Introduction to Common Bond Strength Calculation Formulas and Representation Methods

The formula and representation of bond strength can vary according to different applications and test methods, and here are several common formulas and representations for bond strength.

Tensile bond strength

Tensile bond strength is usually expressed as the tensile force per unit area and can be calculated using the following formula:$$\text{tensile bond strength} = \frac{\text{maximum tensile force}}{\text{contact area}}$$

Tensile bond strength = maximum tensile force in contact area.

Representation: Usually in megapascal (MPa) or Newtons per square millimeter (N/mm²).

Shear bond strength

The shear bond strength is expressed as the force on the shear surface and is calculated as follows:$$\text{Shear bond strength}=\frac{\text{Maximum shear force}}{\text{Contact area}}$$

Shear bond strength = maximum shear force in the contact area

Representation: Measured in megapascals (MPa) or Newtons per square millimeter (N/mm²).

Crimp bond strength

Crimp bond strength is expressed as pressure per unit length (e.g., centimeters or millimeters) and is calculated as follows:$$\text{crimp bond strength} = \frac{\text{maximum pressure}}{\text{contact length}}$$

Crimp bond strength = maximum pressure of contact length

Expression: Measured in megapascals per centimeter (MPa/cm) or Newtons per millimeter (N/mm).

Peel bond strength

Peel bond strength is expressed as the peel force per unit length (e.g., centimeters or millimeters) and is calculated as follows:$$\text{peel bond strength} = \frac{\text{maximum peel force}}{\text{contact length}}$$

Peel Bond Strength = Maximum Peel Force of Contact Length

Expression: Measured in megapascals per centimeter (MPa/cm) or Newtons per millimeter (N/mm).

summary

These formulas and representations can be adapted and adapted to specific experimental conditions and the specifications of the test equipment. In practice, bond strength is usually measured taking into account factors such as the contact area or length, the type of stress (tensile, shear, crimping, etc.), the nature of the material (hardness, elasticity, etc.).