I'm going to choose a topic for my thesis and it will be a HCI project. (human computer interaction).
It will be a research project, and I need to think some kind of evaluation for it. I would prefer to not use human users or having to collaborate with psychologist for it.
Is there any metric, or evaluation models I could use instead?
You seem to have missed the point of the first word of the acronym - Human.
You will have to set some sort of criteria for evaluating success in a task and let people try the task.
Different ways to achieve the task can then be compared and contrasted to each (i.e. how many people succeeded in completing the task. With prompting, without etc...).
If you are worried about cost, here is an article about doing usability labs cheaply.