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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.
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.
Bending Strength
แปลว่า(english) Upper limit of normal stress of a beam at which fracture or excessive plastic deformation occurs.
normal stress
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