Numerical Analysis and Test Study of Bolted Structure

The theoretical value of bolt pre-tightening torque coefficient is typically 0.2 on load boundary condition simulations. A set of measuring setup has been designed in present study. Through direct measurement and electric measurement, a torque coefficient of 0.15 has been measured. The effects of pre-tightening torque coefficient on bolt stress field are studied numerically. Results show that the coefficient has significant effect on bolt stress fields and relatively conservative results will be achieved if a theoretical value of 0.2 is chosen. Studies on stresses around hole-edge and comparisons with test values show that simulated results of sigma(x), and sigma(y) agree well with test data and the relative errors are no more than 15%.