Investigation of the mechanical properties of abs-based 3d printed scaffolds by using the software solidworks 2020

Acrylonitrile butadiene styrene (ABS) (chemical formula (C₈H₈)_x·​(C₄H₆)_y·​(C₃H₃N)_z) is a common thermoplastic polymer. Its glass transition temperature is approximately 220 °F (104 °C). ABS is amorphous and therefore has no true melting point.
ABS is a terpolymer made by polymerizing styrene and acrylonitrile in the presence of polybutadiene. The proportions can vary from 15% to 35% acrylonitrile, 5% to 30% butadiene and 40% to 60% styrene. The result is a long chain of polybutadiene crisscrossed with shorter chains of poly(styrene-co-acrylonitrile). The nitrile groups from neighboring chains, being polar, attract each other and bind the chains together, making ABS stronger than pure polystyrene. The acrylonitrile also contributes chemical resistance, fatigue resistance, hardness, and rigidity, while increasing the heat deflection temperature. The styrene gives the plastic a shiny, impervious surface, as well as hardness, rigidity, and improved processing ease. The polybutadiene, a rubbery substance, provides toughness and ductility at low temperatures, at the cost of heat resistance and rigidity.^[3] For the majority of applications, ABS can be used between −20 and 80 °C (−4 and 176 °F), as its mechanical properties vary with temperature.^[5] The properties are created by rubber toughening, where fine particles of elastomer are distributed throughout the rigid matrix.

2.3.2.Porosity measurment
The porosity of the scaffolds (n = 3) was measured by using the
Archimedes’ principle in D.I. H₂O. The porosity was calculated according to the following equation: Porosity=(W_sat–W_dry)/(W_sat–W_sus)×100% Where W_sat stands for the weight of scaffold saturated with water, W_dry is the dry weight of the scaffold, and W_sus represents the weight of the scaffold suspended in water.
2.4. Mechanical testing
The mechanical properties of ABS-based 3D printed scaffolds were simulated by using Solidworks 2020 software. The stress-strain data were converted from the load-displacement data and the compressive modulus was found out from the slope of the stress-strain curve.