Plastic Bending of Plates

Chakrabarty, J.

doi:10.1007/978-0-387-77674-3_4

Cited by 1 publication

(3 citation statements)

References 65 publications

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“…As shown in figure 2(a), the length of protrusion which occurs during this stage below the drill axis is very small, compared to the cross-sectional height of the plate as shown in figure 2(b). This situation is analogous to very small vertical deflection of a circular plate of large thickness, where the plasticity theory in conjunction with von-Mises yield criterion can be used to evaluate strain, stress and location of the crack at the bottom surface of the plate being drilled Chakrabarty, [20].…”

Section: Modeling Onset Of Protrusion and Formation Of Small Drill Capmentioning

confidence: 99%

“…The consideration of equilibrium condition of forces and moments on the circular section yields the following equations [20],…”

Section: Modeling Onset Of Protrusion and Formation Of Small Drill Capmentioning

confidence: 99%

“…(2). The geometric equations relating to strain and displacement for the radial and tangential strain are defined as [20] e r ¼ Àz…”

Section: Modeling Onset Of Protrusion and Formation Of Small Drill Capmentioning

confidence: 99%

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Analytical modeling of exit Burr in drilling of Ti6Al4V alloy

Rana

Dongre²,

Joshi

2019

Sādhanā

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Burrs affect precision components and cause assembly related problems, and in general, decrease manufacturing productivity. Drilling burr formation involves multiple stages that are influenced by variation in thrust forces, temperature, stress conditions, and deformation modes in the unsupported length of the workmaterial below the drill. Several of these have not been adequately investigated so far. Therefore, the objective of this work is to model the complex phenomena that occur just before the exit of the drill tip from the bottom surface of the hole, and up to the complete exit of the drill point from the work surface. Accordingly, two models have been developed: (i) to estimate onset of bending in conjunction with theory of plasticity, which leads to the formation of a small drill cap under the pressure of steady-state drilling thrust forces, and (ii) to evaluate exit burr size that involves stretching and bending of a thin layer below the drill tip, using the principle of energy conservation. It is observed that a fracture is initiated at the chisel edge corner resulting in the formation of a small drill cap. The exit burr size predicted by the model is within one standard deviation from the average burr height as determined from the experimental data.

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Section: Modeling Onset Of Protrusion and Formation Of Small Drill Capmentioning

confidence: 99%

“…The consideration of equilibrium condition of forces and moments on the circular section yields the following equations [20],…”

Section: Modeling Onset Of Protrusion and Formation Of Small Drill Capmentioning

confidence: 99%