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. 2016 Dec 30;10(1):23.
doi: 10.3390/ma10010023.

Determination of Material Strengths by Hydraulic Bulge Test

Hankui Wang  1 , Tong Xu  2 , Binan Shou  3
Affiliations

Determination of Material Strengths by Hydraulic Bulge Test

Hankui Wang et al. Materials (Basel). .

Abstract

The hydraulic bulge test (HBT) method is proposed to determine material tensile strengths. The basic idea of HBT is similar to the small punch test (SPT), but inspired by the manufacturing process of rupture discs-high-pressure hydraulic oil is used instead of punch to cause specimen deformation. Compared with SPT method, the HBT method can avoid some of influence factors, such as punch dimension, punch material, and the friction between punch and specimen. A calculation procedure that is entirely based on theoretical derivation is proposed for estimate yield strength and ultimate tensile strength. Both conventional tensile tests and hydraulic bulge tests were carried out for several ferrous alloys, and the results showed that hydraulic bulge test results are reliable and accurate.

Keywords: hydraulic bulge test; mechanical properties; small specimen.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Specimen for hydraulic bulge test.
Figure 2
Figure 2
The hydraulic bulge test device.
Figure 3
Figure 3
Fixtures: 1 base, 2 cap, 4 upper fixture, 5 handle, 6 oil channel, 7 oil inlet, 8 steel bar, 9 steel bar marker, 10 camera, 11 impact absorber, 100 O-ring seal.
Figure 4
Figure 4
Pressure-displacement curves of hydraulic bulge test (HBT).
Figure 5
Figure 5
The mechanical model for yield strength. (a) Load diagram; (b) Theoretical model.
Figure 6
Figure 6
The mechanical model for ultimate tensile strength.
Figure 7
Figure 7
The stainless-steel specimen section at 100 MPa.
Figure 8
Figure 8
The pressure-displacement curve of Q345R and S30408.
Figure 9
Figure 9
The cross sections of the specimens (S30408, 188, 198 and 200 MPa).
Figure 10
Figure 10
The estimation for (a) yield stress and (b) ultimate tensile strength of S30408.
Figure 11
Figure 11
The estimation for (a) yield stress and (b) ultimate tensile strength of Q345R.
Figure 12
Figure 12
Comparing the results from HBT with conventional tensile test.
Figure 13
Figure 13
The HBT curves of four different materials.
See this image and copyright information in PMC

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