摘要:

AbstractA tow‐dimensional finite difference wave propagation code was used to analyse the impact of a rigid, ogival‐nosed penetrator with a target consisting of thin alternating layers of silt, sand, and clay. The response of the idealized target was described with an elastic‐plastic constitutive model depending upon two stress invariants and the history of plastic deformation. Interfacial friction between the penetrator and target was assumed to be negligible.Comparisons are made of calculated results and those of nominally similar experiments conducted at the Watching Hill test site in Alberta, Canada. Analysis of these comparisons reveals that numerical methods like the one employed in this study can yield insight into penomena, as well as suggesting possible improvements in the calculation tech

ISSN:0363-9061    

DOI:10.1002/nag.1610010202

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractIn this paper a finite element formulation for a linear viscoelastic ageing material is developed. It is shown that these equations can be solved in the from of an eigenvalue expansion thus reducing the problem to the solution of a set of Volterra Integral equations. An alternative method of solution based on expansion in terms of an operator related to Poisson's ratio is also developed and this solution method is found to significantly reduce the computational effort necessary in the solution of aproblem.

ISSN:0363-9061    

DOI:10.1002/nag.1610010203

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractThe use of discrete models for the dynamic analysis of a contiuum requires the existence of a finite domain with well defined boundaries. When these boundaries do not exist naturally but have to be artificially imposed it may be necessary to apply appropriate conditions on forces or displacements at the boundary nodes to reproduce the physical behaviour of the actual problem. In the solution of soil structure interaction problems these conditions are simulated through the use of transmitting boundaries. In this paper several of these boundaries are evaluated comparing the results they produce in the amplification of seismic motions, the determination of foundation stiffnesses and the structural response. The distance of the boundaries to the zone of interest, the level of excitation (influencing the amount of internal soil damping), the geometry of the problem (finite soil layerversusa half‐space) and the relative frequency of the structure with respect to the soil and the specified motion are all parameters which must be taken into account for this evaluatio

ISSN:0363-9061    

DOI:10.1002/nag.1610010204

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractSeveral finite element schemes for analysis of seepage in porous elastic media, based on different spatial and temporal discretization, were implemented in computer programs. Their numerical performance is evaluated by comparison with the exact solution for Terzaghi's problem of one‐dimensional consolidatio

ISSN:0363-9061    

DOI:10.1002/nag.1610010205

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractThe proposed general analytical model describes the anisotropic, elasto‐plastic, path‐dependent, stress‐strain‐strength properties of inviscid saturated clays under undrained loading conditions. The model combines properties of isotropic and kinematic plasticity by introducing the concept of a field of plastic moduli which is defined in stress space by the relative configuration of yield surfaces. For any loading (or unloading) history, the instantaneous configuration is determined by calculating the translation and contraction (or expansion) of each yield surface. The stress‐strain behaviour of clays can thus be determined for complex loading paths and in particular for cyclic loadings. The stress‐strain relationships are provided for use in finite element analyses. The model parameters required to characterize the behaviour of any given clay can be derived entirely from conventional triaxial or simple shear soil test results. The model's extreme versatility is demonstrated by using it to formulate the behaviour of the Drammen clay under both monotonic and cyclic loading conditions. The parameters are determined by using solely the results from monotonic and cyclic strain‐controlled simple shear experimental tests, and the model's accuracy is evaluated by applying it to predict the results of other tests such as (1) cyclic stress‐controlled simple shear tests, (2) monotonic triaxial loading compression and unloading extension tests, and (3) cyclic stress‐ and strain‐controlled triaxial tests on, this same clay. The theoretical predictions are found to agree extremely well with the experi

ISSN:0363-9061    

DOI:10.1002/nag.1610010206

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610010201

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY