Engineering Transactions, 65, 2, pp. 289–305, 2017

Effects of Hole-Perpendicularity Error on Joint Stiffness of Single-Lap Double-Bolt Composite Joints

Xueshu LIU
Dalian University of Technology

Yuxing YANG
Dalian University of Technology

Hang GAO
Dalian University of Technology

Yongjie BAO
Dalian University of Technology

Rupeng LI
Shanghai Aircraft Manufacturing Co. Ltd.

Shanghai Aircraft Manufacturing Co. Ltd.

To investigate the influence of hole-perpendicularity error on stiffness of single-lap double-bolt composite joints, a finite element model was first created and validated by using the analogical mass-spring based model proposed by McCarthy et al. The model was then modified by introducing hole-perpendicularity error, with which the influences of holeperpendicularity error, which is represented by hole-titling angle, hole-tilting direction, and bolt torque on the joint stiffness are studied. It is found that the hole-tilting direction causes the joint stiffness to either increase or decrease, which depends on the relation between the hole-tilting direction and the loading orientation. In addition, the hole-tilting angle strengthens the influence of hole-tilting direction and the bolt torque plays the most important role among the three factors in affecting the joint stiffness.
Keywords: bolted joints; joint stiffness; hole-perpendicularity error; bolt torque
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