In environments with wide temperature range, thermal stress due to the difference in the coefficient of linear expansion
between the chip resistor and the mounting board is repeatedly applied, causing cracks in the solder fillets, eventually resulting in a variation in resistance.
The following thermophysical properties of CM were investigated for determining the optimal ratio between the concentration of polyester resin (PR) and epoxy oligomer in the binder: the Martens thermal resistance temperature, the thermal coefficient of linear expansion
, the glass transition temperature, and the shrinkage.
While the track breaks due to coefficient of linear expansion
in summer, the same happens in winter due to contraction.
7) Average coefficient of linear expansion
[beta] = 1.15 x [10.sup.-5] 1/K;
The coefficient of linear expansion
a is the relative extension of a coupon at the temperature increase by 1[degrees]C.
It is good at damping out vibrations, and its along-grain temperature coefficient of linear expansion
* Millennium V is based on a PC/ABS alloy with an exceptionally low coefficient of linear expansion
and outstanding dimensional stability in large, precisely fitting panels for transportation, recreational, and building applications.
The EMC 2600 has a lower coefficient of linear expansion
at 150 Fahrenheit degrees (83 Celsius degrees) above its [T.sub.g] than the polyetherimide has in its normal operating range.
where [alpha][.sub.1] is the coefficient of linear expansion
, and L[.sub.1] and L[.sub.2] are the lengths of the specimen at temperatures (or time) T[.sub.1] and T[.sub.2], respectively.
To obtain values for the volumetric thermal expansion coefficients, [[Beta].sub.m] and [[Beta].sub.p], thermomechanical analysis (TMA) of a sample that had previously been cured in the dilatometer was conducted to obtain the coefficient of linear expansion
for the cured polymer.
Processable with conventional RIM equipment, Bayflex 190 also promises low moisture absorption, low coefficient of linear expansion
, superior toughness, excellent self-release from the mold, and ease in painting.