对“变厚度圆薄板在均布载荷下大挠度问题”解法的讨论

文献[1]用小参数法和修正迭代法联合求解了“变厚度圆薄板在均布载荷下的大挠度问题”,文[1]中所得到的解以及各种特殊情况都是正确的.但文[1]中求解步骤仍属于摄动法的求解过程,并且文[1]中将载荷项设为:     

变厚度弹性圆薄板问题

一.引言 变厚度的圆薄板常常在机器零件的设计中遇到,例如蒸汽涡输机和活塞的膜片便是。 用平板小挠度理论求解变厚度平板问题并不是容易的事,因此到目前为止,这类的实际问题已解决的为数并不多。     

FREE VIBRATION OF NONLINEAR DEFORMATION RING-AND STRINGER-STIFFENED NONUNIFORM CYLINDRICAL SHELL

Cylindrical shells sliffened with rings and stringers are used in many structural application, (?)h as pipes conveymg fluids or gases and aerospace, In this paper, the (?)eral solution is obtained for free vibration of nonlinear deformation ring-and stringerstiffened cylindrical shell with arbitrary boundary condition by step reduction method, Finally, it is only necessary to solve a nonlinear algebraic equation. This equation is expressed as an analvtic form. Its convergence is proved. Three mumerical examples are (?)iven at the end of the paper which indicate that satisfactory results can be obtained by step reduction method.     

The Bending of Elastic Circular Ring of Non-homogeneous and Variable Cross Section under the Actions of Arbitrary Loads

On the basis of the stepped reduction method suggested in[1],we investigatethe problem of the bending of elastic circular ring of non-homogeneous andvariable cross section under the actions of arbitrary loads.The general solutionof this problem is obtained so that it can be used for the calculations of strengthand rigidity of practical problems such as arch,tunnel etc.In order to examineresults of this paper and explain the application of this new method,an exampleis brought out at the end of this paper.Circular ring and arch are commonly used structures in engineering.Timo-shenko,S.,Barber,J.R.,Tsumura Rimitsu et al.have studied theseproblems of bending,but,so far as we know,it has been solely restricted to thegeneral solution of homogeneous uniform cross section ring.The only knownsolution for the problems with variable cross section ones has been solelyrestricted to the solution of special case of flexural rigidity in linear functionof coordinates.On account of fundamental equations of the non-homoge     

工程中一类非线性弹性元件——碟形弹簧和膜片弹簧的研究进展

本文较详尽地论述了工程中广泛应用的一类非线性弹性元件--碟形弹簧(Belleville 弹簧)和膜片弹簧的研究概况,力学理论在此类问题中的应用现状,并指出了今后有待进一步研究的方向与领域....     

EQUI-STRENGTH DESIGN OF NONHOMOGENEOUS VARIABLE THICKNESS HIGH SPEED ROTATING DISK UNDER STEADY TEMPERATURE FIELD

Considering the mutual interaction between the thickness of the disk and temperaturedistribution,and directly using results in [1],[2] and the iteration method suggested in thispaper,we obtain the equi-strength thickness distribution of nonhomogeneous variablethickness high speed rotating disk under axisymmetrical steady temperature field.     

Unsymmetrical nonlinear bending problem of circular thin plate with variable thickness

Introduction Manystructuralelements(pole,plate,shell)withunevenandvariablethicknessarewidely usedinallkindsofengineeringfields.Engineerscansavematerialswhentheydesignbecause theseelementshavebetteroptimizedshapeofstructuralfeature,butthisaddsdifficultytotheanalysisoftheirmechanicalcapability.Manypreviouspapers[1-4]havesolvedtheproblemof symmetricalaxis,butnobodyhassolvedtheunsymmetricalnonlineardeformationproblemof circularthinplatewithvariablethicknessandunsymmetricalaxisuptonow,afewworkonly …     

THE GENERAL SOLUTION FOR DYNAMIC RESPONSE OF NONHOMOGENEOUS BEAM WITH VARIABLECROSSSECTION

ＴＨＥＧＥＮＥＲＡＬＳＯＬＵＴＩＯＮＦＯＲＤＹＮＡＭＩＣＲＥＳＰＯＮＳＥＯＦＮＯＮＨＯＭＯＧＥＮＥＯＵＳＢＥＡＭＷＩＴＨＶＡＲＩＡＢＬＥＣＲＯＳＳＳＥＣＴＩＯＮＪｉＺｈｅｎ－ｙｉ（纪振义）（ＡｎｈｕｉＡｒｃｈｉｔｅｃｔｕｒａｌＩｎｄｕｓｔｒｙＣｏｌｌ...     

General solution for large deflection problems of nonhomogeneous circular plates on elastic foundation

In this paper, a new method is presented based on [1]. It can be used to solve the arbitrary nonlinear system of differential equations with variable coefficients. By this method, the general solution for large deformation of nonhomogeneous circular plates resting on an elastic foundation is derived. The convergence of the solution is proved. Finally, it is only necessary to solve a set of nonlinear algebraic equations with three unknowns. The solution obtained by the present method has large convergence range and the computation is simpler and more rapid than other numerical methods.Numerical examples given at the end of this paper indicate that satisfactory results of stress resullants and displacements can be obtained by the present method. The correctness of the theory in this paper is, confirmed.     

General analytic solution of dynamic response of beams with nonhomogeneity and variable cross-section

In this paper, a new method, the step-reduction method, is proposed to investigate the dynamic response of the Bernoulli-Euler beams with arbitrary nonhomogeneity and arbitrary variable cross-section under arbitrary loads. Both free vibration and forced vibration of such beams are studied. The new method requires to discretize the space domain into a number of elements. Each element can be treated as a homogeneous one with uniform thickness. Therefore, the general analytical solution of homogeneous beams with uniform cross-section can be used in each element. Then, the general analytic solution of the whole beam in terms of initial parameters can be obtained by satisfying the physical and geometric continuity conditions at the adjacent elements. In the case of free vibration, the frequency equation in analytic form can be obtained, and in the case of forced vibration, a final solution in analytical form can also be obtained which is involved in solving a set of simultaneous algebraic equations with only