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1 IntroductionRecentresearchhasidentifiedcomposability ,extensibility ,andtailorabilityaskeyaspectsofsys temsthatsupport groupsofinteracting people.Component baseddesignisameanstoachievetheserequirementsin groupwaresystems.Meanwhile,component baseddesignofs… 相似文献
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E. Giner C. Navarro M. Tur F.J. Fuenmayor 《International Journal of Mechanical Sciences》2011,53(3):217-225
In this work, an efficient procedure to predict fatigue lives in fretting fatigue problems is presented. This is accomplished by means of a combined initiation-propagation approach in which the extended finite element method (X-FEM) is used. The procedure is verified by modelling several fretting fatigue tests available in the literature. The application of the X-FEM enables to numerically evaluate the stress intensity factors (SIFs) for cracks of different lengths emanating at the end of the contact zone and to estimate the propagation life corresponding to each of the tests. This propagation life is combined with the initiation life calculated using a multiaxial fatigue criterion (Fatemi-Socie). The predicted lives are then compared with the reported experimental lives, showing that the consideration of the crack-contact interaction through the numerical models tends to improve the life estimation when compared with a fully analytical approach. The procedure can be applied to more general fretting problems for which analytical solutions are not available. 相似文献
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通过对螺旋缝焊管进行静水压爆破试验,得出钢管的屈服压力、最大压力值和爆破压力值,验证钢管成型和焊接工艺的合理性,为管线的设计单位和用户提供参考依据.介绍了螺旋缝焊管静水压爆破试验所用的装置;分析了爆破试验管的管内承压状况、爆破试验过程以及不同起爆点的由来,并以X65钢级Φ813 mm×9.5mm螺旋缝焊管的爆破试验进行... 相似文献
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在SIP服务实现中,传统的多服务器独立工作方案存在资源利用率低和信息更新代价大的问题,基于对等计算的思想,将所有的SIP服务器组织到覆盖网中,对Chord路由表的结构进行改进,采用基于等距地址Hash的多副本发布策略,提出一种改进的多服务器协作方案.给出了该方案与多服务器独立工作方案、基于传统Chord的服务器协作方案的性能比较分析.仿真结果表明,该方案能够确保较高的消息查询成功率和转发速度,减小网络流量开销. 相似文献
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《International Journal of Hydrogen Energy》2022,47(13):8621-8629
As a low-carbon fuel, methane has been used in various engines; however, the studies on its application in hypersonic propulsion are few. Here, oblique detonation waves (ODWs) in methane–air mixtures have been simulated to facilitate methane applications in shock-induced combustion ramjets. The shortcoming of using methane in hypersonic air-breathing propulsions has been presented via examining initiation distance of ODWs. Results demonstrate that ODWs are difficult to be initiated in the methane–air mixture, and similar to normal detonations studies before, this leads to a long initiation length; therefore, methane-fueled ODW is only applicable for high flight Mach number (M0). To broaden the M0 regime, hydrogen has been added to methane to decrease the initiation length. An increasing in the hydrogen percentage leads to the nonlinear decrease of the initiation length, and the initiation structures also vary simultaneously. To elaborate the physical mechanism of the initiation length variation, a theoretical model of the initiation length for fuel blends has been proposed. Meanwhile, the advantages of methane fuel in ODW-based propulsion have been discussed by analyzing on the effects of hydrogen addition on the total pressure. 相似文献