Experimental-computational approach to investigate compressive strength of magnesium phosphate cement with nanoindentation and finite element analysis

摘要

This paper presented an experimental-computational approach to investigate compressive strength of magnesium phosphate cement (MPC) with nanoindentation technique and finite element analysis. Firstly, the compressive strength, macroscopic elastic modulus, porosity, microscopic elastic modulus, chemical compositions and contents of the MPC were tested by press, MIP, nanoindentation, XRD and SEM-EDS. Secondly, the microscopic elastic modulus of magnesium potassium phosphate hexahydrate (MKP) and magnesium oxide (MgO) as the components of the MPC were calculated by homogenization method. Then, the MPC was scanned by X-ray Computed Tomography (X-CT) to obtain the 3D structure adopted as the finite element model. Finally, the input parameters of the model were calibrated based on the results of homogenization and the modified constitutive relations to simulate the uniaxial compression test of the MPC. It was found that the simulated load-displacement results were in good agreement with the experimental results. (C) 2018 Elsevier Ltd. All rights reserved.