LAPSE:2023.36182
Published Article
LAPSE:2023.36182
Coupled Excitation Strategy for Crack Initiation at the Adhesive Interface of Large-Sized Ultra-Thin Chips
Tao Wu, Xin Chen, Shiju Wen, Fangsong Liu, Shengping Li
July 4, 2023
The initial excitation of interface crack of large-size ultra-thin chips is one of the most complicated technical challenges. To address this issue, the reversible fracture characteristics of a silicon-based chip (chip size: 1.025 mm × 0.4 mm × 0.15 mm) adhesive layer interface was examined by scanning electron microscope (SEM) tests, and the characteristics of a cohesive zone model (CZM) unit were obtained through peel testing. The fitting curve of the elastic bilinear model was in high agreement with the experimental data, with a correlation coefficient of 0.98. The maximum energy release rate required for stripping was GC = 10.3567 N/m. Subsequently, a cohesive mechanical model of large-size ultra-thin chip peeling was established, and the mechanical characteristics of crack initial excitation were analyzed. The findings revealed that the larger deflection peeling angle in the peeling process resulted in a smaller peeling force and energy release rate (ERR), which made the initial crack formation difficult. To mitigate this, a coupling control method of structure and force surface was proposed. In this method, through structural coupling, the change in chip deflection was greatly reduced through the surface coupling force, and the peeling angle was greatly improved. It changed the local stiffness of the laminated structure, made the action point of fracture force migrate from the center of the chip to near the edge of the chip, the peeling angle was increased, and the energy release rate was locally improved. Finally, combined with mechanical analysis and numerical simulation of the peeling process, the mechanical characteristics of peeling were analyzed in detail. The results indicated that during the initial crack germination process, the ERR of the peel interface is significantly increased, the maximum stress value borne by the chip is significantly reduced, and the peel safety and reliability are greatly improved.
Keywords
cohesion zone model, coupling excitation of crack initiation, non-destructive chip peeling of large-size ultra-thin chip, peeling angle
Suggested Citation
Wu T, Chen X, Wen S, Liu F, Li S. Coupled Excitation Strategy for Crack Initiation at the Adhesive Interface of Large-Sized Ultra-Thin Chips. (2023). LAPSE:2023.36182
Author Affiliations
Wu T: College of Engineering, Shantou University, Shantou 515063, China [ORCID]
Chen X: College of Engineering, Shantou University, Shantou 515063, China
Wen S: College of Engineering, Shantou University, Shantou 515063, China
Liu F: College of Engineering, Shantou University, Shantou 515063, China
Li S: College of Engineering, Shantou University, Shantou 515063, China
Journal Name
Processes
Volume
11
Issue
6
First Page
1637
Year
2023
Publication Date
2023-05-26
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr11061637, Publication Type: Journal Article
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LAPSE:2023.36182
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doi:10.3390/pr11061637
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Jul 4, 2023
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Jul 4, 2023
 
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Calvin Tsay
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