Plastic Bending of Circular Plates Symmetrically Loaded

Merckx, K.R.

doi:10.21236/ad0015030

Cited by 1 publication

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“…where, z is the distance from the neutral place. The plastic bending of the plate is modelled as formulated by Merckx [21]. The second stress invariant, S, is assumed to be a function of the second strain invariant, E, given by the following relationship [21], and as shown in figure 2(e)…”

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

confidence: 99%

“…From the assumption that r z is zero and the material is incompressible, the second stress and strain invariants in terms of radial and circumferential stresses and strain are given by [21]…”

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

confidence: 99%

“…Assuming the stress deviators to be proportional to the corresponding strain deviators, and using the stress-strain relationship defined by Eq. (8) and the stress equation 9, the principal stresses r r and r h are expressed in terms of the principal strains and are given by the following expressions [21]…”

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%

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

confidence: 99%

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

confidence: 99%

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