measurement-hand-transmitted-vibration-human-hand-arm-system-during

Measurement of the Hand Transmitted Vibration of the Human Hand Arm System During Operation of a Hand Tractor

Operators of hand tractors are exposed to high levels of hand transmitted vibration (HTV). This vibration, which can be both irksome and hazardous to ...

Chongqing University of Technology

A novel numerical manifold method was derived from the cubic B-spline basis function. The new interpolation function is characterized by high-order coordination at the boundary of a manifold element. The linear elastic-dynamic equation used to solve the bending vibration of thin plates was derived according to the principle of minimum instantaneous potential energy. The method for the initialization of the dynamic equation and its solution process were provided. Moreover, the analysis showed that the calculated stiffness matrix exhibited favorable performance. Numerical results showed that the generalized degrees of freedom were significantly fewer and that the calculation accuracy was higher for the manifold method than for the conventional finite element method. 

Numerical manifold method for the forced vibration of thin plates during bending.

The effects of grain boundary misorientation angle () on mechanical properties and the mechanism of plastic deformation of the Ni/NiAl interface under tensile loading were investigated using molecular dynamics simulations. The results show that the space lattice arrangement at the interface is dependent on grain boundary misorientations, while the interfacial energy is dependent on the arrangement. The interfacial energy varies in a W pattern as the grain boundary misorientation increases from 0° to 90°. Specifically, the interfacial energy first decreases and then increases in both segments of 0-60° and 60-90°. The yield strength, elastic modulus, and mean flow stress decrease as the interfacial energy increases. The mechanism of plastic deformation varies as the grain boundary misorientation angle () increases from 0° to 90°. When  = 0°, the microscopic plastic deformation mechanisms of the Ni and NiAl layers are both dominated by stacking faults induced by Shockley dislocations. When  = 30°, 60°, and 80°, the mechanisms of plastic deformation of the Ni and NiAl layers are the decomposition of stacking faults into twin grain boundaries caused by extended dislocations and the proliferation of stacking faults, respectively. When  = 90°, the mechanisms of plastic deformation of both the Ni and NiAl layers are dominated by twinning area growth resulting from extended dislocations.

Article	Year
Numerical manifold method for the forced vibration of thin plates during bending. TheScientificWorldJournal\| PubMed ID: 24883403
The Effects of Grain Boundary Misorientation on the Mechanical Properties and Mechanism of Plastic Deformation of Ni/NiAl: A Molecular Dynamics Study. Materials (Basel, Switzerland)\| PubMed ID: 33333827	2020

Jun Ding

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