سال انتشار:
2021
عنوان انگلیسی مقاله:
Revised notched coating adhesion test to account for plasticity and 3D behaviour
ترجمه فارسی عنوان مقاله:
تست چسبندگی پوشش بریدگی اصلاح شده برای محاسبه انعطاف پذیری و رفتار سه بعدی
منبع:
ScienceDirect- Elsevier- Polymer Testing, 102 (2021) 107319: doi:10:1016/j:polymertesting:2021:107319
نویسنده:
Olli Orell
چکیده انگلیسی:
Specialized polyamide-imide coating on a CuSn10Pb10 substrate, a material combination utilized often in
modern bearing applications, is fabricated using the solvent casting method. The coating adhesion is studied
using the well-known notched coating adhesion (NCA) test. Conventionally, the critical strain required to cause
the debond propagation is determined by visual observation and indirectly linked to measured strain data to
calculate fracture toughness. Here, digital image correlation (DIC) is used to systemically study the coating
deformations during testing that enables quantitative determination of the instantaneous debond length. With
the introduced method, the critical strain to induce the debond of the coating and the propagation of the
debond can be determined for non-elastically behaving specimens reliably. The coating’s debond onset is
studied with virtual crack closure technique (VCCT) here. The method can take 3D effects into account in
detail and provides a sophisticated method to determine the critical energy release rate. Additionally, cohesive
zone modelling (CZM) is used to simulate debond progression. Nonlinear stress–strain responses are observed
taking place both with the coating and the substrate materials. The results emphasize that the coating plasticity
has a remarkable role in the test behaviour which needs to be taken into account in the revised analysis.
Keywords: Notched coating adhesion | Fracture toughness | Digital image correlation | Polyamide-imide | Virtual crack closure technique | Cohesive zone model
قیمت: رایگان
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