Effect of loading rate on the fracture toughness and failure mechanisms of polycrystalline diamond (PCD)

McNamara, Declan; Carolan, Declan; Alveen, Patricia; Murphy, Neal

doi:10.1016/j.ijrmhm.2016.06.011

Cited by 23 publications

(5 citation statements)

References 29 publications

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“…The data are visually represented in Figure 3 along with the high deformation rate failure loads. The above indicates the threshold force for failure is lower at lower deformation rate, whereas McNamara et al showed that for single edge notch beams made from a single grain size PCD cutter fracture toughness decreased with increasing deformation rate [2].…”

Section: Loading Force Comparisonmentioning

confidence: 95%

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Impact Failure of Polycrystalline Diamond Cutters

2021

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Polycrystalline Diamond (PCD) Cutters are ultra-hard tools used for oil and gas drilling. These tools can fail in the form of spalling due to impact. In this paper, direct impact and quasi-static loading are used to investigate the failure force for leached PCD cutters when loaded at an angle on the edge of their chamfer with a PCD striker or platen. Impact experiments were performed using an impedance match system which ensures the sample is only loaded once; this allows subsequent analysis of the failure surfaces. The failure force at high deformation rate is around 8 kN and at low deformation rate 6.3−+2.3 kN. The failure force required for spalling increases with increasing deformation rate. High speed imaging is also used to explore the failure history of the cutters.

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Section: Loading Force Comparisonmentioning

confidence: 95%

“…The leaching process uses acid to remove the binder from between the grains in a layer near the surface. This has the effect of reducing the fracture toughness of the PCD [2] but increases the tool life in standard smooth wear operation [3].…”

Section: Introductionmentioning

confidence: 99%

Impact Failure of Polycrystalline Diamond Cutters

2021

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“…Besides, PCD cutting tools are characterized by difficulties in obtaining similar geometries of the surface during the manufacturing process [70]. What is also essential, the high brittleness of PCD can cause to the premature tool catastrophic failure [71,72]. Regardless of the presented drawbacks, PCD cutting tools are widely used because of very high abrasion resistance [73,74].…”

Section: Introductionmentioning

confidence: 99%

Study on Technological Effects of a Precise Grooving of AlSi13MgCuNi Alloy with a Novel WCCo/PCD (DDCC) Inserts

et al. 2020

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The WCCo/PCD (Diamond Dispersed Cemented Carbide—DDCC) manufactured with the use of PPS (pulse plasma sintering) are modern materials intended for cutting tools with the benefits of tungsten carbides and polycrystalline diamonds. Nevertheless, the cutting performance of DDCC materials are currently not recognized. Thus this study proposes the evaluation of technological effects of a precise groove turning process of hard-to-cut AlSi13MgCuNi alloy with DDCC tools. The conducted studies involved the measurements of machined surface topographies after grooving with different cutting parameters. In addition, the tool life and wear tests of DDCC inserts were conducted during grooving process and the obtained results were compiled with values reached during machining with cemented carbide tools. It was also proved that grooving of AlSi13MgCuNi alloy with DDCC inserts enables 5 times longer tool life and almost 3-fold increase of cutting path compared to values obtained during grooving with H3 and H10 cemented carbide inserts. Ultimately, the feed value of f = 0.15 mm/rev and cutting speed in a range of 800 m/min ≤ vc ≤ 1000 m/min during grooving with DDCC inserts can be defined as an optimal machining parameters, enabling the maximization of tool life and improvement in surface quality.

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“…Actually, the wear mechanism was found to be dependent on both the material type and the loading conditions, such as the chemical reaction in machining Si and steel [5,6], graphitization under high pressure [3,7], as well as micro or macro fracture during the machining process [8]. However, few research was conducted on the combining effects of the friction induced temperature and high pressure during the dynamic loading condition [9,10]. Under the high loading speed, micro-fracture and graphitization of the sharp tip can be induced, and the chemical wear under the dynamic loading condition become even more serious [11,12].…”

Section: Introductionmentioning

confidence: 99%