求聚氨酯材料常数
想在Abaqus中模拟一层聚氨酯作为粘弹性材料，哪位高手有聚氨酯材料的常数，任何一种聚氨酯都行. 聚氨酯是泡沫材料，实验数据是不能给的，特别是用于商业用途，学校玩一玩还是可以的。 能说一下：测试数据和橡胶一样吗？ FEA 本构选择？ 本帖最后由 byhyj 于 2009-12-17 16:52 编辑基本上完全不同！
3Elastomeric Sponge (foam) Characterization
3.1Introduction
The analysis of elastomeric sponge materials in finite element analysis sometimes require the use of hyperelastic material models, sometimes require the use of special sponge models and sometimes may be adequately modeled with simplistic spring models. The defining factors are the extent to which the sponge is compressible and the extent to which the foam is compressed in the application. Most complex material models benefit from experimental data in more than one state of strain. If the sponge elastomer is going to be be modeled as a dense elastomer, the basic simple tension, planar tension and equal biaxial test data sets described in the elastomer section may be appropriate. Other experiments that may prove helpful are listed below.
There are 3 strain states which are particularly useful in characterizing sponge (foam) elastomers. They are simple tension with lateral strain measurements, simple shear and simple compression.
3.2Typical Foam Elastomer Experiments:
•Simple Compression
•Simple Shear
•Tension with Lateral Strain Measurement
Many Types of Sponge and Foam Materials
3.2.1 Simple Compression
The compression experiment is also a popular test for elastomers. When testing for analysis, pure states of strain are desired and this is especially difficult to achieve experimentally in compression for dense materials. However, for foam materials, the error due to friction between the specimen and platen is not as significant. Often, the only experiment needed is a simple compression test.
Soft Open Cell Elastomers Foam in Compression
3.2.2Simple Shear
The simple shear experiment is ideal for soft elastomer foam materials where it is often possible to bond or glue the specimen to fixtures.
Simple Shear Test Schematic
Thin Closed Cell Foam Rubber in Simple Shear
3.2.3 Tension with Lateral Strain Measurement
The simple tension experiment for foam elastomers is made somewhat more complex with the addition of lateral strain measurement. This is necessary because the relationship between axial and lateral strain is needed.
Foam Strip in Tension with Lateral and Axial Strain Measurement using a Video System byhyj 发表于 2009-12-17 16:49 static/image/common/back.gif
基本上完全不同！
3Elastomeric Sponge (foam) Characterization
byhyj斑竹，能不能传些关于聚氨酯橡胶的简单实验的测试或计算的相关资料给我看看啊，目前我正在做聚氨酯汽车防撞垫类产品，苦于找不到相关参数及实验方法而停滞不前。谢谢了 楼主，你是怎么在abaqus中模拟聚氨酯材料的呀？
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