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您的检索式：作者名="HANS ECKART EXNER"
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| 1 | 体视学和三维显微术:可选的还是相互竞争的显微组织定量分析技术?显示文摘随着现代三维图像显示技术的发展,使用体视学方法从二维截面估计三维几何似乎越来越显得多余了。本文将讨论这两种途径的局限性并概述两者在实际应用中的优点。对场和特征物参量及数据简约问题进行了讨论。结论是,在大量的应用中,体视学方法是表征不规则三维几何的最有效途径。当需要表征比较复杂的参数如形状、排列或尺寸分布时,应当优先采用三维直接测量手段。从二维截面分析获得的参数,对于比较研究、经验相关性分析和“指纹”识别式描述则是非常有用的。 | HANS ECKART EXNER 黄启今 孙亚 | 2003 | 中国体视学与图像分析2003，8，4： | 3 |
| 2 | QUANTITATIVE METALLOGRAPHY FOR THE GEOMETRY OF ROUGH SURFACES IN THREE DIMENSIONS显示文摘Thanks to the development of metallographic and optical techniques, the quantitative characterisation of the geometry of rough surfaces has become very useful in practical applications. Today, numerous different methods are available for determining three dimensional co- ordinates, linear profiles or height contours to a reasonable degree of accuracy and within an acceptable time frame, and for evaluating such data. In this article, the use of such techniques in the field of fractography is demonstrated with reference to a number of case studies dealt with by the author' s own team, supplemented by several examples from other research groups.
The following examples are discussed:In a ceramic material different fracture paths were discerned corresponding to different test temperatures.Inhard metals,it was shown that hoth the sub-critical and supercritical propagation of cracks occurred dalong the same path.From measurements of the proportion of fracture surfaces occurring along and in the various different phases present and the depth of dimples occurring during ductile fracture in the binder phase,the fracture energy of EC-Co-hard alloys with different cobalt contents and tungsten carbide grain sizes was calculated and found to be in excellent agreement with actual experimental results.In the case of ceramic fibre-aluminium matrix cpmposite materials,by measuring the beight distribution of the positions of fracture of the fibres,the load transfer in the region of the fracture surface was determined.with this information a model was developed which explains the significant variation in strength of these materials Finally,a model was developed for metallic materials using which,from the experimentally determined distributions of the height and inclination of the fracture facets,the stress intensity of roughness induced crack closing could he accurately predicted. | Hans Eckart Exner (Institute of Materials Science, Darmstadt University of Technology, Petersenstraβe 23,D-64287 Darmstadt) | 2002 | 中国体视学与图像分析2002，7，2： | 1 |
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