Our lab occupies a floor space of 1200 ft2 in the recently renovated Kingsbury Hall (room S211). The building is named after UNH professor Albert Kingsbury, renown tribologist and inventor of the Kingsbury thrust bearing.
The major research equipment in our lab is shared between Professors Gross, Kinsey and Korkolis and includes:
- 100 kN (22 kip) Instron servohydraulic testing machine
- 250 kN (55 kip) MTS servohydraulic testing machine
- 50t Greenerd servopress
- Biaxial tension frame for cruciform specimens
- Tube hydroforming facility
- Sheet hydroforming/bulge testing machine
- Microtensile/microforming stage
- Electromagnetic forming and welding machine
- Digital Image Correlation
- Infrared camera FLIR SC 645
- Lectroetch marking system for circle grid analysis
- Various NI DAQ boards, oscilloscopes, etc
Our computational resources include various workstations (including a Dell PowerEdge 2900III 2 x Intel Quad Core Xeon 3.0GHz server), as well as the following software:
- FEA: Abaqus, Nastran
- Solid modeling: SolidWorks, Mastercam
- Other: Matlab, Fortran, Labview, VIC-2D & -3D, ExaminIR
Also available are lab facilities in Materials Science and Civil Engineering, including:
- Leo 922 Transmission Electron Microscopy which operates at 200kV and incorporates a high-resolution pole piece
- AMRAY 3300FE Scanning Electron Microscopy with PGT Imix-PC microanalysis system
- Four Atomic Force Microscopy devices
- Metallographic equipment + specimen preparation
- Furnaces for heat treatments
- Machine shop with conventional and CNC equipment
- Rapid prototyping system (Dimension SST 768)
- 1 MN (220 kip) and 1.35 MN (300 kip) loading frames available in the Civil Engineering high bay
- Environmental chamber (Envirotherm©) for use with the Instron machine. The maximum temperature is 35°C. The temperature is controlled within ±0.1°C with an Envirotherm© thermostat (model 2408).
100 kN (22 kip) Instron 1350 servohydraulic machine
This is one of the workhorses of the lab, used for uniaxial tension/compression, bending and fatigue testing, as well as for structural testing on components and assemblies. The capacity of the machine is 100-kN (22-kips) and the maximum speed is 25-mm/sec. Various load cells and extensometers are available to cover the entire capacity of the machine.
250 kN (55 kip) MTS biaxial servohydraulic machine
This machine is coupled to a 690 bar (10,000 psi) pressure intensifier and it is capable for either uniaxial or biaxial experiments on tubes (axial load and internal pressure). The biaxial experiments can be used for constitutive identification, formability and path-dependence studies.
50 ton Greenerd Servopress
This is a double action 4-post press, suitable for Nakajima and Marciniak testing of sheets, as well as experiments investigating hole expansion (flat & conical punch), springback, etc. It can also be used for a variety of industrial sheet metal forming processes (deep drawing etc). Pressure, displacement, and load transducers are integrated in the press for control and data acquisition purposes. The hydraulic system consists of a 11.2-kW (15-HP) motor, a 32.4-l/min (8.57-GPM) axial piston pump, a 125-l (33-gallon) reservoir, a five station manifold, high pressure filter, and a cooling circuit. Rexroth proportional valves are available to control the machines.
Biaxial tension frame for cruciform specimens
This is a frame developed in-house, which uses cruciform specimens to investigate biaxial loading histories on sheets, including constitutive identification, formability etc.
Tube Hydroforming Machine
This machine is designed and fabricated in-house, to hydroform tubes of up to 63.5-mm (2.5-in) diameter and 30.5-mm (12-in) length, using up to 690 bar (10,000) internal pressure. The machine can be used in conjunction with the Greenerd hydraulic press.
Sheet hydroforming/bulge testing machine
This device is rated for 10,000 psi and can bulge sheets of 127 mm (5 inches) diameter and up to 2 mm thickness. It can be used to perform mechanical testing on sheets, as well as for sheet hydroforming experiments. It is being built by a team of 3 UNH undergraduates for their senior design project (AY 2011-12).
This device is used for experiments in the microscale, including tension, compression, 3 point bending etc. Electric current can be applied before or during these tests.
For Digital Image Correlation measurements, an Olympus stereomicroscope system was purchased in the summer of 2011:
(Images courtesy of Correlated Solutions, Inc.)
Electromagnetic Forming Machine
Dimension SST 768 Rapid Prototyping Machine
Lectroetch Marking System for circle grid analysis
This system is used to in the lab for applying grid patterns to specimens. A current is passed through an electrolite, the grid pattern, and the specimen. A electro-chemical reaction causes the pattern to be permanently etched onto the surfice of the specimen. The roller in the top right is used to apply markings to sheets, while the 10"x10" marking bench is used for rolling markings onto tubes.
Digital Image Correlation
This is a full field strain mapping system from Correlated Solutions, Inc. It can be used to study the strain fields and their evolution inside a gage length of any specimen (uniaxial tension coupon, cruciform, inflated tube, hemispherical dome etc). The sets of cameras available include four 2 Megapixel cameras, as well as high speed cameras (2000 frames/sec with 512 x 512 pixel resolution). Accessories for the system include 17-mm, 35-mm and 75-mm lenses, lighting, tripods, etc.
FLIR SC 645 Infrared Camera
This camera offers full field temperature measurements, up to 650°C with a 640x480 resolution at 25 Hz.
The following images were captured with a FLIR SC645 infrared camera during testing of a SS-304 tensile specimen at a strain-rate of 10-3 s-1. Temp in °C.
Kingsbury Machine Shop
A fully equipped machine shop, including both conventional and CNC machines, is available.