双向拉伸管材机头设计

双向拉伸管材机头的模具设计，为了提高管材的纵横向拉伸强度和物料的加工性能，对机头的结构特点，成璎原理和工艺条件作了详细的论述。其应用结果表明：机头设计合理，具有均衡物料的双向拉伸和料流的挤出稳定性，具有显著的抗暴破强度和表面光泽度。

A Review of Current Researches on Blast Load Effects on Building Structures in China

The damages of building structures subjected to multifarious explosions cause huge losses of lives and property. It is the reason why the blast resistance and explosion protection of building structures become an important research topic in the civil engineering field all over the world. This paper provides an overview of the research work in China on blast loads effect on building structures. It includes modeling blast shock wave propagation and their effects, the dynamic responses of various building structures under blast loads and the measures to strengthen the building structures against blast loads. The paper also discusses the achievements and further work that needs be done for a better understanding of the blast loads' effects on building structures, and for deriving effective and economic techniques to design new or to strengthen existing structures.

泄压式爆破坑的设计

封闭式爆破坑生产时振动大、噪声大，并且经常有碎块飞出伤人，国家已规定不允许使用。但由于历史的原因，目前使用的还不少。泄压式爆破坑可以有效的减轻振动和噪声，且无碎块飞出，介绍了泄压式爆破坑在设计上应注意的问题及思路。