(1) In a filament-wound pressure vessel, the stress calculated from the pressure or load divided by the entire cross-sectional area of the wall (not just that of the reinforcement). (2) In a fluid flowing through a channel (such as a die, tube, or extruder-screw channel), the shear stress at any channel surface. In the simplest case of a fluid in steady flow through a circular tube of radius R and length L, the wall stress is given by ΔP·R/2L, where ΔP is the pressure drop from inlet to outlet. (Munson BR, Young DF, Okiishi TH (2005) Fundamentals of Fluid Mechanics. John Wiley and Sons, New York)
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Gooch, J.W. (2011). Wall Stress. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_12664
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