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排序方式: 共有989条查询结果,搜索用时 0 毫秒
1.
棉织物手感值的模糊综合评判研究 总被引:4,自引:0,他引:4
利用模糊综合评判数学模型对棉织物的手感值进行了计算与分析,这种方法简单、可靠,与主观评估结果有很好的一致性,为纺织生产的质量判断提供了便利。 相似文献
2.
The purpose of this study is to apply continuum damage mechanics – introduced through the concept of fabric tensors – to composite materials within the framework of the theory of elasticity. A directional data model of damage mechanics for composite materials will be developed using fabric tensors. The introduction of fabric tensors into the analysis of damage of composite materials will allow for an enhanced and better understood physical meaning of damage. The micromechanical approach will be used here to relate the damage effect through fabric tensors to the behavior of composite materials. In this approach, damage mechanics is introduced separately to the constituents of the composite material through different constituents’ damage effect tensors. The damaged properties of the composite system as a whole can then be obtained by proper homogenization of the damaged properties of the constituents.
The derivation of a generalized formulation of damage evolution will be shown here in a mathematically consistent manner that is based on sound thermodynamic principles. Numerical examples will be presented to show applicability. In addition, damage evolution for the one-dimensional tension case is also illustrated. 相似文献
3.
4.
Esmat Koohsaryan Mansoor Anbia Mohammad Sepehrian Mohammad Maghsoodlu 《Journal of surfactants and detergents》2021,24(1):85-97
This study reports the preparation of hierarchical NaP zeolite with the aim of obtaining a non-phosphate detergent builder as an alternative for environmental remediation from eutrophication phenomenon. Hierarchically structured NaP zeolite was easily synthesized hydrothermally and under different syntheses conditions. Samples were characterized using several standard techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and N2 adsorption–desorption analysis. Three powder detergents were prepared by mixing main components such as linear alkylbenzene sulfonate, sodium sulfate, sodium silicate, and sodium carbonate as well as different amounts of as-synthesized zeolite and sodium tripolyphosphate in the detergent formulation as potential detergency builders. Some different detergency tests as pH value, water insolubility, foam height, moisture content, alcohol insolubility, and surface tension measurement were carried out for all synthetic detergent samples and two commercial ones. The results demonstrated that the high cleaning performance of the powders was obtained as using eco-friendly zeolite builders in comparison with phosphate-based commercial and synthetic detergent samples. 相似文献
5.
费钰江 《网络安全技术与应用》2014,(7):243-244
网络是数据中心的一个重要基础设施,而通常分为两大部分:前端计算网络以及后端存储网络.后端的存储网络目前主要是FC网络,不过随着IP技术的发展,采用FCoE技术融合前后端网络成为一种趋势.本文主要关注前端计算网络. 相似文献
6.
In this paper compressive tests of carbon/epoxy (plain weave, 3k) fabric composites were performed to investigate the relation between compressive strength and various bias angles and shear angles. Compressive properties such as chord modulus and maximum strength of the fabric composite materials are essential to analyze the drape behaviour and estimate the quality of the final products. Various specimens with different bias and shear angles which were fabricated by using autoclave de-gassing moulding process were prepared to estimate the strength and chord modulus with respect to the bias and shear angle variations. The stacking sequences of the compressive test specimens are [0]10T, [15]10T, [30]10T and [45]10T for bias specimens and [±37]10T, [±32]10T, [±28]10T, [±22]10T for sheared specimens. Micro-tow structures were observed to correlate the fabric compressive strength with crimp angle. Anti-buckling rig was involved to prevent specimens from buckling during the compressive tests. The compressive test was performed with 1.3 mm/min strain rates. Compressive test results were compared with calculation results. Facture modes which were classified in two different modes were analyzed using microscopic observation. 相似文献
7.
Fabric drapes are typical large displacement, large rotation and small strain problems. Compared with continuum shell finite element methods, methods that skeletonize the fabric sheet into a set of interconnected nodes appear to be more popular in drape problems with extensive wrinkles. These skeletal methods may resort to particle mechanics and formulate the elastic energy or the equations of motion in terms of the node-to-node distance and the angles between the straight lines joining adjacent nodes. Alternatively, beam elements can be employed to skeletonize the fabric sheet at the expense of using rotational in addition to translational nodal DOFs. In this paper, a new skeletal model based on the small strain and curvature assumptions is devised. In contrast to most, if not all, skeletal models for fabric drape simulation, all the stretching, shearing and bending energies in the model are simple polynomials of the grid-point␣displacement. Fabric drape problems with extensive wrinkles are examined. The presence of sharp fold, seam and cut in the undeformed fabric sheet as well as fabric-to-solid contact are considered. The predicted appearances are pleasant and conform to real life observations. 相似文献
8.
为了保障电子档案管理的安全性,基于赋权交易模型的区块链技术对档案管理进行研究。首先建立一个基于区块链技术的框架,具有通用性、易维护性和易搭建性等特点;然后,由于UTXO模型没有解决非确定数值的交易,故针对档案特性对区块链交易中使用的UTXO模型进行改进,提出ET(赋权交易)模型;由于档案管理需要高成本以及高时效性,故采用Fabric的联盟链作为区块生成的方法,以此来降低成本、提高性能。仿真实验结果表明,基于赋权交易模型的区块链技术大大提升了档案管理的稳定性及可用性。 相似文献
9.
苎麻织物增强PLA-PCL复合材料的制备及其性能研究 总被引:5,自引:0,他引:5
采用原位聚合法制备了聚乳酸-聚己内酯(PLA—PCL)/苎麻复合材料。研究了硅烷偶联剂(KH550)预处理、纤维含量以及成型工艺对PLA—PCL/苎麻复合材料力学性能的影响。结果表明,经KH550处理后,复合材料的力学性能有不同程度的提高,拉伸强度由49.84MPa到68.95MPa,弯曲强度由34.84MPa提高到65.06MPa,冲击强度由30.13J/m^2提高到53.54J/m^2。在纤维的质量分数为45%,成型温度为170℃,复合材料具有最优性能;采用原位聚合法制备PLA-PCL/苎麻复合材料,复合材料的界面性能较好。 相似文献
10.
应用3DSMAX7.0软件,采用NURBS曲线建模,通过对控制点三维坐标的调整,绘制出经纬纱的空间交织曲线。将纱线截面模拟成圆形,再经放样功能,实现织物结构的三维模拟。 相似文献