| 词条 | Shear force |
| 释义 |
Shear force of steel and boltsHere follows a short example of how to work out the shear force of a piece of steel. The factor of 0.6 used to change from tensile to shear force could vary from 0.58–0.62 and will depend on application. Steel called EN8 bright has a tensile strength of 800{{nbsp}}MPa and mild steel has a tensile strength of 400{{nbsp}}MPa. To work out the force to shear a 25 mm diameter round steel EN8 bright; Area of the 25{{nbsp}}mm round steel in mm2 = (12.52)(π) ≈ 490.8{{nbsp}}mm2 0.8{{nbsp}}kN/mm2 × 490.8{{nbsp}}mm2 = 392.64{{nbsp}}kN ≈ 40{{nbsp}}tonne-force 40{{nbsp}}tonne-force × 0.6 (to change force from tensile to shear) = 24{{nbsp}}tonne-force When working with a riveted or tensioned bolted joint, the strength comes from friction between the materials bolted together. Bolts are correctly torqued to maintain the friction. The shear force only becomes relevant when the bolts are not torqued. A bolt with property class 12.9 has a tensile strength of 1200{{nbsp}}MPa (1{{nbsp}}MPa = 1{{nbsp}}N/mm2) or 1.2{{nbsp}}kN/mm2 and the yield strength is 0.90 times tensile strength, 1080{{nbsp}}MPa in this case. A bolt with property class 4.6 has a tensile strength of 400{{nbsp}}MPa (1{{nbsp}}MPa = 1{{nbsp}}N/mm2) or 0.4 kN/mm2 and yield strength is 0.60 times tensile strength, 240{{nbsp}}MPa in this case. In case of fasteners, proof load is specified as it gives a real-life picture about the characteristics of the bolt. See also
References1. ^{{cite book|author=William A. Nash|title=Schaum's Outline of Theory and Problems of Strength of Materials|pages=82|url=https://books.google.com/books?id=vwdApH7qneAC&pg=PR4|accessdate=20 May 2012|date=1 July 1998|publisher=McGraw-Hill Professional|isbn=978-0-07-046617-3}} 2 : Force|Civil engineering |
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