Abstract
In this paper, the temperature and pre-crack effects on the delamination resistance of woven glass fibre reinforced polymer (GFRP) sandwich composites under Mode I loading was experimentally investigated and numerically modelled. For this purpose, the sandwich composite panel was fabricated with vacuum assisted resin infusion molding (VARIM). The mechanical properties were obtained at room and high temperature. Double cantilever beam (DCB) test was adopted for the measurement of delamination resistance by evaluating the strain energy release rate (SERR) value to obtain the fracture properties of woven GFRP sandwich composites. The three analytical methods, the experimental compliance calibration method (CCM), Modified Compliance Calibration Method (MCC) and Modified Beam Theory (MBT) have been used. In the finite element analysis virtual crack closure technique (VCCT) was used. The results obtained from 3D finite element analysis for various delamination lengths compare well with the experimental results. It is seen that there is an agreement between experimental and numerical results so that VCCT analysis is to be an appropriate method for analysing a SERR value of sandwich composites. DOI: http://dx.doi.org/10.5755/j01.mech.22.5.16229
Highlights
Nowadays, sandwich composites have been adopted in various areas such as aerospace, marine and automotive sectors due to the constructed with two stiff, strong face sheets and a lightweight, relatively flexible core, and a high bending stiffness and strength per unit weight
The mechanical properties were obtained at room and high temperature
double cantilever beam (DCB) tests showed a negligible increase in critical strain energy release rate (SERR) by increasing the pre-crack length as it is seen in high temperature 60°C
Summary
Sandwich composites have been adopted in various areas such as aerospace, marine and automotive sectors due to the constructed with two stiff, strong face sheets and a lightweight, relatively flexible core, and a high bending stiffness and strength per unit weight. Their fuel efficiency in transportation vehicles, but at present, there is a strong interest in the development and applications of sandwich structures for civil and building material systems [1]. To investigate the fracture behavior of honeycomb sandwich panels containing embedded artificial pre-crack, DCB test geometry was used to get strain energy release rate. The virtual crack closure technique (VCCT) is widely used for computing energy release rates, based on results from continuum (2D) and solid (3D) finite element (FE) analyses, and to supply the mode separation required when using mixed-mode fracture criteria [10, 11]
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