Effect of stitching and weave architecture on the high strain rate compression response of affordable woven carbon/epoxy composites

In this study, experimental investigations on stitched and unstitched woven carbon/epoxy laminates under high strain rate compression loading are discussed. Stitched/unstitched laminates are fabricated with aerospace grade plain and satin weave fabrics with room temperature curing SC-15 epoxy resin using affordable vacuum assisted resin infusion molding process. The samples are subjected to high strain rate loading using modified compression split Hopkinson’s pressure bar at three different strain rates ranging from 320 to 1149 s⁻¹. Results are discussed in terms of unstitched/stitched configuration, fabric type and loading directions. Dynamic compression properties are compared with those of static loading. Failure mechanisms are characterized through optical and scanning microscopy.     

嵌入式系统中引导程序的实现

给出了基于ARM7嵌入式系统引导程序的实现流程，并针对嵌入式系统中目标文件的分布装载等技术难点进行详细分析。     

Determination of rock mass deformation modulus by means of traveling load tests—Part I: Theory of the traveling load test in an open pit

A new scheme named the Traveling Load Test is proposed to measure the macroscopic deformation modulus of the floor rock mass in an open pit, covering a volume of rock mass much larger than conventional loading tests. Facility of the test includes extra-large excavators as load-sources on the flat surface and high-resolution borehole tilt-meters installed in rock to detect the microscopic tilt induced by the load. Emphasis is given to the theory of deformation modulus determination, which is applicable to the field where the floor is fully covered by an accumulation of loose blocks of stone produced by blasting damage and/or stress relief. The relation between the induced tilt and the traveling load is formulated, and subsequently it is shown how the deformation modulus is determined by analyzing the induced tilt-loading distance curve, within acceptable engineering accuracy.     

整车振动试验台加载装置分析

介绍了整车振动试验台的加载装置 .对加载装置的横向干扰问题进行了分析 ,得出了补偿量的计算方法 .并对加载装置进行了运动分析 ,建立了速度和加速度的数学模型     

Solaris10操作系统在SUN V890服务器中的安装方法

钟吉太，岳淑华，杨志仁．Solaris10操作系统在SUN V890服务器中的安装方法，物探装备，2006，16（4）：298-300 SUN V890服务器具有强大的处理、解释功能，是在物探地震资料解释中起重要作用的高性能的工作站服务器。为了充分发挥SUN V890服务器的强大功效，必须为服务器安装Solaris操作系统，本文对Solaris操作系统在SUN V890服务器中的安装方法进行了详细地介绍。     

加注过程中液氧的温升和液氧泵的变频调速技术

分析了用泵加注液氧的温升，给出了温升计算公式并举例做了计算。指出采用调速泵加注可以消除因节流引起的能量损耗，降低液氧的温升，最后介绍了用现代变频器实现加注泵调速的技术。     

Correlation between cyclic deformation behaviour and microstructure in a duplex steel between 300 and 773 K

Cyclic tests performed in the temperature range 300–773 K on duplex stainless steel DIN 1.4460 show that the cyclic stress–strain behaviour of this steel is strongly temperature dependent. At 300 and 473 K an almost constant peak tensile stress stage, is followed by a slight softening that continues up to failure in the case of 300 K, but by a secondary hardening at 473 K. Pronounced initial cyclic hardening followed by secondary hardening was the main feature of the temperature range between 573 and 723 K. At 773 K, after a weak hardening stage, a strong softening continues up to failure. The mechanical behaviour and the evolution of the microstructure were analysed, and the internal and the effective stresses were studied. It was found that the internal stress is responsible for the strong hardening that occurs in the intermediate temperature range and for the softening at 773 K.     

Integrity of pressurized components with localized corrosion under internal pressure and transient thermal loading

This paper is devoted to the modelling and analysis of the problem of the safety and residual lifetime of pressurized components (e.g. pressure vessels, apparatus, pipelines) with zones of local corrosion damage. Corrosion damage is the most common form of structural material degradation in service conditions, in particular, in the chemical and gas, and oil industries. Attention is paid to nonstationary regimes of the component operation, e.g., start‐stop regimes. It is shown that the critical parameters calculated taking into account the nonstationary loading can be lower compared with ones determined for the stationary regimes, e.g., on the basis of the ASME Code B31G.     

运载火箭液氢液氧低温推进剂加注技术

介绍了运载火箭低温推进剂加注系统的特点，对加注技术中的主要问题作了回顾与评述，这些问题是，液氢系统的气体置换，预冷过程及控制，加注流量调节，加注过程中的两相流，加注过程中推进剂的温升和过冷推进剂，射前补加及控制。     

反复荷载作用下饱和砂土的一种普遍弹塑性模型

本文建立了一个反映饱和砂土在动荷作用下反应特性的弹塑性模型.该模型通过引入相对应力比的概念使得应力路径上的每一个点都处于加载状态.模型不显式定义屈服面和塑性势函数，而是由破坏面、流动方向、初始加载面、加载方向和塑性模量等部分组成，具有参数少且易确定等特点.通过和试验数据的比较证明了该模型的合理性.