在严寒季节施工时砼的防冻与裂缝控制

在-26．5℃～-18℃的低温条件下进行砼工程施工时，依据经验及保温能力预先对砼的出机温度及入模温度进行了假定性计算，而后据此对砼施工的全过程进行了温度控制，确保了砼工程的施工质量，总结出了一套操作性强的技术措施。     

连铸小方坯表面横裂的控制

根据安钢第一炼轧厂近几年的连铸生产实践，系统分析了连铸小方坯发生横裂的原因，其影响因素主要有振动参数，二次冷却、拉速、保护渣的性能及操作因素。通过采取相应的措施，使方坯横裂废品率降到较低水平。     

FEM for evaluation of weight functions for SIF, COD and higher-order coefficients with application to a typical wedge splitting specimen

In the evaluation of accurate weight functions for the coefficients of first few terms of the linear elastic crack tip fields and the crack opening displacement (COD) using the finite element method (FEM), singularities at the crack tip and the loading point need to be properly considered. The crack tip singularity can be well captured by a hybrid crack element (HCE), which directly predicts accurate coefficients of first few terms of the linear elastic crack tip fields. A penalty function technique is introduced to handle the point load. With the use of these methods numerical results of a typical wedge splitting (WS) specimen subjected to wedge forces at arbitrary locations on the crack faces are obtained. With the help of appropriate interpolation techniques, these results can be used as weight functions. The range of validity of the so-called Paris equation, which is widely used in the evaluation of the COD from the stress intensity factors (SIFs), is established.     

落锤试验测定船板的无塑性转变温度

无塑性转变温度是安全设计的重要参量，广泛应用于材料研究和产品质量控制过程。利用落锤试验方法，测定了AH36级船板的无塑性转变温度为-25℃，并对试验结果进行了评定。结果表明，落锤试验方法简单，试验数据重复性好，当船板的服役温度高于NDTT时，基本保证船板不会发生脆断。     

混凝土斜裂纹损伤断裂分析

混凝土构件中宏观裂纹尖端附近，伴随有损伤，随着损伤的发展，微裂纹集度不断增大，合并形成宏观裂纹，本文将Mazars混凝土损伤模型应用于混凝土断裂分析中，带斜裂纹的构件受拉应力作用时，将产生Ⅰ、Ⅱ型复合裂纹．本文分析了宏观裂纹尖端附近区域的损伤，所得结果与最大拉应力理论的结果比较相符。     

Influence of grain boundaries on short crack growth behaviour of IGSCC

Understanding short crack behaviour is essential for predicting the lifetime of light water reactor components. However, crack growth rates of short cracks are unsteady due to microstructural obstacles such as grain boundaries. On the other hand, the statistical behaviour of short cracks can be deduced from crack size distributions. Some papers have pointed out that the crack size distributions obtained by stress corrosion cracking tests showed a kink in the distribution line. This kink suggests that the short crack growth rate is slow compared with that of long cracks. And it can be thought that the slow growth rate is caused by the microstructural obstacles. This study investigated the influence of grain boundaries on the short crack growth behaviour of intergranular stress corrosion cracking. A crack growth simulation model, which considered the mechanical effects of the crack kink and bifurcation by grain boundaries, was developed. The crack depth distribution obtained by the simulation also exhibited a kink in the distribution line as seen in the experimental results. This suggests that grain boundaries play an important role in short crack growth behaviour.     

考虑间隙的压气机转子内部流动的数值模拟

采用时间推进法求解三维N-S方程，开发了一种用于计算考虑顶部间隙的压气机转子内部流场的三维粘性程序。对某压气机转子顶部间隙内的流动进行了详细的数值模拟，计算结果与试验结果吻合良好。通过分析可以发现，动叶顶部问隙的流动将引起叶片顶部气流的欠偏转，从而降低了转子附近相当大区域内的做功能力。同时，对于间隙内细微的流动结构也进行了较为深入的分析。     

双屋架卧位对顶现场检测试验的技术与方法

文章以一个大型屋架的力学性能检测实例为工程背景,介绍在实验室空间条件受限制的情况下,改用在现场对大型屋架采取平卧状态下检测的技术与方法     

砖混结构抗震加固在实际工程中的应用

结合对某高校一幢砖混结构教学楼的裂缝加固工程实例,重点阐述了砌体结构裂缝修补及加固技术,对以后的工程实践有一定指导作用。