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1.
论高校基础实验室的跨越式发展与可持续发展 总被引：6，自引：4，他引：6
针对新世纪对高素质创新人才的需要，分析了当前高校工科基础实验教学中的现状和普遍存在的问题，论述了实验室建设和发展中的矛盾和多样性，结合上海大学基础力学实验教学课程设置与改革的状况，提出了转变观念、深化改革、锐意创新、以人为本，建立现代实验教育新理念的办学思路。 相似文献
2.
1 Introduction Withtherapiddevelopmentofcomputertechnology,digitalcontrolsystemsarewidelyusedinengineeringandresearch.InsomedigitalcontroldevicessuchasaGermanmadeWDWtestingmachineequippedwiththeDOLIsystem,however,duetoproblemsinsoftwareupdatingandlocalization,thefunctionareinsufficient.Forexample,thesystemsoftwareislimitedtothemeasurementofconventionalmechanicalproperty,incapableofmeasuringfracturetoughnessKICofmaterials.Asfracturetoughnessofmaterialsisanimportantparameterformaterialsev… 相似文献
3.
The analyses of finite deformation and stress for a hyperelastic rectangular plate with some voids under an uniaxial extension were conducted. The governing differential equations were given from the incompressibility condition of the material. The solution was approximately obtained from the minimum potential energy principle. The growth of voids was discussed. One can see that an initial central circular-cylinder void becomes an elliptic-cylinder void, but an initial non-centeral circular-cylinder void becomes an elliptic-like cylinder void and the center of void has a shift. The stress distributions along the edges of voids were given and the phenomenon of stress concentration was observed. The influences of the distribution manner and size of voids, as well as the distance between them on the growth of voids were analyzed. 相似文献
4.
考虑剪切效应有限变形粘弹性板的动力稳定性 总被引：4，自引：0，他引：4
Based on Reddy‘s theory of plates with higher-order shear deformations and the Boltzmann superposition principles,the governing equations were established for dynamic stability of viscoelastic plates with finite deformations taking account of shear effects,The Galerkin method was applied to simplify the set of equations.The numerical methods in nonlinear dynamics were used to solve the simplified system.It could e seen that there are plenty of dynamic properties for this kind of viscoelastic plates under transverse harmonic loads.The influences of the transverse shear deformations and material parameter on the dynamic behavior of nonlinear viscoelatic plates were investigated. 相似文献
5.
粘弹性开敞浅壳的动力学性质 总被引：1，自引：0，他引：1
On the basis of the Kármán-Donnell theory of thin shells with large deflections and the Boltzmann laws for linear viscoelastic
materials, the mathematical model for viscoelastic open shallow shells was formulated. By using the Galerkin average method,
the original integro-partial-differential dynamic system was simplified as a integro-ordinary-differential dynamic system,
which can be transformed into a ordinary differential dynamic system by introducing new variables. The dynamical behavior
was studied by some classical methods. Dynamical properties, such as, chaos, strange attractor, limit cycle etc., were discovered.
Supported by the Development Foundation of Shanghai Municipal Commission of Education (99A01) 相似文献
6.
本文根据 E.Reissner 板理论,利用δ—函数的性质,得到了集中力、集中力矩以及任意线分布载荷作用下两对边间支另两对边为任意的矩形板弯曲问题的一般解,从而构造了 Green 函数。对于任意横向分布载荷及分布弯矩作用的情况,利用选加原理,只须对载荷作用区域积分便可得到相应问题的解。 相似文献
7.
Dynamical Behavior of Nonlinear Viscoelastic Timoshenko Beams with Damage on a Viscoelastic Foundation 总被引：2，自引：0，他引：2
Based on convolution-type constitutive equations for linear viscoelastic materials with damage and the hypotheses of Timoshenko beams with large deflections, the nonlinear equations governing dynamical behavior of Timoshenko beams with damage on viscoelastic foundation were firstly derived. By using the Galerkin method in spatial domain, the nonlinear integro-partial differential equations were transformed into a set of integro-ordinary differential equations. The numerical methods in nonlinear dynamical systems, such as the phase-trajectory diagram, Poincare section and bifurcation figure, were used to solve the simplified systems of equations. It could be seen that simplified dynamical systems possess the plenty of nonlinear dynamical properties. The influence of load and material parameters on the dynamic behavior of nonlinear system were investigated in detail. 相似文献
8.
不可压各向异性超弹性材料中的空穴生成 总被引：3，自引：0，他引：3
The cavitation problem in a solid sphere composed of an incompressible anisotropic hyper-elastic material under a univroms radial tensile dead load was examined.A new analytical solution was obtained.The stress contruibutions were given and the jumping and concentration of stresses were discussed.The stability of solutions and the effect of the degree of ainsotropy of the material were analyzed. 相似文献
9.
谈高校基础实验室的建设与改革 总被引：7，自引：4，他引：3
结合上海大学力学实验室的建设与发展,分析了高校基础实验室普遍存在的实验课时压缩、经费短缺与教学要求不断提高的矛盾,就主体和客体两个方面探讨了矛盾存在的条件与解决的途径,为推动高校实验教学改革、全面提高学生素质提供了有益的参考. 相似文献
10.
The finite deformation and stress analyses for a rectangular plate with a center void and center void and made of rubber with the Yeoh elastic strain energy function under uniaxial extension were studied in this paper.An approximation solution was botained from the minimum potential energy principle.The num,erical results for the growth of the cavitation and stresses along the edge of the cavitation were discussed.In addition,the stress concentration phenomenon was considered. 相似文献