en Review Paper Review Paper Residual stress measurement is of utmost importance for the safety and reliability of engineering components and has been an active area of scientific research. Relaxation techniques such as hole drilling, slitting and ring core method are widely applied semi destructive techniques for residual stress measurements in polymer composites. This article reviews the recent literature on the measurement of residual stress in polymer composite by employing the above-mentioned relaxation techniques. This article summarizes the categories of residual stresses, causes of formation, techniques of measurements and also briefly outlines the chronological developments of the Hole drilling and slitting method. The article also provides a comparative summary of these relaxation methods. Residual stresses,Hole Drilling Method,Slitting Method,Ring core Method 1 15 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-3340-1&slc_lang=en&sid=1 Umarfarooq Maktedar Abdulkhadar umarfarooq.ma@gmail.com 1800319475328460014714 1800319475328460014714 No Department of Mechanical Engineering, SDM College of Engineering & Technology, Dharwad- 58002 and affiliated to Visvesvaraya Technological University, Belagavi, Karnataka, India. Patil Somalinganagouda ShivakumarGouda ursshivu@gmail.com 1800319475328460014715 1800319475328460014715 Yes Department of Mechanical Engineering, SDM College of Engineering & Technology, Dharwad- 58002 and affiliated to Visvesvaraya Technological University, Belagavi, Karnataka, India. Gonal Basavaraja Veeresh Kumar veeru232@gmail.com 1800319475328460014716 1800319475328460014716 No Department of Mechanical Engineering, National Institute of Technology-Andhra Pradesh, Tadepalligudem, Andhra Pradesh - 534102, India Krishnaraja Govinda Kodancha krishnaraja@bvb.edu 1800319475328460014717 1800319475328460014717 No School of Mechanical Engineering, KLE Technological University, Vidyanagar, Hubballi-580031, India