宁波329国道北仑至三山线公路工程区内断裂遥感研究

结合一个具体的工程项目，就遥感技术应用于公路工程地质勘察时的技术路线、技术方法进行了阐述，并重点介绍了工程区内断裂的研究结果，对工程的设计与施工提出了建议。     

The effect of plastic constraint on the initiation of ductile tears in shipbuilding structural steels

In this paper, the effect of plastic constraint on the initiation of ductile tears in four different shipbuilding structural steels has been experimentally studied by measuring the J-integral and crack opening displacement COD at initiation in three-point bend specimens with deep and shallow notches. Experimental results of seven groups of different strength alloy steels show that both Si and Ji values of ductile tear from the shallow crack specimens which have less constraint flow field are significantly higher than those of deeply notched specimens. Slip-line-field analysis shows that, for shallow crack, the hydrostatic stress is lower than that from standard deeply cracked bend specimen, which develops a high level of crack tip constraint, provides a lower bound estimate of toughness, and will ensure an unduly conservative approach when applied to structural defects, especially if initiation values of COD and J-integral are used.     

本田轿车VTEC发动机可变配气相位结构及维修

本田轿车ACCORD(雅阁)、CIVIC(思域)车型F22B1和D16Z6发动机装有可变气门正时和气门提升电子控制(VTEC)系统.发动机低速运转时,主进气门以正常的开度开启,而辅助进气门则只是稍微开启,由于主进气门和辅助进气门的开度不同,使燃烧室内产生涡流,从而提高了燃烧效率,降低了发动机油耗.当发动机高速运转时,主进气摇臂与辅助进气摇臂、中间摇臂连接为一体,由于主、辅进气门的开度增大,提高了发动机的输出功率.     

230钢顶铝裙组合活塞的研制

介绍了２３０钢顶铝裙组合活塞的结构特点，活塞顶，活塞裙，连接螺栓，螺套以及活塞销的试制工艺；并对各零件的加工要点作了详细说明。     

某轮主机活塞环异常断裂原因分析

此文结合活塞环的工作条件，对某轮主机气环异常断裂原因进行了分析，并针对该故障的诱发原因对柴油机日常维护管理提出了建议。     

离合器助力器的改良结构（最新实用新型专利产品——专利号：200420025600.5）

汽车离合器助力器是汽车安全性的关键部件。当踏下离合器踏板时，从离合器主缸压出的液压油通过油管进入助力器的内腔，使液压缸内的液压活塞向前推进，带动助力器推杆，使离合器分离。在离合器助力器上有气压助力装置。这一装置控制着压缩空气源，其作用在于当驾驶员操纵离合器时，利用压缩空气来增加输出力，从而减轻驾