Study on the Failure of the Bolted Flange Connection Structure between Stages of Missiles (Rockets) under Transverse Impact Load

Table 2

The material parameters in the FEM.

Material name	Density ()	Young’s modulus ()	Poison ratio	Plastic stress ()	Plastic strain	Fracture strain	Revolution displacement
Aluminum alloy	2.7E-9	70000	0.3	300	0	0.05	1.0
				370	0.05
Grade 8.8 high strength bolt	7.89E-9	70000	0.3	680	0	0.3	0.5
				800	0.3
Grade 12.9 high strength bolt	7.89E-9	70000	0.3	1080	0	0.3	0.5
				1200	0.3
45# iron	7.9E-9	210000	0.3	355	0	0.1	1.0
				600	0.1
Shear pin	7.89E-9	211000	0.3	1256	0	0.1	1.0
				1560	0.1