Astm E8 Tensile Specimen Dimensions

adminфевраля 12 2021

Astm E8 Tensile Specimen Dimensions

ASTM E8 is one of two major metals tension testing methods used worldwide to determine yield strength, yield point elongation, tensile strength, elongation, and reduction of area of metal products. It applies to metallic materials in any form, including sheet, plate, wire, rod, bar, pipe, and tube. For each of these specimen types, the standard defines suitable geometries and dimensions, requiring specific gripping solutions that are critical to performing a successful test.

Standard Tensile Test Specimen Dimensions
Astm E8 Tensile Specimen Dimensions Pdf
Astm E8 Tensile Specimen Dimensions Chart
Tensile Test Specimen Size

You can probably obtain sub-size tensile specimens for tensile testing in accordance with ASTM E8. Based on what you reported regarding a CT specimen, and attempting to remove standard or subsidize tensile specimens, I would not recommend it. ASTM E8 Metal Tensile Testing. Measure and record the specimen dimensions necessary to determine the cross sectional area at its smallest point. The original cross sectional area is used for all engineering stress calculations. Use ink and a scribe or punch to place gage marks on the test specimen at the appropriate gage length.

The most common types of E8 specimens are rectangular and round. For testing rectangular type specimens, the standard gripping solution is a set of mechanical wedge action grips, (manual, pneumatic, or hydraulic) with flat serrated faces. In the case of round specimens, vee serrated or threaded faces can be used, depending on the geometry of the specimen ends. To test fine wires, can be used. These grips distribute the load along an extended section of the wire to avoid specimen failure within the grips or at grip faces (“jaw breaks”). Specimen preparation is a critical part of metals testing, as improper preparation of specimens can yield unsatisfactory test results.

Astm e8/e8m-16a Standard Test Methods for Tension Testing of Metallic Materials 1.1 These test methods cover the tension testing of metallic materials in any form at room temperature, specifically, the methods of determination of yield strength, yield point elongation, tensile strength, elongation, and reduction of area. ASTM D638 is performed by applying a tensile force to a sample specimen and measuring various properties of the specimen under stress. It is conducted on a universal testing machine (also called a tensile testing machine) at tensile rates ranging from 1 to 500 mm/min until the specimen fails (yields or breaks).

Bluehill® Universal Software provides standard functions to perform metals tensile tests easily and accurately, and also includes pre-made methods for the major metals standards, including ASTM E8. For more complex test requirements that require changing the rate at different points or for specific stressing or straining rates, the Bluehill Metals test type allows users to calculate results such as yield point elongation and upper and lower yield as directed by ASTM E8.

A range of are offered for tensile testing of metals. When performing strain measurements such as the strain corresponding to the yield strength, Instron’s 2630 series of axial clip-on extensometers are the traditional solution. The non-contacting Advanced Video Extensometer 2 (AVE 2), allow users to determine the elongation at fracture without exposing the equipment to damage due to the energy released. This non-contacting solution is especially useful for thin foils, on which traditional contacting extensometers cannot be used. Instron’s AutoX750 automatic contacting extensometer is an advanced contacting extensometer that moves automatically and greatly improves test throughput.

The challenges of testing to this standard are:

Strain control
Gripping for varied specimen types

Instron's Solution:

Bluehill Universal contains an automatic loop control strain algorithm that allows for strain control without any setup or gain tuning required. This allows users to obtain excellent strain control on Instron systems with a number of different extensometers quickly and easily
Instron has many gripping solutions for all types of metal specimens, from bar to dog bone to wire and foil specimens.

It is important to review ASTM E8 / E8M – 16a in order to fully understand the test setup, procedure, and results requirements.

For more information on ASTM E8 view our Definitive Guide to ASTM E8/E8M Tension Testing of Metals

Specimens, Fasteners, Tubing, Rebar, Welds & Castings

Tensile Testing of Metals is a destructive test process that provides information about the tensile strength, yield strength and ductility of the material. Laboratory Testing Inc., near Philadelphia, PA in the USA, performs the tensile test in accordance with industry standards and specifications, including ASTM tensile test methods. This process is also known as a tensile strength test or tension test.

Tensile Test Capabilities

Standard Tensile Test Specimen Dimensions

LTI offers tensile testing services for metal materials. A variety of equipment models are used to test specimens in all sizes, from small fasteners to large tubing and bolts.

Our tensile testing lab has machines with load capacities from 8 oz. to 600,000 lb. Elevated temperature tensile testing is also offered to 1800°F.

For reliability and fast turnaround, all types of tensile test specimens are prepared to specification in our own Machine Shop. Specimens are also available to customers for direct purchase.

A certified test report is provided with each order and includes complete test results.

Range of Tensile Testing Capabilities

Wedge & axial tensile
Full-size yield strength of fasteners
Testing of machined specimens
Full-size tubing
Full-size rebar
Elevated temperature tensile testing
Tensile testing of welds and castings

Test Methods/Specifications

ASTM A370
ASTM B557
ASTM D638
ASTM E8
ASTM E21
EN 2002-1
EN 10002-1
ISO 527-1
ISO 6892-1

Astm E8 Tensile Specimen Dimensions Pdf

Fastener Testing

ASTM A962
ASTM F606
ASTM F835
ISO 898-1
ISO 898-2
NASM-1312-8 (Formerly MIL-STD-1312-8)
SAE J429
SAE J995

Tell us your specifications for tensile testing and we will provide a fast quote.

The Tensile Test Process

Material strength testing, using the tensile or tension test method, involves applying an ever-increasing load to a test sample up to the point of failure. The process creates a stress/strain curve showing how the material reacts throughout the tensile test. The data generated during tensile testing is used to determine mechanical properties of materials and provides the following quantitative measurements:

Tensile strength,also known as Ultimate Tensile Strength (UTS), is the maximum tensile stress carried by the specimen, defined as the maximum load divided by the original cross-sectional area of the test sample.
Yield strength is the stress at which time permanent (plastic) deformation or yielding is observed to begin.
Ductility measurements are typically elongation, defined as the strain at, or after, the point of fracture, and reduction of area after the fracture of the test sample.

The test sample is securely held by top and bottom grips attached to the tensile or universal testing machine. During the tension test, the grips are moved apart at a constant rate to pull and stretch the specimen. The force on the specimen and its displacement is continuously monitored and plotted on a stress-strain curve until failure.

The measurements, tensile strength, yield strength and ductility, are calculated by the technician after the tensile test specimen has broken. The test specimen is put back together to measure the final length, then this measurement is compared to the pre-test or original length to obtain elongation. The original cross section measurement is also compared to the final cross section to obtain reduction in area.

Elevated Temperature Tensile Testing is a proven method of evaluating the behavior of materials under a combination of heat and tension. When performing an elevated temperature tensile test, the specimen is placed inside a furnace on our test carousel, which is capable of processing up to three specimens at a time. Our computer-controlled system heats the specimen to the required temperature, then allows it to soak. Next, the specimen is loaded into the test frame, where an extensometer in the latest design measures the strain on the specimen as the load is increased.
Watch how the test is performed.

Astm E8 Tensile Specimen Dimensions Chart

Summary of Capabilities

Tensile Test Specimen Size

Types of Tensile Testing – full-size tubing, rebar, fasteners; wedge & axial; yield strength; elevated temperature; weld and casting
Tensile Profile – tensile strength test, yield strength, ductility and elongation
Equipment Capacity – from 8 oz. to 600,000 lb. load
Materials Tested – metals
Specimen Preparation – round and flat tensile specimens prepared by LTI’s Machine Shop