Once you know how forces act on an object (Mechanics), you need to know if the object will break under that force. This is the study of stress, strain, and deformation.
Materials Science and Engineering: An Introduction (Callister) basic mechanical engineering books
by Richard Budynas: A foundational text for learning how to design machine components like gears, bearings, and shafts. 2. Foundational Subjects (Statics, Dynamics, and Materials) Once you know how forces act on an