塑性・脆性めねじの引張試験および強度解析

抄録

In this study, tensile tests were conducted for the fastener consisting of aluminum (or bakelite) female thread and chromoly male thread. The results showed that the maximum loads in the tensile tests were proportional to the nominal diameter d, fit length l and the shear strength τ_u of the female thread material. Therefore, it was found that if dimensionless female thread strength K_s F_max/(τ_uπ dl) was measured in the certain (d, l), the maximum loads F_max at any (d, l) could be accurately predicted. In addition, strength analysis of female/male fasteners were performed using finite element method. As a result, the analysis maximum load F_max became higher as the fitting length l and the nominal diameter d were larger, as in the experiment. However, the analysis was stopped halfway due to an error, and the analysis result of the maximum load was smaller than the experiment, and it was found that the prediction was limited. To get accurate results, it is necessary to eliminate the analysis error and to consider the roundness of the thread valley of the analysis model.