Turning region into narrative: English storytelling in the Waterberg.

Paper presented at the Wits History Workshop: The Making of Class, 9-14 February, 198

Hoe de Afscheiding ontstaan is

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Cold-Formed Steel Examples to the Theory and Finite Element Implementation of Plasticity

This paper presents two examples to the theory and finite element implementation of plasticity. The first example is on the cross-sectional behavior of trapezoidal sheeting subjected to a concentrated load. It is shown that the number of elements (and thus the number of integration points) along the corner radius are important for the correct modeling of this static problem. The second example is on the failure of first-generation sheeting subjected to a concentrated load and a bending moment. This problem, especially for large span lengths, can be solved only with explicit dynamic simulations. These are, for our research field, for the first time published here. The explicit simulations normally function with a rather simple integration scheme for plasticity; is shown that our sheeting results are very sensitive to this

Cold-Formed Steel Examples to the Theory and Finite Element Implementation of Plasticity

This paper presents two examples to the theory and finite element implementation of plasticity. The first example is on the cross-sectional behavior of trapezoidal sheeting subjected to a concentrated load. It is shown that the number of elements (and thus the number of integration points) along the comer radius are important for the correct modeling of this static problem. The second example is on the failure of first-generation sheeting subjected to a concentrated load and a bending moment. This problem, especially for large span lengths, can be solved only with explicit dynamic simulations. These are, for our research field, for the first time published here. The explicit simulations normally function with a rather simple integration scheme for plasticity; is shown that our sheeting results are very sensitive to this

The Impact of Immigration on National and Supranational Identity

How does immigration impact national and supranational identity? Current literature does not fully address the relationship between national and supranational identities. Globalization literature indicates that immigration may increase national identification, while immigration literature suggests the opposite. This research further investigates this relationship. Using a logit regression model, I analyze EU countries using the Eurobarometer for citizen’s identification alongside immigration levels from the World Bank. My analysis found that as immigration increases, there is an increase in national identification. This holds important real world implications considering the political climate of European countries and the rise of alt-right parties

The design and purpose of the scientific exhibit

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An Explicit, Dynamic Finite Element Model for the Local Failure of Cold-formed Trapezoidal Sheeting

Trapezoidal sheeting, made of cold-formed, thin-walled steel, is widely used for the construction of cladding and roofs. At an interior support, the sheeting is subject to bending moments and a concentrated load, which leads to possible failure followed by two post-failure modes: the yield-arc and yield-eye modes. Until recently, it was not fully understood why a specific post-failure mode occurs and it was suggested that mode-jumping of the compressed sheeting flange may influence the mode occurring. This paper presents new research, in which both the compressed flange in isolation and the sheeting are modeled by using an explicit, dynamic finite element model. First, it is indicated that the mode-jumping phenomenon is not likely to occur for trapezoidal sheeting as used in practice. Secondly, it will be shown that whether the yield-arc or yield eye post-failure occurs is mainly related to imperfections and the ratio between stresses caused by bending moment and concentrated load. Lastly, a simple yet accurate formula will be derived, which predicts the post-failure mode occurring, thus enabling further investigations into the sheeting\u27s behavior, like moment redistribution and behavior of second and third generation sheeting

'Nterata'/'The Wire': fences, boundaries and cultural resistance in the Potgietersrust District.

Paper presented at the Wits History Workshop: Structure and Experience in the Making of Apartheid, 6-10 February, 1990

Cold-Formed Steel Examples to the Theory and Finite Element Implementation of Plasticity

This paper presents two examples to the theory and finite element implementation of plasticity. The first example is on the cross-sectional behavior of trapezoidal sheeting subjected to a concentrated load. It is shown that the number of elements (and thus the number of integration points) along the comer radius are important for the correct modeling of this static problem. The second example is on the failure of first-generation sheeting subjected to a concentrated load and a bending moment. This problem, especially for large span lengths, can be solved only with explicit dynamic simulations. These are, for our research field, for the first time published here. The explicit simulations normally function with a rather simple integration scheme for plasticity; is shown that our sheeting results are very sensitive to this

Introduction to the Theory and Finite Element Implementation of (Steel) Plasticity

This paper tries to enlighten the subject of (numerical) plasticity by presenting fundamental theory and some very practical examples. For a two-dimensional plain stress state, a Hubert-Henky yield criterion is derived. The flow rule is discussed, including an explanatory numerical example. The yield criteria and flow rule are theoretically applied in a four node finite element. This element is used to show some of the conditions and limitations of a plastic calculation in the finite element method. Finally, a real finite element calculation is made for illustrating the theory derived