Stress analysis of anisotropic thick laminates in cylindrical bending using a semi-analytical approach

Semi-analytical elasticity solutions for bending of angle-ply laminates in cylindrical bending are presented using the state-space-based differential quadrature method (SSDQM). Partial differential state equation is derived from the basic equations of elasticity based on the state space concept. Then, the differential quadrature (DQ) technique is introduced to discretize the longitu- dinal domain of the plate so that a series of ordinary differential state equations are obtained at the discrete points. Meanwhile, the edge constrained conditions are handled directly using the stress and displacement components without the Saint-Venant principle. The thickness domain is solved analytically based on the state space formalism along with the continuity conditions at interfaces. The present method is validated by comparing the results to the exact solutions of Pagano’s problem. Numerical results for fully clamped thick laminates are presented, and the influences of ply angle on stress distributions are discussed.     

恐龙的晚餐

一只饥饿的恐龙悄悄来到我的家。它已饿了一整天,大大的肚子饿扁扁！     

颜色变变变

让我们想像有5支竖管子排成环状[参见下图]，它们分别被记为A、B、C、D、E，这五个字母代表管中所灌入水的颜色，它们是：琥珀黄（amber）、蓝色（blue）、深红色（crimson）、钻石色（diamond）和翡翠绿（emerald）。由于这些管子排成环     

A declaration on the notion of science

While constantly revealing the laws of the objective world and of mankind itself, science, and technology, whose development is based on the former, have greatly advanced the productive forces of society and brought about changes to people's modes of production and life in general.     

Revisiting non-linear Thomson scattering with metamaterialsOA

<正>Non-linear optics is a branch of optics that studies the intriguing and sometimes unexpected ways in which light and matter interact at high intensities, when the polarization density does not respond linearly to the electric field of the light. The pursuit of the perfect non-linear optical material has been ongoing ever since the pioneering experiment on second harmonic generation carried out by Franken in 1961 [1]. Indeed,     

Green roofs for storm water management: a review

The rapid urbanization and industrialization involve an unsustainable use of natural systems,leading to various problems in cities.The urban hydrological system experiences fluctuating amount of surfac...     

快乐便士

威尔有工作了,弟弟本和妹妹贝特西常向他要零花钱,但过了一段时间,他变得有些不大愿意了。本便和妹妹商量,要让威尔每星期给他们五十便士的零花钱,这样,他们平时就不用再向他要钱了。     

苦苣菜蚜在不同龄期被苦苣菜蚜茧蜂寄生后的发育、存活和繁殖力

寄生性昆虫对寄主各种生命活动的干扰大小依种而异,有些能使寄主很快死亡,有些则对寄主的生存和繁殖无明显影响。很多寄生于不全变态类昆虫的寄生性昆虫,可将卵产在寄主几个或所有龄期的个体中。这些寄生物对同种寄主不同个体的影响大小则又和寄主开始被寄生时的龄期密切相关。自然界的蚜虫种群常常世代重叠,多个虫型、虫期混合出现。它们的寄生蜂能寄生除卵以外的所有龄期。对于这类寄主一寄生物系统,要了解和描述寄生物对寄主数量变动的影响大小,就必须考虑到寄生物产卵时对寄主龄期的选择和寄主开始被寄生时的龄期与受影响大小之间的关系。本工作详细观察了苦苣菜蚜Hyperomyzus lactucae(L.)在不同龄期被苦