Method for controlling fatigue life of forged aluminum alloy hub

Abstract

The invention discloses a method for controlling the fatigue life of a forged aluminum alloy hub, and belongs to the technical field of automobile hub manufacturing. The method is characterized by comprising the following steps: 1) under the conditions that the action of other external forces on a hub is not considered and the loading of a load spectrum is constant, the fatigue life of the hub is controlled by controlling an applied load according to real stress and controlling the amplitude of the real stress and a constant load ratio; and 2) according to fatigue simulation of the forged aluminum alloy hub, directly determining the relationship among the real stress amplitude delta sigma, the load ratio R and the fatigue life N. The method has the advantages that the fatigue life of the forged aluminum alloy hub can be controlled by controlling the actual stress amplitude and the application of the load ratio, the fatigue life is calculated according to the actual stress amplitude and the load ratio, the fatigue life of the forged aluminum alloy hub is accurately controlled, and the anti-fatigue performance of the forged aluminum alloy hub is effectively controlled.

Description

Technical Field

[0001] This invention belongs to the field of automotive wheel manufacturing technology, specifically relating to a method for controlling the fatigue life of forged aluminum alloy wheels. Background Technology

[0002] The application of forged aluminum alloys in automobile wheels is already widespread. Aluminum alloys can meet the needs of lightweight vehicle development while ensuring a certain degree of stability during operation. Meanwhile, the fatigue life of forged aluminum alloys in wheel applications has received considerable attention, with researchers conducting in-depth studies on controlling the fatigue life of automobile wheels during operation. Forged aluminum alloy wheels are subjected to forces from various directions during driving, which can be broadly categorized as radial and bending loads. Increased loads significantly affect the fatigue life of automobile wheel hubs.

[0003] Controlling radial and bending loads is crucial for enhancing the fatigue life of forged aluminum alloy wheels. Since the load varies according to the actual stress experienced by the wheel hub, combining the actual stress amplitude and load ratio with the wheel hub's fatigue life allows for a simple and quick determination of the relationship between fatigue life and these factors. This method optimizes areas of the wheel hub with high actual stress during fatigue testing of forged aluminum alloy wheels, controlling the fatigue life of the wheel hub during operation and enhancing the safety and stability of the wheel. Furthermore, based on the effects of actual stress and load ratio on the wheel hub, the geometry of the initial wheel hub model can be optimized in detail to obtain optimal wheel hub model parameters. This significantly reduces experimental costs, improves the development and application of new wheel hubs, and provides a scientific and reliable method for controlling the fatigue life of forged aluminum alloy wheels. Summary of the Invention

[0004] The present invention provides a method for controlling the fatigue life of forged aluminum alloy wheel hubs, which can effectively solve the shortcomings of the existing technology.

[0005] The objective of this invention is achieved by comprising the following steps: (1) Forged aluminum alloy wheel hub life control: without considering the effect of other external forces on the wheel hub, and under the condition that the loading of the forged aluminum alloy load spectrum is constant, the fatigue life test of the forged aluminum alloy wheel hub is based on the load applied by controlling the actual stress. By controlling the actual stress amplitude and the constant load ratio to control the fatigue life, the relationship between the actual stress amplitude and the fatigue life is directly designed. (2) Based on the fatigue life simulation of forged aluminum alloy wheel hubs, the specific load is specified, and the actual stress amplitude Δσ and load ratio R and the maximum actual stress σ are determined. max Minimum true stress σ min The relation is: Δσ=σ max -σmin (1) R=σ min / σ max (2) (3) The fatigue life of forged aluminum alloy wheels is controlled by the actual stress amplitude and load ratio. The design formulas for the actual stress amplitude Δσ and the fatigue life N of forged aluminum alloy wheels can be determined: N=exp(1.47731+0.10338×Δσ-1.984×10 -4 ×Δσ 2 (3) (4) The forged aluminum alloy wheel hub material is 6061; the constant load ratio is -1.3.

[0006] According to the method for controlling the fatigue life of a forged aluminum alloy wheel hub, the fatigue life N of the wheel hub can also be obtained from the following table.

[0007] Table of fatigue life, maximum stress, and minimum stress of forged aluminum alloy wheels Maximum stress σmax / MPa 166.2 163.1 147.9 146.8 132.2 122.2 109.2 Minimum stress σmin / MPa -216.06 -212.03 -192.27 -190.84 -171.86 -158.86 -141.96 Fatigue life N / number of cycles 163505 228411 878616 950535 2123253 2844049 3038552 Advantages and positive effects of this invention: In the finite element simulation of fatigue life of forged aluminum alloy wheels, without considering the effects of other external forces on the wheel hub, and under the condition that the load spectrum of the forged aluminum alloy is constant, the maximum true stress σ is obtained. max Minimum true stress σ min The relationship between the true stress amplitude Δσ, the constant load ratio R, and the fatigue life N was determined. By controlling the true stress amplitude and load ratio, the fatigue life of forged aluminum alloy wheels can be effectively controlled. Given a fixed material and applied load for the forged aluminum alloy wheel, its fatigue life can be calculated efficiently and accurately. With a constant load ratio, the fatigue life can be controlled by varying the true stress amplitude, improving the control over the wheel's fatigue life during testing and providing a stable method for controlling the fatigue life of forged aluminum alloy wheels. Attached Figure Description

[0008] Figure 1 This is a graph showing the actual stress amplitude of a forged aluminum alloy wheel hub.

[0009] Figure 2 Flowchart for fatigue life control of forged aluminum alloy wheel hubs. Detailed Implementation

[0010] The method for controlling the fatigue life of forged aluminum alloy wheel hubs according to the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0011] Example 1 like Figure 1As shown in the actual stress amplitude curve, the parameters for the forged aluminum alloy wheel hub in this embodiment are set as follows: maximum stress σ max =166.2MPa, minimum stress σ min =-216.06MPa, constant load ratio set to -1.3, the design steps for radial fatigue life control of its forged aluminum alloy wheel hub are: A finite element simulation of the fatigue life of forged aluminum alloy wheel hubs was established. Without considering the effects of other external forces on the wheel hubs and under the condition that the load spectrum of forged aluminum alloy is constant, the fatigue life test of forged aluminum alloy wheel hubs was based on the load applied by true stress control. By controlling the true stress amplitude and constant load ratio, the fatigue life was controlled, and the relationship between the true stress amplitude, constant load ratio and fatigue life was directly designed. Based on fatigue life simulation of forged aluminum alloy wheel hubs, by applying a load to the wheel hub, the actual stress amplitude Δσ and load ratio R are obtained as follows: Δσ=σ max -σ min =382.26MPa (1) R=σ min / σ max =-1.3 (2) The fatigue life of forged aluminum alloy wheels is controlled by the actual stress amplitude and load ratio. Therefore, the fatigue life N can be calculated by the relationship between the actual stress amplitude Δσ, the load ratio R, and the fatigue life N of the forged aluminum alloy wheel. N=exp(1.47731+0.10338×382.26-1.984×10 -4 ×382.26 2 =163505 (3) When the actual stress amplitude Δσ = 382.26 MPa and the load ratio R = -1.3, the fatigue life N of the forged aluminum alloy wheel hub is calculated to be N = 163505. Reducing the actual stress amplitude while keeping the load ratio constant can increase the fatigue life of the wheel hub. Therefore, the fatigue life of the wheel hub can be controlled by changing the magnitude of the actual stress amplitude.

[0012] Example 2 like Figure 1 As shown in the actual stress amplitude curve, the parameters for the forged aluminum alloy wheel hub in this embodiment are set as follows: maximum stress σ max =146.8MPa, minimum stress σ min =-190.84MPa, constant load ratio set to -1.3, the design steps for radial fatigue life control of its forged aluminum alloy wheel hub are: A finite element simulation of the fatigue life of forged aluminum alloy wheel hubs was established. Without considering the effects of other external forces on the wheel hubs and under the condition that the load spectrum of forged aluminum alloy is constant, the fatigue life test of forged aluminum alloy wheel hubs was based on the load applied by true stress control. By controlling the true stress amplitude and constant load ratio, the fatigue life was controlled, and the relationship between the true stress amplitude, constant load ratio and fatigue life was directly designed. Based on fatigue life simulation of forged aluminum alloy wheel hubs, by applying a load to the wheel hub, the actual stress amplitude Δσ and load ratio R are obtained as follows: Δσ=σ max -σ min =337.64MPa (1) R=σ min / σ max =-1.3 (2) The fatigue life of forged aluminum alloy wheels is controlled by the actual stress amplitude and load ratio. Therefore, the fatigue life N can be calculated by the relationship between the actual stress amplitude Δσ, the load ratio R, and the fatigue life N of the forged aluminum alloy wheel. N=exp(1.47731+0.10338×337.64-1.984×10 -4 ×337.64 2 =950535 (3) With a true stress amplitude Δσ = 337.64 MPa and a load ratio R = -1.3, the fatigue life N of the forged aluminum alloy wheel hub is calculated to be N = 950535. Reducing the true stress amplitude while keeping the load ratio constant increases the wheel hub fatigue life. Therefore, the fatigue life of the wheel hub can be controlled by changing the magnitude of the true stress amplitude. Example 3 like Figure 1 As shown in the actual stress amplitude curve, the parameters for the forged aluminum alloy wheel hub in this embodiment are set as follows: maximum stress σ max =109.2MPa, minimum stress σ min =141.96MPa, constant load ratio set to -1.3, the design steps for radial fatigue life control of its forged aluminum alloy wheel hub are: A finite element simulation of the fatigue life of forged aluminum alloy wheel hubs was established. Without considering the effects of other external forces on the wheel hubs and under the condition that the load spectrum of forged aluminum alloy is constant, the fatigue life test of forged aluminum alloy wheel hubs was based on the load applied by true stress control. By controlling the true stress amplitude and constant load ratio, the fatigue life was controlled, and the relationship between the true stress amplitude, constant load ratio and fatigue life was directly designed. Based on fatigue life simulation of forged aluminum alloy wheel hubs, by applying a load to the wheel hub, the actual stress amplitude Δσ and load ratio R are obtained as follows: Δσ=σ max -σmin =251.16MPa (1) R=σ min / σ max =-1.3 (2) The fatigue life of forged aluminum alloy wheels is controlled by the actual stress amplitude and load ratio. Therefore, the fatigue life N can be calculated by the relationship between the actual stress amplitude Δσ, the load ratio R, and the fatigue life N of the forged aluminum alloy wheel. N=exp(1.47731+0.10338×251.16-1.984×10 -4 ×251.16 2 =3038552 (3) With a true stress amplitude Δσ = 251.16 MPa and a load ratio R = -1.3, the fatigue life N of the forged aluminum alloy wheel hub is calculated to be N = 3038552. Reducing the true stress amplitude while keeping the load ratio constant increases the wheel hub fatigue life. Therefore, the fatigue life of the wheel hub can be controlled by changing the magnitude of the true stress amplitude.

Claims

1. A method for controlling the fatigue life of forged aluminum alloy wheel hubs, characterized in that... Follow these steps to achieve the following: (1) Forged aluminum alloy wheel hub life control: without considering the effect of other external forces on the wheel hub, and under the condition that the loading of the forged aluminum alloy load spectrum is constant, the fatigue life test of the forged aluminum alloy wheel hub is based on the load applied by controlling the actual stress. By controlling the actual stress amplitude and the constant load ratio to control the fatigue life, the relationship between the actual stress amplitude and the fatigue life is directly designed. (2) Based on the fatigue life simulation of forged aluminum alloy wheel hubs, the specific load is specified, and the actual stress amplitude Δ is determined. σ and load ratio R With maximum true stress σ max Minimum true stress σ min The relation is: D σ=σ max - σ min (1) R = σ min / σ max （2） (3) The fatigue life of forged aluminum alloy wheels is controlled by the actual stress amplitude and the load ratio, and the actual stress amplitude Δ can be determined. σ Fatigue life of forged aluminum alloy wheels N Design formula: N =exp(1.47731+0.10338×Δ σ -1.984×10 -4 ×Δ σ 2 ) (3) (4) The forged aluminum alloy wheel hub material is 6061; the constant load ratio is -1.

3.

2. The method for controlling the fatigue life of a forged aluminum alloy wheel hub according to claim 1, characterized in that, Wheel hub fatigue life N You can also find this information in the table below.

3. Data table of fatigue life, maximum stress, and minimum stress for forged aluminum alloy wheels.

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