挤压、剪切作用在增稠现象中的作用
发布时间：2018-08-08 18:23
【摘要】：一般认为浓厚颗粒悬浮液的稠化现象与颗粒间的剪切作用有关,然而有研究者发现,在冲击试验中,颗粒间的挤压作用可能是悬浮液的稠化主要原因。为了区分挤压和剪切行为在浓厚颗粒悬浮液稠化现象中的作用,设计了拖球、拖片的对比试验,并且考虑了围压及加载速率的影响。研究结果表明,在稠化过程中,颗粒间的挤压作用占据了主导地位,即颗粒间的挤压作用比剪切作用更容易造成浓厚悬浮液的增稠。围压的存在会影响挤压和剪切的作用力,围压的增大对增稠现象有明显的促进作用;相比于剪切作用,挤压作用对加载速率的促进作用更加敏感。
[Abstract]:It is generally believed that the thickening of dense suspensions is related to shearing between particles. However, some researchers have found that extrusion between particles may be the main cause of thickening of suspensions in impact tests. In order to distinguish the effect of extrusion and shearing behavior on thickening phenomenon of dense particle suspensions, a comparative test of towing ball and plate was designed, and the effects of confining pressure and loading rate were considered. The results show that the extrusion between particles occupies a dominant position in the thickening process, that is, the extrusion between particles is more likely to cause thickening of strong suspensions than shearing. The existence of confining pressure will affect the force of extrusion and shear, and the increase of confining pressure can obviously promote the thickening phenomenon, compared with the shear effect, the extrusion action is more sensitive to the acceleration of loading rate.
【作者单位】： 河海大学力学与材料学院;
【分类号】：O347.7
本文编号：2172635
[Abstract]:It is generally believed that the thickening of dense suspensions is related to shearing between particles. However, some researchers have found that extrusion between particles may be the main cause of thickening of suspensions in impact tests. In order to distinguish the effect of extrusion and shearing behavior on thickening phenomenon of dense particle suspensions, a comparative test of towing ball and plate was designed, and the effects of confining pressure and loading rate were considered. The results show that the extrusion between particles occupies a dominant position in the thickening process, that is, the extrusion between particles is more likely to cause thickening of strong suspensions than shearing. The existence of confining pressure will affect the force of extrusion and shear, and the increase of confining pressure can obviously promote the thickening phenomenon, compared with the shear effect, the extrusion action is more sensitive to the acceleration of loading rate.
【作者单位】： 河海大学力学与材料学院;
【分类号】：O347.7
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