The basic concept for the uncertainty of the testing has been described in this article,the relative uncertainty of the flexural strength for the TiB2 ceramic has been evaluated.For brittle materials such as technical ceramic,type A evaluation of uncertainty is the main source of combined standard uncertainty when testing in a advanced instrument.This can be a reference for evaluating other mechanical properties of ceramic.

The gauge factors(GF) have been tested with the unidirectional and orthogonal CFRP materials by the edge four and inner four electrodes configuration methods respectively under recycling dynamic loading.The result shows that he GF of unidirectional CFRP is opposite with the electrodes configuration.The test value is 3.06 with the edge four electrodes configuration and-4.76 with the other configuration and the mechanism is also studied.The edge four electrodes configuration should be adopted to get the real electric resistance-strain coefficient.

Filling QS-2、Thiokol and liquid CTBN in the system of expoxy with changed-Amide,through the test on shear strength,bending elasticity modulus,bend strength and scanner photos,we can see proper compound flexibilizer has good synthetical function for mechanical property.

The mechanical properties of Li2O·2SiO glass-ceramic used for computer disk were examined and the testing results were statistically analyzed. The Weibull distribution of the flexure strength, flexure elasticity modulus and Vickers hardness of the glass-ceramic indicates that this glass-ceramic has high dependability and is a potential advanced material for computer disk substrate.

The tensile strength of two kinds of steel fiber is tested using different clipping method respectively.The results indicate that during testing the undulant clamp A has least damage for steel fiber than dentate and undulant clamps,so with this kind of clamp we can obtain the best and exact tensile strength.And this kind of clamp is the effective method for testing tensile strength of steel fiber.

Cold mix asphalt recycling technology has a wide application prospect. This paper elaborates cold recycling mix (CRM) design using emulsified bitumen and foamed bitumen as a main stabilizer; and then design the structure of flexible base layer of CRM on the base of laboratory's test. Finally in term of experimental road, conclude the techniques of mixing, paving and compacting of Cold Mix Asphalt Recycling macerial.

The principle and features of MTS810 are introduced,and the applications of MTS810 for evaluating mechanical property of ceramics in normal and high temperature environment are discussed.

对单向及正交碳纤维增强树脂基复合材料(CFRP)在静态拉伸及动态拉-拉载荷作用下的电阻-应变特性进行了研究.结果表明:正交及单向CFRP复合材料在静态拉伸载荷作用下,其电阻变化率随着应变增加表现为3个阶段:较为迅速增加的线性阶段、非线性平缓阶段和阶梯状迅速增加阶段,其实质反映了材料内部纤维在不断增加的应力作用下逐步伸长、变形和断裂的过程,因此可以在结构-智能结构中作为传感材料用于结构完整性的自诊断和自监测;在较小应力幅值(24%)的交变载荷作用下,2种材料的电阻变化率都表现出明显的电阻-应变特性和一定的可逆性,单向CFRP复合材料的电阻变化率较正交CFRP复合材料对应变更敏感.

比较了素混凝土、整体式钢纤维混凝土及层布式钢纤维混凝土的力学性能,结果显示,在较小体积含量的情况下,钢纤维通过对基体裂纹萌生和发展的抑制,有效地改善了混凝土的脆性。整体式钢纤维混凝土与层布式钢纤维混凝土在力学性能上表现出相当的一致性。

Digital modification of data acquisition and analysis for MTS810 ceramic testing system have been completed, therefore, the instrument can collect and analyze the measurement data automatically, otherwise the work of data management has been reduced largely and the reliability and veracity of testing results have been increased.

介绍了电流变液智能材料的基本特性和它在土木工程减振结构体系、机械加工颤振控制、流体动力传输及汽车工程等方面的应用。

Today, carbon fiber reinforced composite has been a focus of material science, because of its excellent integrative properties. In this paper, the concept and properties of carbon fiber are introduced. At the same time, as structural material, structural-functional material and functional material, some usages of CFRP are discussed.

介绍了CFRP层板疲劳损伤研究方面的主要模型.剩余强度来度量疲劳损伤破坏准则清楚明了,但实验工作量大、费用高,并且一个试件只能得到一个数据;剩余刚度可在疲劳试验过程中连续测量而不影响材料的性能,但破坏准则较难确定,弹性模量对损伤不很敏感;用电阻的变化来反映碳纤维层板结构的疲劳损伤操作简单易行,具有较高的工程实用价值.

利用扫描电子显微镜(SEM)研究了两种铝矾土和用两种铝矾土配料煅烧的硫铝酸盐水泥熟料的微观结构形态,探索了铝矾土的的微观结构对硫铝酸盐水泥熟料质量的影响,指出了铝矾土结构密实、硬度大造成生料易磨性差,是最终导致硫铝酸盐水泥快凝的主要原因.

By using scanning electron microscope (SEM) the hydrate of highly free-calcium oxide (f-CaO) cements is studied, and the distribution and crystalline characteristics of calcium hydroxide in cement are investigated and the different boundary characteristics between calcium hydroxide with CSH at early hydration stage and later as well. The slow hydrate of f-CaO crystals distributed as big-piles in cement clinker results in the constant growing of Ca (OH) 2 crystals. This is the main reason for that the cement stability is not certificated.

运用扫描电子显微镜、X射线衍射仪、原子吸收光谱仪等现代化分析测试仪器,从硫铝酸盐水泥熟料的矿物组成、矿物微观结构更深入地探讨了引起硫铝酸盐水泥熟料快凝的原因.提出了解决和防止硫铝酸盐水泥熟料快凝的方法.为生产厂家生产凝结时间合格的硫铝酸盐水泥提供了科学依据.