复杂地质条件下建设高产高效矿井之路

五阳煤矿在建设高产高效矿井的实践中,通过技术改造、应用综采低位放顶煤技术、加强矿井质量标准化建设等措施,走出了一条依靠科技进步在复杂地质条件下建设高产高效矿井的新路子。     

静拉伸载荷下93W合金缺口效应和断裂特征研究

研究了９３Ｗ－４．５Ｎｉ－２．５Ｆｅ合金在静拉伸载荷下的缺口效应，并用光学显微镜和扫描电镜观察分析了其变形和断裂特征。研究表明，９３Ｗ合金具有较小的缺口敏感性；缺口试样的变形和断裂与试样的形状有关，而光滑试样的变形和断裂则主要取决于合金微观组织的分布和均匀性。     

一种新的材料动态性能测试方法及材料动态损伤的初步探讨

本文介绍了利用液气高速锤作为加载装置对材料动态压缩性能进行测试的方法、原理及对几种金属材料进行测试的结果,并对材料在这种载荷作用下内部组织的损伤情况进行了研究。指出金属材料(以45钢为例)在应变率为10~(-3)/s下的损伤仍然是一个受位错运动控制的内部微孔洞的产生、扩展和连接的过程。     

NFH-2型大体积液样自动快速辐射加热浓缩制样器

随着工业的飞速发展,液体介质中的微量放射性核素及非放射性有害物质含量的分析日趋重要。如何提高分析方法灵敏度,加快分析测量速度,是从事分析测量方法研究者很关心的问题。为了提高液体样品分析测量的灵敏度,通常是在分析测量之前对样品进行浓缩处理。传统的“砂浴法”是普遍采用的一种,这种方法简单,无需精密设备,当然缺点也非常明显,主要是速度、耗电多,且需要人照看。我们研制的NFH-2型浓缩制样器具有如下特点:     

战斗部材料研究进展

为了改变以往战斗部材料以靶场试验为主的研究模式，提出了战斗部材料发展的新思路，即基于战斗部材料的使用性能，建立计算机模拟、性能表征与材料优化设计三者的集成系统，以计算机模拟取代大量的靶场试验，从而提出了实现目标必须解决的科学问题；总结了相关基础研究取得的阶段性成果；评估了本项研究对未来战斗部发展的影响。     

新型自锐化钨合金材料研究

采用粘结相成分设计方法制备了一种新型自锐化钨合金材料，对所获得的材料进行了微观分析和性能测试。结果表明：与相同钨含量的常规钨合金相比，所制备的新型钨合金材料的动态抗压缩强度很高；在动态压缩加载条件下，材料的破坏形式为沿着试样加载方向（轴向）发生劈裂脱落，基本不出现塑性变形行为，这种特殊的失效模式有利于弹体在侵彻过程中产生“自锐化”现象。     

Finite element analysis and experimental investigation of the hydrostatic extrusion process of deforming two-layer Cu/Al composite

A concave die with an equal-strain contour line was used in the hydrostatic extrusion process to deform the two-layer Cu/A1 composite. The extruding process was simulated using the fi- nite element method （FEM）. The effect of the friction coefficients on the relative slippage of the contact surfaces between the internal and external metals was investigated, and the stress distribu- tion in the extruded specimen was studied. The simulation results reveal that the relative slippage de- creases with increasing friction coefficient at the contact surface of the two metals. However, the relative slippage increases rapidly with increasing friction coefficient at the contact surface between the specimen and die. No axial tensile stress appears in the plastic deformation zone near the axis, indicating that the inner fracture will not occur in internal metal in the hydrostatic extrusion process as the concave die with equal-strain contour lines is used. The experimental test reveals that the met- allurgical bond is formed between Cu and A1 when the friction coefficient at the surface between the two metals is 0. 3 and the extrusion ratio is 12.     

Numerical simulations of stress wave propagation and attenuation at arc-shaped interface inlayered SiC/Al composite

The effects of interface shape on stress wave distribution and attenuation were investiga- ted using finite element method （ FEM ）. The simulation results indicate that when the stress wave propagates from SiC ceramic to A1 alloy, the tensile stress decreases and the attenuation coefficient of the stress wave increases with increasing central angle of the concave interface between SiC and A1. But for the convex interface, the tensile stress increases and attenuation coefficient decreases with increasing central angle. As the stress wave propagates from A1 alloy to SiC ceramic, the atten- uation coefficient of stress wave decreases with increasing the central angle of the concave interface. For the convex interface, the attenuation coefficient increases with increasing central angle.     

等刚度置换原则与FRP汽车驾驶室设计

通过“等刚度置换”原则,探讨了采用FRP设计汽车壳体并达到金属壳体的性能和要求。     

2—重氮—1—萘醌—5—磺酸测定方法的研究

报告了紫外分光光度法测定２－重氮－１－萘醌－５－磺酸含量的方法，水溶液中，波长为４０７ｎｍ时，２－４０μｇ／ｍｌ２－重氮－１－萘醌－５－磺酸与吸光度成直线关第。相关系数为０．９９９９８，平均回收率为１０１．３７％，相对标准偏差为０．７４５％。