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In this paper the effect of corrugated diaphragm on performance of MEMS microphone is described. The corrugated diaphragm is modeled in order to improve the sensitivity of micromachined silicon acoustic sensor. Analytical analyzes have been carried out to derive mathematic expressions for the mechanical sensitivity and displacement of corrugated diaphragm with residual stress. It is shown that ...

Indentation is a new method for estimating residual stress. The plastic behavior of the materials under study can affect indentation parameters and, thus, influences the results of residual stress measurement. In this paper, the effect of yield stress and work-hardening exponent on the accuracy of residual stress measurements in steels and aluminums was studied. Results showed that, for m...

In shot peening process the work piece surface is struck by a large number of balls and compressive residual stress is generated on the surface. So, mechanical properties such as fatigue strength, stress corrosion resistance, smooth shape and ... will improve. In this paper, the balls with a speed of 100 to 200 m/s were struck on the steel samples and fatigue strength compared with specimens wi...

the residual stresses in composite laminates depend on several factors including the conditions of fabricating process, property of materials, direction and lay-ups of the layers. however the thermo-elastic behavior of composite is one of the most important parameters affecting the magnitude of residual stresses. the elastic properties and residual stresses do not remain constant under cyclic t...

The influence of in-plane residual stress on Hertzian nanoindentation for single-crystal copper thin film is investigated using molecular dynamics simulations (MD). It is found that: (i) the yield strength of incipient plasticity increases with compressive residual stress, but decreases with tensile residual stress; (ii) the hardness decreases with tensile residual stress, and increases with co...

X-ray methods were used to measure the residual stress near a fracture surface of a sintered composite system of A&03/ Sic. A specimen bent at three points with different notch radii was used to measure h-acture toughness. Effects of the notch radii on the stress intensity factor Kp were measured during the initiation of the crack. Experimental results agreed with fracture mechanics theory.

Faculty of Mechanical Engineering, Sardar Raja College of Engineering, Alangulam, Tirunelveli 627 808, India Faculty of Mechanical Engineering, Government College of Engineering, Tirunelveli 627 007, India Faculty of Mechanical Engineering, Alagappa Chettiar College of Engineering and Technology, Karaikudi 630 002, India Structural Analysis and Testing Group, Vikram Sarabhai Space Centre, Triva...