Archive for the ‘ASTM D638 Type I’ Category

Tensilkut: Tensile Sample Preparation Gold Standard

September 5, 2017

Tensilkut has the capacity to accurately machine tensile specimens from ferrous and non-ferrous metals and non-metallics from .002″ thickness up to .250″ or more, depending upon the model of the machine and the hardness of the material.  The Tensilkut series is fast; test specimen preparation can be completed in as little as 3 minutes, depending upon the material and its thickness.  The machined edges are so finely finished that no hand finishing is required.  The capacity to satisfactorily machine such light gauges as .002″ thick allows testing of many materials for which specimen preparation would otherwise be significantly more difficult.

Tensilkut test bars

Some of the bars cut on Tensilkut machines include ASTM D638 Type I tensile bars, ASTM D412 Die C tensile bars, ASTM D1855 Type L Tensile-Impact specimens, ASTM D256 Impact specimens, and ASTM D5379 Shear Test Specimens.

pipe wall tensile sample

sample cut from large diameter pipe wall

Visit our website for more information on Tensilkut equipment to solve your flat sample preparation needs.

 

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The Original Tensile Sample Preparation Solution

August 29, 2017

The Tensilkut I is the original machine designed to prepare tensile and other test specimens from a wide variety of materials.  This precision machine is based on the unique concept of utilizing super high cutter rotation speeds to achieve dramatic reductions in chip load and cutting pressures; the Tensi8lbit produces 1000 cuts per second with the individual chips becoming fine shavings.  This high speed shearing action eliminates cold working or heat induced distortion to the sample edges.  Precise test specimens can be Tensilkut milled form aluminum, steel, stainless, titanium, pliable plastics, glass filled laminates, and a wide variety of other materials.  The configuration of the specimens is traced from a precision master template to achieve contoru duplication to with plus or minus .001″ (.025mm).

Dogbone sample cutter Tensilkut

10-68 Tensilkut I for preparation of flat tensile specimens

Contact us or visit our website for more information.

Composite Tensile Test Sample Preparation

August 2, 2017

Recently, a customer sent us some composite strips to be cut into ASTM D638 Type I tensile samples.  We used the Tensilkut II, and the process was very fast and easy.

Tensilkut machines are sized for location in your testing laboratory, to be used by technicians without machining experience.  The Tensilkut II is a floor model, manually operated machine; table model Tensilkut I machines are also available for labs with less space available.  Visit our website at www.tensilkut.com or fill out the contact form below for more information on how Tensilkut can make your tensile specimen preparation easier!

Tensilkut II

July 24, 2017

The Tensilkut II is an efficient, cost effective way to prepare tensile samples.  Recently, we cut some specimens from fiber filled composites for demonstration; the attached video shows the cutting of two ASTM D638 Type I tensile bars, from start to finish, in about 8 minutes.

This video also shows measuring of the specimen during the cutting process, which is not necessary with a properly adjusted Tensilkut machine and master template, but does demonstrate the accuracy of the system.  Tensilkut machines are designed to be operated by lab personnel without previous machining experience.  Please contact us today for further information on how we can help you with your testing program.

Tensilsaw for Fiber Reinforced Plastic Strips

July 17, 2017

New on YouTube: the video demonstration of the Tensilsaw being used to prepare strips of fiber reinforced plastic from 12″ square plaques.  The material saws quickly and easily, with minimal operator training.

After t

he strips have been prepared, they can be used for flexural testing, or any test requiring a straight strip.  Alternatively, and frequently, the Tensilsaw is used to cut blanks for insertion into the template, to be cut using the Tensilkut II or Tensilkut I into tensile bars.  A common specimen to be prepared in this manner is ASTM D638, or ASTM D695 tensile bars.  Another use for such strips would be for insertion into the V-Mill template, to be notched for Iosipescu shear testing in accordance with ASTM D7078 or ASTM D5379.

Demonstration of the Tensilkut II

June 23, 2015

The Tensilkut II is used to easily prepare flat tensile, compression, flexural and other specimens from metals and non-metallics.  This machine is designed for operation in the testing lab by technicians without previous machining experience.

The starting blank is inserted into the Tensilkut Master Template, and the clamping screws are tightened as shown in this video.  The micrometer dial on the Tensilkut control head is set to its starting position, and a series of light passes are taken to cut the material from each side of the specimen.  When the correct tensile specimen dimensions are achieved, the micrometer dial will stop turning, thus preventing cutting an undersized test specimen.  After removing the completed ASTM E8 or other specimen from the master template, the tensile bar is ready for immediate testing.

ASTM D638 Type I Tensile Specimens

May 7, 2015

ASTM D638 Type I is likely the most commonly used tensile specification for the testing of plastics.  Tensilkut Engineering manufactures templates for use with each model Tensilkut I and Tensilkut II for preparing these test coupons.

Tensilkut Master Templates for ASTM D638 Type I: 50-44, 50-46, 50-48

Tensilkut Master Templates for ASTM D638 Type I: 50-44, 50-46, 50-48

50-48

50-46 Tensilkut Master Template

50-46 Tensilkut Master Template

50-44 Tensilkut Master Template

50-44 Tensilkut Master Template

Cutting Specimens from Plaques

March 31, 2015

Some customers wish to cut specimens from plaques, using the CNC Tensilkut III, without first cutting the pieces into strips. This unit can be designed to do just that.

The machine is programmed to cut the specimens you need in the layout you desire. All clamps are custom made, and, as shown in this photograph, this plaque will be cut into ASTM D638 Type I specimens, cutting the entire length of each bar.

Plaque to be cut with CNC Tensilkut III

Plaque to be cut with CNC Tensilkut III

Often, a plaque which is to be cut into all tensile bars is sawn into strips using the Tensilsaw before the pieces are clamped into the machine. More commonly, when a customer wishes to cut specimens from a plaque, he wants several types of specimens, including tensile, flexural and impact blanks.

Although this can be done for thin plaques of metal, it is not recommended, as the cutting time is significantly longer, and the cutter wear will be much greater. Using the Tensilshear to cut metal strips to be clamped in the CNC Tensilkut III is much more efficient.