Experimental Fatigue Life Investigation on a Standard PMMA Compact Tension Specimen Equipped by the Lock Technique

  • A. Kamali
  • M. RezaeizadehEmail author
  • E. Jomehzadeh
Technical Article---Peer-Reviewed


The lock technique is a method to decrease crack growth by putting a lock on the crack which the focus of this study is to experimentally characterize the influence of the lock technique on crack growth behavior and life assessment. In this study, polymethyl-methacrylate rectangular standard compact tension plates were used as the test samples. Three different edge crack and lock configurations were tested for total six samples in order to assess fatigue life and fracture resistance, and experiments were conducted using a high-frequency fatigue test machine that applies cyclic tension–compression loads to the samples. In this study, effects of varying lock and hole geometry on crack initiation and propagations are investigated. Detecting of the crack initiation life and assessing crack propagation life from crack initiation until fracture moment are investigated. The experimental results show that the crack growth life is reduced in the lockless standard cracked specimen compared to the locked samples, and similarly, fracture strength in specimens equipped with the lock is more in comparison with the lockless specimens.


Fracture mechanics Fatigue crack growth Metal stitching Fracture strength 



This research work was accomplished by financial support of PSDF CO., under Contract No. 9869. Special thanks are due to the generous helps of R&D unit of PSDF CO.; the authors would like to gratefully appreciate M. Mirzazadeh for his help to this study.


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© ASM International 2019

Authors and Affiliations

  1. 1.Faculty of Mechanical and Material EngineeringGraduate University of Advanced TechnologyKermanIran

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