钢球颗粒增强锌铝基复合材料界面微观应力场分析

有限元计算细观力学在复合材料应力传递机制的研究中得到了广泛应用。研究不同情况下复合材料内的应力场分布规律，对认识材料的损伤机制，指导复合材料设计，具有重要的理论与实际意义。本文主要通过有限元对锌铝基复合材料界面微观应力场进行研究，建立单向拉伸（或压缩）情况下的分析模型，计算界面处在拉应力与压应力两种情况下的基体和填充体的应力分布，分析复合材料破坏的根本原因。拉伸应力作用下复合材料经常于界面处产生脱粘，脱粘位置一般发生在极区。压缩时裂纹的产生与扩展机理同拉伸不一样，它不是主拉伸应力的作用，其裂纹的产生与扩展，可能是基体在塑性流变过程中大量的位错在增强相处受阻塞积的结果。

Research on anti-contact fatigue performance of grease containing nano SbSbS_4 particles

Effects of nano SbSbS4particles on contact fatigue life of a steel ball were evaluated on a self-made ball-rod contact fatigue tester. The anti-fatigue mechanisms of SbSbS4 additive were analyzed by means of SEM and EDAX. It was shown that, when the grease contained SbSbS4, contact fatigue life was improved compared with that of base grease. Nanoparticle absorption action, nanoparticle infiltration action, and extreme pressure and anti-friction performance, explained why SbSbS4 increased the contact fatigue life of the steel ball tested.