Catalogues and Specifications Reference Manual
Properties Constructor : Material Property Data : Material Properties
Material Properties
The pipework material properties associated with flexibility and stress analysis are as follows:
POISSON’S RATIO
COEFFICIENT OF EXPANSION
YOUNG’S MODULUS
ALLOWABLE STRESS
DENSITY
There can also be three general properties known as A, B and C properties. These are used to store any additional properties that may be needed. Each of these may be a function of temperature and/or pressure.
To enable the properties to be stored against temperature and pressure values, the data is stored in a tabular format which incorporates a ‘table’ element for each type of property: TYOU (table of Young’s modulus values), TSTR (table of allowable stresses), etc.
Below these are ‘spot’ elements, SYOU, SSTR etc. The ‘spot’ elements have attributes PRES and TEMP where values of pressure and temperature may be input. Each element also has an attribute to allow the input of the corresponding value of its own property; for example, SYOU has an attribute YOUN where a value of Young’s modulus may be stored, SAPR has an attribute APRO where a value of APROPERTY may be stored, and so on.
At different temperatures and pressures, the value of Young’s modulus may vary, and so more spot Young’s modulus elements (SYOUs) may be created with different temperature, pressure and Young’s modulus values. Thus the attributes settings for a specific SYOU might be:
TYPE   SYOU
(Spot Young’s modulus)
 
NAME
 
LOCK
 
OWNE
 
TEMP   20
(Temperature)
PRES   101EX+3
(Pressure)
YOUN   210EX+9
(Young’s modulus value; see Exponential Numbers for a description of the exponential format of numbers)
The table that these spot properties create can then be used by a suitable stressing package. The table effectively forms a graph with the spot property, temperature and pressure. From this table, therefore, the stressing package can interpolate other values it may need.
The AVEVA E3D™ unit for TEMP is degrees centigrade and for PRES and YOUN is N/m². Therefore, this material at a temperature of 20 degrees centigrade and a pressure of 101 kN/m² would have a value for Young’s modulus (E) of 210 GN/m². For a change of units, see Use of Groups.
Note:
FLUI does not have the elements relating to allowable stress, nor Poisson's ratio, i.e. TSTR, TPOI, SSTR and SPOI.
The elements SOLI and FLUI have an attribute DESC (Description) which is a 120-character text string.
The table elements (TPOI, TEXPANSION etc) have an attribute PQUA (Property Qualifier) which is some qualification under which the property applies. There is provision for 4 characters.
The table elements also have an attribute SREF (Source Reference). This may be the name of a book from where the spot values were obtained and is a 12-character text string.
The elements TAPR, TBPR and TCPR also have an attribute PNAM (Property Name) which is a 12-character text string.
At the same level as the table elements is an element TEXT which has an attribute STEX which is a 50-character text string.
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