Tasks I Activities tTask1: 1. Two steel plates are riveted together by means of a Lap joint. Four rivets of diameter 9mm are used and the load carried is 20KN. What is the shear stress in the rivet material and the factor of safety in operation if the shear strength is 300MPa? 2. A double strap butt joint is shown below. The rivets are 10mm in diameter are in double shear. If the load of 15KN is applied and the rivet material has a shear strength of 200MPa ?nd the shear stress experienced by each rivet. Criteria covered by this task: P7: Calculate the maximum shear stress for a single shear lap joint and a double shear butt joint 'A— "in was lnnrlinn

1) Shear stress = 78.6 MPa

    Factor of safety = 3.82

2) Shear stress = 23.9 MPa

Step-by-step explanation

ll Diameter of rivet, 2: Number of rivets, Axial load, P Shear strength of rivet material, CALCULATIONS Area of rivet, A Load acting on each rivet, P' Each rivet is in single shear and hence, shear stress in each rivet, 1r Fcator of safety, F.S 2) Diameter of rivet, d Number of rivets, n Axial load, F Shear strength of rivet material, CALCULATIONS Area of rivet, A Load acting on each rivet, F' Each rivet is in double shear and hence, shear stress in each rivet, 1' 9mm 20 kN 300 Mpa 5 x 1000 N / 63.62 mm 2 78.6 N/mm2 78.6 Mpa [Note: 1 Mpa = 1 N/mmz] shear strength / shear stress 300 I 78.6 10 mm 15 kN 200 Mpa {F72} /A 1.875 x 1000 N I 78.54 mm 2 23.9 N/mmz [Note: 1 Mpa = 1 N/mmz]