東華大學圖書館 |

Material Response to Fretting and Sliding Wear Phenomena /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Material Response to Fretting and Sliding Wear Phenomena // Akshat Sharma.
作者:	Sharma, Akshat,
面頁冊數:	1 electronic resource (172 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
Contained By:	Dissertations Abstracts International86-04B.
標題:	Load. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31285266
ISBN:	9798342104746

Material Response to Fretting and Sliding Wear Phenomena /
Sharma, Akshat,

Material Response to Fretting and Sliding Wear Phenomena /Akshat Sharma. - 1 electronic resource (172 pages)

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

Fretting wear occurs when two contacting bodies under load are subjected to small amplitude oscillatory motion. Depending on the applied normal load, displacement amplitude, coefficient of friction and resulting shear force, two types of fretting wear regimes exist - (i) partial slip and (ii) gross slip. At displacement amplitudes higher than gross slip condition, sliding wear regime prevails. Fretting wear becomes dominant in machine components subject to vibrations such as bearings, dovetail joints, etc. whereas sliding wear is observed in brakes, piston-ring applications, etc. The work in this dissertation primarily focuses on characterizing the material response of various machine components subjected to fretting and sliding wear regimes.At first, the friction and fretting wear behavior of inlet ring and spring clip components used in land-based gas turbines was investigated at elevated (500°C) temperature. In order to achieve this objective, a novel high-temperature fretting wear apparatus was designed and developed to simulate the conditions existing in a gas turbine. The test apparatus was used to investigate fretting wear of atmospheric plasma sprayed (APS) Cr3C2-NiCr (25% wt.), high-velocity oxy-fuel (HVOF) sprayed Cr3C2-NiCr (25% wt.), HVOF sprayed T-800 and APS sprayed PS400coated inlet rings against HVOF-sprayed Cr3C2-NiCr (25% wt.) coated spring clip. The PS400 coated inlet rings demonstrated a significant reduction in friction and wear. A finite element (FE) framework was also developed to simulate fretting wear in HVOF-sprayed Cr3C2-NiCr composite cermet coating. The material microstructure was modelled using Voronoi tessellations with a log-normal distribution of grain size. Moreover, the individual material phases in the coating were randomly assigned to resemble the microstructure from an actual SEM micrograph. A damage mechanics based cohesive zone model with grain deletion algorithm was used to simulate debonding of the ceramic carbide phase from the matrix and resulting degradation from repeated fretting cycles. The specific wear rate obtained from the model for the existing material microstructure was benchmarked against experiments. Novel material microstructures were also modeled and demonstrated to show less scatter in wear rate.Following, a three-dimensional (3D) continuum damage mechanics (CDM) FE model was developed to investigate the effects of fretting wear on rolling contact fatigue (RCF) of bearing steels. In order to determine the fretting scar geometry, a 3D arbitrary Lagrangian-Eulerian (ALE) adaptive mesh (AM) FE model was developed to simulate fretting wear between two elastic bodies for different initially pristine fretting pressures (0.5, 0.75 and 1 GPa) and friction coefficients (0.15, 0.175 and 0.25) resulting in stick zone to contact width ratios, c/a = 0.35, 0.55 and 0.75. The resulting wear profiles were subjected to various initially pristine RCF pressures (1, 2.2 and 3.4 GPa). The pressure profiles for RCF were determined by moving the contact over the fretted wear profiles in 21 steps. These pressure profiles were then used in the CDM-FE model to predict the RCF life of fretted surfaces. The results indicate that increased fretting pressure leads to more wear on the surface, thereby reducing RCF life. As the RCF pressure increases (PRCF≥ 2.2 GPa), the effect of fretting on RCF life decreases for all fretting pressures and c/a values, indicating that life is primarily governed by the RCF pressure.

English

ISBN: 9798342104746Subjects--Topical Terms:

3562902
Load.

Material Response to Fretting and Sliding Wear Phenomena /
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245 1 0 $a Material Response to Fretting and Sliding Wear Phenomena / $c Akshat Sharma.
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520 $a Fretting wear occurs when two contacting bodies under load are subjected to small amplitude oscillatory motion. Depending on the applied normal load, displacement amplitude, coefficient of friction and resulting shear force, two types of fretting wear regimes exist - (i) partial slip and (ii) gross slip. At displacement amplitudes higher than gross slip condition, sliding wear regime prevails. Fretting wear becomes dominant in machine components subject to vibrations such as bearings, dovetail joints, etc. whereas sliding wear is observed in brakes, piston-ring applications, etc. The work in this dissertation primarily focuses on characterizing the material response of various machine components subjected to fretting and sliding wear regimes.At first, the friction and fretting wear behavior of inlet ring and spring clip components used in land-based gas turbines was investigated at elevated (500°C) temperature. In order to achieve this objective, a novel high-temperature fretting wear apparatus was designed and developed to simulate the conditions existing in a gas turbine. The test apparatus was used to investigate fretting wear of atmospheric plasma sprayed (APS) Cr3C2-NiCr (25% wt.), high-velocity oxy-fuel (HVOF) sprayed Cr3C2-NiCr (25% wt.), HVOF sprayed T-800 and APS sprayed PS400coated inlet rings against HVOF-sprayed Cr3C2-NiCr (25% wt.) coated spring clip. The PS400 coated inlet rings demonstrated a significant reduction in friction and wear. A finite element (FE) framework was also developed to simulate fretting wear in HVOF-sprayed Cr3C2-NiCr composite cermet coating. The material microstructure was modelled using Voronoi tessellations with a log-normal distribution of grain size. Moreover, the individual material phases in the coating were randomly assigned to resemble the microstructure from an actual SEM micrograph. A damage mechanics based cohesive zone model with grain deletion algorithm was used to simulate debonding of the ceramic carbide phase from the matrix and resulting degradation from repeated fretting cycles. The specific wear rate obtained from the model for the existing material microstructure was benchmarked against experiments. Novel material microstructures were also modeled and demonstrated to show less scatter in wear rate.Following, a three-dimensional (3D) continuum damage mechanics (CDM) FE model was developed to investigate the effects of fretting wear on rolling contact fatigue (RCF) of bearing steels. In order to determine the fretting scar geometry, a 3D arbitrary Lagrangian-Eulerian (ALE) adaptive mesh (AM) FE model was developed to simulate fretting wear between two elastic bodies for different initially pristine fretting pressures (0.5, 0.75 and 1 GPa) and friction coefficients (0.15, 0.175 and 0.25) resulting in stick zone to contact width ratios, c/a = 0.35, 0.55 and 0.75. The resulting wear profiles were subjected to various initially pristine RCF pressures (1, 2.2 and 3.4 GPa). The pressure profiles for RCF were determined by moving the contact over the fretted wear profiles in 21 steps. These pressure profiles were then used in the CDM-FE model to predict the RCF life of fretted surfaces. The results indicate that increased fretting pressure leads to more wear on the surface, thereby reducing RCF life. As the RCF pressure increases (PRCF≥ 2.2 GPa), the effect of fretting on RCF life decreases for all fretting pressures and c/a values, indicating that life is primarily governed by the RCF pressure.
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650 4 $a Humidity. $3 3559498
650 4 $a Bearings. $3 3696649
650 4 $a Grain boundaries. $3 748639
650 4 $a Normal distribution. $3 3561025
650 4 $a Crack initiation. $3 3564902
650 4 $a Wear tests. $3 3817137
650 4 $a Adhesive wear. $3 3817138
650 4 $a Energy. $3 876794
650 4 $a Grain size. $3 3682362
650 4 $a Microstructure. $3 555179
650 4 $a Mechanics. $3 525881
650 4 $a Boundary conditions. $3 3560411
650 4 $a Nitrogen. $3 1314426
650 4 $a Corrosion. $3 3595443
650 4 $a Friction. $3 650299
650 4 $a Carbon. $3 604057
650 4 $a Wear resistance. $3 3817139
650 4 $a Chemical vapor deposition. $3 621056
650 4 $a Lubricants & lubrication. $3 3559685
650 4 $a Industrial engineering. $3 526216
650 4 $a Materials science. $3 543314
650 4 $a Mathematics. $3 515831
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710 2 $a Purdue University. $e degree granting institution. $3 3759105
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