Design and Static Load Analysis Comparing Steel, Grey Cast Iron and Titanium Alloy as Materials for Breech Hinged Lugs in Recoil Weapons

E Chaturvedi,R K Dwivedi

doi:10.3849/aimt.01255

Abstract

This design innovation work is related to design validation of short recoil weapons mechanism’s critical components in context of upper receivers. It explains a new mechanism for locking and unlocking of bolt with the breech and subsequent advantageous design changes in the bolt’s construction. This design intends to build a new platform for a short recoil weapon chambered in 5.56×45 NATO ammunition which promises competency with its existing counter parts of the same domain, but exhibiting exceptionally improved reliability due to elimination of interdependence of reciprocating cycles of barrel and bolt assemblies. This work involves the design of the whole functioning system using Solidworks 2015 version and a static structural analysis to compare and choose the most suitable material among commonly used ones: steel AISI 4340, grey cast iron and titanium alloy Ti-6Al-4V, for locking lugs, being critical pair of components, using ANSYS 14.5. Results showed that titanium alloy was the most suitable material for the strength purpose. It is to be noted that this system may not only be utilized for assault rifles, but also for sub-machine guns, machine gun variants and even in handguns.

Highlights

Compared to the most frequently used gas-operated action, the short recoil system has a universal advantage against the fouling of internal parts due to carbon deposits in the long-term use
The results prove that the chosen dimensions of the lugs were sufficient to bear the generated loads and allowing the mechanism to function without failure
It is clear that grey CI failed quite badly under the simulated loads

Summary

Introduction

Compared to the most frequently used gas-operated action, the short recoil system has a universal advantage against the fouling of internal parts due to carbon deposits in the long-term use. The problem of fouling can be tackled very well by recoil or inertia. If the system fails to do so, the gun jams. It is this second stated problem that this invention intends to tackle. In concern to this invention, efforts have been made to transform the breech locking system to a much simplified form. The so called intricacies in short recoil action can be resolved, making the weapon much more user-friendly, reliable, and adaptable to adverse conditions

Methods

Results

Conclusion