The process of microstructure failure or the growth of cracks in structures subjected to repetitive loading and unloading. MCQ 08:03 Biomechanics The process of microstructure failure or the growth of cracks in structures subjected to repetitive loading and unloading. a. hysteresis b. creep c. relaxation d. fatigue Answer: d. fatigue Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+