Text this: Formulation of constitutive relations based on indentation test

  _____     _____      _____   __   __    ____    
 |__  //   |  ___||   / ___//  \ \\/ //  |  _ \\  
   / //    | ||__     \___ \\   \ ` //   | |_| || 
  / //__   | ||__     /    //    | ||    | .  //  
 /_____||  |_____||  /____//     |_||    |_|\_\\  
 `-----`   `-----`  `-----`      `-`'    `-` --`