PSI - Issue 13

Andrzej Kurek et al. / Procedia Structural Integrity 13 (2018) 2210–2215 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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Fig. 6. Shear strain-life curve for 6082-T6 aluminium alloy according to Kandil model fitted using weighted least squares method (Bisquare)

Fig. 7. Shear strain-life curve for 6082-T6 aluminium alloy according to Langer model fitted using weighted least squares method (Bisquare)

Fig. 8. Shear strain-life curve for 6082-T6 aluminium alloy according to Kurek- Łagoda model fitted using weighted least squares method (Bisquare) Table 2. Material constrains and fitting parameters obtained using weighted least squares fitting method (bisquare) 6082-T6 - bisquare a b c d R 2 Kandil -2.788 -0.362 -0.06826 - 0.9502 Langer -1.617 0.2069 -1.99 - 0.9374 Kurek - Łagoda -4.274 -1.123 -0.176 0.00121 0.9757