Monotonic loading predicting failure

It is currently not well established which failure model is most appropriate for predicting failure of fluoropolymers that are monotonically loaded to failure. Commonly used approaches include the maximum principal stress, the maximum principal strain, the Mises stress, the Tresca stress, the Coulomb stress, the volumetric strain, the hydrostatic stress, and the chain stretch. In the chain stretch model, the failure is taken to occur when the molecular chain stretch, calculated fromPl... 

There are four main types of models for predicting failure under monotonic loading. The first type is stress-based failure models. A stress-based failure model, in its most general form, can be written/(ct ) > 0. Since stress is a tensor quantity, the failure model becomes a function of the six independent stress components. Thanks to the difficulty and the experimental effort needed to determine the six-dimensional failure envelope in stress space, the prob-... 

The quantification of the in-plane properties of non-integral infilled frames and the prediction of the failure modes is a rather cumbersome task even when the load is applied monotonically. The problem becomes even more difficult when a dynamic load is apphed, since the hysteretic behavior of the materials and their deterioration with the cyclic loading should be taken into ccmsideration. Chrysostomou and Asteris (2012) discuss these issues and present methods for the determination of the in-plane stiffness, strength, and deformation capacity of infills along with the results of a parametric study that compares these methods and checks them against experimental results whenever possible. Based on the above material, recommendations are made for the in-plane material properties, failure modes, strength and stiffness, as well as deformation characteristics, of infilled frames. 

The developed nonlinear FEM models can be reliably used to assess the design of the proposed connection as they are capable to trace the hysteretic behavior and predict the local failure modes both of the individual WHPs and the connection when subjected to either monotonic or cyclic loading. 

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