SUMMARY The use of composite laminates in complex structures has increased significantly. However, there are still some issues when considering their use, mainly related with machining, leading to some difficulties and lack of acceptance. In this work, a methodology to evaluate drill geometry and feed rate based on thrust force and delamination extension is presented. INTRODUCTION For the past ...

Drilling is a widely used machining process. As the hole drilling operation progresses, a drill-bit gradually degrades until it breaks at the end of its life. Replacing a drill-bit after it is breakage can be costly in certain special applications. At the same time an early tool replacement decision may lead to lower tool life utilisation. This calls for methods that enable accurate prediction ...

The frictional resistance on a fault during slip controls earthquake dynamics. Friction dissipates heat during an earthquake; therefore, the fault temperature after an earthquake provides insight into the level of friction. The Japan Trench Fast Drilling Project (Integrated Ocean Drilling Program Expedition 343 and 343T) installed a borehole temperature observatory 16 months after the March 201...

A theoretical framework is established for constructing arbitrary particle-laden jetflow by means of fractal sets in the sense of average scale. This novel approach involves three main coherent components, in which one (1) searches for an appropriate original point set and confirms its intrinsic properties such as chaos, symmetry and density distribution; (2) derives governing equations for the...

This study focuses on the examination of effect cutting parameters surface roughness when drilling medium-density fiberboard (MDF) with a parallel robot. Taguchi technique was applied to find optimum and, later, processing. Experimental layout established using L18 orthogonal array, and experimental data were examined via statistical analysis variance (ANOVA). results performed by multiple regr...

Determination of the borehole and fracture initiation positions is the main aim of a borehole stability analysis. A wellbore trajectory optimization with the help of the mud pressure may be unreasonable since the mud pressure can only reflect the degree of difficulty for the initial damage to occur at the wellbore rather than the extent of the wellbore damage. In this work, we investigate...

Scheduling in the drilling operation of the printed circuit board industry deeply annoys the production management staff on the shop floor due to its high complexity of permutations or combination of jobs, machines, and resource constraints. In this research, two multi-objective genetic algorithms are proposed to deal with such a complicated real-world case. Real-world instances are applied as ...

During the past decade, polymer nanocomposites have emerged relatively as a new and rapidly developing class of composite materials and attracted considerable investment in research and development worldwide.Direct machining of polymers can be an option for personalized products and for manufacturing product samples. To obtain high quality products and reduce machining costs, it is very importa...

Progress in Petrochemical Science Study of Formation Damage Mechanism Affected by Drilling Fluid Lost During the Operation Using Special Additives Materials Kioumars Taheri* and Farhad Mohammad Torab Department Mining Metallurgical Engineering, Yazd University, Iran *Corresponding author: Taheri, Yazd, Submission: October 21, 2022;Published: January 10, 2023 DOI: 10.31031/PPS.2023.04.000597 ISS...