Strain Evaluation and Fracture Properties of Hetero-Epitaxial Single Crystal 3C-SiC Squared Membrane

2014 ◽  
Vol 806 ◽  
pp. 11-14
Author(s):  
Ruggero Anzalone ◽  
Giuseppe D'Arrigo ◽  
Massimo Camarda ◽  
Nicolo’ Piluso ◽  
Francesco La Via
Keyword(s):  
Large Deflection ◽  
Strain Tensor ◽  
Applied Pressure ◽  
Bulge Test ◽  
Phonon Modes ◽  
Breaking Strain ◽  
Test Technique ◽  
Raman Analysis ◽  
Fracture Properties ◽  
The Relationship

The following paper explores the development the bulge test technique combined with the micro-Raman analysis and a refined load-deflection model for high quality 3C-SiC squared-membranes. By the minimization of the total elastic energy, starting from the isotropic relation between the stress tensor and the strain tensor, it is possible to calculate the relationship between the maximum deflection and the applied pressure, in both regime of small and large deflection. From the measured breaking pressure through the refined model it is possible to evaluate the breaking strain of the membrane. Furthermore, the relationship between the measured shift of Raman Transverse Optical (TO) phonon modes and the total residual strain (Δa/a) within the epitaxial 3C-SiC layer was found.

Evaluation of Mechanical and Optical Properties of Hetero-Epitaxial Single Crystal 3C-SiC Squared-Membrane

2014 ◽  
Vol 778-780 ◽  
pp. 457-460 ◽  
Author(s):  
Ruggero Anzalone ◽  
Giuseppe D'Arrigo ◽  
Massimo Camarda ◽  
Nicolo’ Piluso ◽  
Francesco La Via
Keyword(s):  
Large Deflection ◽  
Strain Tensor ◽  
Applied Pressure ◽  
Raman Shift ◽  
Bulge Test ◽  
Phonon Modes ◽  
High Quality ◽  
Test Technique ◽  
Raman Analysis ◽  
The Relationship

The aim of this work is to develop the bulge test technique combined with the micro-Raman analysis and a refined load-deflection model for high quality 3C-SiC squared-membranes. By the minimization of the total elastic energy, starting from the isotropic relation between the stress tensor and the strain tensor, it is possible to calculate the relationship between the maximum deflection and the applied pressure, in both regime of small and large deflection. Furthermore, the relationship between the measured shift of Raman Transverse Optical (TO) phonon modes and the total residual strain (Δa/a) within the epitaxial 3C-SiC layer was found and in order to understand the stress distribution within the membrane, TO Raman shift maps were performed along the corner and the border of the membrane.

Structural Reliability of SU-8 Material for MEMS Application

2005 ◽  
Author(s):  
S. B. Park ◽  
Soonwan Chung ◽  
Sandeep Makhar ◽  
Harold Ackler ◽  
Pinyen Lin
Keyword(s):  
Elastic Modulus ◽  
Structural Reliability ◽  
Applied Pressure ◽  
Strain Energy Release ◽  
Bulge Test ◽  
Membrane Thickness ◽  
Element Analysis ◽  
Interfacial Toughness ◽  
Dog Bone ◽  
The Relationship

Mechanical properties of SU-8 over the range of temperature, −50 to 250 °C, were measured. Traditional tension test is performed with the dog-bone specimens using microfabrication techniques. The bulk properties such as elastic modulus, Poisson’s ratio and tensile strength are obtained in various temperatures. Bulge test is performed using SU-8 membrane constrained by silicon wafer. Pressure is applied to the membrane, and by analyzing the deflection of membrane, the elastic modulus and residual stress of SU-8 thin film are acquired. The relationship between applied pressure and deflection is obtained by changing some geometric parameters such as membrane thickness and diameter. The interfacial fracture toughness between SU-8 and silicon will measured using the membrane structure. The interfacial toughness obtained from the experiments will be compared with the strain energy release rate from finite element analysis, and the failure analysis at the interface under the actual thermal fatigue environment will be investigated using a numerical model.

scholarly journals Investigation of Deformation Inhomogeneity and Low-Cycle Fatigue of a Polycrystalline Material

2021 ◽  
Vol 11 (6) ◽  
pp. 2673
Author(s):  
Mu-Hang Zhang ◽  
Xiao-Hong Shen ◽  
Lei He ◽  
Ke-Shi Zhang
Keyword(s):  
Cyclic Loading ◽  
Low Cycle Fatigue ◽  
Strain Tensor ◽  
Equivalent Strain ◽  
Differential Entropy ◽  
Strain Components ◽  
Deformation Inhomogeneity ◽  
Standard Deviations ◽  
Number Of Cycles ◽  
The Relationship

Considering the relationship between inhomogeneous plastic deformation and fatigue damage, deformation inhomogeneity evolution and fatigue failure of superalloy GH4169 under temperature 500 °C and macro tension compression cyclic loading are studied, by using crystal plasticity calculation associated with polycrystalline representative Voronoi volume element (RVE). Different statistical standard deviation and differential entropy of meso strain are used to measure the inhomogeneity of deformation, and the relationship between the inhomogeneity and strain cycle is explored by cyclic numerical simulation. It is found from the research that the standard deviations of each component of the strain tensor at the cyclic peak increase monotonically with the cyclic loading, and they are similar to each other. The differential entropy of each component of the strain tensor also increases with the number of cycles, and the law is similar. On this basis, the critical values determined by statistical standard deviations of the strain components and the equivalent strain, and that by differential entropy of strain components, are, respectively, used as fatigue criteria, then predict the fatigue–life curves of the material. The predictions are verified with reference to the measured results, and their deviations are proved to be in a reasonable range.

Measurement of Young's Modulus and Poisson's Ratio of Thin Film by Combination of Bulge Test and Nano-Indentation

2008 ◽  
Vol 33-37 ◽  
pp. 969-974 ◽  
Author(s):  
Bong Bu Jung ◽  
Seong Hyun Ko ◽  
Hun Kee Lee ◽  
Hyun Chul Park
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Young’S Modulus ◽  
Poisson’S Ratio ◽  
Young's Modulus ◽  
Applied Pressure ◽  
Indentation Test ◽  
Poisson's Ratio ◽  
Bulge Test ◽  
Nano Indentation

This paper will discuss two different techniques to measure mechanical properties of thin film, bulge test and nano-indentation test. In the bulge test, uniform pressure applies to one side of thin film. Measurement of the membrane deflection as a function of the applied pressure allows one to determine the mechanical properties such as the elastic modulus and the residual stress. Nano-indentation measurements are accomplished by pushing the indenter tip into a sample and then withdrawing it, recording the force required as a function of position. . In this study, modified King’s model can be used to estimate the mechanical properties of the thin film in order to avoid the effect of substrates. Both techniques can be used to determine Young’s modulus or Poisson’s ratio, but in both cases knowledge of the other variables is needed. However, the mathematical relationship between the modulus and Poisson's ratio is different for the two experimental techniques. Hence, achieving agreement between the techniques means that the modulus and Poisson’s ratio and Young’s modulus of thin films can be determined with no a priori knowledge of either.

Measurement of hydraulic conductivity in isolated arterioles of rat brain cortex

1993 ◽  
Vol 264 (6) ◽  
pp. H1788-H1797 ◽  
Author(s):  
M. Kimura ◽  
H. H. Dietrich ◽  
V. H. Huxley ◽  
D. R. Reichner ◽  
R. G. Dacey
Keyword(s):  
Hydraulic Conductivity ◽  
Rat Brain ◽  
Room Temperature ◽  
Applied Pressure ◽  
Unit Surface Area ◽  
Ph Change ◽  
Brain Vessels ◽  
Spontaneous Tone ◽  
Cerebral Arterioles ◽  
The Relationship

We have developed a new method for quantification of arteriolar hydraulic conductivity (Lp) from isolated rat brain vessels. The volume flux of water per unit surface area across the arteriole wall (Jv/S) was assessed from measurements of silicon oil drop movement within an occluded vessel at two to three pressures (between 20 and 70 mmHg); the Lp was derived from the slope of the relationship between Jv/S and applied pressure. Lp was measured in isolated cerebral arterioles 1) at room temperature (22 degrees C) without spontaneous vessel tone (control Lp; n = 11), 2) at room temperature with 10(-4) M adenosine (n = 5), and 3) at 37 degrees C with vessels dilated submaximally with 10(-4) M adenosine (n = 6). Lp at 22 degrees C without adenosine was 13.2 +/- 4.2 x 10(-9) (+/- SE) cm.s-1.cmH2O-1 for all vessels studied. Lp values ranged from 1.2 to 44.1 x 10(-9) cm.s-1.cmH2O-1 with a median value that was 5.9 x 10(-9) cm.s-1.cmH2O-1. Lp increased significantly (on average, 2.6-fold) with adenosine at 37 degrees C but not with adenosine at 22 degrees C. Control Lp bore no relationship to either the development of spontaneous tone or the diameter response to pH change, two recognized indicators of vessel viability.

Elasto-Plastic Large Deflection Analysis of a Copper Film

1992 ◽  
Vol 114 (2) ◽  
pp. 221-225
Author(s):  
J. H. Lau
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Plastic Strain ◽  
Mechanical Behavior ◽  
Effective Stress ◽  
Large Deflection ◽  
Applied Pressure ◽  
Copper Film ◽  
Engineering Practice ◽  
Deflection Analysis

The ductility of a copper film has been determined by an elastoplastic large deflection finite element method. The effective stress and incremental plastic strain and pressure-deflection curves of the copper film have also been provided for a better understanding of its mechanical behavior. Furthermore, for engineering practice convenience, the ductility and effective stress of the copper film have been plotted as functions of measurable variables, i.e., applied pressure and deflection at the center of the bulge.

Methods to improve reliability of bulge test technique to extract mechanical properties of thin films

2010 ◽  
Vol 50 (9-11) ◽  
pp. 1888-1893 ◽  
Author(s):  
H. Youssef ◽  
A. Ferrand ◽  
P. Calmon ◽  
P. Pons ◽  
R. Plana
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Bulge Test ◽  
Test Technique ◽  
Improve Reliability

scholarly journals Raman analysis of phonon modes in a short period AlN/GaN superlattice

2018 ◽  
Vol 115 ◽  
pp. 116-122 ◽  
Author(s):  
Ketaki Sarkar ◽  
Debopam Datta ◽  
David J. Gosztola ◽  
Fengyuan Shi ◽  
Alan Nicholls ◽  
...  
Keyword(s):  
Phonon Modes ◽  
Raman Analysis ◽  
Short Period

scholarly journals Experimental Study on the Effect of Offset Notch on Fracture Properties of Rock under Three-Point Bending Beam

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Qifeng Guo ◽  
Xinghui Wu ◽  
Meifeng Cai ◽  
Shengjun Miao
Keyword(s):  
Fracture Toughness ◽  
Experimental Study ◽  
Tensile Strength ◽  
Peak Load ◽  
Fracture Properties ◽  
Three Point Bending ◽  
Nominal Strength ◽  
Bending Load ◽  
The Relationship ◽  
Rock Beam

To investigate the effects of offset notch on the fracture properties of rock beam under bending load, granite beam specimens with “one single offset notch” and “central and offset double notches” are made. A series of three-point bending beam tests on the specimens are carried out by controlling the displacement rate of central notch. The whole load-displacement (P-CMOD) curves are obtained. Experimental results show that the larger the distance between the offset notch and beam central is, the larger are the peak load and nominal strength of the specimen. The peak load and nominal strength for the “central and offset double notches” specimens are both larger than those for the “single central notch” specimen. A fracture model considering the effect of offset notch is developed, and the relationship between the offset notch parameter, tensile strength, and fracture toughness is established.

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