以毛竹纤维细胞壁(BFCW)为研究对象,运用纳米压痕技术对BFCW的蠕变性能和松弛性能进行了研究.通过设计不同的加载方式,得到了纳米压痕的载荷与压入深度的关系曲线;通过拟合不同应变率的实验结果数据,计算得出了BFCW的蠕变应力指数.研究了BFCW在不同压入深度、加载速率、保载时间下的松弛行为,分析了不同的载荷、加载速率、保载时间对BFCW蠕变行为的影响.结果表明:BFCW纵向和横向具有不同的力学性质,在纵向表现出更明显的松弛特性和更强的抗蠕变变形能力;BFCW的蠕变行为随着压入载荷的增大愈加明显,表现为蠕变位移和蠕变速率增大;BFCW纵向的压入深度和蠕变位移量均比横向的小,在最大压入载荷为15mN时,其差值分别达到了24.96％和32.25％;BFCW的松弛模量、载荷松弛量与压入深度呈正比;BFCW纵向的松弛能力比横向的强,在加载速率为50nm/s时纵向载荷松弛量较横向高34.58％.

Combined with concrete practical projects,it discusses tunnel digging of frictional pile bridge.Through the methods of reinforced pile,bottom floor pile pouring,sectional pouring in cave and improvement of supporting parameters,it ensures the safe tunnel digging and the normal operation of high-supporting bridge,which can be reference for familiar projects.

Because of complex structure in designing large industrial production, it’s difficult to train who use these production. In order to make users thoroughly understand the internal structure and the process of assembly and disassembly of complex organ, we propose to use the technique of dynamic simulation to display interior configuration of the production. During the dynamic assembly and disassembly, we apply human-computer interaction to demonstrate this product. Take bogie used by railroad passenger car for example, we design a system for simulating three-dimensional dynamic assembly and disassembly of the production. The paper mainly includes the research for the exploitation method of the system. It also expatiates that: the achievement of the system design, the selection and feature of the tools, the design procedures and methods of the system.