Fiber reinforced polymers (FRP) materials have tremendous application in different sectors because of their outstanding specific strength, stiffness and corrosion. They are however, anisotropic making them difficult to design joints, particularly when mechanical fixation is made through holes drilled in them. In this work, the hole size and fasteners are studied and their effects on the functionality of FRP composite joints are examined. Stress concentration in composite structure is bound to occur through holes, and the resulting stress is high at the boundaries of the holes. Another important design consideration is the ratio of plate width to hole diameter (W/D) and ratio of edge distance to hole diameter (E/D) which affects the distribution of the load and mode of failure. The bigger holes are likely to alter the failure mode of bearing or shear-out to net-tension failures. Simulations with the Finite element demonstrate that the stress concentration factors are exponentially dependent on the diameter of holes particularly those with ineffective laminate thickness and sequences. Traditional metallic fasteners bring about a disconnect between the stiffness of the part and the structural component with stress concentration and matrix compaction. Other fasteners are thermoplastic composite or fiber-reinforced polymer which reduce such problems. The second factor to take into consideration is the bolt clamping torque, which is more the greater the torque the more the frictional load transfer is improved, however it can lead to delamination. The pulp composite fasteners are smart and have embedded sensors that will allow real-time structural health monitoring. Stress concentration can be minimized by use of reinforcement techniques like bonded inserts, titanium foil reinforcements and fiber steering, as well as increasing damage tolerance about holes. Knowledge of the nature of association between geometry, material anisotropy, and fastener design would play a significant role in creating lightweight, damage-tolerant joint systems made of FRP in different industries.

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Influence of Hole Size and Fasteners in Fiber Reinforced Polymer Composite Joints

  • Amrinder Mehta,
  • Jashanpreet Singh,
  • Brijesh Prasad,
  • Hitesh Vasudev

摘要

Fiber reinforced polymers (FRP) materials have tremendous application in different sectors because of their outstanding specific strength, stiffness and corrosion. They are however, anisotropic making them difficult to design joints, particularly when mechanical fixation is made through holes drilled in them. In this work, the hole size and fasteners are studied and their effects on the functionality of FRP composite joints are examined. Stress concentration in composite structure is bound to occur through holes, and the resulting stress is high at the boundaries of the holes. Another important design consideration is the ratio of plate width to hole diameter (W/D) and ratio of edge distance to hole diameter (E/D) which affects the distribution of the load and mode of failure. The bigger holes are likely to alter the failure mode of bearing or shear-out to net-tension failures. Simulations with the Finite element demonstrate that the stress concentration factors are exponentially dependent on the diameter of holes particularly those with ineffective laminate thickness and sequences. Traditional metallic fasteners bring about a disconnect between the stiffness of the part and the structural component with stress concentration and matrix compaction. Other fasteners are thermoplastic composite or fiber-reinforced polymer which reduce such problems. The second factor to take into consideration is the bolt clamping torque, which is more the greater the torque the more the frictional load transfer is improved, however it can lead to delamination. The pulp composite fasteners are smart and have embedded sensors that will allow real-time structural health monitoring. Stress concentration can be minimized by use of reinforcement techniques like bonded inserts, titanium foil reinforcements and fiber steering, as well as increasing damage tolerance about holes. Knowledge of the nature of association between geometry, material anisotropy, and fastener design would play a significant role in creating lightweight, damage-tolerant joint systems made of FRP in different industries.