Fig. 1. Tensile specimen with porous structure. (a) Unit body; (b) stretching piece size; (c) porous tensile piece

Fig. 2. SLM manufacturing equipment and principle^[26]

Fig. 3. Tensile specimen after forming. (a) Before cutting; (b) after turning

Fig. 4. Structural parameters of tensile specimens after forming. (a) Internal condition; (b) optical microstructure

Fig. 5. Simulated stress-strain curves of porous structure. (a) BCC; (b) BCCZ; (c) honeycomb; (d) stress nephogram of 70% strain

Fig. 6. Simulated tensile strength of porous structure and its fitting curves with porosity. (a) Simulated tensile strength; (b) fitting curves

Fig. 7. Experimental stress-strain curves of porous structure. (a) BCC; (b) BCCZ; (c) honeycomb

Fig. 8. Mechanical properties of porous structure with different porosity. (a) Experimental tensile strength; (b) experimental yield strength; (c) experimental modulus of elasticity; (d) experimental tensile strength fitting curves; (e) specific strength

Fig. 9. Fracture position of porous tensile specimen. (a) BCC; (b) BCCZ; (c) honeycomb

Fig. 10. Fracture morphology of porous tensile specimen. (a)(b)(c) BCC-20%; (d) BCCZ-50%; (e)(f) BCC-50%

Fig. 11. Stress-strain curves of porous tensile parts under different conditions. (a) (b) BCC; (c) (d) BCCZ; (e) (f) honeycomb

Fig. 12. Connective sections of porous structures. (a) Minimum cross section; (b) cross section variation; (c) fitting curves of cross section variation