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61.
In this paper a micromechanics model using the concentric cylinder assemblage model and the Mori-Tanaka average stress scheme is used to predict the static strength of unidirectional angle ply laminates. The predicted strengths agree with experimental results for Glass/Epoxy and Graphite/Epoxy systems. 相似文献
62.
化学沉积Ni-P及Ni-Cu-P合金镀层晶化行为的比较 总被引:7,自引:1,他引:6
利用DSC和XRD对化学沉积Ni-P及Ni-Cu-P合金镀层的晶化行为进行了比较研究,结果表明:低磷Ni-P镀层直接转变为稳定相Ni3P,而低磷(高铜)Ni-Cu-P镀层则经生成亚稳中间相Ni5P2后再向稳定相Ni3P转变,高磷非晶态Ni-12.1%P(质量分数,下同)和Ni-17.96%Cu-9.29%P合金镀层均先形成亚稳中间相Ni5P2和Ni12P5后,再转变为稳定相Ni3P,但Ni-Cu-P合金镀层转变为亚稳相的温度比Ni-P镀层的高。 相似文献
63.
This study describes the development of multilayer metal-dielectric graded index solar selective coatings in which the metallic volume fraction increases with depth, from top (air–film interface) to bottom (film–substrate interface). The work is based on computer simulation followed by validation through fabrication of the coatings and optical measurements. The influence of the choice of the number of layers present in a graded index composite selective absorber and results obtained for a new destructive interference bilayer (four-layer system) coating, designed using the computer model, were studied. The design and optimization of the composite coating was undertaken using a computer tool developed within this program of research employing Bruggeman and Maxwell–Garnett effective medium formalisms. The design tool enabled all key design parameters, with the exception of particle size and orientation, to be varied systematically to permit the sensitivity of the optical properties of the selective absorber coating to be studied.The model was validated with a supporting program of experimental research in which many different selective absorbers were prepared by co-sputtering of metal and dielectric materials.Although the best compositional gradation can be achieved by increasing the number of layers, the variation in optical performance beyond a certain number of layers is minimal. The destructive interference produced between adjacent layers contributes to the absorptance. The effect of the number of layers (single, four and 10) has been calculated for various materials such as nickel, vanadium, tungsten, cobalt and chromium based coatings. Solar absorptance of 0.98 and 0.96 was achieved by simulation and experimental findings with less than 0.07 thermal emittance at 300 K for 200 nm thick, 4-PGSAC (four-layer system) of V : Al2O3 composites. Other designs showed lower optical performance for all the material combinations regardless of their individual optical properties. Use of such thin film coating on the absorbers of solar thermal appliances can reduce thermal losses significantly, which could be of importance to the relevant industry. 相似文献
64.
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66.
发射药包装用复合纸桶现状与国内外纸桶对比 总被引:1,自引:1,他引:0
火炸药是易燃、易爆的产品,所以,它对包装要求也是很高的,特别强调它的包装可靠性。近几年来发展上许多国家都采用复合纸桶包装发射药,我厂生产的复合纸要能与国内外纤维板圆桶对比,在技术质量方面都比较先进。 相似文献
67.
This paper considers the robust stability of a linear time-invariant state space model subject to real parameter perturbations.
The problem is to find the distance of a given stable matrix from the set of unstable matrices. A new method, based on the
properties of the Kronecker sum and two other composite matrices, is developed to study this problem; this new method makes
it possible to distinguish real perturbations from complex ones. Although a procedure to find the exact value of the distance
is still not available, some explicit lower bounds on the distance are obtained. The bounds are applicable only for the case
of real plant perturbations, and are easy to compute numerically; if the matrix is large in size, an iterative procedure is
given to compute the bounds. Various examples including a 46th-order spacecraft system are given to illustrate the results
obtained. The examples show that the new bounds obtained can have an arbitrary degree of improvement over previously reported
ones.
This work has been supported by the Natural Sciences and Engineering Research Council of Canada under Grant No. A4396. 相似文献
68.
69.
Service Load Effective Compression Flange Width in Fiber Reinforced Polymer Deck Systems Acting Compositely with Steel Stringers 总被引:1,自引:0,他引:1
This paper reports on the field study of a steel stringer-fiber reinforced polymer (FRP) deck composite bridge in Pennsylvania. The objective of the study is to assess the effective compression flange width in the FRP deck and floor systems when they act compositely with underlying steel girders at service conditions. The research results reported herein support the notion of employing a design approach, for both interior and exterior girders of a composite floor system, that is philosophically consistent with current practice related to steel girders acting compositely with concrete decking. It appears from the results presented herein that FRP decks and floors acting compositely with underlying steel girders exhibit an effective width that is close to the actual girder spacing for interior beams, and approximately one-half this value for exterior beams. 相似文献
70.