining Apparent Young's mentioning

confidence: 99%

US Army ARDEC Joint Fuze Technology Program (JFTP) task 2 report: quasi-static tensile tests of microfabricated electrodeposited (LIGA) Ni alloys

Liew¹,

Read²,

White³

et al. 2018

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“…Concerning material damping, these effects have been determined for different metals: beryllium, 11 magnesium, 12–14 nickel, 15 niob, 16 zirconium, 17 as well as shape memory alloys. 18 The amplitude-dependent damping of common engineering materials, such as different types of c-steel and stainless steel as well as some of the aluminum alloys, has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Metal–plastic composites with amplitude-dependent constraint layer damping

Klaerner

Wuehrl

Kroll

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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For metal–plastic composites with thin shear-sensitive cores, high damping can be determined. These materials were developed to reduce the structure-borne noise and are therefore used for thin-walled components with bending loads. In addition to the known sensitivity due to the temperature and frequency, these materials show a significant dependency on vibration amplitudes. Within the framework of this study, the nonlinear damping of metal–plastic composites was determined experimentally using free-vibrating cantilever beams. A detailed analysis of the derived velocity–time curves showed a nonlinear damping within the decay. An exponential approach was successfully used to describe the relation between damping and current deflection. Furthermore, a strain energy-based evaluation is introduced to quantify the share of the core contributions. For this purpose, the strain energy of several acoustically sensitive car components as well as the beams with varying supports and vibration lengths were determined numerically with a finite element analysis. The strain energy ratio of the cores was then derived as a comparative measurement and within a finite element-based design of experiments. A cantilever beam setup with a component-specific beam length representing similar core strain energy ratios was retested and showed a similar exponential amplitude dependence but higher damping parameters.

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“…The higher damping capacity is thought to occur because of the alternate shrinkage and growth of pre-existing twins. The other possible ways to affect the damping properties of metallic materials is training-treatment [31], heat treatment [32] and dynamic lading [33]. Interestingly, internal friction in NC palladium can be affected by hydrogen isotops [34].…”

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confidence: 99%

Damping of nanocrystalline materials: a review

Muluykov¹,

Pshenichnuk²,

Baimova³

2015

LoM

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High defect concentration and non-equilibrium state of nanocrystalline materials can lead to considerable increase of damping capacity, thus the investigation of dumping of the nanocrystalline metals produced by severe plastic deformation is of high importance nowadays. In this review, the latest achievements on the studying of the damping and structure of nanocrystalline materials are discussed for different metals and alloys. The results for amplitude and temperature dependences on internal friction for nanocrystalline metals and alloys prepared by different methods are presented. The results received for amplitude dependence of internal friction are analyzed in the connection with the mechanisms of dissipation of grain and grain boundary dislocations. The comparison of Bordoni, Snoek-Koster and grain boundary peaks, which were found on the temperature dependence of the internal friction is presented for metals in two states: nanocrystalline and coarse grained. After a brief overview of the production of nanocrystaline materials, the focus is set on the damping and structure as well as some mechanical properties of these materials. Both experimental and theoretical investigations of damping capacity in connection with strength properties together with some typical examples are presented. Open issues in the development of nanocrystalline materials with high internal friction are discussed in the conclusion section.

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Amplitude dependent damping in electrodeposited nano-crystalline nickel after various heat treatments

Cited by 6 publications

References 15 publications

US Army ARDEC Joint Fuze Technology Program (JFTP) task 2 report: quasi-static tensile tests of microfabricated electrodeposited (LIGA) Ni alloys

US Army ARDEC Joint Fuze Technology Program (JFTP) task 2 report: quasi-static tensile tests of microfabricated electrodeposited (LIGA) Ni alloys

Metal–plastic composites with amplitude-dependent constraint layer damping

Damping of nanocrystalline materials: a review

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