Stress – Tension, Compression and Torsion

Every time the machine is executed, a simple machine such as a lever or screw, such as an aircraft landing gear or a hydraulically actuated piston engine, or a more complicated machine, Whether what is called stress will occur. Each time an object inside force reacts like an external force object, such as pressing the weight end lever, it is called stress. Stress is usually measured in pounds per square foot or pounds per square inch (psi).

The external forces acting on the object cause the pressure to appear itself in a combination of one or five of the five configurations. The five forms are extension, compression, twisting, bending and shearing.

Tension is the force trying to separate the object. The fixed sheave is fixed to the two roof beams, and in this chapter the above-mentioned upper pulley block and pulley system are mounted. The movable lower pulley and its two pulleys are suspended with a rope and the weight is suspended under the entire assembly. Tension will be applied to rope and block as weight increases. If the weight is actually pulling the rope, if the weight is too big, it will eventually break the rope.

Compression is the power to try to crush an object. A good example of compression is the assembly of a sheet metal aircraft using fasteners called rivets. Then the aluminum member through the perforated rivet hole, to the rivet gun on one side, the force is applied to the warp rod used on the other side. This applied force tries to spread it to crush the rivet and fill the hole and hold the aluminum piece tightly. [Figure 3-19]

Torsion is a stress applied to an object when it is twisted, which is generated when a torque is applied to the shaft. Torsion actually consists of two other stresses, elongation and compression. When the shaft is twisted, the shaft undergoes tension at the diagonal of the shaft, compression is 90 degrees from tension. [Figure 3-20]

Turbofan engine Turbine shaft is connected to the compressor and drives the compressor under torsional stress. Turbine blades extract energy from high velocity air in pounds. This force in pounds acts along the length from the blade to the center of the shaft, creating a torque that causes rotation. [Figure 3-21]

Compression is different from other stresses that produce intrinsic instability. Tension is the opposite pressure of compression. When tension is pulled apart, compression is drawn together. It is not advisable to reverse the bridge. This is a twisted structure. With a very long suspension span, many large cars run in one direction, rarely run on the other side, the deck twists. Long roads are supported by a single pillar, which can reduce the impact on the lower road. It then must be sufficiently stiff to transfer the asymmetric load to the abut without excessive twist

Torsion is a stress applied to an object when it is twisted, which is generated when a torque is applied to the shaft. Torsion actually consists of two other stresses, elongation and compression. When the shaft is twisted, the shaft undergoes tension at the diagonal of the shaft, compression is 90 degrees from tension. Turbofan engine Turbine shaft is connected to the compressor and drives the compressor under torsional stress. Turbine blades extract energy from high velocity air in pounds. This pound force acts along the length from the blade to the center of the shaft, creating a torque that causes rotation.

The shear stress of the shaft can be resolved into the main stress by the Moll circle. Only then, if the shaft is loaded in a twist, then one of the tensile main stress and others of compression. These stresses are centered on the axis with a helix angle of 45 degrees. If the shaft is made of a brittle material, the shaft is started by the propagation of core cracks in a spiral fashion at surface and shaft failure, 45 ° break. This is usually proved by twisting the chalk on the blackboard with your fingers.

Term: The bottom of the spar receives ______ pressure during flight. Definition: Extended term: Torsional stress consists of ________ and ________ perpendicular to each other. Definition: Compression tension term: What kind of stress or load is the correct design of the rivet joint? Definition: Elasticity and Transparency Terms: If a properly designed rivet joint fails, rivet 1 will be ______. Definition: Term & Pure is caused by: Pressure ________________ ______ occurs due to changes, the A / C structure is most likely to fail. Definition: Please concentrate. Sectional area