Underfill Encapsulant dialog - Filler Properties

This dialog is used to view/edit the properties of the selected underfill encapsulant material.

The Filler Properties tab of this dialog is used to specify the physical properties of any filler material(s) added to the underfill encapsulant material.

To access this dialog to view the properties of the currently selected encapsulant, right-click the Material Selection task in the Study Tasks pane and select Details.

To access this dialog to edit the properties of the currently selected material, double-click the Process Settings task in the Study Tasks pane, click Advanced options, then click the Edit button associated with the Underfill encapsulant option.

The collection of property values defined on the dialog are saved to a property set with the description shown in the Name box.

Dialog elements

Filler data	Filler data consists of the description and weight of each filler included in the selected material. Multiple fillers can be selected in a composite material, and all fillers are taken into account in the subsequent analysis. Note: To define default inputs for all analyses, click (Tools tab > Databases panel > Edit) and select the database you want to edit.
Density (rho)	Specifies the density of the filler (composite) material in g/cm3.
Specific heat (Cp)	The amount of heat required to raise the temperature of a unit mass of the material by one degree Centigrade. The specific heat (Cp) of a material is essentially a measure of a material's ability to convert heat input to a rise in temperature. It is measured at zero pressure and either a range of temperatures, or an average across the temperature range of 50°C to the material's maximum processing temperature.
Thermal conductivity (k)	The rate of heat transfer by conduction, per unit length per degrees Celsius. The thermal conductivity (k) of a material is essentially a measure of the rate at which a material can dissipate heat. It is measured under pressure and at either a range of temperatures, or an average across the material's melt temperature range. The unit of measure is W/m-C, Watts per meter Celsius.
Mechanical properties data	Five independent mechanical constants required to characterize a transversely isotropic elastic material. These inputs are used to specify the mechanical properties of the matrix (that is, of the base material without fibers or fillers) and include: Elastic modulus, 1st principle direction (E1). Elastic modulus, 2nd principle direction (E2). Poisson's ratio (v12). Poisson's ratio (v23). Shear modulus (G12).
Coefficient of thermal expansion (CTE) data	These inputs are used to specify the thermal expansion properties of the filler (fibers/filler). These CTE coefficients combine with the Mechanical Data model to account for variation in properties in the flow direction and transverse to the direction of flow. Following are the Transversely Isotropic CTE coefficients: Alpha 1 The thermal expansion coefficient in the flow direction. Alpha 2 The thermal expansion coefficient in the transverse direction.
Tensile strength data	The boxes in this area display the data for filler materials. The options are: Parallel to major axis of fiber/filler The tensile strength of a fiber or filler along its axis. Perpendicular to major axis of fiber/filler The tensile strength of a fiber or filler perpendicular to its axis.
Aspect ratio (L/D)	The ratio to major or minor axis or, alternatively, the effective length to diameter of the inclusion. The range of aspect ratio for various types of reinforcements is summarized below: Aspect Ratio Reinforcement Type 0< AR < 1 Oblate or disk-like shapes (eg, mica, flakes) AR > 1 Prolate or cylindrical shape (eg, fiber) AR = 1 Spherical or cubic shaped fillers
Filler length information	Specifies the initial length and measurement details of the filler material. The parameters are: Initial Length The length of the fillers or fibers before the molding process begins. Note: Fibers having an initial length longer than 1 mm are generally considered as long fibers. Measurement method The method used to measure the initial length of the fillers or fibers. Options include: Not specified. This is the default setting used when no filler length value is supplied. Optical Reflectometer Digitizing Other method Supplemental. This setting indicates that the filler data has been supplemented with a reasonable initial length value, which is not the result of material-specific measurement. Year measured The year in which the filler length was measured.