Жесткость контакта a.к.а contact stiffness

[Artem 0]

Во многих системах динамического моделирования при взаимодействии тел необходимо указывать такую величину как жесткость контакта (contact stiffness)... Если не трудно подскажите в какиех пределах изменяется подобная величина допустим при контакте пар сталь по стали, сталь по бронзе...В какой литературе это можно подглядеть?

[Bbyaka 0]

Contact stiffness зависит и от материалов, участвующих в контакте, и от размера елементов на контактирующих поверхностях. Вот, например, как это дело объяснено в ANSYS Structural Analysis Guide... Прошу прощения, что по-английски - у меня другого нет.

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You need to supply a value for the contact stiffness, KN. (There is no default value supplied for KN.) KN should be large enough that it reasonably restrains the model from over-penetration, yet it should not be so large that it causes ill-conditioning. For most contact analyses, you can estimate values for KN as follows:

KN fEh

where:

f =

Factor that controls contact compatibility. This factor will usually be between 0.01 and 100; using f = 1 is often a good starting value.

E =

Young's Modulus (if you have contact between two different materials, consider using the smaller value of E).

h =

Characteristic contact "length." The value you use here depends on the particular geometry of your problem:

In 3-D configurations, h should be equal to a typical contact target length (that is, the square root of the target area) or a typical element size. For most flexible-to-flexible contact problems, you will usually find that the average size of elements in contact will be nearly equal to the average target length. In situations in which the target lengths differ significantly from typical element sizes, you should use the typical element size for h.

In 2-D plane stress or plane strain applications, let h = 1 for plane strain and plane stress without thickness input, and let h = "thickness" for plane stress with thickness input.

In 2-D axisymmetric analyses, let h equal the average radius where you expect contact to occur.