COMPARISON OF THE EFFECT OF QUASI STATIC AND DYNAMIC LOADING ON THE FAILURE STRAINS OF CFRP/GFRP SINGLE-LAP COMPOSITE JOINTS

Abstract

This research provides an insight into the effect of quasi-static and dynamic loading coupled with varying degrees of torque in Single-Lap Composite Joints (SLJs). This study highlights the importance of addressing critical issues of strength reduction in SLJs in composite materials such as carbon and glass fiber reinforced composites. SLJs are crucial across various industries, including aerospace, marine and automotive engineering where their performance is vital. Understanding the behavior of these joints under static and dynamic loading conditions, particularly under varying strain rates is essential. Tightening torque of bolt is also a significant factor effecting the performance of SLJs under tensile loading. The primary research objective is to investigate the influence of different levels of bolt torque against varying strain rates on the performance of GFRP and carbon fiber joints. Although the research is ongoing, literature review has revealed the impact of strain rate on failure modes and stress distribution within these joints. Samples of SLJs with GFRP and Carbon fiber composite joints have been fabricated following extensive literature review. Results show that higher strain rates are associated with progressively lower failure strains. The increased torque levels for constant strain rates indicate a 3% increase in the ultimate strength of SLJ. However, the failure strains show a significant decline as torque level increases. The findings will significantly contribute to enhancing the safety and reliability of composite structures. The work aligns with industry objectives of achieving superior performance and flexibility in dynamic environments, where composite joints find integral usage.