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Atomic force microscopy (AFM) was used for visualization of a nano-oxidation technique performed on diamond-like carbon (DLC) thin film. Experiments of the nano-oxidation technique of the DLC thin film include those on nano-oxidation points and nano-oxidation lines. The feature sizes of the DLC thin film, including surface morphology, depth, and width, were explored after application of a nano-oxidation technique to the DLC thin film under different process parameters. A databank for process parameters and feature sizes of thin films was then established, and multiple regression analysis (MRA) and a back-propagation neural network (BPN) were used to carry out the algorithm. The algorithmic results are compared with the feature sizes acquired from experiments, thus obtaining a prediction model of the nano-oxidation technique of the DLC thin film. The comparative results show that the prediction accuracy of BPN is superior to that of MRA. When the BPN algorithm is used to predict nano-point machining, the mean absolute percentage errors (MAPE) of depth, left side, and right side are 8.02%, 9.68%, and 7.34%, respectively. When nano-line machining is being predicted, the MAPEs of depth, left side, and right side are 4.96%, 8.09%, and 6.77%, respectively. The obtained data can also be used to predict cross-sectional morphology in the DLC thin film treated with a nano-oxidation process. [ABSTRACT FROM AUTHOR]

Recently, enhance the mechanical property of nanocomposite were used by adding the nanotubes. The mechanical properties of the nanocomposite were affected by interfacial bonding energy between nanotubes and polymers. In this paper, the interfacial bonding energy and Young's moulds of single-walled nanotube (SWNT) reinforced epoxy composites were investigated using molecular dynamics (MD) simulations based on a cured epoxy resin model, which was constructed by incorporating three-dimensional crosslinks formed during curing reaction. The structure types of SWNT include the armchair, zigzag and chiral was used in this study. After simulation, adding SWNT in the epoxy resin really has been reinforced effect, and the larger chiral angle of SWNT the better to strengthen. The study also calculated the interfacial bonding energy between the epoxy and the SWNT affects the ability of strengthening to the composite of SWNT. Within the range of 273K-473K, the temperature has a little influence on Young's moulds of SWNT reinforced epoxy composites. [ABSTRACT FROM AUTHOR]

A Computer Aided Fixturing System (CAPS) was used in this paper to study the planning of modular fixtures for measurement using a Coordinate Measuring Machine (CMM). This paper proposes fixturing planning of a complicated small supporting face and a large general supporting face. Group Technology (GT) was used to establish the coding database of the modular fixture element for use in the system. Several algorithms are developed to locate the appropriate fixture elements and their positions. [ABSTRACT FROM AUTHOR]

This article focuses on the establishment of a cutting force calculation model in terms of nano-scale orthogonal cutting, and investigates the stress–strain distribution of single-crystal copper that occurs in terms of nano cutting. The cutting force that occurs during the nano-scale cutting of single-crystal copper, and also its changes under different situations, can be found in this study. The molecular dynamics (MD) model was proposed to evaluate the displacement components of the atom in any temporary situation on the nano-scale cutting. The atom and lattice were regarded as the node and element, respectively. The shape function concept of the finite element method (FEM) is used to calculate the equivalent strain of the nodal atom and element. The equivalent stress–strain relationship equation was acquired by nano-scale thin-film tensile simulation in this study, and was used to further calculate the equivalent stress that occurs under the equivalent strain. Subsequently, a stress–strain distribution during nano-scale orthogonal cutting can be acquired. [ABSTRACT FROM AUTHOR]