Influence of low magnitude plastic strains on residual stress in 7075 aluminium alloy

Robinson, J. S.; Wimpory, Robert C.

doi:10.1080/02670836.2019.1625555

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…7075-T651 Al alloy is extensively used in the components (cabin frame, plane's wings, the skin of wings, and bearing beam) of automotive and aerospace components, which gives rise on superior performances such as the low density, high specific strength, strong corrosion-resistance, good fracture toughness [1][2][3]. However, the component has different degrees of deformation due to the stress distribution and materials surface hardness change after shot peening (SP), which may lead to surface stress reorganization [4] and affect the performance [5,6]. How to accurately control the surface characteristics of materials such as stress and hardness by shot peening has become a research hotspot [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristic Function of Al Alloy after Shot Peening

2021

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The work aims to study the change rule of the surface properties of aluminum (Al) alloy after shot peening (SP), and obtain the corresponding relationship between the surface material characteristics and SP parameters. Firstly, the Finite Element Model (FEM) of multi-projectile impact Al alloy specimen was established by ANSYS/LS-DYNA (Version: Ansys15.0). Box-Benhnken design method (BBD) was used to design 3-level and 3-factor shot peening experiment with shot peening pressure. Projectile size, jet distance, the surface residual stress, as well as deformation were taken as responses. The surface stress and the deformation at the crater were obtained according to the experiments. Then, Design-Expert software was adopted to fit the values to attain the multiple regression quadratic equations, and the response surface methodology (RSM) was applied to analyse the interaction between the various factors. The degree of model-fitting was simultaneously identified in accordance with an analysis of variance of the function models. Finally, the shot peening test was carried out using 7075-T651 Al alloy as the specimen. Combined with the X-ray diffraction (XRD) stress test and the optical microscopic observation of the crater section, the value of stress and deformation value could be determined to verify the accuracy of the model. The adjusted R2 of the stress function model and the deformation function model were 94.85% and 95.08%, respectively. The deviation between calculated stress value and the experimental value was less than 5.5%. The deformation of the section showed that the deformed layer of the specimen was approximately the same as calculation value. The result indicated the function model had high accuracy. The analysis suggested that the function model could quickly and precisely deduce the parameter combination of the SP from the surface stress or deformation of the material, which provided a diversity reference for the surface stress and hardness strengthening of SP.

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Section: Introductionmentioning

confidence: 99%

Surface Characteristic Function of Al Alloy after Shot Peening

2021

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“…[ 159 ] Moreover, it was revealed that surface compressive residual stress is influenced by the implementation of cold compression to a higher degree than the interior tensile stresses. [ 160 ] Accomplishing slitting technique coupled with statistical analyses, Asghari et al [ 161 ] scrutinized the impact of the cooling condition on the residual stresses of CFRP shells, reporting that temperature differences between curing and cooling conditions induce thermal shock, resulting in the building up of high residual stress levels, which, in turn, accelerates the structural failure. Simultaneous cooling conditions and CNT reinforcement effects were studied in another paper, [ 162 ] indicating that the influence of cooling conditions on the residual thermal stresses becomes more significant when the CNT percentage decreases.…”

Section: Origins and Effectsmentioning

confidence: 99%

Residual Stress in Engineering Materials: A Review

et al. 2021

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The accurate determination of residual stresses has a crucial role in understanding the complex interactions between microstructure, mechanical state, mode(s) of failure, and structural integrity. Moreover, the residual stress management concept contributes to industrial applications, aiming to improve the product's service performance and life cycle. In this regard, the industry requests rapid, efficient, and modern methods to identify and control the residual stress state. This review article contains three main sections. The first section covers different residual stress determination methods and reports the advancements over the recent decade. The second section includes the role of residual stresses in the performance of a broad range of materials including metallic alloys, polymers, ceramics, composites, and biomaterials. This is presented by classifying different science areas dealing with residual stresses into two main groups, including “origins” and “effects” of residual stresses. The range of topics covered are “welding, machining, curing/cooling, and spray coating processes,” “medical and dental sciences,” and “fatigue and fracture mechanisms.” The third section summarizes various strategies to effectively control residual stresses through different manufacturing procedures. It is hoped that the data provided herein serves as a valuable up‐to‐date reference for engineers and scientists in the field of residual stress.

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Reduction in Residual Stress during Plastic Deformation of the Aluminum Alloy 7449

Robinson

Pirling

Truman

2020

Materials Performance and Characterization

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Rectilinear blocks of the very high-strength aerospace aluminum alloy 7449 were solution treated and cold water quenched. They were then stress relieved immediately by cold compression. The amount of cold compression was systematically varied from 0 to 0.3 %. The amount of plastic strain was limited to well below the industrial standard of ~2 %. The blocks then received a stabilizing aging treatment. The residual stress distribution remaining in the blocks was characterized using neutron diffraction, with the aim of tracking how the through thickness 3-D residual strains and stresses change as cold compression progresses. Stress relief was of the order of 30–50 %, but there was no discernible systematic increase in stress relief as the plastic deformation magnitude was increased. It is suggested that this is mainly due to the differences between the samples being less than the experimental uncertainty of the neutron diffraction strain measurement technique.

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Influence of low magnitude plastic strains on residual stress in 7075 aluminium alloy

Cited by 3 publications

References 30 publications

Surface Characteristic Function of Al Alloy after Shot Peening

Surface Characteristic Function of Al Alloy after Shot Peening

Residual Stress in Engineering Materials: A Review

Reduction in Residual Stress during Plastic Deformation of the Aluminum Alloy 7449

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