Fatigue calculation method of car frame under effect of spatial rotation moment

Abstract

The invention relates to a fatigue solving method of a car frame under the effect of spatial rotation moments. The method comprises the following steps that: a finite element model of a car frame structure under a permanent load is built, and a static solving result under the permanent load is output according to the finite element model; a moment load is exerted on the car frame, and translational constraints in three directions (X, Y and Z) are exerted in positions of support legs; under the condition that the support counter force in the three directions (X, Y and Z) in the positions of the support legs does not generate a negative value, the static solving result of change loads only including the moment load is output, and the static solving result is loaded into a fatigue solving work condition; and then, according to the rotating sequence of the space moment load, the car frame material attribution, a material processing method and a fatigue solving method, the car frame is subjected to fatigue cycle solving, and the fatigue service life and the load cycle amplitude are output. The fatigue solving method has the beneficial effects that the permanent load and the spatial rotation moment load are processed in different steps, so the fatigue solving result of the car frame under the condition of coexistence of the spatial rotation moment and the permanent load is obtained.

Description

Technical field [0001] The invention relates to the technical field of machinery, in particular to a fatigue calculation method of a vehicle frame under the action of a spatial turning moment. Background technique [0002] Cars have become an indispensable means of transportation for the development of modern society, and they play an important role in people's daily lives. The automobile industry has become a pillar industry for the development of my country's national economy with its powerful industrial pulling effect. [0003] As the carrier substrate of the car, the frame is generally composed of two longitudinal beams and several beams. Most parts and assemblies of the car, such as the engine, transmission system, suspension, steering, cab, cargo box and related operating mechanisms, The position is fixed by the frame. The function of the frame is to support various parts connected to the car, and to withstand various loads from inside and outside the car. When a car is dr...

AI Technical Summary

Problems solved by technology

[0005] At present, there is no systematic and perfect method for calculating the fatigue of the frame of engineering vehicles, especially under the load with complex stress conditions, and for the coexistence of constant load and changing load, it is impossible to effectively solve the fatigue of the frame

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