Load Path Dependent Failure of 3D Printed Concrete
The essential feature of a material system at failure stage is that it cannot continue bearing further load which is often characterized by its inability to sustain higher stress (i.e. σij* = 0). Consequently, the failure criterion may be defined as singularity of stiffness tensor. However, in practice, most commonly, failure criteria are described as a general function of the stress tensor acting on the material, which in its most general case can be written as F(σij) = 0.
The history of loading in different directions will affect the behavior of the material. In granular materials. This response will also, in turn, change the mechanical properties of the contacts. As a result, the material’s properties during loading will evolve in a generally anisotropic manner. It is, therefore, evident that whether or not a material is failed, is not to be defined by studying the current state of stress, but rather through studying the path of stress.
A micromechanics-based continuum model to investigate the failure behavior of 3D printed concrete will be created and validated by performing material tests. In this approach, inter-particle contacts in different directions are studied separately and the effect of loading on their properties is naturally incorporated within the model. As a result, the model is capable of capturing the loading-induced anisotropic evolution of microstructure and its effect on failure.
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