Molecular dynamics simulations of single grain pure aluminum in a vice fixture for nanomanufacturing applications

Abstract

Although nano and macro manufacturing encompass two different scales of machining, investigating both is essential for understanding machining distortions and deformations. In both macro and nano fabrication, the fixture is the primary means of securing the workpiece in place while performing the manufacturing operations. Understanding the fixture design is a critical aspect relating the two different scales of manufacturing. This paper describes a method involving atomistic simulation for understanding machining distortions for the macro scale by investigation of nano machining and work holding devices. 2 This research aims to help bridge the knowledge gap in manufacturing of macro and nano scale applications. The simulations performed showed that the fixture influences the machining distortions and the critical stress concentrations on the workpiece.

Distortion of a poly-crystalline Al bar in a vice fixture: Molecular dynamics analysis of grain movement and rotation

“…The Al atoms interact via the Mendelev et al potential [33] with each other. The Al-carbon interaction is modeled by a purely repulsive potential obtained from a Lennard-Jones potential cut off at its minimum [29].…”

“…In the present paper, we will study the mechanical deformation of an Al bar which is compressed in an inhomogeneous way by vice plates [29], see Fig. 1a.…”

Distortion of a polycrystalline Al bar in a vice fixture: molecular dynamics analysis of grain movement and rotation

“…In a previous publication [31], this procedure was applied to a single-crystalline Al block where all surfaces were oriented in {100} directions. In the present work, however, we use polycrystalline Al blocks.…”

“…The Al atoms interact via the Mendelev et al potential [35] with each other. The Al-carbon interaction is modeled by a purely repulsive potential obtained from a Lennard-Jones potential cut off at its minimum [31].…”

“…In the present paper, we will study the mechanical deformation of an Al bar which is compressed in an inhomogeneous way by vice plates [31] (see Fig. 1a).…”