期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
一种测定单向纤维增强陶瓷基复合材料组分“原位”弹性模量的方法 被引量:2
1
作者 程添乐 夏源明 《复合材料学报》 EI CAS CSCD 北大核心 2007年第1期75-80,共6页
提出了一种将细观分析和宏观实验相结合的方法以测量纤维陶瓷基复合材料组分“原位”弹性模量,即利用混合率和Evans等导出的加载后卸载-再加载应力-应变曲线迟滞回环和组分材料力学性能之间的关系,反解出纤维的原位模量。将此方法成功... 提出了一种将细观分析和宏观实验相结合的方法以测量纤维陶瓷基复合材料组分“原位”弹性模量,即利用混合率和Evans等导出的加载后卸载-再加载应力-应变曲线迟滞回环和组分材料力学性能之间的关系,反解出纤维的原位模量。将此方法成功地应用于C/SiC复合材料,初步结果表明此方法是行之有效的,还表明C/SiC复合材料中纤维的原位弹性模量有明显下降。 展开更多
关键词 陶瓷基复合材料 界面 原位模量 饱和裂纹
下载PDF
原位自生TiB_2/A356复合材料拉伸行为的细观分析 被引量:2
2
作者 徐建明 王斐霏 +1 位作者 王浩伟 苏跃增 《材料导报》 EI CAS CSCD 北大核心 2012年第6期137-140,共4页
采用原位自生法制备了TiB2/A356复合材料,并对该材料的拉伸性能进行了研究。结果表明,随着颗粒体积分数的增加,复合材料的弹性模量、屈服强度和抗拉强度增大,而延性稍有下降。断口观察表明,其主要断裂机制为颗粒与基体界面脱粘和颗粒团... 采用原位自生法制备了TiB2/A356复合材料,并对该材料的拉伸性能进行了研究。结果表明,随着颗粒体积分数的增加,复合材料的弹性模量、屈服强度和抗拉强度增大,而延性稍有下降。断口观察表明,其主要断裂机制为颗粒与基体界面脱粘和颗粒团聚内部疏松引起的脆性开裂。针对此种复合材料提出一种弹性模量简化计算模型,同时对其屈服强度也进行了细观分析。 展开更多
关键词 原位自生复合材料弹性模量屈服强度断裂机制
下载PDF
Stability analysis unit and spatial distribution pattern of the terrain texture in the northern Shaanxi Loess Plateau 被引量:4
3
作者 DING Hu NA Jia-ming +2 位作者 HUANG Xiao-li TANG Guo-an LIU Kai 《Journal of Mountain Science》 SCIE CSCD 2018年第3期577-589,共13页
Terrain texture analysis is an important method of digital terrain analysis in quantitative geomorphological research and in the exploration of the spatial heterogeneity and autocorrelation of terrain features. Howeve... Terrain texture analysis is an important method of digital terrain analysis in quantitative geomorphological research and in the exploration of the spatial heterogeneity and autocorrelation of terrain features. However, a major issue often neglected in previous studies is the calculation unit of the terrain texture, that is, the stability analysis unit. As the test size increases, the derived terrain textures become increasingly similar so that their differences can be ignored. The test size of terrain texture is defined as the stability analysis unit. This study randomly selected 48 areas within the Loess Plateau in northern Shaanxi in China as the study sites and used the gray level co-occurrence matrix to calculate the terrain texture. The stability analysis unit of the terrain texture was then extracted, and its spatial distribution pattern in the Loess Plateau was studiedusing spatial interpolation method. Four terrain texture metrics, i.e., homogeneity, energy, correlation, and contrast, were extracted on the basis of the stability analysis unit, and the spatial variation patterns of these parameters were studied. Results showed that the spatial distribution pattern and the terrain texture metrics reflected a trend of high–low–high from north to south, which correlated with the spatial distribution of the landforms at the Loess Plateau. In addition, the terrain texture measures was significantly correlated with the terrain factors of gully density and slope, and this relationship showed that terrain texture measures based on the stability analysis unit could reflect the basic characteristics of terrain morphology. The stability analysis unit provided a reasonable analytical scale for terrain texture analysis and could be used as a measure of the regional topography to accurately describe basic terrain characteristics. 展开更多
关键词 Digital terrain analysis Terrain texture Stability analysis unit Spatial distribution Loess Plateau
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部