Hydraulic o-rings, hydraulic seals, hydraulic seals and other rubber products and the influence factors of stress deformation formula design considerations:
Rubber is a combination of viscous and elastic (liquid - solid), need time during deformation, cause the deformation of rubber in stress and strain rate effects and temperature conditions.


First, put forward three concepts:
Stress relaxation: under certain conditions, rubber products stretch to a certain length (100% or 200%), observe the stretching stress over time, the phenomenon is called the stress relaxation stress gradually smaller.
Stress attenuation, the main reasons for the strip stress draining and molecular chain exercise to overcome the viscosity resistance.Its characteristic is began to fast and then slow down.This is what we often see initial zha force, big rubber band is not tight after a long day.
Compression permanent deformation: the main is dominated by rubber recovery ability, the factors influencing resilience have forces between molecules (viscosity), the change of the network structure or destruction and displacement between the molecules, etc.When the deformation is caused by the presence of molecular chain of rubber, its recovery (or) the size of the permanent deformation is mainly decided by the elastic rubber, if the rubber deformation accompanied by the destruction of the network and the molecular chain of relative flow, this part is unrecoverable.
In addition to the size of the rubber compression permanent deformation is related to the kinds of rubber, other such as the structure and particle size of filler, vulcanization system, plasticizer, curing time, test specimen shape factors will affect the size of the final result.And as an indicator of sealing rubber products are the most important, to carry out the various factors of system alone or coexist case study of compression deformation is particularly important.
Creep: rubber products, in a certain temperature environment by tensile and shear and compression force, under the action of deformation increases gradually with prolonged, called creep (compression permanent deformation, the stress relaxation in a way can be summed up in creep, personal understanding is only for reference).
Creep deformation regeneration: instantaneous deformation instant reply is reversible;Delay deformation gradually replies and sticky fluid cannot reply.Molecular chain games make internal heating products, delay distortion will vary with temperature rise faster.
So the design formula need to pay attention to:
1, raw rubber and not too much, but analysing or two;
2, on the mixing process and curing conditions is very necessary to note that the three distribution of 7 minutes of process.
3, raw rubber plasticity choice, want to consider the modulus of elasticity of products, the molecular chain rupture in size;
4, a small amount of oil and resin, etc., avoid to cause strain do not reply;
5, vulcanization system had better choose balance vulcanizing system;
6, choose filling agent is, and not the cluster.
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