Calculation method of gas-liquid-solid coupling for laser shock enhancement

A technology of laser shock strengthening and calculation method, which is applied in calculation, design optimization/simulation, and special data processing applications, etc. It can solve problems such as time-consuming, difficult optimization of laser shock strengthening process parameters, and a large amount of time-consuming and cost-intensive operations. Simple operation , Satisfy the amount of calculation and the effect of easy implementation

Active Publication Date: 2018-12-21
GUANGDONG UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The three-dimensional flat-topped Gaussian beam is a kind of laser with a uniform flat-top area in the spatial distribution of light energy. The shock strengthening process is affected by various variable factors due to its complex mechanism, which brings great benefits to the optimization of laser shock hardening process parameters. difficulty
In terms of finite element simulation, Braisted and Brockman first used the ABAQUS / Explicit+ABAQUS / Implicit method to simulate laser shock strengthening. Moreover, for different process parameters (spot radius, overlap rate, impact route, etc.), it is necessary to establish multiple analysis models, so there is an urgent need for a gas-liquid-solid coupling simulation method for laser shock strengthening to simulate laser shock strengthening. analyze
[0004] At present, the existing technology still has the following deficiencies: the existing experimental technology requires a lot of time and money to study the laser-induced forward transfer, and the finite element simulation method is not only time-consuming but also needs to be continuously displayed for each spot when it is strengthened by laser shock. The results of the analysis are brought into the implicit analysis, and multiple analysis models need to be established for different process parameters (spot radius, lap rate, impact route, etc.)

Method used

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  • Calculation method of gas-liquid-solid coupling for laser shock enhancement
  • Calculation method of gas-liquid-solid coupling for laser shock enhancement
  • Calculation method of gas-liquid-solid coupling for laser shock enhancement

Examples

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Effect test

Embodiment 1

[0054] Such as figure 1 , figure 2 and image 3 As shown, this embodiment discloses a gas-liquid-solid coupling calculation method for laser shock peening. First, design the transient gas-liquid-solid coupling system; secondly, geometric modeling and grid division; then use FLUENT to simulate pre-processing; transient structure solution settings; finally, gas-liquid-solid system coupling settings. The simulation method mainly includes five modules, the specific modules are as follows:

[0055] 1. Transient gas-liquid-solid coupling system

[0056] Such as figure 1 A schematic diagram of the modeling process and data exchange method of the ANSYS transient gas-liquid-solid coupling system is shown. Among them, the modeling process of the transient gas-liquid-solid coupling system is as follows:

[0057] 1) In the Geometry geometric modeling module, a geometric model is established according to the distribution of the fluid and structural regions during the laser shock pee...

Embodiment 2

[0096] In this example, in order to explore the impact of high-pressure LIP bubbles on the structure in the presence of a water-constrained layer, a shock wave with a small size is used as the wave source. That is, using an initial diameter of 100 μm and a pressure of 0.1×10 9 A semicircular ideal gas bubble near the wall of Pa is used as the pressure-generating medium, and the simulation is carried out under the condition of a water-constrained layer. In order to display the relationship between the bubble pressure, bubble volume and the stress response of the structure more intuitively, the left half of the fluid region in the result graph at each moment is displayed as a pressure cloud map, and the right half is displayed as a bubble phase diagram (the darkest color in the middle is LIP The bubble phase, the darker color in the periphery is the environment phase), and the structural region is displayed as a stress cloud map. Such as image 3 Shown are the simulation resul...

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Abstract

The invention discloses a gas-liquid-solid coupling calculation method for laser shock intensification, which mainly includes the following steps: designing transient gas-liquid-solid coupling system;performing geometric modeling and mesh generation; FLUENT being used to simulate preprocessing; setup being solved by transient structure. Gas-liquid-solid coupling setup is set. Aiming at the shortcomings of the prior art, the present invention provides a simulation method based on laser shock intensification, which provides a gas- liquid- solid coupling simulation model consists of a two-phasefluid and a solid phase, which requires a transient gas that can be simultaneously generated by the two-phase fluid. Gas-liquid-solid simulation system is utilized, so using ANSYS to carry out the Gas-liquid-solid coupling simulation. This method can effectively solve the problem of parameter optimization of laser shock hardening.

Description

technical field [0001] The invention relates to the technical field of laser shock strengthening, in particular to a gas-liquid-solid coupling calculation method for laser shock strengthening. Background technique [0002] Laser shock strengthening technology is a new type of material surface strengthening method. It uses a laser beam with high power density (GW / cm2 level) and pulse width (ns level) to pass through the transparent confinement layer and act on the coated metal target. The absorbing coating on the surface of the material, the coating material absorbs the laser energy and quickly vaporizes to form a high-temperature, high-pressure plasma. The surface is strengthened. When the peak pressure of the shock wave exceeds the dynamic yield strength of the material, plastic strain occurs on the surface of the material. When the laser action ends, due to the reaction of the material in the impact area, residual compressive stress with a certain depth is generated insid...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 黄志刚黄亚军陈英怀蔡文莱葛露明
Owner GUANGDONG UNIV OF TECH
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