材料科学
胶粘剂
聚氨酯
复合材料
增长率
流离失所(心理学)
应变率
巴黎法
应变能释放率
活化能
断裂力学
裂缝闭合
化学
数学
心理学
几何学
有机化学
图层(电子)
心理治疗师
作者
Demétrio Jackson dos Santos,A. Akhavan‐Safar,Ricardo J. C. Carbas,E.A.S. Marques,Sabine Wenig,Lucas F. M. da Silva
标识
DOI:10.1080/00218464.2023.2225415
摘要
In this study, the effect of temperature (below and above Tg) on the rate of crack growth and on the fatigue threshold energy release rate of a polyurethane (PU) adhesive is analysed. The effect on the results of the Paris law relation used is also investigated. Tests were performed under a displacement-control strategy and at different temperatures. Out of the experimental data, the threshold energy release rate was determined as a function of temperature, something which up until now has been much more common for adhesive systems other than polyurethane. Results showed that the threshold energy release rate diminishes with increasing temperature, while the crack growth rate increases for a given strain energy release rate. The ratio between the threshold energy release rate and critical strain energy release rate remained constant for tests above the Tg, indicating that fatigue tests need only be performed at one temperature when above the Tg at least for the range of temperatures considered in this study and for the adhesive tested. A Paris law relation taking into account the effect of R-ratio during the displacement-control fatigue tests proved effective in unifying results at different temperatures.
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