Ductile Regime Grinding Brittle Materials

  • Machining Brittle Materials - Innovative Fabrication Inc.

    Dec 16, 2014· Ductile regime grinding is an effective machining process that has been used for brittle materials for several years now. In ductile regime grinding, material is removed through plastic deformation, which reduces the risk of fractures and compromised materials. Regime grinding also eliminates or minimizes the need for polishing and lapping ...

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  • CiteSeerX — Materials

    This process is known as ductile-regime grinding. When brittle materials are ground through a process of plastic deformation, surface finishes similar to those achieved in polishing or lapping are produced. Unlike polishing or lapping, however, grinding is a deterministic process, permitting finely controlled contour accuracy and complex shapes.

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  • NUMERICAL SIMULATION OF DUCTILE MACHINING OF …

    diamond turning of brittle materials like Silicon Nitride (Si3N4) have been reported as an alternative to finishing processes such as grinding and polishing [2,3]. Ductile machining of brittle materials, where material removal is by plastic deformation is possible at very low material removal rates, usually in the micrometer range [7,8].

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  • An analytical force and surface roughness model for ...

    workpiece surface was performed by some researchers, especially for brittle materials [1]. Accordingly, two different regimes were distinguished for ceramics grinding: ductile regime and brittle regime. The dominant mechanism during ductile and brittle grinding regimes are material pile-up and axial-lateral crack systems, respectively.

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  • Specif ic grinding energy as an in-process control ...

    In ultraprecision grinding of brittle materials, the transition from ductile-regime grinding to brittle-regime grinding that results from an increasing grinding grain depth of cut is accompanied by a reduction in the specific grinding energy. Furthermore, as the grain depth of cut is increased beyond the transition point into purely

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  • Ductile Regime Finish Machining - A Review | SpringerLink

    Experiments have shown that plastic flow can occur in ceramic materials, so they can be ductile machined. However, much needs to be determined in respect of the cutting conditions to enable this ductile behaviour to be successfully maintained throughout the machining processes such as turning or grinding.

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  • Ductile-Regime Grinding: A New Technology for Machining ...

    This process is known as ductile-regime grinding. When brittle materials are ground through a process of plastic deformation, surface finishes similar to those achieved in polishing or lapping are produced. Unlike polishing or lapping, however, grinding is a deterministic process, permitting finely controlled contour accuracy and complex shapes.

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  • Specific grinding energy as an in-process control variable ...

    Specific grinding energy as an in-process control variable for ductile-regime grinding Thomas G. Bifano* and Steven C. Fawcettt$ * Aerospace and Mechanical Engineering, Boston University, Boston, MA, USA, and f Precision Engineering Center, North Carolina State University, Raleigh, NC, USA This article addresses the problem of monitoring the material removal regime (ductile versus brittle ...

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  • Ductile-Regime Grinding of Brittle Materials | NIST

    Jan 01, 1997· Under appropriate conditions, brittle materials may be ground to produce surfaces with no observable fracture damage. This chapter reviews the techniques for... Ductile-Regime Grinding of Brittle Materials | NIST

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  • Grinding Brittle Materials | 2013-08-06 | Ceramic Industry

    Aug 07, 2013· The normal stress distribution profile associated with grinding a ductile material does not apply to grinding a brittle material like an advanced ceramic. Any induced tensile stress, which is usually caused by restricted thermal expansion at high temperatures, has already resulted in micro-cracking beneath the surface, as in a brittle material ...

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  • Ductility (Earth science) - Wikipedia

    The transition zone occurs at the point where brittle strength equals ductile strength. In glacial ice this zone is at approximately 30 m (100 ft) depth. Not all materials, however, abide by this transition. It is possible and not rare for material above the transition zone to deform ductilely, and for material below to deform in a brittle manner.

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  • PREDICTIVE MODELING FOR DUCTILE MACHINING OF …

    PREDICTIVE MODELING FOR DUCTILE MACHINING OF BRITTLE MATERIALS A Dissertation Presented to The Academic Faculty By Sivaramakrishnan Venkatachalam In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in the George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology December, 2007

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  • Ductile‐Regime Machining of Germanium and Silicon - Blake ...

    Precision machining of germanium and silicon was studied using single‐point diamond turning. Special attention was directed to the so‐called ductile regime wherein optical quality surface finishes can be machined directly on brittle materials.

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  • Surface Integrity Control During The Precision Machining ...

    Mar 29, 2006· Diamond turning, precision grinding, ductile regime machining, surface integrity. Ductile Machining of Brittle Materials. Hard and brittle materials such as glasses and ceramics are amongst the most difficult to machine.

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  • Ductile and Brittle Mode Grinding of Fused Silica

    There is a demand for high-efficiency and high surface integrity grinding of fused silica. Ductile grinding is an ideal method for producing a mirror finished surface on hard and brittle materials to significantly decrease polishing time. However, the fused silica is still difficult to ductile grind because of its high brittleness. A creep feed taper grinding method was applied to investigate ...

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  • Ductile or partial ductile mode machining of brittle materials

    For the ductile mode grinding of hard and brittle materials, the critical machining depth ranges from 50 nm to 1 m [20]. To perform ductile mode machining of brittle materials, machine tools with high-accuracy servomechanisms (resolution 1.25–10 nm), high loop stiffness, and full flood

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  • Ductile-Regime Grinding of Brittle Materials | NIST

    Standard Reference Materials (SRMs) Standards.gov; Time Services; Office of Weights and Measures ... Ductile-Regime Grinding of Brittle Materials Share. Facebook LinkedIn Twitter ... Publisher Info: Marcel Dekker, Inc., New York, NY. Pub Type: Books. Keywords . brittle materials, ductile-regime, Grinding . Process measurement & control. Created ...

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  • Brittle Removal Mechanism of Ductile Materials With ...

    With the brittle cracks remains, the finished surface quality of ultrahigh-speed machining is worse than that of high-speed machining. The results show that the material property undergoes ductile-to-brittle transition so the brittle regime machining of ductile materials …

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  • What are ductile and brittle materials? Explain with ...

    Ductile materials are those which can be drawn into wires when tension is applied , And can be drawn into sheet when compressive load is applied For the above mentioned properties the material should have a tendency to elongate i.e for lower value...

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  • Ductile Regime Mirror Finish Grinding of Ceramics with ...

    the other hand, the micro-brittle fracture mechanism results in surface fracture and fragmentation. Ductile regime grinding of ceramics is preferred since no grinding flaws are introduced if the machining is performed in this mode. A theoretical model, based on fracture mechanics theory, for the determination of surface flaws has been developed ...

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  • A review on ductile mode cutting of brittle materials ...

    Brittle materials have been widely employed for industrial applications due to their excellent mechanical, optical, physical and chemical properties. But obtaining smooth and damage-free surface on brittle materials by traditional machining methods like grinding, lapping and polishing is very costly and extremely time consuming.

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  • Brittle and Ductile Materials - EngArc - L

    Ductile materials deform much more than brittle materials. Brittle materials fail suddenly, usually with no prior indication that collapse is imminent. On the other hand, ductile materials, such as structural steel, normally undergo a substantial deformation called yielding before failing, thus providing a warning that overloading exists.

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  • Grinding Brittle Materials

    grinding ductile or brittle materials. In a brittle material, the “chips” are just smaller. The removal mecha-nism for a brittle material is achieved through micro-fracture and the sub-sequent removal of the chips by the next passing grain (see Figure 1).

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  • Study on grinding force modelling and ductile regime ...

    Ductile regime grinding, proposed by Bifano, is an important method for achieving high quality surfaces of hard brittle materials . Bifano also gave a theoretical description of the ductile grinding condition of different brittle materials, pointing out that ductile-regime grinding could be achieved by a …

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  • Ultraprecision, high stiffness CNC grinding machines for ...

    Under certain controlled conditions it is now possible to machine brittle materials such as glasses and ceramics using single or multi-point diamond tools (grinding), so that material is removed by plastic flow, leaving crack-free surfaces. This process is called 'shear' or 'ductile' mode grinding.

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  • T. G. Bifan o Department of Aerospace and Mechanical ...

    in the grinding of brittle materials. The results of this inves-tigation lend strong evidence in support of the ductile-regime grinding hypothesis. Also, a model is proposed, defining the brittle-to-ductile transition in terms of the material properties of the workpiece and the rate of material removal.

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  • (PDF) A review on ductile mode cutting of brittle materials

    grinding of brittle materials in a ductile mode had been. ... The subsurface deformation in the ductile removal regime is composed of plastic flow zone, micro crack zone and median cracks. The ...

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  • Ductile-Regime Grinding Of Brittle Materials: Experimental ...

    Ductile-regime grinding is a new technology made possible by the use of real-time control and precision engineering in the grinding process. By ensuring that the abrasive grinding forces do not exceed a threshold value, it is possible to grind materials that are normally considered "brittle" in such a way that the material removal takes place through plastic deformation rather than fracture.

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  • Influence of the Grinding Wheel in the Ductile Grinding of ...

    Empirical evidence has shown that grinding wheel characteristics significantly affect performance in the grinding of brittle materials. In this research a grit depth of cut model was developed based on a kinematic simulation of the grinding process.

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  • Ductile or Partial Ductile Mode Machining of Brittle Materials

    [3] Z.W.Zhong in his paper on ductile or partial ductile mode machining of brittle materials discussed the machining mode for silicon, glass, and some advanced ceramics. Scanned electron ...

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