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METALPAK, CPPAK & EXPAK Specifications...

METALPAK version 1.10 ( copyright Vincent Arp) is a DOS (32 bit) executable and serves as a basic reference computer program for the thermal properties of metals. CPPAK and EXPAK ( copyright Cryodata Inc.) are related to METALPAK and calculate specific heats and thermal expansivities, respectively, of a number of materials.  Both CPPAK and EXPAK are also DOS (32 bit) executables.  All three programs have been tested on the current Windows 8 (64 bit) OS and found to function as they have on earlier Windows operating systems.

 

METALPAK version 1.10

Is founded primarily upon extensive data collected and summarized by the National Institute of Standards and Technology (NIST), with some additional reference data from the Thermophysical Properties Research Center at Purdue University and the National Physical Laboratory in the UK.

METALPAK includes properties of 14 metals:

Aluminum

Chromium

Copper

Gold

Iron

Nickel

Niobium

Palladium

Platinum

Platinum

Silver

Tantalium

Titanium

Tungsten

Fundamental properties calculated by METALPAK are

Specific Heat

Thermal Expansivity

Electrical Resistivity

Thermal Conductivity

For convenient use in engineering applications, derived properties are also calculated:

Thermal Diffusivity

Enthalpy

Integrated length change

Thermal Conductivity integral

The temperature range for all metal properties is 1 to 300 K. Only normal state properties are calculated for superconductors. Mechanical properties are not included.

Theoretical basis

The electrical resistivity and thermal conductivity in any elemental metal at low temperature are primarily determined by impurities and/or lattice dislocations.

METALPAK uses the method pioneered at NIST for characterizing the impurity/dislocation content of any given sample by a single electrical measurement of "RRR" (the residual resistivity ratio). Such sample characterization will not be accurate for all metallurgical preparation processes, especially those which introduce a unique orientation in the grain structure, but it may be a reasonable first approximation. Cryodata extended the NIST work by developing METALPAK equations which accurately reproduce the available reference data as a function of RRR. The equations are then used to predict properties for an arbitrary RRR supplied by the user. For those metals where reference property data are scarce, the equations are scaled to yield credible properties estimates.

A technical paper describing the basis equations is available to those who may be interested.

For aluminum, copper, and silver, METALPAK also calculates magnetoresistance and related field-dependent properties from NIST data.

METALPAK will likely be an important addition to your library of low temperature standard reference data and Cryodata is not aware of comparable reference program is available from NIST or other sources.

 

CPPAK 1.20 and EXPAK 1.20

Related to METALPAK are the CPPAK and EXPAK programs which calculate specific heats and thermal expansivities, respectively, of a number of materials. For elemental metals, these properties are also available in METALPAK, with improved accuracy in some cases.

However, CPPAK includes specific heats which are not in METALPAK for:

Beryllium

Bismuth

Cadmium

Constantan

Diamond

Germanium

Glass

Graphite

Ice

Magnesium

Mercury

Molybdenum

Monel

Pyrex

Quartz

Rhodium

Rubber

Silicon

Sodium

Teflon

Zinc

 

EXPAK includes expansivity data which are not in METALPAK for:

11 ferrous alloys

2 cobalt alloys

2 nickel alloys

4 aluminum alloys

Be-copper

Beryllium

Brass

Germanium

Ice

Indium Antimonide

Silicon

Teflon

Zinc

 

 
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