Improvement of impact strength of joints bonded with multi-layered property-graded pressure sensitive adhesive

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630006
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: SATO CHIAKI 東京工業大学, 科学技術創成研究院, 准教授 (80235366)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 多層粘着剤 / 破壊じん性 / DCB試験 / 結合力モデル / Traction-Separation Rule / キャビテーション

Outline of Final Research Achievements

To improve the strength and impact resistance of joints, the properties of the multilayer pressure-sensitive adhesive whose physical properties were optimally graded in the thickness direction were experimentally investigated. Specifically, a high elastic modulus layer with relatively high strength was placed in the center, and this was sandwiched at both sides with low elastic modulus layers having high initial tack to achieve both adhesive strength and holding power. Since the good compatibility between the high modulus layer and the low modulus layers determines the overall strength, the distribution of characteristics in the thickness direction is important. In this study, the distribution of optimum physical property was tired to obtain by finite element analysis, and specimens were fabricated, and the impact tests was conducted to confirm the effect. It was not verified that the impact strength of the joints can be improved by encapsulating nano bubbles.

Free Research Field

材料力学