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Surfaces of SPR joints: (a) SPFC-AA joint with 6 mm rivet; (b) AA-SPFC joint with 6 mm rivet; (c) SPFC-AA joint with 7 mm rivet; (d) AA-SPFC joint with 7 mm rivet; (e) SPFC-AA joint with 8 mm rivet; (f) AA-SPFC joint with 8 mm rivet; (g) SPFC-AA joint with 9 mm rivet; (h) AA-SPFC joint with 9 mm rivet.
