O形密封圈的非线性有限元分析

利用大型有限元分析软件ANSYS，考察了橡胶O形圈的大变形引起的几何非线性和接触非线性，建立了橡胶O形圈和沟槽接触的轴对称非线性有限元分析模型，分析了橡胶O形圈在安装使用中，其沟槽内的接触情况和橡胶O形圈内应力的分布规律，为橡胶密封件的设计开辟了一条新方法。从而为进一步可靠设计、优化橡胶O形圈提供了理论依据。     

大型高速环剪实验机的开发与应用

日本京都大学防灾研究所的高速环剪实验机是一种为研究滑坡、泥石流而研制的科研产品,具有较高自动化处理能力。该文记述了该实验机的基本结构、实验原理和主要特点,并对该实验机的改进和开发作了介绍。该实验机经过改进后能够模拟现场应力条件,再现或者模拟滑坡滑动过程,研究滑动机理,测定相应的强度参数,研究不同条件的剪切特性,具有实际应用价值。     

几何大变形箱形阶梯悬臂梁变形分析

提出了分析大变形梁的一种计算方法，并对吊车悬臂的变形进行了分析，推导出了这种渠的计算格式．     

静、动态螺栓变形协调实验测试系统

螺栓变形协调实验是机械类专业的一项重要实验。该文论述了最新研发的测试系统，并成功应用于教学实践，取得了较好的效果。新的测试系统是基于高性能微处理器开发设计的，相对于传统的实验方式，具有功能强大、使用方便、成本低等诸多优点。     

关于大型薄板铸件的加工

本文探讨了印刷机械中大型簿板工作加工过程的工艺问题，从受力的角度，阐述工件夹紧过程中夹紧力与切削用量之间的关系及其控制。     

Zr52.5Al10Ni10Cu15Be12.5 大块金属玻璃的高温宏观硬度

The hot hardness behavior of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass is studied from ambient temperature to the temperature over Tx （the onset crystallization temperature） using a hot macro-hardness tester and scanning electron microscopy （SEM）. The results show that the hot hardness behavior of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass can be classified into 4 zones： the glassy zone in which the hardness almost linearly decreases with the increase of temperature, the viscoelastic zone in which the hardness is nearly unchanged, the viscous flow zone in which the hardness quickly tends towards near zero with temperature, and the crystallization zone in which the hardness sharply increases. The high temperature deformation behavior and the easy processable deformation region for bulk metallic glasses are also discussed on the basis of the hot marco-hardness.     

基于学生化残差计算的变形监测资料奇异值检验

对于任何一个变形监测系统,由于观测条件的异常变化,可导致观测数据中存在一些奇异值,而奇异值对测量系统精度和数据处理结果有着破坏性的歪曲或影响。因此,对含有奇异值的观测数据进行有效判别并予以剔除,是保证获得正确观测结果的重要前提之一。在变形监测资料奇异值的检验中,学生化残差法直接以残差为对象进行研究分析并剔除奇异值,具有较强的直观性、有效性。     

Influence of Rolling Temperature in Supercooled Liquid Region on the Surface Morphology of Zr_(52.5)Al_(10)Ni_(10)Cu_(15)Be_(12.5) Bulk Metallic Glass

1IntroductionSince a non-noble bulk metallic glassy alloy was dis-covered byInoue ,et al.[1]in 1988 , many stable amor-phous alloy systems with higher glass-forming abilityand lower critical cooling rates have been developed .Among them, Zr-based metallic glassy alloys are in-tenselyinvestigated because of their wider supercooledliquid region and other favorable thermodynamic andmechanical properties .In general ,surface morphologyof amorphous alloy parts is veryi mportant forindustri-al and …     

Investigation on Zener-Hollomon parameter in the warm-hot deformation behavior of 20CrMn Ti

INTRODUCTION As one of the main forming materials for warm- forging accurate forming technology, 20CrMnTi cemented alloy steel is usually employed in the fab-rication of wearable parts subjected to medium dy-namic load, such as change gear, gear shaft, cross pin end, hub splines, etc., which are extensively adopted in the automobile industry. The application of warm forging technology (Hirschvogel and Dommelen, 1992; Sheljaskov, 1994; Shivpuri et al., 1994; Siegert et al., 1997; Lange…     

"手"文化及"手"在汉字中的形变

古人从汉字的排列和检索的角度归纳出了部首。“手”在汉字中是偏旁,是部首,是部件。本文探讨了汉字中关于“手”的表示法及其形变的源流,既有历时的梳理,也有共时的比较,同时对现代汉字中“手”的部件的简省、代用和混同现象也有所揭示。