PSI - Issue 39

M.A. Sánchez Miranda et al. / Procedia Structural Integrity 39 (2022) 161–172 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Table 1. Main mechanical and physical properties of commercial ABS-PP polymers.

Tensile yield strength (MPa)

Hardness Rockwell R

Glassy temperature ( ° C) -17 -20 108 – 109

Molecular weight (Mw) (g/mol) 250,000 105,250

Main mechanical and physical properties

Density (Kg/m 3 )

Elastic Modulus (GPa)

PP

900 - 2400 1000 - 1200

0.008 – 8.25

12 – 43 30 - 40

20 – 118 68 – 118

ABS

1.8 – 3.2

Table 2. Main mechanical and physical properties of tested polymeric materials.

Tensile yield strength (MPa)

Hardness Rockwell R

Glassy temperature ( ° C)

Molecular weight (Mw) (g/mol)

Main mechanical and physical properties

Density (Kg/m 3 )

Elastic Modulus (GPa)

PP

900 1050

1.3 2.3

30 40

94

-18 108

250,000 105,250

ABS

110

Three different pins have been used by the research group: cylindrical, conical and the “bolt head shape” [ 20 ] , as shown in Figure 1. Only the cylindrical pin was used for the joining of dissimilar polymers ABS – PP, due to its simplicity and mechanical results.

Figure 1. Used pins for friction stir welding of polymers: a) bolt head shape, b)cylindrical and c) conical . Welding boards of dimensions: 4 x 17 x 1.27 cm (width, length and thickness, respectively), were machined from the two thermoplastics in order to carry out butt joints, as shown in Figure 2.

Figure 2. Machined boards of the polymers, ABS and PP, with the corresponding dimensions.