Sample 1.
Two large tugboats at A=37° apart tried to dislodge a grounded cargo ship. If each tugboat pulled 344KN, what was the resisting force of the ship?
Two large tugboats at A=37° apart tried to dislodge a grounded cargo ship. If each tugboat pulled 344KN, what was the resisting force of the ship?
Using AutoCad with a Force Polygon
Answer is as shown above in the Geometry Length, the resisting force of the ship 652.45KN
Sample 2.
Find the force in the strut (Fc) if all angles are at 45°, Fa & Fe = 26KN, and Fb & Fd= 17KN.
Find the force in the strut (Fc) if all angles are at 45°, Fa & Fe = 26KN, and Fb & Fd= 17KN.
Again using AutoCad with a Force Polygon
Answer is as shown above again in the Geometry Length, the force in the strut (Fc) is 24.042KN
Sample 3.
If a lap joint is held by two fillet welds. Plate width W= 75mm, actual weld size s = 4mm, allowable weld stress is 410/3 = 136Mpa. What is the max load (force).
If a lap joint is held by two fillet welds. Plate width W= 75mm, actual weld size s = 4mm, allowable weld stress is 410/3 = 136Mpa. What is the max load (force).
Sample 4.
A butt weld broke on a tensile test at 146KN. What was the stress on the specimen if it was 52mm wide and
5.9mm thick?
A butt weld broke on a tensile test at 146KN. What was the stress on the specimen if it was 52mm wide and
5.9mm thick?
Calculation.
f= stress, F=Force & A=Area
f = F/A, therefore …
Force =146,000N and
Area =52 x 5.9 = 306.8mm Sq
f = 146000 / 306.8 = 475.88 MPa
the stress on the specimen was
475.88 MPa.
f= stress, F=Force & A=Area
f = F/A, therefore …
Force =146,000N and
Area =52 x 5.9 = 306.8mm Sq
f = 146000 / 306.8 = 475.88 MPa
the stress on the specimen was
475.88 MPa.