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The reliability of mechanical spring is essential to ensure the arm does works as intended. Thus, it is important to understand the behavior of spring in arm to increase the reliability of arm and improve defence technology. This paper presents the simulation on reliability of springs in three small arms, namely weapon X, weapon Y and weapon Z. The springs that are used in these weapons were modelled in SOLIDWORK and the properties such as shear stress, von Mises stress and potential for failure were predicted based on the simulation results. The simulation was extended to find alternative materials to fabricate the firing spring of weapon Z. It was found that the stainless steel AISI 304 yielded the lowest percentage of potential for failure of 8.5%. Future work is on the testing of spring reliability under actual operating conditions since it is essential to get a data on the fatigue failure or failure due to wear.

Investigation on spring characteristics for small arms