Fracture resulting from the presence of temperature gradients that vary with time in such a manner as to produce cyclic stresses in a structure.

The maximum and/or minimum temperature at which a material will perform its function without undue degradation.

See Reservoir, Thermal.

See Resistance, Thermal.

1) The creation of a steep temperature gradient and accompanying high stress within a structure. 2) A test to determine the ability of a material to withstand heat and cold by subjecting it to rapid and wide changes in temperature. Note: a rapid temperature increase of the material can usually be avoided by proper warm-up prior to annealing. 3) A term used in metal working coolant/oil make-up procedures where cold make-up liquid would drastically alter the temperature of the coolant/oil and temporarily change the operating conditions until the body of the fluid’s temperature returns to its normal operating level.

Stress in metal, resulting from nonuniform distribution of temperature.

Crazing and cracking of some thermoplastic resins that result from overexposure to elevated temperatures.

The procedure for treating metals for homogenization, re-heating for rolling, annealing, solution heat treatment and precipitation treatments. Each thermal treatment serves a specific purpose and does not necessarily apply to every alloy.

The liberation of electrons or ions from a solid or liquid as a result of its thermal energy.

An electronic device that makes use of the change of resistivity of a semiconductor with change in temperature.

A device for measuring temperature, consisting of lengths of two dissimilar metals or alloys that are electrically joined at one end and connected to a voltage-measuring instrument at the other end. When one junction is hotter than the other, a thermal electromotive force is produced that is roughly proportional to the difference in temperature between the hot and cold junctions.

A thermocouple designed to be used as part of an assembly, but without associated parts such as the terminal block, connecting head or protecting tube.

Same as Thermocouple Lead Wire.

A cable comprised of one or more twisted thermocouple extension wires under a common sheath.

An insulated pair of wires used from the thermocouple to the junction box or to the recording instrument.

A two-conductor cable with each conductor employing a dissimilar metal, made up specifically for use in thermocouples.

Such a thermocouple is made of fabric- or plastic-covered wire. The wire is provided in coils or on spools. Insulation usually consists of glass braid, asbestos or ceramic fiber cloth on each conductor plus glass braid overall.

Those thermocouples that are not covered with fabric or plastic insulation. One type consists of ceramic insulators over bare thermocouple wire, sometimes inserted in a tube for stability and protection. A second type consists of a combination of thermocouple wires, mineral insulation and a protecting metal sheath compacted into a small diameter.

A device that converts thermal energy to electricity by direct interaction of a heat flow with the charge carriers in an electric circuit. For this process, it requires a temperature difference in the electric circuit.

A device that transfers thermal energy from one body to another by the direct interaction of an electrical current and the heat flow.