Effect of TSV density on local stress concentration: Micro-Raman spectroscopy measurement and Finite Element Analysis

2013 ◽  
Vol 106 ◽  
pp. 139-143 ◽  
Author(s):  
F. Le Texier ◽  
J. Mazuir ◽  
M. Su ◽  
L. Castagné ◽  
J.-C. Souriau ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Raman Spectroscopy ◽  
Finite Element ◽  
Stress Concentration ◽  
Local Stress ◽  
Element Analysis ◽  
Local Stress Concentration ◽  
Micro Raman Spectroscopy ◽  
Spectroscopy Measurement

Design by Finite Element Analysis on Tubesheet of Heat Exchanger With a Central Hole

2011 ◽  
Author(s):  
Guo Li ◽  
Jianping Zhao
Keyword(s):  
Heat Transfer ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Stress ◽  
Heat Exchanger ◽  
Local Stress ◽  
Central Hole ◽  
Shell Side ◽  
Element Analysis ◽  
Local Stress Concentration

As one of major components of heat exchanger, tubesheet is of paramount importance to enhance the safety of heat exchanger whether its design is reasonable. As the diversity of the heat exchangers’ operating condition, structures of tubesheets also become very special. A fixed tubesheet heat exchanger with a central pipe whose diameter is greater than other heat exchanger tubes is presented in this paper. A central hole in tubesheet will weaken the stiffness and intensity of the tubesheet and cause local stress concentration along the central hole’s edge. However, there is no design method for this kind of tubesheet with a central hole and it is unable to be calculated using various international standards available. In this paper, finite element analysis code ANSYS is used to simulate the real complex structure, real loads and boundary conditions of the tubesheet so that the design problem can be visualized. The three-dimensional finite element model of the tubesheet is built considering the influence of tube channel, partial shell and heat transfer tube bundle. The different pressure in shell-side and tube-side will cause the mechanical stress. The temperature gradient exists widely and the tubesheet, shell as well as heat transfer tubes can’t transform freely. Therefore, there may exists high thermal stress due to the high temperature difference in shell-side and tube-side. The thermal stress has great impact on the total stress distribution. So the simulation of the temperature field is very important. By means of thermal analysis coupling with structure analysis, the distribution of temperature, stress and deformation is obtained. Through evaluating the stress intensity of the tubesheet, it is found that the dangerous region is located at the edge of the tube distribution region and local stress concentration along the edge of the central hole is not obvious. The result shows that the tubesheet is appropriately designed and the design by finite element analysis method is feasible. This paper provides a solution for this kind of structure’s analysis design in engineering application.

Micro-Raman Study of Stress Distribution and Thermal Relaxation of Oxidized Silicon Membranes

1996 ◽  
Vol 444 ◽  
Author(s):  
C. Malhaire ◽  
Y. Guyot ◽  
M. Le Berre ◽  
B. Champagnonn ◽  
A. Sibai ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Raman Spectroscopy ◽  
Finite Element ◽  
Stress Distribution ◽  
Pressure Sensors ◽  
Biaxial Stress ◽  
Membrane Thickness ◽  
Element Analysis ◽  
Membrane Area ◽  
Micro Raman Spectroscopy

AbstractComposite SiO2/Si membranes are used in various type of sensors among them, resonant and pressure sensors. However due to a large thermal mismatch, residual induced stresses may affect the devices long term reliability especially for thin membranes (˜5 μm). In this study, we have characterized test structures consisting of SiO2/Si membranes with respective thickness ratio between 2 and 10. Micro-Raman Spectroscopy, well known to be an accurate, non destructive method to determine residual stresses in microelectronic devices, has shown to be a powerful testing technique to measure local stresses on micromachined structures such as membranes, with a high spatial (10 μm2 ) and stress resolution (8 MPa). At room temperature, Raman line (520 cm−1) shifts between 0.05 and 1 cm−1 are observed. Highest frequency shifts of 1cm−1 corresponds to a 230 MPa biaxial stress. Finite Element analysis (ANSYS) was used to model the thermal stress distribution over the micromachined bilayer membrane, yielding a satisfactorily agreement with the experimental results over a large membrane area. The Finite Element analysis was correlated with optical profilometer deflection measurements. Membrane deflections up to 48 μm (more than 10 times the membrane thickness) have been measured. Furthermore, Micro-Raman Spectroscopy results up to 300°C are shown and related to temperature dependent deflection measurements.

Stress Analysis and Structure Optimization for the Opening Flat Cover of Pressure Vessels

2012 ◽  
Vol 538-541 ◽  
pp. 3253-3258 ◽  
Author(s):  
Jun Jian Xiao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Analysis ◽  
Structure Optimization ◽  
Pressure Vessels ◽  
Secondary Stress ◽  
Element Analysis ◽  
Primary Stress ◽  
Flat Cover

According to the results of finite element analysis (FEA), when the diameter of opening of the flat cover is no more than 0.5D (d≤0.5D), there is obvious stress concentration at the edge of opening, but only existed within the region of 2d. Increasing the thickness of flat covers could not relieve the stress concentration at the edge of opening. It is recommended that reinforcing element being installed within the region of 2d should be used. When the diameter of openings is larger than 0.5D (d>0.5D), conical or round angle transitions could be employed at connecting location, with which the edge stress decreased remarkably. However, the primary stress plus the secondary stress would be valued by 3[σ].

An Estimation Formula of the Stress Concentration Factor of the Butt-Welded Joint

2007 ◽  
Vol 353-358 ◽  
pp. 1995-1998
Author(s):  
Byeong Choon Goo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Gas Metal Arc Welding ◽  
Element Analysis ◽  
Butt Weld ◽  
Estimation Formula ◽  
Metal Arc Welding ◽  
Concentration Factors ◽  
Stress Concentration Factors

The purpose of this paper is to develop an estimation formula of stress concentration factors of butt-welded components under tensile loading. To investigate the influence of weld bead profiles on stress concentration factors of double V groove butt-welded joints, butt-welded specimens were made by CO2 gas metal arc welding. And the three main parameters, the toe radius, flank angle and bead height were measured by a profile measuring equipment. By using the measured data, the influence of three parameters on the stress concentration factors was investigated by a finite element analysis. It is shown that the three parameters have similar effects on the stress concentration factors. According to the simulation results, a formula to estimate the stress concentration factors of butt-weld welded structures was proposed and the estimated concentration factors from the formula were compared with the results obtained by the finite element analysis. The two results are in a good agreement.

Study on Production-Oriented Design for the Capesize Bulk Carrier: Using Transverse Reinforced Double-Bottom Pipe Duct

2006 ◽  
Vol 22 (01) ◽  
pp. 15-20
Author(s):  
Shou-Hsiung (Vincent) Hsu ◽  
Jong-Shyong Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Vertical Deflection ◽  
Bulk Carrier ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Bulk Carriers ◽  
Reducing Costs ◽  
Steel Weight

Cutting total man-hours is one of the most effective ways of reducing costs in a shipyard and, in general, designing structures with fewer pieces will achieve the goal of reducing man-hours. The Capesize bulk carrier, due to requirements for access, ballast capacity, and double-bottom height, always has a pipe duct in the center part of the double bottom. Comparison between two existing Capesize bulk carriers reveals that one may eliminate more than 1,800 structural pieces (about 2.6% of the total number of ship pieces) if the conventional longitudinal reinforced pipe duct is replaced by a transverse reinforced one. Further, from the finite element analysis (FEA) results using the SafeHull computer package of the American Bureau of Shipping (ABS), it has been found that the vertical deflection and stress concentration of the double bottom are improved and some of the thicker plates can be removed if the transverse reinforced pipe duct is used. Therefore, the overall steel weight for the Capesize bulk carrier using the transverse reinforced pipe duct was found to be less than that using the longitudinal reinforced pipe duct.

Finite element analysis of elastomer used in automotive suspension systems

2019 ◽  
Vol 52 (6) ◽  
pp. 521-536
Author(s):  
R Karthikeyan ◽  
S Rajkumar ◽  
R Joseph Bensingh ◽  
M Abdul Kader ◽  
Sanjay K Nayak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Uniaxial Stress ◽  
Leaf Spring ◽  
Loading Conditions ◽  
Element Analysis ◽  
Rubber Material ◽  
Hyperelastic Materials ◽  
Automotive Suspension

Present research endeavours towards the development of a methodology to enhance the life of hyperelastic materials in automotive suspension (leaf spring) system. The durability of the elastomeric (rubber) material in the insert was determined at various loading conditions for better operation. Three different rubber materials were used as the models including the currently used rubber material in the suspension system. The non-linear finite element analysis was carried out for the three different materials with the uniaxial stress–strain data as the input source for the material properties. A suitable hyperelastic model was also used as the input for determining the deformation and the stress concentration in the leaf spring tip insert. The failure of the tip insert was determined in various loading conditions and the best design for limited stress concentration with higher reliability was determined in the three models. The overall results are tabulated and compared for better utilization of rubber as a tip insert in the automotive industry.

Numerical Investigation of Stress Concentration Factor at Irregular Corrosion Pit Under Tension-Torsion Loading

2014 ◽  
Author(s):  
Yuhui Huang ◽  
Chengcheng Wang ◽  
Shan-Tung Tu ◽  
Fu-Zhen Xuan ◽  
Takamoto Itoh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Aspect Ratio ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Three Dimensional ◽  
Element Analysis ◽  
Stress Concentration Factors ◽  
Local Dissolution

Finite element analysis is adopted to study the stress concentration of pit area under tension-torsion loading. The stress concentration factors under regular evolution and irregular evolution of pits are investigated by conducting a series of three-dimensional semi-elliptical pitted models. Based on the finite element analysis, it can be concluded that pit aspect ratio (a/2c) is a significant parameter affecting stress concentration factor (SCF) for regular evolution pits. Pits, having higher aspect ratio, are very dangerous form and can cause significant reduction in the load carrying capacity. When local dissolution occurs in the pitting area, SCF will have a sharp increase, it is more probable for a crack to initiate from these areas compared with pits for regular evolution. Furthermore, local dissolution coefficient is proposed to study effect of local dissolution within the pit on SCF.

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