Abstract
The systematically comparison between small punch test and hydraulic bulge test is carried out, which include specimen geometry, the test device, testing procedure, testing results interpretation. The specimen geometry, test device and testing procedure are three major aspects of the experiments. Both the testing fixtures of SPT and HBT are redesigned to meet the specimen geometry. The testing procedure of SPT is similar to strain-controlled tension test, which control the displacement of the puncher and measure the corresponding reaction load. The testing procedure of HBT is similar to stress-controlled tension test, which control the pressure of the hydraulic oil and measure the displacement of the deformed specimen. The finite element method is used to study the deformation pattern of the specimen. The initial plastic zone distribution is different. The plastic zone of SPT is concentrated in a small area under the puncher and the initial plastic zone is a circle around the corner of the fixture for HBT. The deformation pattern play an important role in the yield stress interpretation, it is suggest that the interpretation method should include the parameters from the testing fixtures for HBT, and radius of the puncher for SPT.
Highlights
Small specimen testing is a technology to get the mechanical properties from a small volume material
Small punch test is one of the most popular small specimen testing techniques which was developed for nuclear power plant in the 1970s to assessment the safety of critical components [1,2]
The different deformation marks indicate that the initial plastic zone is different for HBT and SPT, which indicates that the initiate test curve of HBT is sensitive to the geometry of the fixtures while the curve of SPT is sensitive to the radius of the puncher
Summary
Small specimen testing is a technology to get the mechanical properties from a small volume material. Hydraulic bugle test (short as HBT) is newly developed small specimen test method. HBT and SPT are two type of testing method with some similarity, the idea behind the two testing procedure is exactly the same, which is use something to make the specimen deformation, and get the apply force or pressure and the displacement curve. The rigid puncher is used for SPT to make the specimen deformation while high pressure hydraulic oil is used for HBT to make the specimen deformation. Swansea University and a load frames is needed for SPT to get the load force and corresponding displacement, and a high pressure pump and a specimen holdings is used for HBT to get the hydraulic oil pressure-displacement curve. The finite element analysis is used to explain the fundamental difference
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