I encountered some obstacles when using two-node or zero-length element as shown in the figure below. When I use only one element at the end of beam, the analysis is normal and can converge. But when I use two link elements continuously, the analysis is abnormal and the convergence fails. I tried the following solutions:
1) Two zero-length elements are connected by three nodes in the same position;
2) Two two-node link elements are connected by three nodes at different positions;
3) One zero-length element and one two-node link element;
The materials used for the link element are as follows:
First: 'HyperbolicGapMaterial' and 'Hysteretic' , are combined to form a material by 'Parallel';
Second: 'ImpactMaterial' and 'ElasticPP', are combined to form a material by 'Parallel';
My purpose is to monitor the force-deformation response of the two link elements separately. I would appreciate it if someone could help me solve this problem. Thanks.
So what other simulation methods work well?