The effect of loading rate on the interfacial behavior of overmolded hybrid fiber reinforced polypropylene composites

Abstract

In the present work, the interfacial behavior of overmolded hybrid fiber reinforced polypropylene composites (hybrid composites) under the loading rate of 1, 10, and 100 mm/min are studied by experimental methods. The interfacial mechanical properties of hybrid composites are determined by monotonic and cycle loading-unloading single-lap-shear tests. The experimental results reveal that interfacial shear strength increases with loading rate, while the shear stiffness shows insensitive to loading rate. A regression function is built to describe the variation of interfacial shear strength with loading rate. The cyclic loading-unloading curves of hybrid composites samples indicate that loading rate effects on the interfacial nonlinear behavior of hybrid composites are considered by affecting plastic deformation. In addition, scanning electron microscopy and digital image correlation observations reveal the failure mechanisms of overmolded hybrid composites. The failure behavior of overmolded hybrid composites is mainly CFRT laminate failure for all cases.The evolution of non-uniform strain fields indicates that the fracture of overmolded thermoplastic composites may initiate at the edges and spread out to the far fields.

Improved Cooling Performance of Hydrogel Wound Dressings via Integrating Thermal Conductivity and Heat Storage Capacity for Burn Therapy

“…The adhesive ability resulting from the hydroxyl and ether groups in the PMO-CNT hydrogel was subsequently evaluated by the lap shear test. Due to the energy dissipation during the lap shearing, the observed adhesive strength of the PMO-CNT hydrogel was varied with the strain rates and revealed the maximum of 0.33 ± 0.03 kPa at a rate of 30 mm/min, as shown in Figure h. ,− …”