壳体结构冲击模拟壁厚为什么会减小？ 200

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Dear all,

I'm now simulating tube crushing with Abaqus/Explicit. The tube is meshed with shell elements, and general contact is used for contact. As the mesh goes finer, the thickness of elements reduces and there's a warning message as follows:

In step 1, some facet thicknesses for general contact were reduced

from the parent element or specified values due to a large

thickness compared to facet dimensions. The most significant

thickness scaling factor was 0.69815 for a facet on parent element

53801 of instance QQQQ-2. An element set named

"WarnElemGContThickReduce" has been created to locate the regions

of reduced thickness.

I know that such thickness reduction is required by the contact simulation, but can anyone give some comments on to what extent such reduction will influence the final results? and is it possible to know the amount of thickness reduction for each element whose thickness has been reduced. (As the warning message only gives the most significant reduction value). can you gei me some adbice . I attempt to great contact pair and transform to soild module but the mesh hard to draw .

Many thanks and kindly regards,

XIAO.K

WarnElemGContThickReduce

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郑钧 Adam

Thickness reduction is a common issue when you use shell element in Explicit solver with general contact. When self-contact among shell element is detected by general contact, system will automatically reduce section thickness in order to avoid abnoraml physical phenomenon.

This problem can be solved through exclude self-contact of specific part and use keyword to cancel thickness reduction. Please refer to my course for more information about how to avoid thickness reduction when use shell element In Explicit solver.

https://www.jishulink.com/college/video/c15821

2021年1月7日

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