Influence of rubber ageing on damping capacity of rubber vibration absorber

Abstract

The vibration dampers, shock absorbers, seismic isolation, bearing seals, compensation devices are widely applied in civil engineering, machine manufacturing and shipbuilding, aviation and aerospace engineering. For these details fabrication elastomeric materials are used. Rubber and rubber-like materials (elastomers) have the capability of absorbing input energy much better than other engineering materials. Elastomeric materials give many engineering advantages due to their high elasticity, good dynamic properties, low volume compressibility, a linear relationship between stress and strain at small and middle deformation, resistance to aggressive environmental factors. The disadvantage of elastomeric materials is ageing, i.e. changing their mechanical properties over time and lowering their operational capability. In given paper the influence of ageing of elastomeric materials on the damping properties of shock absorbers is considered based on the mechanical models of elastomers -Maxwell and Burgers modes.

Analysis of Dynamic Properties and Movement Safety of Bogies with Diagonal Links and Rubber-Metal Vibration Absorbers Between the Rubbing Elements of Freight Cars

“…23 and 24 that an increase in the dissipation factor leads to a decrease in the dependence of parameters c and d on frequency. It should be noted that the value of τ = d/C in rheology, it is called the relaxation time [28]. Therefore, the shorter the relaxation time is the more sensitive the element is to the frequency of vibrations [29].…”

“…During operation, they ensure mutual compliance in three linear and three angular directions. However, the proposed model is simple in design and can be installed between the axle-box and the side frame without making changes to the bogie design [28]. To reduce wear in friction units and consequently, the overhaul mileage of the model 18-100 bogie shall be increased.…”

Improved Dual Network Model for Aging of Rubber Composites under Set Strains

“…In soft rubber and polyurethane tires, a large permanent set can lead to flat spots that increase noise and reduce fuel efficiency . Permanent sets can negatively impact rubber seals. , Chemical stress relaxation in rubber vibration dampers can alter their ability to work effectively. , The process of chemical stress relaxation, studied by Tobolsky and co-workers, ,– is distinct from viscoelastic stress relaxation and is called chemical stress relaxation. Tobolsky put forward a model that is still widely used and tested. – Tobolsky proposed that chemical stress relaxation was the consequence of chemical reactions taking place in the rubber molecules that break and reform cross-links in the polymer network.…”

“… 4 , 5 Chemical stress relaxation in rubber vibration dampers can alter their ability to work effectively. 6 , 7 The process of chemical stress relaxation, studied by Tobolsky and co-workers, 2 , 8 – 10 is distinct from viscoelastic stress relaxation and is called chemical stress relaxation. Tobolsky put forward a model that is still widely used and tested.…”

The Fatigue Wear Process of Rubber-Metal Shock Absorbers

“…In the case of materials used for shock absorbers, these parameters have been theoretically characterized and practically verified [ 7 , 8 , 9 , 10 , 11 ]. The durability of shock absorbers is of fundamental importance in shipbuilding engineering, which is mainly related to the resistance to cyclical loads and environmental impacts, primarily related to temperature and immersion in aggressive liquids [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. According to [ 16 , 17 ] one of the most widely used techniques to predict the lifetime of polymeric materials is the use of the Arrhenius equation; however, it will not be used in this work.…”