Question

for what reasons this cyclic movement is getting damaged​

Answer 1

Cyclic fatigue can be defined as the stress, strain, and deformation induced in a material by cyclic loading. Cyclic fatigue life is the number of loading cycles which produce a rupture or breakage in the material. Fig. 7.1 shows the typical cyclic fatigue response in a polymeric material. Polymer fibrils subjected to fatigue stress are oriented according to the stress direction. Under normal stress action, the polymer fibrils are oriented along the normal stress. In plastics under shear action, the polymer fibrils undergo lateral shear deformation. In the latter case, shear bands are produced. Each of these two actions may lead to crazing .

Extra information ⬇️⬇️⬇️⬇️⬇️

Fig. 7.1. Typical cyclic fatigue behavior of polymers.

Fig. 7.1. Typical cyclic fatigue behavior of polymers.Cyclic fatigue may also occur in the pipes under dynamic service conditions. For example, submerged pipes under hydrodynamic forces may experience cyclic-type fatigue. Also, exposed pipes with high velocity of fluid flow may undergo vibratory motions, which may cause fatigue damage in the pipe and its connections. The flutter type instability may also occur in the pipes with high velocity fluid motion .

Reduce cyclic effects⬇️⬇️

Cyclic fatigue is the biggest cause of failure of engineering components. High-speed, low-speed and normally static components frequently fail in this way. The mechanism is well known; cyclic stresses as low as 40 per cent of Re will cause progressive weakening of most materials. One of the major principles of improving reliability therefore is to reduce cyclic effects wherever possible. This applies to the amplitude of the loading and to its frequency.

Typical cyclic effects are:

• Vibration: this is defined in three orthogonal planes x, y and z. It is often caused by residual unbalance of rotating parts.

• Pulsations: often caused by pressure fluctuations.

• Twisting: in many designs, torsion is cyclic, rather than static. Heavy-duty pump shafts and engine crankshafts are good examples.

• Deflections: designs which have members which are intended to deflect in use invariably suffer from cyclic fatigue to some degree. In applications such as aircraft structures, fatigue life is the prime criterion that determines the useful life of the product.

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Answer 2

Answer:

Answer:Cyclic fatigue can be defined as the stress, strain, and deformation induced in a material by cyclic loading. Cyclic fatigue life is the number of loading cycles which produce a rupture or breakage in the material.