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Stress:

แปลว่า(english) The intensity of internal force acting at a point in an object. Stress is measured in units of force per area. See shear stress and normal stress.

Yield stress:

แปลว่า(english) A material loaded beyond its yield stress, no longer exhibits linear elastic behavior. Metals, particularly mild steel, generally have a very well defined yield stress compared to other materials. Yield stress is sometimes called yield strength.

Shear stress:

แปลว่า(english) Stress acting parallel to an imaginary plane cut through an object.

Normal stress:

แปลว่า(english) Stress acting perpendicular to an imaginary plane cutting through an object. Normal stress has two senses: compression and tension. Normal stress is often simply called stress.