Electro-Mechanical Single Column Universal Testing Machine QM-5

Summary of Method

Tensile properties are determined by using test pieces from the sample materials to prepare and test the specimen. These specimens can come in many shapes such as the shape of dumbbells, rings or straight pieces of uniform cross-sectional area. Measurements for tensile stress specimens that have to been pre-stressed gives out the tensile stresses elongation, tensile strength, yield point, and ultimate elongation. The cross-sectional area of a specimen provides tensile stress, yield point, and tensile strength.

Specimens

Dumbbell Specimens (D412)

Test specimens shall be injection molded or cut from a flat sheet not less than 1.3 mm (0.05 in.) no more than 3.3 mm (0.13 in.) thick and of a size which will permit cutting a specimen by one of the standard methods. All specimens shall be cut so that the lengthwise portion of the specimen is parallel to the grain.              

Straight Specimens (D412)

The Straight specimen is only to be prepared if it is not practical to cut either a dumbbell or a ring specimen, to determine the cross sectional area of a straight line specimen in the form of tubes, the mass, length and density of the specimen may be required. The Cross sectional area shall be calculated using A=M/DL.

Ring Specimen (D412)

Two types of cut ring specimens may be used. Unless otherwise specified, the Type 1 ring specimen shall be used.

Rigid and Semi-rigid plastics (D0638)

Type 1 specimen is the preferred specimen and shall be used where sufficient material having a thickness of 7mm (0.28in) or less is available. The Type V specimen shall be used where only limited material having a thickness of 4 mm (0.16 in). The Type III specimen must be used for all materials with a thickness of greater than 7 mm (0.28 in.) but not more than 14 mm (0.55 in.).

Non-Rigid Plastics (D0638)

The Type IV specimen shall be used for testing non-rigid plastics with a thickness of 4 mm (0.16 in.) or less. The Type III specimen must be used for all materials with a thickness greater than 7 mm (0.28 in.) but not more than 14 mm (0.55 in.).

Reinforced Composites (D0638)

Includes highly orthotropic laminates, dimensions shall conform to type I specimen in ASTM D0638

Rigid Tubes (D0638)

A groove shall be machined around this specimen at the center of the length, the groove shall consist of a straight section 57.2 mm (2.25 in.) in length with a radius of 76 mm (3 in.) at each end joining it to the outside diameter. Steel or brass plugs will fit inside the tube and having a length equal to the full jaw length plus 25 mm (1 in.) shall be placed in the ends of the specimens to prevent crushing.

Conditions Required

Unless otherwise specified, the standard temperature for testing shall be 23 ± 2°C (73.4 ± 3.6°F). Specimens shall be conditioned for at least 3 hours when the temperature is 23°C (73.4°F). If the material is affected by moisture, maintain the relative humidity at 50 ± 5 % and condition specimens for at least 24 hours. (ASTM D412)

Condition the test specimens at 23 ± 2°C (73.4 ± 3.6°F) and 50 ± 5 % relative humidity for not less than 40 h prior to test. Reference pre-test conditioning, to settle disagreements, shall apply tolerances of ±1°C (1.8°F) and ±2 % relative humidity. Conduct the tests at 23 ± 2°C (73.4 ± 3.6°F) and 50 ± 5 % relative humidity, unless otherwise specified by contract or the relevant ASTM material specification. Reference testing conditions, to settle disagreements, shall apply tolerances of ±1°C (1.8°F) and ±2 % relative humidity. (ASTM D0638)

Procedure

The specimen is to be placed in the grips of the testing machine, using care to adjust the specimen symmetrically to distribute tension uniformly over the cross section. Determination of the tensile set and set-after-break are all given and calculated after the test, the test result will be the median of three individual test measurement values.

Grip and Load Cell

Each test will require different test grips and accessories for the plastics, metal, biomedical, composite, elastomer, component, automotive, aerospace, textile and other applications industries.

• Tensile Grip
• Compression Grip
• Load Cell