Rigid Plasticity Analysis of Defect Beam Suffering Step Loads

摘要

It's a most common dynamics phenomenon of subject to impact for the structural beam. The conclusions drawn from dead load status cannot be always applied to the circumstance directly when the structure is suffered to impact loads. The deformation models of structure beam caused from impact-load cannot be even explained by the analysis of dead load status. In this paper, by selecting the constitutive modelnigid plasticity, of cantilever beam with a main crack suffering to step load status, analyzes its deformation history. We can find that there is a quite different reactivity between defective beam and non-defective beam and the beam will have a counter movement when effected by strong impact load due to the existence of crack effect. In the end of the analysis, benchmark examples are provided respectively. This paper introduces the usual crack phenomena into impact dynamics, referring to previous research and obtains a primary research which is necessarily be verified by more experiments. However, the conclusion is drawn under the premises, such as the centralization of crack effect, and neglecting the subordinate effect.