Fig.1

Uniaxial tensile specimen (mm)

Fig.2

Uniaxial tensile test system assisted with ultrasonic vibration

Fig.3

Force-displacement curve of uniaxial tensile test without ultrasonic vibration

Fig.4

Engineering stress-engineering strain curves of uniaxial tensile test at different amplitudes

Tab.1

Mechanical properties of 2219-O aluminum at different amplitudes

Fig.5

Hardening equation fitting of material without ultrasonic vibration

Fig.6

Fitting curve of parameters of acoustic softening effect

Tab.2

Material parameters at different amplitudes

Fig.7

β,EC versus ζ

Fig.8

Verification of hardening equation considering acoustic softening effect

Fig.9

Compression test system assisted with ultrasonic vibration

Fig.10

Surface topographies after compressing at different amplitudes

Fig.11

Surface roughness of spicemen at different amplitudes

Fig.12

Schematic of ribbed member auxiliary spinning assisted with ultrasonic vibration

Fig.13

Finite element simulation model of ribbed member spinning

Tab.3

Finite element simulation parameters of ribbed member spinning

Fig.14

Simulation results and measuring positions of height of ribs

Fig.15

Height of ribs at different amplitudes

Fig.16

Stress changes of rib materials at different amplitudes

Fig.17

Comparison of displacement of rib materials in different directions at different amplitudes

Fig.18

Test devices of ribbed member spinning

Fig.19

Ribbed members obtained by test