© 2018 by Ahmadreza Jahadakbar

Facilities

​Dynamic and Smart Systems Laboratory

 

The laboratory is a state-of-the-art facility for the development and characterization of smart material systems. A range of experimental devices provides the capability to perform comparative testing for shape memory alloy actuators. The devices that will be used for the proposed research are:

2D and 3D Digital Image Correlation (DIC) system for full-field measurements of strain
  • Our DIC system is equipped with two cameras, and VIC-3D software that enables us for 2D and 3D imaging, and analysis of strains and displacement for up to 140 frames per second images. DIC enables us to record full-field strain evolution during loading and unloading samples and provides us the capability of average and local strain analyses. We are able to utilize our DIC system for surfaces as small as 5X5 mm. 

Axial Torsion Bose 3300 ElectroForce with environmental (temperature control) chamber
  • Performing experimental studies of material and device in temperatures between 150 °C to 350 °C

  • For a variety of tests that include ASTM and ISO standards tests for medical devices, materials characterization, and long-term durability studies

  • Static to 100 Hz performance with a load envelope of ±3000 N

  • Versatile performance for a variety of test applications such as durability testing of orthopaedic implant devices

  • Dynamic characterization of materials and components

Phenix PXM for Additive Manufacturing by Laser Melting

We have extensive experience in additive manufacturing of metal parts by Laser Sintering. Laser Sintering initially arose from rapid prototyping. However, Laser Sintering is breaking into other domains among the fabrication of prototypes and models by now. As an innovative freeform fabrication method, Laser Sintering is predestinated for the direct production of complex metal parts. By adding material in layers instead of removing material, Laser Sintering provides potential for the production of complex parts with internal features which may not be produced by any other method. Furthermore, no tools besides a laser are required for Laser Sintering. That's why Laser Sintering provides an economic and rapid method for the production of small batches and even for single parts! Today, Laser Sintering can be applied for the production of ready-to-use parts or components not only in the fields of industrial, automotive and aerospace but for medical and dental devices, too.

Laser Sintering starts with a powder material (typical particle size < 45 µm) and a CAD model of the later part. This model has to be sliced into several layers (typical layer thickness: 30 µm). Every layer contains specific information about the part’s geometry. The Laser Sintering procedure is a cyclic process of three steps:

  • deposition of a thin powder layer (30 µm),

  • a laser locally heats up the powder above the melting temperature according to the geometry information of the part. After solidification the molten regions remain as a solid material surrounded by lose powder.

  • movement of the pistons for providing powder for the next layer and for lowering the sintering platform.

The Lab has available a Laser Sinter system of type Phenix PXM. This system is equipped with a 300 W Ytterbium fiber-laser (cw, l = 1070 nm, Æfocus ≈ 100 µm, TEM00). The operation range is 140*140*100 mm. Each process is carried out in Nitrogen or Argon to avoid oxidation of the material. With this system we mainly process materials like Nitinol, stainless steels, Titanium and Ti-alloys.

 

EnvisionTEC ULTRA for Additive Manufacturing of Polymers
  • Selectively Photocure) technology to quickly 3D print highly accurate parts from STL files

  • A single material is used for both build and support

  • Easily removable partially cured perforated supports

  • Layerless technology with no stair-stepping on inner and outer surfaces

 

Techne FB-08 Series Precision Fluidized Baths
  • Exceptional temperature stability and uniformity for heat treatment of Nitinol and platinum device

  • 50 °C to 700°C (122-1292°F), PID temperature control and a built-in dust extraction and collection system

Numerical Analysis of Medical Devices
  • Shape Memory and Superelastic behavior Nitinol Devices

  • Coupled finite element modeling of thermo-mechanical

  • Proportional and non-proportional thermo-mechanical loadings

  • Bode and tissue device interaction modeling

Micro-Epsilon Compact high-speed thermoIMAGER TIM
  • Measuring ranges (°C): -20 to 100 | 0 to 250 | 250 to 900

  • Optical resolution 160x120 Pixel

  • Spectral range 7.5 to 13µm

  • Excellent thermal sensitivity of 0.08K

  • Exchangeable lenses with 6°FOV, 23°FOV and 48°FOV

  • Real-time thermography with 120 Hz frame rate via USB 2.0 interface

  • Extremely lightweight (250g) and rugged (IP65)

  • Very compact 45x45x62mm

  • Analog input and output, trigger interface