scholarly journals Experimental study on residual stress of milling medical magnesium alloy

2018 ◽  
Vol 397 ◽  
pp. 012046
Author(s):  
Yang Qiao ◽  
Peiquan Guo ◽  
Shouren Wang ◽  
Xuefeng Yang
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Magnesium Alloy

Extensive Experimental Study on Diaphragm-Based Piezoelectric Microphone

1999 ◽  
Author(s):  
Meng-Nian Niu ◽  
Hong Zeng ◽  
Hai Yan ◽  
Eun Sok Kim
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Acoustic Pressure ◽  
Structural Integrity ◽  
Vertical Displacement ◽  
Active Area ◽  
Zno Film ◽  
Beam Laser ◽  
Acoustic Chamber ◽  
Focused Beam

Abstract This paper reports our extensive experimental study on diaphragm-based piezoelectric microphones fabricated on a silicon substrate. We have fabricated and carefully analyzed about 60 micromachined piezoelectric microphones (composed of piezoelectric ZnO film, insulating layers and electrodes) built on a low-stress silicon nitride diaphragm (with and without corrugation on the diaphragm and with five kinds of residual stress in the diaphragm). Microphone sensitivity is measured in an acoustic chamber with a B&K4135 microphone. Vertical displacement of a microphone diaphragm under an applied acoustic pressure is measured with a focused-beam laser Doppler displacement meter. Our results show that (1) corrugation releases both tensile stress and compressive stress effectively, and increases the center displacement greatly, (2) a good bending curvature in the active area is needed for a good microphone sensitivity, and (3) ZnO structural integrity is the major factor that affects the bending curvature in the active area.

Experimental Study of Residual Stress Formation Mechanism of 7050 Aluminum Alloy Sheet by Laser Shock Processing

2016 ◽  
Vol 43 (7) ◽  
pp. 0702008
Author(s):  
曹宇鹏 Cao Yupeng ◽  
徐影 Xu Ying ◽  
冯爱新 Feng Aixin ◽  
花国然 Hua Guoran ◽  
周东呈 Zhou Dongcheng ◽  
...  
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Aluminum Alloy ◽  
Alloy Sheet ◽  
Laser Shock ◽  
Aluminum Alloy Sheet ◽  
Laser Shock Processing ◽  
7050 Aluminum Alloy ◽  
Stress Formation ◽  
Shock Processing

Experimental Study on Residual Stresses of Al2O3 Coating by Laser Re-Melting

2010 ◽  
Vol 431-432 ◽  
pp. 446-449
Author(s):  
De Jun Kong ◽  
Kai Yu Luo ◽  
Hong Miao
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Tensile Stress ◽  
Residual Stresses ◽  
High Power ◽  
Bonding Strength ◽  
Strengthening Mechanism ◽  
Al2o3 Coating ◽  
Micro Hardness ◽  
Continuous Co2 Laser

The surface of Al2O3 coating sprayed on 40Cr substrate was re-melted with high power continuous CO2 laser, and its micro-hardness and residual stresses were measured, respectively. The strengthening mechanism of Al2O3 coating by laser re-melting was analyzed and discussed. The experimental results shown that the surface of Al2O3 coating by laser re-melting is neat and smooth, and its compositions are even, its structures are compact, and Al2O3 coating is evenly distributed in its surface with grain forms, and its micro-hardness increases about 200%; Residual stress of Al2O3 coating by laser re-melting is changed into compressive stress from tensile stress, which is benefit to improving bonding strength of coating-substrate interface.

scholarly journals Degraded and osteogenic properties of coated magnesium alloy AZ31; an experimental study

2016 ◽  
Vol 11 (1) ◽  
Author(s):  
Jinpeng Zhuang ◽  
Yongbin Jing ◽  
Yaming Wang ◽  
Jinghuai Zhang ◽  
Huanxin Xie ◽  
...  
Keyword(s):  
Experimental Study ◽  
Magnesium Alloy ◽  
Alloy Az31 ◽  
Magnesium Alloy Az31
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