scholarly journals Determination of laser shock treatment conditions for fatigue testing of Ni-based superalloys

1993 ◽  
Vol 03 (C7) ◽  
pp. C7-921-C7-926 ◽  
Author(s):  
P. FORGET ◽  
M. JEANDIN ◽  
A. LYORET
Keyword(s):  
Fatigue Testing ◽  
Shock Treatment ◽  
Laser Shock ◽  
Treatment Conditions ◽  
Laser Shock Treatment

Methods for the suppression of “residual stress holes” in laser shock treatment

2021 ◽  
pp. 102486
Author(s):  
Guoxin Lu ◽  
Lu Wang ◽  
Heng Li ◽  
Zhong Ji ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Shock Treatment ◽  
Laser Shock ◽  
Laser Shock Treatment

Response of silicon nitride ceramics subject to laser shock treatment

2021 ◽  
Author(s):  
P. Shukla ◽  
X. Shen ◽  
Ric Allott ◽  
Klaus Ertel ◽  
S. Robertson ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Shock Treatment ◽  
Laser Shock ◽  
Nitride Ceramics ◽  
Laser Shock Treatment

Outlooks in laser work hardening for characteristics increase of parts obtained by selective laser melting

2018 ◽  
Vol 2018 (7) ◽  
pp. 32-37
Author(s):  
Д. Мельников ◽  
D. Melnikov ◽  
Е. Калёнова ◽  
E. Kalyonova ◽  
Зо Зо Йе Мьят ◽  
...  
Keyword(s):  
Surface Layer ◽  
Selective Laser Melting ◽  
Work Hardening ◽  
Shock Treatment ◽  
Fatigue Properties ◽  
Laser Shock ◽  
Laser Melting ◽  
Near Surface ◽  
Hybrid Technology ◽  
Laser Shock Treatment

The paper deals with the development of a new hybrid technology – 3D laser work hardening which consists in the integration of laser shock treatment (laser work hardening) into the process of selective laser melting. The technology offered will allow obtaining an area of compressing residual stresses in a near surface layer and achieving the improvement of mechanical and fatigue properties of parts manufactured. In this paper the aluminum alloy samples were processed with laser work hardening with the use of uncommon absorbing and transparent layers (foil and glass) which are necessary for the introduction selective laser melting in a plant. Modes of laser work hardening were also investigated which may be used in the hybrid technology offered.

TESTS COATINGS UNDER VARIABLE LOADS

2017 ◽  
pp. 95-98
Author(s):  
N. L. Venediktov ◽  
A. N. Venediktov ◽  
I. M. Kovenskiy
Keyword(s):  
Fatigue Testing ◽  
Laboratory Scale ◽  
Kinematic Scheme ◽  
Electrolytic Coating ◽  
Test Parameters ◽  
Experimental Laboratory

The experimental laboratory-scale plant for the fatigue testing of samples with electrolytic coating were designed and constructed. Shows the kinematic scheme and considered the principle of the plant. The dependences for determination of test parameters and the method of testing samples with coatings under variable loads were obtained.

Surface Modification Analysis after Shot Peening of AA 7075 in Different States

2013 ◽  
Vol 768-769 ◽  
pp. 519-525 ◽  
Author(s):  
Sebastjan Žagar ◽  
Janez Grum
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Shot Peening ◽  
Fatigue Testing ◽  
Stress Profile ◽  
Treatment Conditions ◽  
Stress Profiles ◽  
Compressive Residual Stresses

The paper deals with the effect of different shot peening (SP) treatment conditions on the ENAW 7075-T651 aluminium alloy. Suitable residual stress profile increases the applicability and life cycle of mechanical parts, treated by shot peening. The objective of the research was to establish the optimal parameters of the shot peening treatment of the aluminium alloy in different precipitation hardened states with regard to residual stress profiles in dynamic loading. Main deformations and main residual stresses were calculated on the basis of electrical resistance. The resulting residual stress profiles reveal that stresses throughout the thin surface layer of all shot peened specimens are of compressive nature. The differences can be observed in the depth of shot peening and the profile of compressive residual stresses. Under all treatment conditions, the obtained maximum value of compressive residual stress ranges between -200 MPa and -300 MPa at a depth between 250 μm and 300 μm. Comparison of different temperature-hardened aluminium alloys shows that changes in the Almen intensity values have greater effect than coverage in the depth and profile of compressive residual stresses. Positive stress ratio of R=0.1 was selected. Wöhler curves were determined in the areas of maximum bending loads between 30 - 65 % of material's tensile strength, measured at thinner cross-sections of individual specimens. The results of material fatigue testing differ from the level of shot peening on the surface layer.

Use of DNVGL-RP-C203 for Determining the Fatigue Capacity of Connectors

2021 ◽  
Author(s):  
Anthony Muff ◽  
Anders Wormsen ◽  
Torfinn Hørte ◽  
Arne Fjeldstad ◽  
Per Osen ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Testing ◽  
Experimental Testing ◽  
High Strength ◽  
Element Model ◽  
Fatigue Analysis ◽  
Full Scale ◽  
The Finite Element Model

Abstract Guidance for determining a S-N based fatigue capacity (safe life design) for preloaded connectors is included in Section 5.4 of the 2019 edition of DNVGL-RP-C203 (C203-2019). This section includes guidance on the finite element model representation, finite element based fatigue analysis and determination of the connector design fatigue capacity by use of one of the following methods: Method 1 by FEA based fatigue analysis, Method 2 by FEA based fatigue analysis and experimental testing and Method 3 by full-scale connector fatigue testing. The FEA based fatigue analysis makes use of Appendix D.2 in C203-2019 (“S-N curves for high strength steel applications for subsea”). Practical use of Section 5.4 is illustrated with a case study of a fatigue tested wellhead profile connector segment test. Further developments of Section 5.4 of C203-2019 are proposed. This included acceptance criteria for use of a segment test to validate the FEA based fatigue analysis of a full-scale preloaded connector.

TOOKAD®Soluble vascular-targeted photodynamic (VTP) therapy: determination of optimal treatment conditions and assessment of effects in patients with localised prostate cancer

2013 ◽  
Vol 112 (6) ◽  
pp. 766-774 ◽  
Author(s):  
Abdel-Rahmène Azzouzi ◽  
Eric Barret ◽  
Caroline M. Moore ◽  
Arnaud Villers ◽  
Clare Allen ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Optimal Treatment ◽  
Treatment Conditions

Verification of Methods Used for Fatigue Testing of Small Steel Specimens Taken from Existing Structures

2016 ◽  
Vol 250 ◽  
pp. 232-237
Author(s):  
Tomasz Tomaszewski ◽  
Janusz Sempruch ◽  
Przemysław Strzelecki
Keyword(s):  
Fatigue Testing ◽  
Experimental Tests ◽  
Fatigue Tests ◽  
Steel Plates ◽  
Existing Structures ◽  
Testing Method ◽  
Standard Specimens ◽  
Different Thickness ◽  
Small Steel

This paper presents results of fatigue tests performed on standard specimens and minispecimens taken from two EN 1.4301 acid-resistant steel plates of different thickness. The tests were required for determination of the state of vibrating machines made from the same material. The results confirmed that the proposed testing method can be used for experimental tests.

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