کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
252290 | 502960 | 2012 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Identification of material parameters for modelling delamination in the presence of fibre bridging Identification of material parameters for modelling delamination in the presence of fibre bridging](/preview/png/252290.png)
Delamination processes often exhibit an increase in delamination resistance, or R-curve, with crack extension. It is shown that cohesive laws can represent the R-curves due to large-scale fibre bridging and that the shape of the cohesive laws can be derived from conventional experimental results. Two approaches are investigated for determining the shape parameters of cohesive laws. The first approach consists of extracting the cohesive parameters from experimental R-curves through the use of a new semi-analytical equation. The second approach consists of a numerical optimization procedure that identifies material parameters by reducing the error between a finite element model and the experimental load–deflection results. The second approach is advantageous when fibre bridging introduces inaccuracies in the experimental energy release rate measurements. In addition, the second approach can be extended to allow more complex approximations of cohesive laws.
Journal: Composite Structures - Volume 94, Issue 11, November 2012, Pages 3240–3249