Structural materials used in modern engineering applications are more than ever today subjected to extreme loading and environmental conditions. The development of large strains either during manufacturing or under operational conditions often leads to non-trivial deformation modes, such as localisations and microfractures, which are precursors to catastrophic failure. Besides geometrical factors, these events have their roots to the material microstructure. Therefore, the accurate description of the long-term mechanical behaviour of these materials is still a challenge.