Issue 52

H. Ghahramanzadeh Asl et alii, Frattura ed Integrità Strutturale, 52 (2020) 9-24; DOI: 10.3221/IGF-ESIS.52.02 12 Weld™ Epoxy Adhesives DP460NS (3M, 2017). Tab. 1 presents material properties. SLJ geometry for the ASTM D1002 [26] test is given in Fig. 1. Material E (GPa) ν Tensile Strength (MPa) AL 7075 T7 72 0.33 500 SAE 304 193 0.29 505 DP460NS 2.13 0.41 46 Table 1: Mechanical properties of Al-7075 T7, SAE 304 [27] and the DP 460NS [12] SLJs have been tested by using the Instron 8801 testing system (Fig. 2) for each strain rate. ASTM D1002 suggests testing shear strength of metal-metal SLJs by using 1.3 mm/min (±0.3mm/min) crosshead speed. For 1, 10, 25 and 50 mm/min displacement rates and material combinations, 6 repeats have been performed. From those repeats for some displacement rates for SS joints, at most one result ignored, which was considered wrong, to ensure consistent calculations. Those repeated force-displacement curves have been fitted by using linear regression approach. To sake of simplicity, material and strain rate combinations were coded and presented as Tab. 2. Speed Material 1 mm/min 10 mm/min 25 mm/min 50 mm/min Aluminum AA-1 AA-10 AA-25 AA-50 Steel SS-1 SS-10 SS-25 SS-50 Aluminum-Steel AS-1 AS-10 AS-25 AS-50 Table 2: Test group names. Figure 2: SLJ sample placement at Instron 8801 test machine