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  "limitations": [
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    "Q = (2/3)(R³−r³)",
    "Width at the axis is 2(R−r)",
    "Not beam deflection"
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  "boundary_conditions": [
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      "title": "Hibbeler, Mechanics of Materials",
      "section": "Shear stress in a circular tube",
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        "r": 1
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        "I": 11.780972450961723,
        "b": 2,
        "area": 9.42477796076938,
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        "R": 2
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