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The objective of this video is to give an introductory overview on hoop stress- a normal stress on tangential direction. First part of the video asks to consider an open pipe with radius R & thickness t and subsequently illustrates the free body diagram clearing the fact that a pipe open at its end only experiences hoop stresses. Next, the video briefly talks about the assumptions made to describe the theory of hoop stresses. Hoop stresses essentially are caused by pressure acting equally outwards.
This result in tension around the pipe circumference that will make it expands outwards across its radius. Moving on, the video talks about the notation used for hoop stress & talks about the fact that in a thin pipe it can be assumed the hoop stresses are constant throughout the thickness. Later, the video illustrates a free body diagram of half a pipe filled up with a fluid subjected to hoop stresses & subsequently derives the equation of hoop stress considering vertical force equilibrium.
