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Rheorogical Behavior of Polymer Solids Under Tri-axial Stress Field

三轴应力场下聚合物固体的流变行为

基本信息

批准号：
60470106
负责人：
KAWABATA Sueo
金额：
$ 3.33万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60470106/
关键词：
Rheorogy Polymer solid Triaxial stress Stress relaxation Vオロジー

项目摘要

The mechanical property of polymer solid under multiaxial stress field is an important property of which knowledge is required for the design of advanced composites of polymer/polymer and fiber/polymer systems, however, the property has been little investigated before and it has made difficult the design of the composite. This projest has been carried out mainly for vulcanized rubbers and following results were obtained. (1) The vulcanized rubbers show a quite different rheological behavior in the tri-axial stress field from that in uni- and biaxial stress field. The remarkable difference is that the stress relaxation behavior in the triaxial stress field is not sensitive to either the rubber type or the vulcanization conditions, while it is very sensitive in the uni- and biaxial stress fields. The temperature dependence of the stress relaxation behavior is also different. The higher temperature acceralates the rate of relaxation in the triaxial stress field but decreases in the uni- and biaxial fields. (2) In the triaxial field, the stress relaxation depends on stress level. The lower level increases the rate in the compressional stress state and it becomes the highest rate at a little dilatational stress level,then decreases with increasing the dilatation. (3) The volume modulus in the dilatation state is about 1/2 of that of volume compressional state. The investigation is still being carried out to explain the behavior in the glass-rubber transition region and then in the glass region by using SBR vulcanized rubber.

聚合物固体在多轴应力场作用下的力学性能是聚合物/聚合物和纤维/聚合物复合材料设计中需要了解的一个重要性能，但对这一性能的研究较少，给复合材料的设计带来了困难。本课题主要对硫化橡胶进行了试验，得到了下列结果。(1)硫化橡胶在三轴应力场中的流变行为与在单向和双向应力场中的流变行为有很大不同。显著的区别是，在三轴应力场中的应力松弛行为是不敏感的橡胶类型或硫化条件，而它是非常敏感的，在单向和双向应力场。应力松弛行为的温度依赖性也不同。在三轴应力场中，温度的升高使松弛速率加快，而在单向和双向应力场中，温度的升高使松弛速率降低。(2)在三轴场中，应力松弛取决于应力水平。在压应力状态下，低水平的膨胀率增大，在低水平的压应力状态下膨胀率达到最大，然后随着膨胀率的增大而减小。(3)膨胀状态下的体积模量约为体积压缩状态下体积模量的1/2。研究仍在进行，以解释在玻璃-橡胶过渡区，然后在玻璃区使用SBR硫化橡胶的行为。