CYCLIC ANALYSIS OF STRUCTURAL JOINTS BY COMPUTATIONAL MODELS

摘要

In the paper the computational modelling of joint under cyclic loading is discussed. It is intended to give a general view about this subject. The modelling features are discussed with the aim to obtain accurate and efficient solution for the problem. The basic requirements of the applicable models are given; these result in a highly nonlinear problem to be solved. Accordingly, the nonlinear solution techniques have major importance. The features of efficient solution methods are detailed. In the paper there is a main focus on the verification of the applicable models. It is concluded that the models can not be tested in a single step; instead, a multi-step verification is proposed. The authors have developed a set of benchmark examples which can be used in a step-by-step checking procedure of the cyclic models and computational methods. The benchmark examples are not completed entirely. There is a need for further cyclic benchmark examples which can be done by experimental and virtual testing. It is also proposed to extend the advanced 3D solid monotonic models for cyclic testing of joints, and provide with further benchmark examples on this basis. In the paper an important behaviour component is not discussed, it is the low-cycle fatigue. In the further step of the model development this phenomenon should be considered.