Graduate Thesis Or Dissertation
A Study of Bounding Surface Plasticity for Sands Pubblico Deposited
- Abstract
In this study the capability of the theory of bounding surface plasticity to provide reasonable description of various observed behavior of sand under homogeneous monotonic and cyclic loading conditions is examined.
The primary model considered in this study is Bartlet's model with 12 material properties which can be determined from experimental results. One of the features of this class of theories is that plastic deformations are allowed to occur even at stress states within the bounding surface. This is in contrast to the conventional plasticity where only elastic deformations are to occur inside the yield surface.
The model is found to give good qualitative predictions for monotonic loading conditions with regard to the occurrence of strain softening, and stress dilatancy for sand. However, for cyclic loadings the model predictions are not as satisfactory. In particular, the model shows unstable behavior under half cycle unloading-reloading conditions due to some energy extraction. This unrealistic result is thought to be a consequence of the definitions concerning (i) the plastic loading index, (ii) the mapping rule, and (iii) the plastic modulus. Remedy to the problem is investigated by modifying these 3 definitions. From these modifications, the results show that the problem of open loops could be
improved.
- Creator
- Date Issued
- 1998-03-25
- Academic Affiliation
- Advisor
- Committee Member
- Degree Grantor
- Commencement Year
- Publisher
- Ultima modifica
- 2024-03-06
- Resource Type
- Dichiarazione dei diritti
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cven_td_1988BoutalebMStudyOfBounding.pdf | 2024-03-06 | Pubblico | Scaricare |