【摘 要】
：
An analytical model for the propagation of combined stress waves in a functionally graded thin-walled tube subjected to combined longitudinal and torsional impact loading is established.The material properties of the tube are assumed to be continuously gr
【机 构】
：
CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,Uni
论文部分内容阅读
An analytical model for the propagation of combined stress waves in a functionally graded thin-walled tube subjected to combined longitudinal and torsional impact loading is established.The material properties of the tube are assumed to be continuously graded along the length according to a power law function with respect to the volume fractions of the constituents.The generalized characteristic theory is used to analyze the main features of the characteristic wave speeds and simple wave solutions in the functionally graded thin-walled tube.The finite difference method is used to discretize the governing equations.Two types of typical solutions are obtained for the functionally graded tube and the homogeneous tube subjected to combined longitudinal and torsional step loading.The numerical results reveal some abnormal phenomena in the stress path and wave process of the functionally graded thin-walled tube.
其他文献
梳理了近年来神经网络水印技术的发展脉络,将主流方法大致归为白盒水印、黑盒水印、无盒水印和脆弱水印.综述了神经网络水印的评价指标和上述4种不同类型的神经网络水印技术,探讨了现有神经网络水印方案的优缺点,并对未来的发展趋势进行了展望.
在方面信息情感分类中针对使用循环神经网络编码长距离文本的信息丢失问题,以及使用注意力机制提取情感信息时倾向于关注高频信息偏置问题,提出一种多模特征融合的方面信息情感分类方法,区分单点、多点以及局部三类不同表达模式的情感信息,通过对三类情感信息有侧重的关注、提取与融合,实现各类特征间相互确认与纠错,降低信息丢失与关注偏置问题,达到增强复杂情感表达模式下的方面信息情感分类能力的目的 .实验结果表明,使用所提出的方法对三类情感信息进行提取与融合,可以使方面信息情感分类任务在准确率和F1值指标上得到进一步提升.
The unusual properties of quasicrystals (QCs) have attracted tremendous attention from researchers.In this paper,a semi-analytical solution is presented for the static response of a functionally graded (FG) multilayered two-dimensional (2D) decago-nal QC
In this paper,we propose general strain-and stress-driven two-phase lo-cal/nonlocal piezoelectric integral models,which can distinguish the difference of non-local effects on the elastic and piezoelectric behaviors of nanostructures.The nonlocal piezoelec
A consequence of nonlinearities is a multi-harmonic response via a mono-harmonic excitation.A similar phenomenon also exists in random vibration.The power spectral density (PSD) analysis of random vibration for nonlinear systems is studied in this paper.T
The new rational a-polynomials are used to solve the Falkner-Skan equa-tion.These polynomials are equipped with an auxiliary parameter.The approximated solution to the Falkner-Skan equation is obtained by the new rational a-polynomials with unknown coeffi
A one-dimensional mechanical lattice system with local resonators is pro-posed as an elastic metamaterial model,which shows negative mass and negative modulus under specific frequency ranges.The proposed representative units,consisting of accu-rately arra
The interface crack problems in the two-dimensional (2D) decagonal quasi-crystal (QC) coating are theoretically and numerically investigated with a displacement discontinuity method.The 2D general solution is obtained based on the potential theory.An anal
Boundary constraint induced inhomogeneous effects are important for me-chanical responses of nano/micro-devices.For microcantilever sensors,the clamped-end constraint induced inhomogeneous effect of static deformation,so called the clamped-end effect,has
In this work,the static tensile and free vibration of nanorods are studied via both the strain-driven (StrainD) and stress-driven (StressD) two-phase nonlocal models with a bi-Helmholtz averaging kernel.Merely adjusting the limits of integration,the integ