Effects of surface oxide layers on crack initiation and growth of HSLA steel under cyclic loading in air and in ultrahigh vacuum

1995 ◽  
Vol 30 (24) ◽  
pp. 6370-6376 ◽  
Author(s):  
Y. W. Chung ◽  
W. J. Lee
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Hsla Steel ◽  
Ultrahigh Vacuum ◽  
Surface Oxide ◽  
Oxide Layers

Crack initiation and crack propagation under thermal cyclic loading

1990 ◽  
Vol 8 (2) ◽  
pp. 98-104 ◽  
Author(s):  
K. Bethge ◽  
D. Munz ◽  
J. Neumann
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Crack Propagation

Crack Propagation Prediction Using Haensel Damage Model

2012 ◽  
Author(s):  
Piotr Bednarz ◽  
Jaroslaw Szwedowicz
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Crack Propagation ◽  
Damage Model ◽  
Lifetime Prediction ◽  
Dissipated Energy ◽  
Mathematical Approach ◽  
Loading Conditions ◽  
Stored Energy ◽  
Tensile Stresses

The Haensel damage model correlates lifetime of a component until crack initiation to the dissipated and stored energy in the material during cyclic loading. The crack initiation is influenced by mean stresses. The Haensel damage model considers the mean stress effect by including compressive and tensile stresses in calculations of elastic strain energy during cyclic loading conditions. The goal of the paper is to extend the above model to predict crack propagation under large cyclic plasticity and non-proportional loading conditions. After voids initiation onset of necking, voids growth and linking takes place among them. During this process a mesocrack is created. This stage of fracture involves the same amount of released energy for new crack surface creation as dissipated energy for mesocrack initiation. The amount of dissipated and stored energy is related to the process zone size and to the number of cycles. Ilyushin’s postulate is used to calculate the amount of dissipated energy. In order to consider a contribution of tensile stresses only during loading to crack propagation, tensile/compressive split is performed for the stress tensor. One of the key drivers of this paper is to provide a straightforward engineering approach, which does not require explicit modelling of cracks. The proposed mathematical approach accounts for redistribution of stresses, strains and energy during crack propagation. This allows to approximate the observed effect of distribution of dissipated energy on the front of a crack tip. The developed approach is validated through FE (Finite Element) simulations of the Dowling and Begley experiment. The Haensel lifetime prediction of Dowling’s experiment is in good agreement with the experimental data and the explicit FE results. Finally, the proposed mathematical approach simplifies significantly the engineering effort for Nonlinear Fracture Mechanics lifetime prediction by avoiding the requirement to simulate real crack propagation using node base release methods, XFEM or remeshing procedures.

scholarly journals Enhanced osteogenic activity of Ti alloy implants by modulating strontium configuration in their surface oxide layers

RSC Advances ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 3051-3060 ◽  
Author(s):  
Zhengjiang Xu ◽  
Huaifeng Lu ◽  
Jian Lu ◽  
Chen Lv ◽  
Xiaobing Zhao ◽  
...  
Keyword(s):  
Surface Oxide ◽  
Ti Alloy ◽  
Coating System ◽  
Oxide Layers ◽  
Osteogenic Activity

Strontium configurations can modulate its release in the SrO–TiO2coating system, thus being able to control the interfacial osteogenesis.

Crack tip fields at crack initiation and growth under monotonic and large amplitude cyclic loading: Experimental and FE analyses

2020 ◽  
Vol 141 ◽  
pp. 105889
Author(s):  
Jin-Ha Hwang ◽  
Hune-Tae Kim ◽  
Yun-Jae Kim ◽  
Hyun-Suk Nam ◽  
Jin-Weon Kim
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Large Amplitude ◽  
Crack Tip ◽  
Crack Tip Fields

ChemInform Abstract: STRUCTURAL CHANGES OF SURFACE OXIDE LAYERS ON PALLADIUM

1982 ◽  
Vol 13 (32) ◽  
Author(s):  
T. CHIERCHIE ◽  
C. MAYER ◽  
W. J. LORENZ
Keyword(s):  
Structural Changes ◽  
Surface Oxide ◽  
Oxide Layers

InP metal‐insulated‐semiconductor Schottky contacts using surface oxide layers prepared with bromine water

1980 ◽  
Vol 51 (9) ◽  
pp. 4905-4907 ◽  
Author(s):  
K. Kamimura ◽  
T. Suzuki ◽  
A. Kunioka
Keyword(s):  
Schottky Contacts ◽  
Surface Oxide ◽  
Oxide Layers ◽  
Bromine Water
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