Longitudinal torsional coupled rotary ultrasonic–assisted drilling (LTC-RUAD) technology is introduced to improve the surface roughness of hole-wall and solve tear, burr, delamination carbon fiber–reinforced polymers (CFRPs) induced by large thrust force torque during conventional (CD). An experiment scale-span numerical investigation CFRPs were presented for both CD LTC-RUAD processes in this ...

Rotary ultrasonic drilling (RUD) has become an effective approach for machining advanced composites which are widely using in the field of aeronautics. The cutting kinematics and corresponding material removal mechanisms distinct different areas during RUD. However, these fundamentals have not been fully considered existing studies. In this research, two forms interaction induced by vibration w...

Rotary ultrasonic machining (RUM) has been considered as an effective approach in the manufacturing of advanced materials such ceramic matrix composite (CMC). However, distinct removal mechanisms RUM with different vibration forms not elucidated, which hinders adoption technology field material processing. In this research, ultrasonic-assisted scratching tests CMC were conducted to reveal funda...

AIM The aim of this study was to measure the increase in root canal surface area and canal transportation after biomechanical preparation at 1, 3, and 5 mm short of the apex with three different rotary systems in both continuous rotary and reciprocating rotary motions. MATERIALS AND METHODS Sixty freshly extracted human mandibular molars with mesial root canal curvatures between 20° and 30° w...

in order to comparison of weeds mechanical control for sugar beet, a rotary cultivator was designed and constructed in first year, and compared with other mechanical control in second year. five treatments, included: rotary hoe cultivator, furrower cultivator, rotary cultivator, no weeding and manual weeding were compared. experiment design was random complete blocks design (rcbd) with three re...

A polygon A in a configuration C is called rotary if C admits an automorphism which acts upon A as a one-step rotation. We study rotary polygons and their orbits under the group of automorphisms (and antimorphisms) of C. We determine the number of such orbits for several symmetry types of rotary polygons in the case when C is flag-transitive. As an example, we provide tables of flag-transitive ...