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

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Text this: Stress waves in functionally gradient materials and its use for material characterization