如何计算Shear Stress
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Shear stress is stress from forces parallel to a surface, causing internal sliding. It's critical for joint design and fastener selection.
公式
Calculate: τ = V/A where V is shear force and A is area
- V
- V value — Variable used in the calculation
- A
- A value — Variable used in the calculation
分步指南
- 1Calculate: τ = V/A where V is shear force and A is area
- 2For beams: τ = 1.5V/A (rectangular cross-section)
- 3Results show stress intensity and safety margins
例题解析
输入
V = 50 kN, A = 0.01 m² (100×100 mm)
结果
τ = 5 MPa (low for steel)
Safe for typical steel
常见错误注意事项
- ✕Using average stress instead of accounting for concentration
- ✕Neglecting shear in fastener design
常见问题
How is shear stress different from normal stress?
Normal stress acts perpendicular to surface, shear acts parallel. Materials handle shear differently.
Where is shear stress highest in a beam?
Maximum shear occurs at the supports; minimum (zero) at points of zero shear force.
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