Page 109 - MSAM-4-2

Materials Science in Additive Manufacturing Impact of cell angle on AlSi10Mg structures

to dissipate impact energy and can be utilized to compare the Equation IV:
performance of different porous structures. E
E is obtained by integrating the force-displacement SEA = m a (IV)
a
curve under impact and is expressed as Equation III: 49
d where m is the mass of the sample.
∫
E a = F ( ) ()x dx (III)
0 S is considered to be an important parameter to
p
where F is the force and d(x) is the displacement. characterize the properties of a material and is expressed
as Equation V:
SEA is a normalized measure of the energy absorbed
per unit mass of the porous structures. It is calculated by S = S t (V)
dividing the E by the mass of the sample, as shown in p ρ '
49
a
Table 2. Falling hammer impact test parameters for the laser where S is the specific strength (i.e., strength-to-weight
p
powder bed fusion‑built porous structures ratio), S is the stress of the sample, and ρ’ is the relative
t
Method Quality of the Impact Impact density of the sample.
hammer (kg) energy (J) velocity (m/s)
M1 14.858 41 2.340 3. Results and discussion
M2 14.858 124 4.090 3.1. Microstructure
M3 14.858 248 5.800 As shown in Figure 4, the actual AlSi10Mg porous structures

Table 3. Parameters of the Johnson–Cook fracture criterion for laser powder bed fusion‑built AlSi10Mg

Parameters D1 D2 D3 D4 D5 ρ (kg/m ) E (Gpa) v
3
Value 0.04704 1.155 −0.841 −0.042 0 2680 38 0.3

Figure 3. Diagram illustrates the falling hammer impact test equipment setup, including the hammer, impact specimen, and schematic representation of
the test direction

Volume 4 Issue 2 (2025) 5 doi: 10.36922/MSAM025130019