The development of Crystal plasticity
Recent experiment have shown the size effect of the materials, when the characteristic length associated with non-uiform plastic deformation is on the scale of micros.The classic plasticity theories can't explain such phenomenon as their constitutive models posses no intrinsic length scale. The new models which contain strain gradient plasticity now are used to explain the experiment. Recently there are also crystal plasticity model to explain and predict the size effect of FCC and BCC.By this time, there have been many models such as CS, SG, MSG ,CMSG.In crystal plasticity ,there have benn models raised by A.Arsenlis, Evers, A.Ma, Gurtin, Yefimov...
So,I want to ask ,are all these model to be the final model in Micro-Materials.If not ,what model can we develop ? What need we do if we want to establish a new model?May be we need to explain these phenomenon from physics and the micro-structure of the material. Maybe ,we need more knowledge of dislocation and other default of materials.But how these deault affect the constitutive models of the Microscale is a big question, How to come through these difficulties.
As I find ,if we have established the new model ,when we calculate the behavior of the material through the moedl, we can't use the FE software directly. we need to use the user defined material/element subroutine of the commercial FE code such as Abaqus or Marc.
So, I want to ask ,is it difficult to write the code of user subroutine. what kind of help can I meet from the book(list me a booklist or good paper) and websit ,or directly from your sincere advice.
I am a student just gradute as bachelor in china. So please give me some advice.
At the end ,I will be sorry for my poor english expression wasting your time.