A Design Method for Improving the Bearing Capacity of Shaft-hole Connection Structure

Abstract

The invention discloses a design method for improving shaft hole connection structure bearing capacity. The design method for improving the shaft hole connection structure bearing capacity comprises the following steps: step (1) a contact stress analysis model and a theoretical calculation method of the shaft hole connection structure are established; step (2) a contact optimization model is established and calculation is designed; step (3) a theoretical solution is compared with a finite element solution error. Traditional shaft hole connection structures do not consider the phenomenon of bigger contact stress existing in shaft hole matching area, so that bearing capacity is not high. The design method for improving the shaft hole connection structure bearing capacity starts from factors influencing the contact stress, increases the number of initial contact points, and optimizes contact surface curvature through changing hole interface curved surface shape and optimizing the curved surface parameters, so that shaft hole contact order extends gradually from two sides to the middle part, contact area is increased, the maximum contact stress is reduced, and bearing capacity is improved. The design method for improving the shaft hole connection structure bearing capacity is unique in method, clearly in thought, feasible in operation, high in universal applicability, and is capable of being popularized and applied in other connection structure designs.

Description

technical field [0001] The invention belongs to the technical field of mechanical connection structure design, and in particular relates to a design method for improving the bearing capacity of a shaft-hole connection structure. Background technique [0002] Shaft-hole connections are widely used in structural design and are important force-transmitting components in engineering structures, such as bolts and lugs. Due to its own structural characteristics, the external force is often directly applied to the edge of the hole through the shaft when bearing the force, and a high-stress contact area will appear on the edge of the hole due to extrusion, resulting in a low bearing capacity, and under the action of dynamic load, It is easy to cause damage to the contact of local points. Therefore, the contact stress in the area around the hole often becomes a key part that affects the bearing capacity of the entire connection structure. [0003] Under normal circumstances, accord...

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Problems solved by technology

This design method does not take into account the high stress phenomenon that exists in the contact area when the shaft and the hole are matched, causing the edge of the hole to easily reach its strength limit, so the structural bearing capacity is not high

Moreover, when considering the contact problem in traditional design, the calculation and analysis are generally carried out according to the Hertz theory. This theoretical method has a large error in the calculation of coordinated contact, and is not suitable for the analysis and calculation of the shaft-hole connection structure.

[0005] For the above problems, no effective solutions have been proposed so far

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