High Strain Rate MTS
The actuator of this MTS tester can move at speeds up to 4 m/s, deforming a specimen at strain rates ranging from quasi-static to 200/s. The maximum load capacity is 22000 N.
Long Split Hopkinson Pressure Bar
This Kolsky bar is designed to characterize materials at intermediate strain rates ranging from 70/s to 500/s. Together with pulse-shaping techniques, this bar can also provide prescribed high-rate loading pulses up to 3 ms long.
Regular Split Hopkinson Pressure Bars (Steel)
Regular Split Hopkinson Pressure Bars (Aluminum)
Depending on the material under investigation, a series of compression Kolsky bars are available to characterize the dynamic behavior of materials from as soft as tissues to as hard as armor ceramics.
Tension and Torsion Hopkinson Bars
The principle of a tension bar or a torsion bar is similar to that of a compression bar except for the loading conditions. Both tension and torsion versions of the Kolsky bar are available.
Multiaxial Compression Hopkinson Bar
This compression bar has a hydrostatic confining chamber over the testing section that can subject the specimen up to 400 MPa pressure before axial impact loading. This capability is important for investigating pressure-sensitive materials.
High Temperature Hopkinson Bar
This automated compression bar can heat a specimen up to 1,000 C, place the sample and loading platens in the testing section, and load the hot specimen with axial stress-wave loading. The entire system is automated for repeatability.
Miniature Tension Bar
The small bar sitting on an optical table is designed to determine the dynamic failure strength of high-performance fibers with diameters in the order of 10 micrometers. It consists of incident bar with a flange, specimen, and load cell. The incident bar is made of aluminum alloy rod with a diameter of 6.35 mm and a length of 1651 mm. The impact tube of aluminum with a length of 101.6 mm is free to slide in the brass tube, which is triggered from a spring system. A fiber specimen at short gage length of 2 mm is connected to the one end of the incident bar by an adhesive. The dynamic stress-strain curve is obtained by measuring strain and force signals which are recorded from the semiconductor strain gage mounted on the incident bar and from the quartz-piezoelectric load cell with a capacity of 22.24 N, respectively.
Fiber Transverse Test Frame
This frame is built to load a single high-performance fiber along the transverse direction. The system includes a piezoelectric translator (LVPZT) traveling up to 15 micrometer, push and supporting rod, and precision vertical translation stage for the proper positioning and alignment. Transverse compressive loading and displacement are measured directly by precision low profile load cell with a capacity of 22.24 N and a capacitive displacement sensor with sub-nanometer resolution, respectively. The effects of longitudinal tensile loading on the transverse stress-strain behavior of the fibers as well as the loading rate effects on the transverse mechanical behavior are fully investigated. These experiments also enable the estimation of the elastic modulus in transverse direction.
Cyclic loading can also be applied.
Cordin 550 High Speed Camera
Cording 550 high speed camera can record 32 frames with up to 2,000,000 frame per second. That means each frame duration is as low as 0.5 micro second. Its rotating mirror operating as high as 12,500 rotation per second enables such high speed photography. The CCD records 1 mega pixel (1000x1000) digital images. The camera can catch the right moment with its trigger delay mechanism. It works with Cordin 694 light source and two flash lamps which supply high intensity light. The cemera is employed to record the deformation and failure of speicmens in Hopkins bar experiments and gas experiments.
Smooth Bore High Speed Gas Gun
The gas gun locates in Bowen Large Scale Laboratory in Civil Engineering in Purdue University. It has 63.5 mm diameter smooth bore and can project 500g object more than 1000 m/s. The tolerance of barrel is within 0.05mm in total 6 m length. With sabots, any types and shapes of objects smaller than 63.5 mm can be projected. Compressed nitrogen or helium as high as 41 MPa is used to operate the gun.
L3 150kV Flash X-Ray System
L-3 150kV Flash X-ray system is being built. The system consists of power source, 4 channel X-ray tubes, films, a digital scanner and a controller. The X-ray penetrates alumium and any soft materials and enbles to investiage the inner failure process of the targets in the impact tests.
Drop-weight Tower
The dynatup is used to conduct conventional drop-weight impact tests.