10.01.03.011

FAHMIDA HOQUE ID NO: 10.01.03.011

4TH YEAR 2ND SEMESTER

SECTION:ADEPARTMENT OF CIVIL ENGINEERING

Torsion force is a twisting force that is Torsion force is a twisting force that is applied on an object by twisting one end applied on an object by twisting one end when the other is held in position or when the other is held in position or twisted in the opposite direction. Different twisted in the opposite direction. Different materials have a different way of materials have a different way of responding to torsion. Some will deform, responding to torsion. Some will deform, crack or even break depending on the crack or even break depending on the type of material.type of material.

Finding torsion force

*Tie the weight to the end of the string, and attach the other end to the laboratory stand. Adjust the height of the laboratory stand so the weight is hanging a couple of inches from the top of the table.

If the bending force applied to an I-beam does not pass through the center of the beam cross section, the beam will twist, at the same time as bending.

The cracks generated due to pure torsion follow the principal stress trajectories.

The first cracks are observed at the middle of the longer side.

Next, cracks are observed at the middle of the shorter side.

After the cracks connect, they circulate along the periphery of the beam.

DESIGN FOR TENSION FORCE

Equation: k = P*M/Deg

Where:

P = Force exerted on spring (lbs)

M = Moment arm (inch)

Deg =Deflection in (degrees)

k = Spring constant (in-lbs/Deg)

Torsion Spring Constant Design Considerations:

As load is applied to a torsion spring, the springs diameter will decrease, reducing the outside and inside diameters. The spring will also grow in length.

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