This paper investigates the dynamical behavior of an assembled beam like structure with tip masses modeling a two stage space rocket structure. The beam like structure is composed of two beams connected together carrying two masses at the free ends to model the payload, and the stabilizing fins mass properties. The effect of non-homogeneity of the structure due to different cross section proper...

Abstract GLARE laminates are multi-layered metal-composite materials created from bonding sheets of metallic alloys with carbon or glass fibre layers. The application hybrid-conventional machining processes such as ultrasonic-assisted drilling (UAD) is becoming great interest to the aerospace industry due its capability in reducing cutting forces and tool wear which directly responsible for dri...

The correct positioning of deep wells to monitor groundwater and entrained contaminants is greatly aided by using remote sensing methods. The geologic setting at the Anniston Army Depot (ANAD) consists of a sequence of fractured dolostones and clastic rocks that have been thrust-faulted, creating a highly complex and heterogeneous aquifer. The drilling of deep bedrock groundwater monitoring wel...

In turning process, engineers are often faced with the problems of relating the cutting parameters (Speed, feed, depth of cut) to the output responses(Feed force, Thrust force, Cutting force, Surface roughness) to optimize the process. Also, Turing is done with the aim of achieving the best surface finish. But without optimization, it is not possible to automate the process. Turning process inv...

Permanent magnet linear synchronous motors (PMLSMs), which have great advantages, such as simple structure, high positioning accuracy, good performance, high thrust force density, high dynamic response, are widely used in high precision direct drive field. As a research focus and difficulty, the force ripper and dynamic characteristic of PMLSM is important for its performance. In this paper, th...

A comprehensive 3D finite element simulation study has been conducted to investigate the tool temperature distribution along cutting edge and chip formation during drilling of Ti6Al4V alloy by using commercial software Abaqus/Explicit. The Johnson–Cook material constitutive model failure criterion were implemented across formulations achieve in process. effect different mesh sizes on results wa...

To verify the feasibility and efficiency of rotary-percussive drilling assisted by waterjets in very hard rocks, experiments on the Ž . performance of polycrystalline diamond compact PDC cutters resisting different combined loads of static thrust, impact, cutting and waterjets on Missouri red granite and Halston limestone were investigated. The experiments were conducted by means of a Ž . drop ...