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Obtaining strain-rate dependent traction-separation law parameters of epoxy adhesive joints and predicting fracture for dissimilar bonding adherends

Darvishi, I ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijadhadh.2022.103190
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. This study investigated the mode I fracture behavior of double cantilever beam (DCB) epoxy adhesive joints with similar adherends on the both sides (i.e., aluminum-aluminum or copper-copper) at different strain rates; i.e., quasi-static (∼10−3 s−1), low (∼7 s−1) and intermediate (∼14 s−1) rates. The fracture energy of the DCB joint in Al-adhesive-Al specimens decreased (i.e., by ∼62%, p = 0.0013) with an increase in the applied strain rate from quasi-static to low values, while it remained almost unchanged with further increase of stain rate to intermediate range (p > 0.05). For Cu-adhesive-Cu cases, however, the fracture energy was found to be almost insensitive to the applied strain rate over the range tested (p > 0.05). A cohesive zone model (CZM) was built and strain-rate dependent parameters of traction-separation (TS) law were obtained. These parameters were then used to predict the fracture of epoxy adhesive joints bonded with dissimilar substrates (i.e., copper-aluminum). Predicted fracture loads of the Cu-adhesive-Al cases obtained from the stain-rate dependent model were in reasonable agreement with measured forces (i.e., from ∼0 to 24%) at a given strain rate. Therefore, once TS law parameters for Al-adhesive and Cu-adhesive interfaces were determined, the CZM could predict the fracture of the joint bonded with Al and Cu on its sides. © 2022 Elsevier Ltd
  6. Keywords:
  7. Fracture energy ; Adhesive joints ; Adhesives ; Cantilever beams ; Forecasting ; Fracture mechanics ; Separation ; Adherends ; Applied strain ; Cohesive zone model ; Double-cantilever beam ; Epoxy adhesives ; Quasi-static ; Stain rates ; Strain-rate-dependent ; Strain-rates ; Traction-separation law ; Strain rate ; Aluminum ; Copper ; Forecasts ; Fracture
  8. Source: International Journal of Adhesion and Adhesives ; Volume 118 , 2022 ; 01437496 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0143749622001075