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71.
粘弹性阻尼器的性能研究 总被引:6,自引:0,他引:6
本文针对ZN-1和ZN-2粘弹性材料,通过大量试验,首先定量探讨了其力学性能随环境温度、激振频率、变形幅值和滞回圈数等因素的变化情况;随后,就风振控制问题,考察了时间荷载作用下,材料内部的温升平衡情况;最后,在文献〔1〕的基础上,利用试验数据确定了刻画材料力学性能的四参数模型的有关参数。 相似文献
72.
This paper presents the review and studies at various levels of problems concerning the authors’ previous research on the dynamics of vehicle–deck interactions. The various levels of study include the dynamic structural behavior of vehicle–deck systems, vehicle vibrations, damping effects of vehicles on structural systems, dynamic interactions between tire and deck surface, and vehicle securing on decks during ship motions, etc. The study includes analytical, numerical and experimental analysis. Practical problems encountered by Ro–Ro ship designers are addressed by discussing those analysis. It is shown that influences from the dynamics of vehicle–deck interactions are relevant to a number of aspects of issues, such as the excitation frequency range, how detailed information of the structural system response is required, the structure characteristics, and positions and orientations of vehicles on decks, etc. The study contributes to the knowledge for the naval architect and vehicle engineer on how significant the dynamics of vehicle–deck interactions are when dealing with relevant problems. 相似文献
73.
渤海湾西海岸带地区的路堤多为填方型式,且以滨海盐渍土为主要填料.以滨海盐渍土填筑路堤,须解决土的盐胀、溶陷和吸湿软化带来的强度下降和稳定性降低问题,以进行土的改性或固化处理.为降低工程费用,固化材料应以常规的无机材料为主,辅助少量的高分子材料.为研究滨海盐渍土填筑路堤的力学性能,完成了石灰固化土和石灰+SH固土剂固化土... 相似文献
74.
75.
M.Sh. Bafghi A.H. Emami J. Vahdati Khaki A. Zakeri 《International Journal of Mineral Processing》2009,93(2):149-154
Attempts have been made to develop a mathematical expression on the basis of dislocation theory to describe the effect of intensive milling time on the changes of dislocation density as well as amorphization degree of a mineral substance during intensive milling process. Validity of the proposed expression was verified by the results of experiments performed on a natural chalcopyrite mineral as well as those reported in the literature. It was concluded that the expression satisfied the experimental results with a good accuracy. 相似文献
76.
山东龙口北皂煤矿软岩力学特性实验研究 总被引:4,自引:0,他引:4
根据室内实验结果, 本文讨论了北皂煤矿的岩石力学性质, 物化特性。泥质岩类的力学性质和水理性质、物化特性有关。泥质岩类具有显著的流动变形和各向异性。 相似文献
77.
岩石力学性质及可钻性分级研究 总被引:5,自引:0,他引:5
岩石力学性质和可钻性是分析和评价岩石抵抗破碎和钻进的基本性质,也是合理选择碎岩工具和工艺的基础。因此,对岩石力学性质和可钻性的深入研究,采用能够反映某种碎岩方式实质的综合力学性质指标评定岩石可钻性,应用数理统计学原理,依据岩石力学性质和可钻性指标,建立表示岩石可钻性的数学模型,并以此模型进行岩石可钻性分级,可及满足岩土工程施工生产的急需。 相似文献
78.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
79.
80.
Mechanical stratigraphy as a factor controlling the development of a sandbox transfer zone: a three-dimensional analysis 总被引:3,自引:0,他引:3
In thrust belts, fold–fault terminations are common features of the structural architecture and can pose complicated problems to unravel, in particular when two or more terminations are in close proximity. Such terminations usually reflect pre-existing attributes. Amongst the many factors, lateral variations in the mechanical stratigraphy can control along-strike geometry and kinematics of fault-related folds.A displacement transfer zone was produced in a compressional sandbox model by means of two adjacent, mechanically different stratigraphic domains. The experiment allowed two discrete chains to develop in the different domains, so that a complex structural setting occurred in the connecting area. Periclinal folds, oblique thrust fronts and oblique ramps developed in the resulting transfer zone. The interaction between periclines in the transfer zone produced lateral culminations in the folded structures. The analysis of displacement across the structural domains revealed that a significant loss of slip along the faults occurred in the relay zone. In this area, imbricate faulting was partially replaced by layer-parallel shortening. A linear relationship appears to exist between the bed length of the thrust sheet and the related fault slip. 相似文献