CN-122007637-A - Laser shock peening process optimization method and system based on interface micro-motion regulation and control

CN122007637ACN 122007637 ACN122007637 ACN 122007637ACN-122007637-A

Abstract

The invention relates to the technical field of aeroengines and provides a laser shock strengthening process optimization method and system based on interface micro-regulation, wherein the method comprises the steps of carrying out laser shock strengthening treatment on a contact surface of a first component, assembling the first component after strengthening treatment and a second component to form a micro-contact pair, carrying out micro-fatigue test on the micro-contact pair to obtain displacement field data of a contact area, determining the evolution rule of sliding/adhesion characteristics of the contact surface based on the displacement field data, evaluating the influence of the laser shock strengthening treatment on the fatigue performance of the micro-contact pair, optimizing the parameters of the laser shock strengthening process, and ensuring the process optimization direction to inhibit harmful interface sliding by establishing a closed-loop optimization path between the laser shock strengthening process parameters-interface dynamic behavior-micro-fatigue performance, so that the adjustment of the process parameters can be dependent, and further accurate regulation and reliable improvement on the micro-fatigue performance can be realized.

Inventors

SU YUE
DING YUNPENG
LIU XINGFA

Assignees

西北工业大学
西北工业大学深圳研究院

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (10)

1. The laser shock peening process optimization method based on interface micro-motion regulation is characterized by comprising the following steps: Performing laser shock peening on a contact surface of a first component made of a turbine disk material; assembling the first component subjected to the laser shock peening treatment with a second component made of a turbine blade material to form a micro-contact pair; Applying a cyclic load to the micro-contact pair to perform a micro-fatigue test, and acquiring displacement field data of a contact area based on a digital image correlation technique; determining an evolution rule of the sliding/adhering characteristics of the first component and the second component on the contact surface based on the displacement field data; based on the evolution law of the slippage/adhesion characteristics, evaluating the influence of the laser shock peening on the fatigue performance of the micro contact pair to obtain an evaluation result; and optimizing parameters of the laser shock peening process based on the evaluation result.
2. The method of claim 1, wherein prior to performing the laser shock peening process on the contact surface of the first member, the method further comprises: determining Xu Gongniu elastic limit of the turbine disk material; obtaining a laser energy density threshold based on the Xu Gongniu elastic limit and according to an impact peak value pressure model; an initial laser energy density for the laser shock peening process is determined based on the laser energy density threshold, the initial laser energy density being greater than or equal to the laser energy density threshold.
3. The method for optimizing a laser shock peening process based on interface fine tuning according to claim 2, wherein said obtaining a laser energy density threshold based on said Xu Gongniu elastic limit and based on a shock peak pressure model comprises: determining a relationship model between laser-induced impact pressure and laser energy density; the laser energy density threshold is determined based on the relationship model with a pressure of the laser shock wave greater than the Xu Gongniu elastic limit as a constraint.
4. The method for optimizing laser shock peening process based on interface fine tuning according to claim 1, wherein in the step of performing laser shock peening on the contact surface of said first member, an absorption layer and a confinement layer are disposed on the contact surface, wherein said absorption layer is configured to absorb energy under the action of laser light to form plasma and protect the contact surface from laser ablation, and said confinement layer is configured to confine said plasma to form shock wave pressure acting on the contact surface.
5. The method of claim 1, wherein prior to performing the laser shock peening process on the contact surface of the first member, the method further comprises: Constructing a plurality of said second members having different predetermined crystallographic orientations; The optimizing parameters of the laser shock peening process based on the evaluation results includes: Comparing differences of evolution rules of the slippage/adhesion characteristics under different crystal orientations to obtain comparison results; And optimizing parameters of the laser shock peening process based on the comparison result and the evaluation result.
6. The method for optimizing a laser shock peening process based on interface fine tuning according to any one of claims 1 to 5, wherein said evaluating an influence of said laser shock peening process on said fine contact pair fatigue performance based on an evolution law of said slip/adhesion characteristics comprises: extracting at least one key evaluation parameter from the evolution law, wherein the key evaluation parameter comprises an initial relative slippage amplitude, a cycle time required for reaching a slippage steady state, a relative slippage mean value in the steady state and a distribution proportion of a slippage area along a contact surface; and comparing the extracted key evaluation parameters with preset corresponding threshold values or reference values, and quantitatively evaluating the effect of the laser shock peening treatment based on the comparison result.
7. The method for optimizing a laser shock peening process based on interface fine tuning according to claim 6, wherein said optimizing parameters of said laser shock peening process based on said evaluation result comprises: and when the evaluation result shows that the key evaluation parameters deviate from a preset target range, adjusting the process parameters of the laser shock peening treatment, wherein the process parameters comprise at least one of laser energy density, lap rate or shock times.
8. The method of optimizing a laser shock peening process based on interface fine tuning according to any one of claims 1 to 5, wherein said determining an evolution law of said slip/adhesion feature based on said displacement field data comprises: Determining a relative movement of the first member and the second member at a contact surface based on the displacement field data; Constructing a hysteresis curve between the relative motion and the tangential load based on the relative motion and the measured tangential load; based on the hysteresis curve, calculating the relative slippage of the contact surface; And obtaining an evolution rule of the sliding/adhering characteristic based on the change characteristic of the relative sliding quantity along with the cycle.
9. The laser shock peening process optimization method based on interface fine tuning according to claim 8, wherein said first member is a nickel-based powder superalloy, and said second member is a nickel-based single crystal superalloy.
10. The laser shock peening process optimizing system based on interface micro-motion regulation and control is characterized by comprising: The laser shock strengthening module is used for carrying out laser shock strengthening treatment on the contact surface of the first component made of the turbine disk material; The fretting fatigue test module is used for assembling the first component subjected to the laser shock strengthening treatment with the second component made of the turbine blade material to form a fretting contact pair; The acquisition module is used for applying a cyclic load to the micro-motion contact pair to perform micro-motion fatigue test and acquiring displacement field data of a contact area based on a digital image correlation technique; The determining module is used for determining an evolution rule of the sliding/adhesion characteristics of the first component and the second component on the contact surface based on the displacement field data; The evaluation module is used for evaluating the influence of the laser shock peening on the fatigue performance of the micro-contact pair based on the evolution rule of the slippage/adhesion characteristic to obtain an evaluation result; And the optimizing module is used for optimizing parameters of the laser shock peening process based on the evaluation result.

Description

Laser shock peening process optimization method and system based on interface micro-motion regulation and control Technical Field The invention relates to the technical field of aeroengines, in particular to a laser shock peening process optimization method and system based on interface micro-motion regulation and control. Background In aircraft engines, turbine blades are typically connected to a turbine disk by mortise and tenon structures. In the service process, the connecting structure bears huge centrifugal load generated by high temperature, high cycle vibration and rotation. The combined action of these loads inevitably results in a reciprocating relative motion, i.e., jog (Fretting), of the order of microns between the interface of the turbine disk and the blade dovetail. The fretting phenomenon is combined with contact stress on an interface, fatigue cracks are extremely easy to initiate at the edge of a contact area, and fretting fatigue (Fretting Fatigue) is finally caused to fail, so that the fretting phenomenon becomes one of key bottlenecks for limiting the service life and reliability of the whole engine. In order to improve the fatigue performance of critical load bearing members, laser shock peening (Laser Shock Peening, LSP) techniques are widely used. The technology utilizes pulse laser beams with high peak power to induce plasma shock waves, and introduces residual compression stress fields with high amplitude and large depth into the surface layer of the material. The residual compressive stress can effectively inhibit the initiation and the expansion of fatigue cracks, thereby remarkably prolonging the fatigue life of the component. The traditional laser shock peening process has significant limitations in formulation and evaluation. The optimization targets are usually focused on macroscopic mechanical property indexes of the single component after strengthening, such as surface hardness, the size and distribution of residual stress, surface roughness and the like. This evaluation method ignores fretting fatigue as a systematic failure behavior that occurs at the interface of two components in contact. While the laser shock peening introduces beneficial residual compressive stress, the hardness, roughness, and elastoplastic response of the material surface must be altered, which will affect the interface behavior of the contact pair during the jog. However, the optimal mechanical index of the individual components may adversely affect the fretting fatigue life of the entire connection structure, and may even reduce its life. Therefore, the prior art lacks an optimization method capable of associating laser shock peening with micro-contact interface behaviors, so that process formulation has blindness, and accurate prediction of micro-fatigue performance cannot be realized. Disclosure of Invention The invention provides a laser shock peening process optimization method and system based on interface micro-motion regulation and control, which are used for solving the defect that in the prior art, when a laser shock peening process is evaluated, the mechanical property index of a single component is concerned, the contact interface micro-motion behavior influence is ignored, and the process optimization has blindness. The invention provides a laser shock peening process optimization method based on interface micro-motion regulation, which comprises the following steps: Performing laser shock peening on a contact surface of a first component made of a turbine disk material; assembling the first component subjected to the laser shock peening treatment with a second component made of a turbine blade material to form a micro-contact pair; Applying a cyclic load to the micro-contact pair to perform a micro-fatigue test, and acquiring displacement field data of a contact area based on a digital image correlation technique; determining an evolution rule of the sliding/adhering characteristics of the first component and the second component on the contact surface based on the displacement field data; based on the evolution law of the slippage/adhesion characteristics, evaluating the influence of the laser shock peening on the fatigue performance of the micro contact pair to obtain an evaluation result; and optimizing parameters of the laser shock peening process based on the evaluation result. According to the laser shock peening process optimization method based on interface micro-motion regulation, before the laser shock peening treatment is performed on the contact surface of the first member, the method further comprises the following steps: determining Xu Gongniu elastic limit of the turbine disk material; obtaining a laser energy density threshold based on the Xu Gongniu elastic limit and according to an impact peak value pressure model; an initial laser energy density for the laser shock peening process is determined based on the laser energy density threshold, the initial laser energy de