1.

• SHEAR TEST

Normal stress(tensile and compressive) acts in a directionperpendicularto 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.

2.

Shear stressacts in a directionparallelto 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.

3. T T Tension -pulling apart V V Shear -sliding past 4. Example: Shearing Posts 5. 6. 7. 8.

Example:Nail through boards

Shear Plane V/5 V/5 V V Shear Plane 9.

v =V

A v= shear stress (psi) V = shear force (lb) A= cross-sectional areaparallel to the force. 10.

Example: Find the shear stress in the 1 diameter bolt shown.

1 diameter bolt 4,000 lbSteel Plates 4,000 lb Shear Plane 11.

v =V

A

V = 4,000 lb

A = d 2=(1) 2= .785 in 2

4 4

v=4,000 lb= 5,096 psi

.785 in 2