Tuesday, October 18, 2011
Types of Stress
What is stress?
Stress is a force applied to a bond, usually expressed in N/mm2 (Newton’s per square millimetre) or MPa (Mega Pascals).
The following types of stress are commonly found in adhesive bonds:
1. Impact Stress – this occurs when a sudden force or shock is applied to a joint.
2. Tensile Stress – tensile stress tends to pull an object apart. It also tends to elongate an object.
3. Compressive Stress – The opposite of tensile stress, compressive stress tends to squeeze an object together.
4. Shear Stress – this stress is created by two surfaces sliding over one another.
5. Cleavage Stress – occurs when a joint is being opened at one end
6. Peel Stress – peel stress occurs when a flexible substrate is being lifted or peeled from the other substrate.
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