scholarly journals Thick-film Load-sensing bridges – Effect of Temperature and Mechanical Boundary Conditions

2014 ◽  
Vol 87 ◽  
pp. 180-183 ◽  
Author(s):  
Thomas Maeder ◽  
Caroline Jacq ◽  
Peter Ryser
Keyword(s):  
Boundary Conditions ◽  
Thick Film ◽  
Effect Of Temperature ◽  
Load Sensing

scholarly journals Buckling and vibration analysis of shape memory laminated composite beams under axially heterogeneous in-plane loads in the glass transition temperature region

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Nilesh Tiwari ◽  
A. A. Shaikh
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Boundary Conditions ◽  
Shape Memory ◽  
Transition Region ◽  
Shape Memory Polymer ◽  
Shear Deformation Theory ◽  
Effect Of Temperature ◽  
Glass Transition Region

AbstractBuckling and vibration study of the shape memory polymer composites (SMPC) across the glass transition temperature under heterogeneous loading conditions are presented. Finite element analysis based on C° continuity equation through the higher order shear deformation theory (HSDT) is employed considering non linear Von Karman approach to estimate critical buckling and vibration for the temperature span from 273 to 373 K. Extensive numerical investigations are presented to understand the effect of temperature, boundary conditions, aspect ratio, fiber orientations, laminate stacking and modes of phenomenon on the buckling and vibration behavior of SMPC beam along with the validation and convergence study. Effect of thermal conditions, particularly in the glass transition region of the shape memory polymer, is considerable and presents cohesive relation between dynamic modulus properties with magnitude of critical buckling and vibration. Moreover, it has also been inferred that type of axial loading condition along with the corresponding boundary conditions significantly affect the buckling and vibration load across the glass transition region.

scholarly journals The Effect of the Operating Conditions on the Apparent Viscosity of Crude Palm Oil During Oil Clarification

1970 ◽  
Vol 5 (1) ◽  
Author(s):  
Sulaiman Al-Zuhair, Mirghani I. Ahmed and Yousif A. Abakr
Keyword(s):  
Shear Rate ◽  
Boundary Conditions ◽  
Palm Oil ◽  
Apparent Viscosity ◽  
Operating Conditions ◽  
Effect Of Temperature ◽  
Optimum Operating ◽  
Crude Palm Oil ◽  
Different Boundary Conditions ◽  
Rotary Viscometer

This paper discusses the apparent viscosity of crude palm oil, using rotary viscometer, under different boundary conditions. It was experimentally shown that the apparent viscosity of palm oil drops with increasing of the shear rate and the temperature.  However, the effect of temperature on the viscosity tends to fade at temperatures beyond 80 oC.  A correlation between the apparent viscosity of crude palm oil and the operating conditions was developed. This correlation can be used in design of crude palm oil settlers and in determining the optimum operating conditions.Key Words:  Crude palm oil, apparent viscosity, shear rate, modelling, separation 

Effect of Temperature on Palladium-Doped Tin Oxide (SnO2) Thick Film Gas Sensor

2013 ◽  
Vol 5 (9) ◽  
pp. 932-936 ◽  
Author(s):  
Meenakshi Choudhary ◽  
V. N. Mishra ◽  
R. Dwivedi
Keyword(s):  
Thick Film ◽  
Gas Sensor ◽  
Tin Oxide ◽  
Effect Of Temperature

Experimental Study on the Effect of Temperature on Modal Frequencies of Bridges

2018 ◽  
Vol 18 (12) ◽  
pp. 1850155 ◽  
Author(s):  
Limin Sun ◽  
Yi Zhou ◽  
Zhihua Min
Keyword(s):  
Boundary Conditions ◽  
Freezing Point ◽  
Concrete Bridges ◽  
Effect Of Temperature ◽  
Steel Cable ◽  
Temperature Changes ◽  
Continuous Beam Bridge ◽  
Bridge Model ◽  
Increasing Temperature ◽  
Beam Bridge

This study investigates the relationship between the temperature and the modal frequencies of bridges through a series of model experiments using a concrete continuous beam bridge model and a steel cable-stayed bridge model in a controlled-temperature chamber. The experimental results show that, for a given boundary condition and in the absence of freezing, a change in temperature affects the structural frequencies of the bridge as it alters the elastic modulus of the bridge materials. The structural frequency tends to linearly decrease with increasing temperature and with the decrease in the frequency of steel bridges smaller than that of concrete bridges. For the particular case of wet concrete bridges, the temperature dependencies of modal frequencies vary dramatically near the freezing point, which is attributable to the freeze–thaw process of concrete pore water. The effect of air humidity on structural frequency is less significant than that of temperature when the boundary conditions remain unchanged. Furthermore, temperature changes may alter the boundary conditions of bridges, thereby affecting the structural frequencies.

Wetting Kinetics of Molten 60Sn40Pb on a Ag-0.33 wt.% Pt Thick Film Conductor

1995 ◽  
Vol 117 (3) ◽  
pp. 241-245 ◽  
Author(s):  
J. Campbell ◽  
H. Conrad
Keyword(s):  
Contact Angle ◽  
Thick Film ◽  
Sessile Drop ◽  
Stage Ii ◽  
Stage Iii ◽  
Effect Of Temperature ◽  
Solid Alloy ◽  
Spherical Cap ◽  
Time Exponent ◽  
Wetting Kinetics

The effects of time (10-6000 s) and temperature (194°-265°C) on the wetting of a Ag-0.33 wt percent Pt thick film (10 μm) conductor substrate by molten 60Sn40Pb were investigated using the sessile drop method. The wetting occurred in three stages. In Stage I the solid alloy piece melted and spread rapidly to form a spherical cap. The spreading slowed down appreciably in Stage II but increased again in Stage III, the time exponent in Stage III being of the order of 0.1–0.25, which was 2–3 times that in Stage II. In general, the contact angle θ and the time exponent decreased with temperature. The activation energy for the effect of temperature on the contact angle in Stages II and III and on the transition time tc between these stages was approximately 7 kcal/mole. This value was concluded to represent the diffusion of Sn atoms over the halo surface as a precursor to the formation of the intermetallic compound Ag3Sn at the molten solder/substrate interface.

Effect of Temperature Variation on Nickel Cadmium (Ni-Cd) and Nickel Metal Hydride (Ni-MH) Battery Parameters

2004 ◽  
Author(s):  
Majid Ghassemi ◽  
Ebrahim Afshari
Keyword(s):  
Boundary Conditions ◽  
Thermal Behavior ◽  
Metal Hydride ◽  
Energy Equation ◽  
Source Term ◽  
Effect Of Temperature ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Non Linear ◽  
Mh Battery

The ultra-fast charging capability, distinct properties, fine performance and high capacity of nickel cadmium (Ni-Cd) and nickel metal hydride (Ni-MH) batteries along with their limited weight and size are very attractive for use in many applications including cordless and portable devices, emergency and standby power, telecommunication equipments, photovoltaic systems, electric vehicle, satellite and space craft and power plant supporting equipments. However, the limitation on their temperature requires a detail thermal analysis of these batteries. Thermal behavior of batteries are effected by their boundary conditions, type and construction, and more importantly by their chemical reaction. The purpose of this study is to investigate the effect of temperature on thermal behavior of the Ni-Cd and Ni-MH batteries. The governing equation is the transient and non-linear differential energy equation subjected to non linear radiation boundary conditions and source term. To solve the transient and non-linear governing differential energy equation a control volume based finite difference code is utilized. In formulation of the governing differential energy equation, the Ni-Cd and Ni-MH properties (K, C, ρ) are not constant and the chemical characteristic of the Ni-Cd and Ni-MH batteries, source term, vary with location and time. Calculated thermal characteristic of each battery is then compared to experimental results. The result shows that Ni-MH battery is thermally more suitable for space application and satellite.

Quantify Temperature Effects on Crack Size Studies in Metallic Structures Using Vibration-Based Health Monitoring

2010 ◽  
Author(s):  
Mana Afshari ◽  
Brad A. Butrym ◽  
Daniel J. Inman
Keyword(s):  
Fatigue Crack ◽  
Boundary Conditions ◽  
Frequency Response ◽  
Temperature Variation ◽  
Analytical Model ◽  
Modulus Of Elasticity ◽  
Crack Size ◽  
Equation Of Motion ◽  
Effect Of Temperature ◽  
Bottom Surface

This paper examines the vibration-based monitoring technique to quantify the smallest crack size that is detectable in Aluminum beams using piezoceramic excitation and sensing. Having the analytical model of the effect of crack formation on the frequency response of the system, the effect of temperature is also taken into consideration to have a better understanding of the damage effect. The analytical model used in the present work is based on the recent model introduced by Aydin (2008) which is a simplified version of the model used by Khiem et. al. (2001). The beam studied here is assumed to be a uniform Euler-Bernoulli beam having a single fatigue crack and being axially loaded. The crack is treated as a localized reduction in the stiffness and is modeled as a massless rotational spring at the location of the crack, connecting the bisections of the beam. The beam is assumed to be simply supported and subject to a uniform heat flux along the top surface of the beam. For the simplicity in the modeling, it is assumed that the bottom surface of the beam is insulated. The crack is also assumed to be non-breathing during the deformation of the beam. The change in the temperature will alter the modulus of elasticity of the beam and will also cause thermal moments inside the beam which will add terms in both the equation of motion and the boundary conditions of the vibrating beam. First, the effect of temperature on the modulus of elasticity of the beam is studied analytically for different boundary conditions of the beam ends. These modeling results are then compared to the experimental ones. Second, the effect of temperature variation is analytically modeled into the equation of motion of the beam and the boundary conditions. Having the equation of motion of the vibrating beam, the effect of temperature on the frequency response of the beam having a single fatigue crack is studied. Taking into account the effect of temperature on the resonance frequency of the beam will be essential in distinguishing the two effects of damage presence and temperature variation and will be important in quantifying the smallest detectable crack in a structure.

Sign in / Sign up

Export Citation Format

Share Document