Abstract
The connection concept of placing only two bolts in offset misalignment against the bending load along the wing span was used for an aerobatic airplane designed in Thailand as a KIT plane to minimize the impact of drilling numerous holes. This concept can deviate the force direction on the holes. The two suitable drilling positions should have the lowest resultant force and highest strength of fiber reinforcement structure. To investigate the strength of the fastener hole when the force deviated from the original orientation, specimens, made from twill weave carbon fiber-epoxy and laid up at ±45-degree orientation, were tested under bearing load according to ASTM D5961 standard. The experimental results revealed that the bearing strength of CFRP material decreases when the force deviation angle increases, so zero-angle deviation of the resultant force on the drilling hole is the most suitable orientation to absorb bolt bearing load. The most suitable pattern of two offset misalignment holes is the greatest horizontal distance at zero vertical distance when it was considered only the effect of the bearing strength and the deviation angle. Moreover, the failure pattern begins to deviate along the fiber orientation when the inclination angle increased.
Highlights
The parallel offset misalignment bolt joint is an interesting concept
It is applied to some KIT planes fixture such as Lancair Legacy (Figure 1) [1] and FURIO (Figure 2) [2]
Every structure is always weakened by drilling holes, especially composite structure which is composed of a fiber fabric and resin matrix
Summary
The parallel offset misalignment bolt joint is an interesting concept. It is applied to some KIT planes fixture such as Lancair Legacy (Figure 1) [1] and FURIO (Figure 2) [2]. The KIT plane concept allows customers of KIT planes or Experimental Light Sport Aircraft to assemble more than 50 percent of the overall aircraft components themselves. This facilitates delivery to buyers by separate parts, especially such large parts as the wing spar which is the focus of this paper. The minimum number of bolts is two, this is considered suitable and safe regarding the fabric structure and drilling holes and supporting the wing load.
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