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Improvement of the Fatigue Life of Stainless Steel Specimens by Laser Shock Processing
摘要： An investigation concerning the influence of laser shock processing (LSP) of stainless steel specimens made of 03Kh22N6M2 steel for the fatigue life by finite element modeling was performed. The known experimental fatigue life parameters were compared with the data taken from the finite element modeling. A conforming comparison is observed between the numerical and experimental data. It was shown that the thickness of the specimen is an important parameter during application of the LSP technology. It was found that with the decrease in the specimen thickness the fatigue life, conditioned by the LSP application, improves significantly. It was shown that for thin specimens (about 2 mm) the application of the LSP technology improves the fatigue life to 300%.
关键词： residual stresses,finite element modeling,fatigue life,laser-shock-wave processing
更新于2025-09-11 14:15:04
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Determination of the Elastic Behavior of Silicon Nanowires within a Scanning Electron Microscope
摘要： Three-point bending tests were performed on double-anchored, ?110? silicon nanowire samples in the vacuum chamber of a scanning electron microscope (SEM) via a micromanipulator equipped with a piezoresistive force sensor. Nanowires with widths of 35 nm and 74 nm and a height of 168 nm were fabricated. The nanowires were obtained monolithically along with their 10 ??m tall supports through a top-down fabrication approach involving a series of etching processes. The exact dimension of wire cross sections was determined by transmission electron microscopy (TEM). Conducting the experiments in an SEM chamber further raised the opportunity of the direct observation of any deviation from ideal loading conditions such as twisting, which could then be taken into consideration in simulations. Measured force-displacement behavior was observed to exhibit close resemblance to simulation results obtained by finite element modeling, when the bulk value of 169 GPa was taken as the modulus of elasticity for ?110? silicon. Hence, test results neither show any size effect nor show evidence of residual stresses for the considered nanoscale objects. The increased effect of the native oxide with reduced nanowire dimensions was captured as well. The results demonstrate the potential of the developed nanowire fabrication approach for the incorporation in functional micromechanical devices.
关键词： SEM,silicon nanowires,three-point bending tests,finite element modeling,elastic behavior
更新于2025-09-09 09:28:46