Challenges in Mechanics of Time-Dependent Materials, Volume 2 of the Proceedings of the 2015SEM Annual Conference& Exposition on Experimental and Applied Mechanics, the second volume of nine from the Conference, brings together contributions to this important area of research and engineering.  The collection presents early findings and case studies on fundamental and applied aspects of Experimental Mechanics, including papers in the following general technical research areas: Time-dependence in Metallic Materials Rate and Time Effects Additive Manufacturing General Materials Response.