A Numerical Study of the effect of Bolt Thread Geometry on the Load Distribution of Continuous Threads

Abstract

Load distribution has been studied extensively for ISO thread, but the load distribution on power screw threads, specifically ACME and Square threads, has not been studied yet. In this article, axisymmetric two-dimensional and three-dimensional Finite Element Analysis have been conducted on bolts with different sizes and thread geometries to examine the effect of the thread geometry on the load distribution. The thread geometries were studied with ISO, ACME, and Square threads attention. The sizes used are from the ISO coarse series. In order to investigate on the effect of bolt thread geometry, several simulations have been performed. The two-dimensional simulation results have shown reliable performance in determining the load distribution behaviour when the thread geometry is modified. Moreover, the results agreed with the three-dimensional simulation outcomes regarding the load distribution behaviour when the size is varied.

Influence of Symmetry of Tightened Parts on the Force in a Bolted Joint

“…Hetenyi [15], Jehle [7] (p. 91) and Maduschka [16] dealt with other types of threads (e.g., Whitworth thread). Relatively recently, this problem was also solved using numerical methods such as FEM [17]. The results from experimental measurements and calculations are relatively together.…”

“…An important section in the development of the computational model was also its simplification. For this purpose, the information presented in [15][16][17], which describes the load and stress behavior across the contact threaded region of the bolt, was very useful. Other references were crucial in terms of the design and execution of the experiment, e.g., basic information [18] or advanced information from N. Fric [19] about the limitations of strain gauging when using internal strain gauges in bolts.…”