scholarly journals Fatigue damage healing model based on dislocation reverse-back under unconstraint vibration condition for copper film

2021 ◽  
Author(s):  
Haimeng Zhang ◽  
De-Guang Shang ◽  
Xiao-Dong Liu ◽  
Yu Zhang
Keyword(s):  
Fatigue Damage ◽  
Treatment Process ◽  
Elastic Stress ◽  
Copper Film ◽  
Back Stress ◽  
Vibration Condition ◽  
Pile Up ◽  
Motion Resistance ◽  
Damage Healing ◽  
Healing Model

In this investigation, it is found that the generated elastic stress during the unconstraint vibration treatment process can act as the dislocation driving stress on the dislocation in the micro-scale. When the sum of the dislocation driving stress, the image stress and the back stress exceeds the motion resistance of the dislocations in a pile-up, the dislocations begin to reverse back, and the pile-up disappear. Based on this principle, a fatigue damage-healing model under unconstraint vibration condition was proposed. The verified results showed that the damaged copper film can be effectively healed by the vibration guided by the model calculation.

A nonlinear fatigue damage-healing model for copper film by LSP

2014 ◽  
Vol 37 (11) ◽  
pp. 1232-1241 ◽  
Author(s):  
L-H. Zhang ◽  
D-G. Shang ◽  
X-D. Liu ◽  
Y-J. Sun ◽  
Y-B. Guo ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
Copper Film ◽  
Damage Healing ◽  
Healing Model

A unified damage-healing model for laser shock repair of copper film

2014 ◽  
Vol 63 ◽  
pp. 145-153 ◽  
Author(s):  
Xiao-Dong Liu ◽  
De-Guang Shang ◽  
Li-Hong Zhang ◽  
Tao Chen ◽  
Y.B. Guo ◽  
...  
Keyword(s):  
Copper Film ◽  
Laser Shock ◽  
Damage Healing ◽  
Healing Model

Effect of unconstraint vibration treatment on fatigue damage healing for copper film

2019 ◽  
Vol 764 ◽  
pp. 138265
Author(s):  
Hai-Meng Zhang ◽  
De-Guang Shang ◽  
Xiao-Dong Liu ◽  
Ya-Nan Liu ◽  
Yu Zhang
Keyword(s):  
Fatigue Damage ◽  
Copper Film ◽  
Vibration Treatment ◽  
Damage Healing

scholarly journals Topology optimization for transversely isotropic materials with high-cycle fatigue as a constraint

2020 ◽  
Vol 63 (1) ◽  
pp. 161-172
Author(s):  
Shyam Suresh ◽  
Stefan B. Lindström ◽  
Carl-Johan Thore ◽  
Anders Klarbring
Keyword(s):  
Topology Optimization ◽  
Fatigue Damage ◽  
High Cycle Fatigue ◽  
Transverse Isotropy ◽  
Transversely Isotropic ◽  
Back Stress ◽  
Optimization Method ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Time Model

AbstractWe propose a topology optimization method for design of transversely isotropic elastic continua subject to high-cycle fatigue. The method is applicable to design of additive manufactured components, where transverse isotropy is often manifested in the form of a lower Young’s modulus but a higher fatigue strength in the build direction. The fatigue constraint is based on a continuous-time model in the form of ordinary differential equations governing the time evolution of fatigue damage at each point in the design domain. Such evolution occurs when the stress state lies outside a so-called endurance surface that moves in stress space depending on the current stress and a back-stress tensor. Pointwise bounds on the fatigue damage are approximated using a smooth aggregation function, and the fatigue sensitivities are determined by the adjoint method. Several problems where the objective is to minimize mass are solved numerically. The problems involve non-periodic proportional and non-proportional load histories. Two alloy steels, AISI-SAE 4340 and 34CrMo6, are treated and the respective as well as the combined impact of transversely isotropic elastic and fatigue properties on the design are compared.

Healing fatigue damage by laser shock peening for copper film

2013 ◽  
Vol 54 ◽  
pp. 127-132 ◽  
Author(s):  
Xiao-Dong Liu ◽  
De-Guang Shang ◽  
Ming Li ◽  
Jia Jin ◽  
Tao Chen ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
Copper Film ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening
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