Effect of the Deformation State on the Mechanical Degradation of Cu Metal Films on Flexible PI Substrates During Cyclic Sliding Testing

Bag, Atanu; Park, Ki‐Seong; Choi, Shi‐Hoon

doi:10.1007/s12540-018-0155-y

Cited by 10 publications

(2 citation statements)

References 45 publications

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“…Interrupted bending tests were also conducted on the same-sized specimens at an interval of a bending angle of 3°. According to the previous bending procedures coupled with a digital image correlation (DIC) technique 35 – 37 , the local tensile strain was concentrated mainly at the center of the outer surface of the bend specimen. Thus, the specimen was bent at a certain bending angle, taken out from the test set-up, and half-sectioned along the longitudinal direction.…”

Section: Methodsmentioning

confidence: 99%

Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Kim

et al. 2021

Sci Rep

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The bending angle at the peak load is regarded as the most important parameter for evaluating bending properties of hot-press-forming (HPF) steels. However, it is not a mechanics-based parameter for the bending criterion, and the data interpretation is difficult because bending criteria in relation with microstructures and associated bending mechanisms have not been verified yet. In this study, effects of coating and baking treatments on bending angles at the peak load of three kinds of 1470 MPa-grade HPF steels were investigated by interrupted three-point bending tests coupled with direct microstructural observation. According to direct observations of sequential cracking processes of V-shaped crack (V-crack), bending procedures were classified into four stages: (1) formation of small V-crack, (2) increase in number and size of V-cracks, (3) initiation of shear-crack propagation from the V-crack tip, and (4) further propagation and opening of the shear crack. The minimum bending angle required for initiating the shear-crack propagation from the V-crack tip was defined as a critical angle, which meant the boundary between the 2nd and 3rd stages. The present bending behavior related with critical bending angle and V-cracking could be interpreted similarly by the fracture-mechanics concept, i.e., the initiation of shear-crack propagation.

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Section: Methodsmentioning

confidence: 99%

Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Kim

et al. 2021

Sci Rep

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show abstract

“…23,24 In addition, some scholars have also conducted some numerical studies. Using finite element analysis, Bag et al 25 studied the Cu thin film's deformation behavior and strain distribution on a flexible PI substrate during the cyclic sliding test. Using molecular dynamics simulation, Chang and Fang.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of fatigue behavior of flexible metal films in multiphysics fields

Zheng

Huang

2022

Fatigue Fract Eng Mat Struct

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The operating ambient of flexible electronics interconnects is a complex environment that includes mechanical deformation, electric current, and temperature. It is a potential threat to the long‐term service reliability of flexible electronic devices. This paper aims to develop a multiphysics fatigue model for flexible metal films. The effect of multiphysics fields is considered in the Coffin–Manson relationship based on reasonable simplification. The fatigue behavior of copper films of various thicknesses on a flexible substrate was investigated when electrical current and mechanical displacement loads were applied simultaneously. The developed model is validated to compare with experimental results. The numerical results show that it can analyze the effect of multiphysics fields and predict the fatigue life of copper films. Therefore, it could be a means to assess the fatigue performance of metal films on flexible substrates in multiphysics fields.

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Electro-mechanical Degradation Model of Flexible Metal Films Due to Fatigue Damage Accumulation

Sun

Huang

2019

Met. Mater. Int.

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Effect of the Deformation State on the Mechanical Degradation of Cu Metal Films on Flexible PI Substrates During Cyclic Sliding Testing

Cited by 10 publications

References 45 publications

Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Interpretation of surficial shear crack propagation mechanisms in bending for Zn or AlSi coated hot press forming steels

Numerical simulation of fatigue behavior of flexible metal films in multiphysics fields

Electro-mechanical Degradation Model of Flexible Metal Films Due to Fatigue Damage Accumulation

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