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N.G.K. Metals Corp.


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Tensile Testing

Testing Specimens, Fasteners, Tubing, Re-bar, Welds & Castings

Tensile testing is a destructive test process used to provide information about the strength and ductility of a material or to meet acceptance test requirements. The tensile test or tension test 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 testTensile strength
  • Yield strength
  • Ductility or stiffness

At Laboratory Testing Inc., tensile test equipment is available for both metals and polymers, and for evaluating high performance materials at elevated temperatures such as nickel alloys destined for jet engines and power generation gas turbines, and for steel and other materials used in high temperature service. The various test machines have maximum load capacities of 100 pounds on up to 600,000 pounds to test the smallest fasteners or huge bolts.

Range of Tensile Testing Capabilities

  • Wedge & axial tensile
  • Full-size yield strength of fasteners
  • Machined specimens
  • Full-size tubing
  • Full-size re-bar
  • Elevated temperature tensile testing to 1800°F
  • Tensile testing of welds and castings

Tensile testing s performed in accordance with a range of specifications, as listed below. All types of tensile specimens are prepared to specification in our Machine Shop for tensile testing performed at LTI or for direct purchase by our customers.

The Tensile Test Process

Tensile testing can be carried out on various test samples including machined specimens, fasteners and bolts. The 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 stretch the specimen. The force on the specimen and its displacement is continuously monitored and plotted on a stress-strain curve until failure.

elevated_temperature_tensile_testElevated 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 the test performed.

Tensile testing generates data that is used to determine tensile strength, yield strength and ductility, as expressed by percent elongation or reduction in area.

  • Tensile strength is defined as the maximum load divided by the original cross-sectional area of the test sample or the maximum tensile stress carried by the specimen.
  • Yield strength is related to the load at which time permanent (plastic) deformation or yielding is observed to begin.
  • Ductility measurements are typically elongation, defined as the strain at the point of fracture, and reduction in area at the point of fracture of the test sample.
  • Ultimate strength or UTS is the highest stress achieved before the specimen breaks and is typically recorded in the results.

These measurements are calculated by the technician after the test specimen has broken. The test sample 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.

LTI Capabilities

  • 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 or elongation to failure
  • Equipment Capacity – up to 600,000 lb. load
  • Specimen Preparation – round and flat tensile specimens prepared at LTI

Tensile test to 600,000 lbs.Test Methods/Specifications

  • ASTM A370
  • ASTM B557
  • ASTM E8
  • ASTM E21
  • NASM-1312-8
  • EN 2002-1
  • EN 10002-1
  • ISO 6892-1

Fastener Testing

  • ASTM A962
  • ASTM F606
  • ASTM F835
  • ISO 898-1
  • ISO 898-2
  • SAE J429
  • SAE J995