Fracture mechanism and mechanical properties of porous HA/PLCL and HA/PLLA sandwich composite beams

Previously, we have developed a novel porous hydroxyapatite/poly l-lactic-co-caprolactone (HA/PLCL) composite sandwich beam as new scaffold material for bone regeneration. This work presents the study of bending fracture mechanisms and microdamage L-lactic-acid (HA/PLLA) beam, in comparison to previous HA/PLCL beam. Both beams were fabricated using method which single layered between two polymer layers their kind. Three-point tests performed assess mechanical properties, microstructures along with damage examined field emission-scanning electron microscope (FE-SEM). Their crystalline structures thermal properties analyzed Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) analysis, differential scanning calorimetry (DSC) measurements. The then characterized by stepwise crack formations. It was found that HA/PLLA possessed higher compared resulting from stiffness PLLA polymer. PLCL layer showed vast ductile fracture, elongated strips, while surfaces observed on relatively brittle pattern some polymeric pores still visible. Three stages both different locations initiation, indicating materials do affect behavior each