混凝土材料动力特性试验

用回归和数理统计的方法对混凝土的纵横波波速比、泊松比进行了分析 ,并从理论上探讨了两者的内在联系 ;此外 ,将混凝土的变形机理与各类砂土的变形机理进行了对比 ,对扩容现象进行了合理解释 ,并对应力、应力率、应变率之间关系进行了动力学分析 .结果表明 :在同一围压条件下 ,随着加载速率的增大 ,应力 应变曲线由硬化逐渐向软化过渡 ,且呈现剪胀性的趋势增强 ;

不同应变率下铅锌尾矿砂混凝土动态抗压力学性能试验研究

为了研究铅锌尾矿砂对混凝土动态抗压强度的影响,利用直径为100mm的分离式霍普金森压杆试验系统对尾矿砂掺量分别为0%、20%、40%、60%的铅锌尾矿砂混凝土试件进行动力压缩试验,对铅锌尾矿砂混凝土的动态抗压力学性能进行分析。结果表明:铅锌尾矿砂混凝土是一种典型的应变率敏感性材料,其动态抗压强度和极限应变均随着应变率的增大而增加;铅锌尾矿砂混凝土的应变率敏感性较普通混凝土的低,其碎块平均尺寸的应变率敏感性低于普通混凝土;不同尾矿砂掺量的混凝土动态抗压强度不同,随着掺量的增大呈现先上升后下降的变化趋势,掺量为20%左右时,动态抗压强度最高。通过使用离散元软件模拟掺量为20%组试件在不同应变率下的破坏情况,发现模拟出来的结果与试验结果能较好地吻合。

轴流压缩机动叶片模态分析方法研究

基于某轴流压缩机第1级动叶片,在精确建立其几何模型的基础上,通过有限元仿真方法提取了前10阶固有频率及模态振型的计算值,然后通过试验测试方法对其进行了模态测试,得到了前10阶固有频率及模态振型的实测值,并将理论计算结果和实际测试结果进行了对比。

Strength failure and crack coalescence behavior of sandstone containing single pre-cut fissure under coupled stress, fluid flow and changing chemical environment

In order to study the strength failure and crack coalescence characteristics of cracked rocks, uniaxial compression experiments were conducted on cylindrical sandstone specimens, sampled from Longyou Grottoes of Zhejiang Province, China, with a single pre-cut crack soaking in different chemical solutions. Based on the results of uniaxial compressive test under different chemical solutions and velocities of flow, the effect of strength and deformation characteristics and main modes of crack coalescence for cracked rocks under chemical corrosion were analyzed. The results show that the pH value and velocity of the chemical solutions both have great influence on the sandstone sample's uniaxial compressive strength and deformation characteristics. Cracked sandstone samples are tension-destructed under uniaxial compression, and the crack propagation directions are consistent with the loading direction. The phenomena of crack initiation, propagation and coalescence of sandstone are well observed. Four different crack types are identified based on the crack propagation mechanism by analyzing the ultimate failure modes of sandstone containing a single pre-cut fissure. The failure process of specimen in air is similar with the specimen under chemical solutions, however, the initial time of crack occuring in specimen under chemical solutions is generally earlier than that in the natural specimen, and the crack propagation and coalescence process of specimen under chemical solutions are longer than those of the natural specimen due to softening of structure of rock caused by hydro-chemical action. Immersion velocity of flow and chemical solutions does not have influence on the ultimate modes of crack coalescence.