![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
Abstract
The present paper is concerned with constitutive modeling of two different bulk structural adhesives at strain rates from 10−3 to 103/s using a modified Ramberg-Osgood equation. Commercially available two-part methacrylate structural adhesive and epoxy structural adhesive were tested. The high strain-rate compressive stress-strain loops for the two bulk structural adhesives were determined with a conventional split Hopkinson pressure bar using a tapered striker bar. Static and intermediate rate compressive stress-strain curves were measured in an Instron® testing machine. The five parameters for the modified Ramberg-Osgood equation were determined by fitting to the experimental stress-strain data using a least-squares fit. The compressive stress-strain curves at three different strain rates predicted from the modified Ramberg-Osgood model were compared with the experimental results. It is shown that the compressive stress-strain curves up to the maximum stress can successfully be predicted by the modified Ramberg-Osgood equation. The limitations of the modified Ramberg-Osgood model were discussed.
ACKNOWLEDGMENTS
The third author, Norfazrina Hayati Mohd Yatim (currently on leave from IIUM), wishes to acknowledge the support provided by the International Islamic University Malaysia (IIUM) and by WESCO Scientific Promotion Foundation, Okayama, Japan. Thanks are also due to Professor C. Sato of Tokyo Institute of Technology for his kind advice on a fabrication process for the bulk adhesive sheets with a uniform thickness.
Notes
*defined as the secant modulus at 0.2% strain, **N/A: not available.
Presented in part at the 1st International Conference on Structural Adhesive Bonding (AB2011), Porto, Portugal, 7–8 July 2011.