Experimental and modeling stress concentration factor (SCF) of a tension poly lactic acid (PLA) plate with two circular holes

Abstract

The design of high performance aircraft structures frequently includes various shape and size discontinuities for various purposes. The zones near to these notches become critical regions under various working loading. The stress concentration factor (SCF) and tensile strength degradation of poly lactic acid (PLA) plates are addressed in the current study through a combination of experimental and numerical studies using finite element (FE) modeling techniques. The present work performs stress concentration factor (SCF) of rectangular plates with two symmetrical circular holes under uniaxial tension load of two various types (PLA, PLA/15%carbon), which were determined in the current work experimentally and numerically using finite element method with help of Ansys software. The results of experimental test showed decay in tensile modulus and tensile strength is less than that of using plates without holes by (10%, 22.1%) for (PLA, PLA/15%carbon) respectively, and the apparent stress concentration factor is (3.33, 3.61) respectively. And showed decay in tensile strength is less than that of using plates without holes by (28.35%, 27.77%) for (PLA, PLA/15%carbon) respectively, due to the concentration of stresses around the holes. A finite element analysis is carried out and the outcomes have been estimated with experimental results for checking the efficient use of this article. The numerical results show the Von Mises stress distribution and stress concentration factor is (2.16, 2.35) for (PLA, PLA/15%carbon) respectively.

Polylactide and its Composites on Various Scales of Hardness

“…% of titanium filler on the Brinell 10 mm Standard 3000 kgf Scale (i.e., 254 BRH) relates well with the value obtained from experiments on a Brinell scale of hardness (i.e., 265 BRH) when PLA was reinforced with 15 wt. % of carbon (Mohan et al, 2019). Although several studies did not state, in particular, the type of Rockwell scale of hardness used, the values of Rockwell B-scale, Rockwell Superficial 15T Scale and Rockwell Superficial 30T Scale obtained in this work form a close range with the experimental values obtained for annealed PLA (Farah et al, 2016).…”

Polylactide and its Composites on Various Scales of Hardness

“…% of titanium filler on the Brinell 10 mm Standard 3000 kgf Scale (i.e., 254 BRH) relates well with the value obtained from experiments on a Brinell scale of hardness (i.e., 265 BRH) when PLA was reinforced with 15 wt. % of carbon (Mohan et al, 2019). Although several studies did not state, in particular, the type of Rockwell scale of hardness used, the values of Rockwell B-scale, Rockwell Superficial 15T Scale and Rockwell Superficial 30T Scale obtained in this work form a close range with the experimental values obtained for annealed PLA (Farah et al, 2016).…”