Deviation of mechanical behavior in microforming from continuum scaling: A geometrically necessary dislocation storage perspective

Zhang, Bin; Meng, Andrew C.; Meng, W. J.

doi:10.1016/j.ijmachtools.2021.103795

Cited by 11 publications

(2 citation statements)

References 46 publications

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“…Moreover, grain refinement can reduce the size effects on material flow behavior. Zhang [3] investigated the difference between mechanical properties during microforming and macroforming, and using EBSD, observed that the anomalies in microforming were caused by the interaction between GNDs and grains in polycrystalline copper. Pagnoncelli [4] proposed a new model for the assessment of size effects affecting the fracture strength of brittle materials.…”

Section: Iintroductionmentioning

confidence: 99%

Influence of Diamond Tool Quality on Surface Roughness and Methods of Improving Surface Roughness

Zhuang

Liu²,

Zong³

et al. 2023

Preprint

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Spherical/aspherical mirrors are widely used in optical and imaging systems, but their reflectivity is influenced by the surface roughness values. In this paper, the influence of the quality of diamond tool on the surface roughness of workpiece is systematically studied. The quality of diamond tools can be divided into two categories: the waviness of tool tip and the quality of cutting edge of diamond tools. The full arc waviness of diamond tools is obtained by Gauss filtering method, and the evaluation accuracy is equivalent to that of commercial testing equipment. According to Hertz contact theory and three-dimensional topography of diamond cutting edge surface, the friction coefficient model between cutting edge and workpiece is established. According to the stress of the material, the relationship between the three-dimensional shape of the cutting edge and the elastic recovery is obtained. Passivating the cutting edge of the tool improves the quality of the cutting edge and finally improves the quality of the machined surface. In order to ensure the waviness of the tool tip arc, this paper puts forward a method to restrain the wear of diamond tools. In order to restrain tool wear, the combination of diamond tool crystal plane and diamond material were optimized in this paper. Through the above theoretical analysis and influence law, it can provide guidance for the subsequent high-quality machining of spherical/aspheric surfaces.

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Section: Iintroductionmentioning

confidence: 99%

Influence of Diamond Tool Quality on Surface Roughness and Methods of Improving Surface Roughness

Zhuang

Liu²,

Zong³

et al. 2023

Preprint

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show abstract

“…As the external specimen dimension decreases to the micron range, flow stress is also observed to increase with decreasing size in the absence of a strain gradient ( 2 ), when deformation becomes dominated by dislocation nucleation rather than dislocation interaction ( 3 ). The influence of strain gradients on plastic deformation is not only apparent in specialized experiments, e.g., nano/microindentation ( 4 ) and microbending of foils ( 5 ), but also manifests in microscale metal manufacturing technology applications, including molding ( 6 , 7 ), extrusion ( 8 , 9 ), wire drawing ( 10 ), and rolling ( 11 ). Furthermore, recent modeling work suggests that strain gradient effects enhance the resistance to plastic buckling of columns as the characteristic column dimension approaches the micron scale ( 12 ).…”

mentioning

confidence: 99%

Toward the development of plasticity theories for application to small-scale metal structures

Zhang,

Nielsen,

Hutchinson

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Experiments are performed on micron-scale single-crystal prototypical structural elements experiencing combined torsion and bending to gather data on their load-carrying capacity in the range of size and strain relevant to micron-scale structures for which little data are available. The observed strengthening dependence on size for the structural elements is in general accord with trends inferred from prior tests such as indentation and pure torsion. In addition, the experiments systematically reveal the strengthening size-dependence of structural elements whose surface has been passivated by a very thin Cr coating, an effect shown to have substantial strengthening potential. A state-of-the-art strain gradient plasticity theory is used to analyze the structural elements over the entire range of size and loading. While the computed trends replicate the experimental trends with reasonable fidelity, the predictive exercise, which is representative of those that will be required in micron-scale structural analysis, brings to light constitutive and computational issues which will have to be addressed before micron-scale plasticity theory can serve as effectively at the micron scale as conventional plasticity does at larger scales.

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Preparation and forming mechanism of ultrathin-walled Ni-Cu alloy tubes with submicrometer structures by ball spinning

Wang

et al. 2022

Int J Adv Manuf Technol

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Deviation of mechanical behavior in microforming from continuum scaling: A geometrically necessary dislocation storage perspective

Cited by 11 publications

References 46 publications

Influence of Diamond Tool Quality on Surface Roughness and Methods of Improving Surface Roughness

Influence of Diamond Tool Quality on Surface Roughness and Methods of Improving Surface Roughness

Toward the development of plasticity theories for application to small-scale metal structures

Preparation and forming mechanism of ultrathin-walled Ni-Cu alloy tubes with submicrometer structures by ball spinning

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