Effect of Extreme Temperatures on the Coefficient of Thermal
coefficient of thermal expansion (CTE) is assumed to be constant for temperatures between 32 and 140°F (0 to 60°C) However, recent field analysis of an adjacent box-girder bridge with HSC girders connected using UHPC shear keys has shown that the actual temperature range experience by the UHPC-HSC was 14 to 100 4°F (-10 to 38°C)
COEFFICIENT OF THERMAL EXPANSION FOR VARIOUS MATERIALS AT
The coefficient of thermal expansion is defined as the change in length or volume of a material for a unit change in temperature The overall coefficient is the linear thermal expansion (in ) per degree Fahrenheit or Celsius The CTE data is calculated by the change in length divided by the quantity of
Reversible Temperature Coefficients
• Reversible Temperature Coefficient of Coercivity – Is a measure for the average of the change in Hci as a function of temperature – Is often referred to as (Greek letter beta) – The IEC proposes naming it “ (HcJ)” • Expressed as change per ºC (or K or ºF) • These are average values over a specified temperature range
Temperature Coefficient of Resistance for Current Sensing
The temperature coefficient of resistance (TCR), sometimes referred to as resistance temperature coefficient (RTC), is a characteristic of the thermal energy component of the above imperfections The effect of this resistance change is reversible as the temperature returns to reference temperature, assuming the grain structure was not altered
Temperature coefficient of resistivity
Temperature coefficient of resistivity Example: A platinum resistance thermometer has a resistance R 0 = 50 0 Ω at T 0=20 ºC α for Pt is 3 92×10-3 (ºC)-1 The thermometer is immersed in a vessel
Iterative calculation of the heat transfer coefficient
The heat transfer coefficient, h, is the most difficult parameter to be settled In this report it is shown a fast and easy iterative method to calculate the h value and later, the temperature of cooling for heat sink Introduction The heat transfer coefficient or convective coefficient (h), is used in thermodynamics to calculate the heat
Thermal expansion of technical solids at low temperatures; a
Table2 1 Linearthermalcontractionandcoefficientsoflinearthermalexpansion Elements Aluminuin Antimonyt Berylliumt Bismuth Cadmiumb T 10« dLjg ,£293-iT 106 dijg,£293
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COEFFICIENT OF THERMAL EXPANSION
FOR VARIOUS MATERIALS
AT DIFFERENT TEMPERATURES
Technical Report
TR-18 (Rev. F)
19650Pauling
Foothill Ranch
, CA 92610-2610 Tel (949) 460-2100 Fax (949) 460-2300Email: sales@balseal.com
www.balseal.comSpinozastraat 1
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The Netherlands
Tel +31 20 638 6523
Fax +31 20 625 6018
Email: info@balseal.nl
www.balseal.nlTR-18 (100-72-1)
Rev.F / 6/25/2004
Page 2 of 2
CONTENTS
1.0 Purpose
2.0 Scope
3.0 Definitions
4.0 Charts
5.0 Reference
It is essential that the customer run evaluation testing under actual service conditions with a sufficient safety factor to determine if the
proposed, supplied, or purchased, Bal Seal Engineering products are suitable for the intended purpose and to confirm expected results. Bal
Seal Engineering makes no warranty, express or implied, regarding Bal Seal Engineering products or of the information contained herein,
including but not limited to, warranties of merchantability, performance, and fitness for a particular use or purpose. Bal Seal Engineering
shall not be liable for any loss or damage of any kind or nature that may result from the use of, reference to, or reliance on, the information
contained herein, including, but not limited to, consequential, special (including loss of profits) direct, indirect, incidental, or similar damages,
even if Bal Seal Engineering has been advised of the possibility of such damages .(LE-173-2.4 Rev.Ø) TR-18 rev A 6/25/2004 RR 100-71-2)This document contains information PROPRIETARY to Bal Seal Engineering and may not be used, reproduced, or disclosed to anyone
else, in whole or in part, without the prior written authorization of an officer of Bal Seal Engineering. © 2004 Bal Seal Engineering Co.
www.balseal.comTR-18 (100-71-2 )
Rev.F / 6/25/2004
Page 3 of 3
Coefficient of Thermal Expansion for Various Materials at Different Temp eratures1.0 Purpose
The purpose of this Technical Report is to show the coefficient of therm al expansion (CTE) for various metallic and non-metallic materials used in springs and seals made by Bal Seal Engineering Co.2.0 Scope
The coefficient of thermal expansion is used to determine the rate at which a material expands as afunction of temperature. CTE is used for design purposes to determine if failure by thermal stress may
occur. Understanding the relative expansion/contraction characteristics of materials is important for application success. The CTE values are of considerable interest to design engineers. Plastic s tend to expand and contract anywhere from six to nine times more than metals. The thermal expansion difference develops internal stresses and stress concentrations in the polymer, which allows premature failure to occur.3.0 Definition
The coefficient of thermal expansion is defined as the change in length or volume of a material for a
unit change in temperature. The overall coefficient is the linear thermal expansion (in.) per degree Fahrenheit or Celsius. The CTE data is calculated by the change in lengt h divided by the quantity of the length at room temperature, multiplied by the change of temperature.This document contains information PROPRIETARY to Bal Seal Engineering and may not be used, reproduced, or disclosed to anyone
else, in whole or in part, without the prior written authorization of an officer of Bal Seal Engineering. © 2004 Bal Seal Engineering Co.
www.balseal.com