- #1
unscientific
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First, I pondered about the concepts of force and pressure, force can't exist without pressure, vice versa. Imagine a an adhesive sandwiched between a tabletop and a silicon wafer. (this is part 1)
Now, when you exert a shearing force Fshear above the adhesive and between the silicon thickness, the adhesive-silicon force exerts an adhesive force opposite in direction to the shearing force. Simultaneously, the adhesive-table force exerts an adhesive force opposite in direction to the shearing force.
This is shown as in diagram 1.
At the point of cohesive failure,
Fshear = F'si + F'table
If F'si > F'table,
the point of rupture would be the table-adhesive contact
If F'table > F'si,
the point of rupture would be the silicon-adhesive contact.
Now, I know that F'table is less than Ftable, where Ftable is the TRUE or MAXIMUM adhesive contact force between the adhesive and table.
Furthermore, I know that F'si is less than Fsi, where Fsi is the TRUE of MAXIMUM adhesive contact force between the adhesive and silicon.
Now, when you exert a shearing force Fshear above the adhesive and between the silicon thickness, the adhesive-silicon force exerts an adhesive force opposite in direction to the shearing force. Simultaneously, the adhesive-table force exerts an adhesive force opposite in direction to the shearing force.
This is shown as in diagram 1.
At the point of cohesive failure,
Fshear = F'si + F'table
If F'si > F'table,
the point of rupture would be the table-adhesive contact
If F'table > F'si,
the point of rupture would be the silicon-adhesive contact.
Now, I know that F'table is less than Ftable, where Ftable is the TRUE or MAXIMUM adhesive contact force between the adhesive and table.
Furthermore, I know that F'si is less than Fsi, where Fsi is the TRUE of MAXIMUM adhesive contact force between the adhesive and silicon.