Wednesday, 15 June 2016

2D Strain Mapping Using A Video Extensometer



Tinius Olsen's  2D strain mapping option software is available for existing and new video extensometer installations for use with the Standard and Advanced software products. 2D strain mapping is used to give a graphical representation of the strain amounts varying across a specimen during a test, illustrating the non-uniform strain taking place. 



Pictured strain map of a tensile specimen at break

Typically users take these pictures and include them in report analysis and conclusions alongside standard results and graphs adding to the data and overall analysis of a material or components performance under load.

Check out this clip of a flexural specimen under test and strain mapped;
video
 

Monday, 16 May 2016

Closed Loop Brinell Hardness Test – Does not require a clamp



I often get asked “Why do your large Brinell hardness testers not have a clamp option” The answer begins with understanding why old technology Brinell testers had and required a clamp feature. They were dead weight machines i.e. the load (in the case of regular Brinell 3000kg) was applied using actual physical weights hanging inside the machine. If a work piece or component was not clamped it could move as the weight was applied thus resulting in an indentation in the metal which could be less than the true size due to the movement. So A clamp was used to pre clamp the work piece or component thus stopping it from moving as the load was applied ensuring a true sized indentation.

However a modern closed loop Brinell tester like the Tinius Olsen models FH-009, FH-008, FH-012 do not use dead weights, this means clamping of the work piece is not required. This is because the closed loop system sampling and applying the 3000kg force ensures, very accurately, that the tester keeps pushing, keeps applying the force until the true 3000kgf is reached. So even if the work piece moves the tester keeps applying the force thus obtaining a true indent at 3000kgf.

See Clip with no clamp

video


Clip with Clamp

video


Same hardness tester exactly the same results.

This means modern Brinell testers are more efficient to use as clamping is not required and importantly they easily handle irregular shaped components which in the past would have been difficult to clamp.

Check out the TO Brinell for yourself click here  

Saturday, 19 March 2016

This Vickers Tester Does Not Save YOU Money It Makes You Money.



Tinius Olsen’s New model FH-6 Micro Vickers, Vickers and Micro Brinell hardness testing capability. It’s an automatic Vickers hardness tester using the turret technology to hold up to two different indenters and four objectives which automatically selected and utilized when test is started.

This technology can help your business make money by increasing the efficiency of your Vickers tests. By using automation it cuts typical testing time in half, more for large pattern tests. And if the pattern tests per sample need to change, for example when testing around weld sites, the time saving is huge. Simply take the stored existing pattern, use it as a template and drag the intended indent points using the mouse or touch screen as required. This tester does not save you money, it makes you money.



FH-6 Material testing machine is capable of performing physical strength test in hardness on raw materials such as metal, plastics, large parts and small precision parts, it is a very versatile unit for the accurate and repeatable analysis of a material or components force and performance. Its 2 button control system allows ultra-fast pre-positioning and scroll wheel that provide control for fine adjustment on the focus positioning. This fine positioning is further enhanced by using a leadscrew rather than an Acme thread screw.

The FH-6 features a large internal touch screen in support of easy test selection and viewing of the hardness profile throughout the test in accordance with ASTM, ISO and JIS for Vickers hardness tests on metals, be it sheet, blocks or complex profile components. There are multiple options for a user to interact with the system to set up and control tests in accordance with ASTM, ISO and JIS (Nadcap) materials testing standard; The innovative Horizon Software allows file storing, image zoom, auto focus, limit setting conversion to other hardness scale, system setup and remote control, patter testing to ensure high reproducibility of test result and limits operator error and interpretation.



Please do explore the interactive FH6 product overview and to learn how this Vickers tester can help the profitability of your Test Lab contact us at Tinius Olsen.

Wednesday, 6 January 2016

Automated Friction "Pinch" testing of Hydrophilic Coatings on Catheters






These days angioplasty, is an endovascular procedure to widen narrowed or obstructed arteries or veins, is almost considered a routine procedure, yet the technology behind it is exacting and subject to rigorous quality and performance control. In this procedure an empty, collapsed balloon, known as a balloon catheter, is passed over a wire into the narrowed locations and then inflated to a fixed size. The balloon forces expansion of the narrowing within the artery or vein and the surrounding muscular wall, opening up the blood vessel for improved flow, and the balloon is then deflated and withdrawn. A stent may, or may not, be inserted at the time of ballooning to ensure the vessel remains open.

Not only are the stents themselves, and the wire used in their construction, tested for tensile strength, compressive strength and stiffness properties, so too are the balloon catheters used to deliver the stent into the body. In recent times, more attention is being paid to the frictional properties of the hydrophilic coating of the catheter’s outer surface must be qualified, known and controlled. At Tinius Olsen we have developed a test system which accurately measures, and records, the frictional forces developed between the catheter and a known surface finish applied at a given and controlled “Pinch” force. The pinch force and surface finish provide the known parameters for each test, so any variation in the measured friction forces is derived from the variation in the catheter surface. 

The test is a cyclic test where the catheter specimen is repeatedly subjected to the pinch force against the known surface finish as shown in the VIDEO CLIP  Click Here . The test is conducted within a saline solution environment which is heated to, and maintained at, body temperature. 

The output from the Tinius Olsen system includes specific results; friction force, time, and the position of the catheter as its cycles through the test process. It also produces test graphs that show the catheter’s performance. It is these results and graphs which qualify the quality and capability of the catheter’s surface coating.



Tinius Olsen systems can be configured to test the mechanical quality and performance of a wide range of medical devices subjecting them to tensile, compression, bending, shear, torsional, impact and hardness tests.