**5. Experimental setup**

A mechanical type-universal test machine (UTM) is obtained for the tension or compression test. UTM is DTU-900MHA and a mechanical type with a digital signal processor (DSP) system as shown in **Figure 4**. For the tension test, **Figure 5** shows experimental setup in the UTM. It shows uniaxial tensile test with specimen made by aluminum ally, AlSi10Mg. **Figure 5(1)** is a specimen before tensile test and **Figure 5(2)** shows a specimen after the tensile test. **Figure 5(2)** shows a circle which means zoom-out as the right figure. The right figure shows a good tested result in the specimen, because it is broken in middle area in the specimen

#### **Figure 4.** *Universal test machine (UTM) with data collector system.*

#### **Figure 5.**

*Uniaxial tensile test with specimen made by aluminum alloy AlSi10Mg. Test speeding is set up as 1 mm/min: (1) shows a specimen before testing; (2) shows a specimen after testing.*

**119**

**Figure 6.**

**Table 3.**

*Research of Lightweight Structures for Sandwich Core Model*

selected for 2–2 specimen because it shows a good fracture.

**Dimensions of standard specimens, sheet-type [mm]**

*Rectangular tension test specimens based on ASTM E8M.*

*strain for all specimens, and (b) Stress-strain for 2-2 specimen.*

stress-strain and true stress-strain for aluminum alloy AlSi10Mg.

as setup with mechanical extensometer. Test speeding in the UTM is setup as

Making a tensile specimen is based on ASTM E8M standard. The specimens were obtained by AlSi10Mg power with the DMSL technique. Each section defined as a letter which shows dimensions on **Table 3**. **Table 3** shows rectangular shape of tension test specimens with detail dimensions like the gauge length, width, thickness, radius of fillet, overall length, length of reduced section, a length of grip section, and an approximate width of grip section. Thus, DMLS made specimens for the tension test. Totally, three samples made by aluminum alloy (AlSi10Mg) marked as 2–1, 2–2, 2–3 were ready for the tension test, and they were tested by uniaxial tensile testing. **Figure 6** shows specimens after tensile test and results with (a) engineering stress-engineering strain for all specimens and (b) stress-strain for 2-2 specimen. As you can see, 2–2 specimen shows clearly that the middle point was broken. Others were broken in an area of top point or bottom point. Thus, tested data were

From the tension test, engineering stress-strain and true stress-strain can be defined as shown in **Figure 6**. **Figure 6** shows a comparison between engineering

Gauge length 50.0 ± 0.10 Thickness 3.0 Radius of fillet, min 12.5 Overall length, min 200 Length of reduced section, min 57 Length of grip section, min 50 Width of grip section, approximate 20

*Stress as a function of Stain for Aluminum alloy specimen after tensile test; (a) Engineering stress - Engineering* 

*DOI: http://dx.doi.org/10.5772/intechopen.86852*

1 mm per a minute.

**6. Tension**

as setup with mechanical extensometer. Test speeding in the UTM is setup as 1 mm per a minute.
