Atomic and Molecular Structure
http://chemistry.about.com/od/atomicmolecularstructure/Atomic_Molecular_Structure.htm
Thorough overview of atomic and molecular structure, organised into sub-topics with quizzes on each area
Material Structure
http://www.ndt-ed.org/EducationResources/CommunityCollege/Materials/Structure/introduction.htm
Comprehensive learning source for structure of materials
Stress and its effect on materials
http://www.ami.ac.uk/courses/topics/0124_seom/index.html
Explains different types of material stresses and fatigues with real photos to show the cracks, etc in the element
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