Cutting tools are widely used in manufacturing processes and drilling is the most commonly used machining process. Although drill-bits used in drilling may not be expensive, their breakage can cause damage to expensive work piece being drilled and at the same time has major impact on productivity. Predicting drill-bit breakage, therefore, is important in reducing cost and improving productivity...

Owing to high specific strength and designability, unidirectional carbon fiber reinforced polymer (UD-CFRP) has been utilized in numerous fields to replace conventional metal materials. Post machining processes are always required for UD-CFRP to achieve dimensional tolerance and assembly specifications. Due to inhomogeneity and anisotropy, UD-CFRP differs greatly from metal materials in machini...

Abstract. The cutting mechanical properties of impregnated diamond bit depend on the performance its elements. Aiming at factors affecting element bit, laboratory rock breaking experiment micro is carried out. results show that work ratio and unit wear first decrease then increase with particle size concentration when drilling sandstone; efficiency resistance are highest 125 %. decreases increa...

The paper considers the maximum facilitation of rock breaking at a predetermined optimum pattern placement weapons and completeness saturation by cutter teeth. conditions for increasing productivity newly established drill bit obtaining desired effect in kinetic interpretation are given.

A recent proposal to address conflicts of interest in academic medical centers suggested that industry support of continuing medical education (CME) activities should be limited to contributions to a central fund that would disburse the money to programs accredited by the Accreditation Council for Continuing Medical Education. The authors of the proposal reason that this arrangement would " per...

Packet classification is one of the fundamental techniques required by various network management functionalities. As the state-of-the-art of software packet classification, decision-tree algorithms employ various geometrical cutting schemes to build optimized decision trees. However, existing cutting schemes cannot meet the desired performance on large rulesets because they sacrifice either cl...

The evaluation of hydraulics carried out in a trajectory namely 17 ½ inches provides an overview the hydraulic problems that occur with less-than-optimal pressure bit because it is less than minimum percentage value should be. which 50%. affected by factors such as flow rate. mud weight. rheology used and loss both surface sub-surface bit. pipe annulus. So, optimization BHHP (Bit Hydraulic Hors...

Abstract Bubbly flow still represents a challenge for large-scale numerical simulation. Among many others, the understanding and modelling of bubble-induced turbulence (BIT) are far from being satisfactory even though continuous efforts have been made. In particular, buoyancy bubbles generally introduces anisotropy in flow, which cannot be captured by standard eddy viscosity models with specifi...