Material Value

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Material value

Terminology

Material values (also characteristic values) represent the quantitative relationship between the material properties and the stress conditions for a particular material. A material value thus represents a numerical value with the associated physical unit of the property (see material parameter). The technical literature, especially Blumenauer [1—3], has pointed out a clear separation of the terms material value and material parameter, which has also been used in this Wiki-lexicon „Polymer Testing & Diagnostics“.

Examples

Examples are:

• Modulus of elasticity	Et	=	1250 MPa
• Tensile strength	σM	=	35 MPa
• Fracture toughness	KIC	=	100 MPa mm1/2 (see: fracture mechanics)

Factors influencing the property profile and thus the characteristic value level of plastics are:

Structural parameters

• Chain chemistry of the polymer
• Morphology
• Orientation
• Residual stress
• Additives (see: plastics)

Geometry parameters

• Shape, dimensions
• Notches
• Joint line (binding line)
• Inhomogeneities (micropore, vacuole and hole formation plastics)

Stress parameters

• Stress type (strain rates applications, fatigue and stress corrosion cracking)
• Stress duration (creep behavior in creep tensile test and Rockwell hardness)
• Stress frequency
• Stress rate
• Temperature
• Ambient media, environment

Material properties can only be determined in a reproducible manner if they are based on comparable chemical and physical structures, the same geometric conditions and the same test method or the same test conditions.

References

[1]	Blumenauer, H.: Werkstoffprüfung. Deutscher Verlag für Grundstoffindustrie Leipzig, 2nd edition (1978) ISBN:VLN 152-915/46/79 (see AMK-Library under M 1)
[2]	Blumenauer, H.: Werkstoffprüfung. Deutscher Verlag für Grundstoffindustrie Leipzig, 4th edition (1984), ISBN VLN 152-915/104/87 see AMK-Library under M 2)
[3]	Blumenauer, H.: Werkstoffprüfung. Deutscher Verlag für Grundstoffindustrie Leipzig Stuttgart, 6th edition (1994); ISBN 978-3-342-00547-6 (see AMK-Library under M 3).