基于静强度分布的复合材料疲劳寿命分布的预测模型(英文)

The reasons of the static strength dispersion and the fatigue life dispersion of composite laminates are analyzed in this article. It is concluded that the inner original defects, which derived from the manufacturing process of composite laminates, are the common and major reason of causing the random distributions of the static strength and the fatigue life. And there is a correlative relation between the two distributions. With the study of statistical relationship between the fatigue loading and the fatigue life in the uniform confidence level and the same survival rate S-N curves of material, the relationship between the static strength distribution and the fatigue life distribution through a material S-N curve model has been obtained. And then the model which is used to describe the distributions of fatigue life of composites, based on their distributions of static strength, is set up. This model reasonably reflects the effects of the inner original defects on the static strength dispersion and on the fatigue life dispersion of composite laminates. The experimental data of three kinds of composite laminates are employed to verify this model, and the results show that this model can predict the random distributions of fatigue life for composites under any fatigue loads fairly well.     

电子封装铝基复合材料线膨胀研究

本文阐述了电子封装铝基复合材料的制备过程，测试出铝基复合材料线膨胀系数。发现经不同冷却处理或者测试不同的方法，其线膨胀都不一样，根据残余应力和择优取向理论解释了这种现象。     

谈生产实践中材料标准的质量

根据工作实践和总结,提出材料及其试验方法标准使用中存在的问题,并结合本厂实际,采取了一系列相应措施,促进了标准的实施。     

液压材料试验机的误差分析及调修（2）

ErrorAnalysisandAdjustmentoftheHydraulicMaterialTestingMachine（2）GongXike（上接本刊1996年第16卷第3期第32页）2.5测力计的机体发生倾斜引起的误差当测力计的机体发生倾斜时，会使测力计产生误差。其倾斜方向可以是任意的，但我们总可以把它分解为前后和左右两个方向的倾斜。这两种方向的倾斜对误差的影响不同。2．5．1机体前后方向倾斜产生的误差当测力计的机体发生前后方向倾斜时，其摆轴轴线与水平面间有一定的夹角△γ，如图3示。XYZ为空间直角坐标系，Z为摆轴正常方向，X为力臂方向，Z’为机体倾斜时的援轴方向。当F=0…     

金属材料互代技术探讨

本文根据金属材料客额管理工作这践，总结了出不同品种规格材料互代的一些经验，对满足企业科研，生产急需很有裨益。