The load value required to make stainless steel metal hose or other elastic element per unit displacement is called the stiffness of the element, which is usually indicated by K. If it is the elasticity of the components
The load value required to make stainless steel metal hose or other elastic element per unit displacement is called the stiffness of the element, which is usually indicated by K. If the elastic properties of the elements are linear, the stiffness is no longer constant, but changes as the load increases.
Nominal stiffness
The stiffness given by the elastic element during the drawing calculation is called the nominal (or additional) stiffness. It has errors with the measured stiffness of the element, especially the elastic element with nonlinear elastic characteristics. The nominal stiffness represents the stiffness on the curve, so you need to think carefully. Generally speaking, the nominal stiffness is the best. Do not directly select the delineated calculation value, but the corrected value after the product prototype passes the test.
Stiffness tolerance
The loose scale allowed for the stiffness test of a batch of elastic components. For the same batch of elastic elements, the stiffness of each element is not the same, there is a loose scale. In order to ensure the operational performance of components, it is necessary to have a limit to the scale of stiffness dispersion. For elastic sensitive components, the rigidity tolerance requirement is limited to +/- 5% of the nominal value; for bellows-like elastic components used in engineering, the rigidity tolerance can be limited to +/- 50%.
Sensitivity
The position of the metal bellows and other elastic components when receiving unit load is called the sensitivity of the component. Stiffness and sensitivity are the main function parameters of bellows and other elastic elements, but they are two different ways of indicating the same application characteristics. For different occasions, in order to facilitate the analysis of the problem, any one of the parameters can be used.
Useful area
Regarding the elastic element that completes the pressure-force or force-pressure conversion, there is another important function goal is the useful area. The useful area refers to the size of the elastic element that can be transformed into a concentrated force when its displacement is zero under the effect of unit pressure.
Use life
There are two conditions when the elastic element is under operation; one is to work under certain load and displacement conditions, and insists that the load and displacement remain unchanged or rarely change, which is called static operation; the other application situation is load and displacement Replace and change in cycles. The component is in cyclic operation. Because of the different operating conditions, the form of component damage or failure is also different. The appearance of the elastic sensitive element works within the elastic scale and is basically in a static operating state. The service life is very long, usually reaching tens of thousands to hundreds of thousands of times. The bellows components used in the project are sometimes operated on elastoplastic scale or alternating stress conditions, and the life span is only hundreds of dry times. It is necessary for the component to give the allowable working life in the cycle operation, and to regulate the cycle number, time and frequency.
The extra life of an elastic component is the expected operating life determined when the component is depicted. During this period, the component does not allow the appearance of fatigue, damage or failure.
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