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4. Shear Test

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4. Shear Test

1. 1. <ul><li>SHEAR TEST </li></ul><ul><li> Normal stress (tensile and compressive) acts in a direction perpendicular to the surface on which it acts. It is produced by a force whose line of action is perpendicular to the surface on which the stress is produced. </li></ul>
2. 2. <ul><li>Shear stress acts in a direction parallel to the surface on which it acts. It is produced by a force whose line of action is parallel to the surface on which the stress is produced. </li></ul>
3. 3. T T Tension -pulling apart V V Shear -sliding past
4. 4. Example: Shearing Posts
5. 8. <ul><li>Example: Nail through boards </li></ul>Shear Plane V/5 V/5 V V Shear Plane
6. 9. <ul><li> v = V </li></ul>A  v = shear stress (psi) V = shear force (lb) A= cross-sectional area parallel to the force.
7. 10. <ul><li>Example: Find the shear stress in the 1” diameter bolt shown. </li></ul>1” diameter bolt 4,000 lb Steel Plates 4,000 lb Shear Plane
8. 11. <ul><li> v = V </li></ul><ul><li>A </li></ul><ul><li>V = 4,000 lb </li></ul><ul><li>A =  d 2 =  (1”) 2 = .785 in 2 </li></ul><ul><li>4 4 </li></ul><ul><li>  v = 4,000 lb = 5,096 psi </li></ul><ul><li>.785 in 2 </li></ul>