ASTM E1450-16 Test for Tension Testing of Structural Alloys in Liquid Helium

ASTM E1450-16 Test for Tension Testing of Structural Alloys in Liquid Helium

ASTM E1450-16 covers tensile testing of structural alloys in liquid helium. The format is similar to other Tension Tests except that this test is conducted cryogenically. Cryogenics deals with the effect of very low temperatures. Cryogenic testing requires special apparatus, smaller specimens, and concern for serrated yielding, adiabatic heating, and strain-rate effects.

    Scope:

    ASTM E1450-16 covers a tensile test done in a cryostat, a device used to maintain low cryogenic temperatures. This test is used to measure yield strength, tensile strength, elongation, and reduction of area. Tension tests provide information on the strength and ductility of materials under uniaxial tensile stresses. This information is used for alloy development, comparison and selection of materials, and quality control. 

    Test Procedure:

    The main apparatus includes a tensile cryostat for applying tensile forces to test specimens in cryogenic environments. The dimensions of the specimen are measured. The specimen is installed in the cryostat. To prevent icing, the apparatus is dried with an air jet or heat gun. 

    Cryogens are substances used to produce extremely low temperatures such as liquid helium. Cryogens are stored in a vacuum flask called a cryogenic dewar. In this test, the dewar is positioned on the cryostat and the liquid helium is transferred into the cryostat. The specimen is submerged in the liquid helium until it reaches thermal equilibrium. The testing machine grips the specimen and gradually extends it until it fractures. During this process, the elongation of the gage section is recorded against the applied force. The data is manipulated so that it is not specific to the geometry of the test sample

    Specimen size:

    Usually, A tensile specimen has two shoulders and a gage section between them. The shoulders are bigger so they can be easily gripped and the gage section has a smaller cross-section so that deformation and failure can occur in this area.

    Data:

    1. Tensile strength:

    Su = Pmax  /A

    S= the tensile strength

    Pmax = the maximum load

    2. Yield point: the stress beyond which a material becomes plastic.

     YP  = PYP /A0
     PYP = load at the yield point.

    3. Percentage elongation: The extent to which the test specimen has stretched at failure:

    Elongation = ɛ = (ΔL/L0) x 100

     ΔL: Change in Length

     L0: Initial Length

    4. The percentage reduction of area (%RA): The amount the specimen has necked or reduced in diameter at the point of failure

     

    5. Discontinuous Yielding Stress:

    σ= Yielding stress
    F = maximum force
    A = area

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
        •  

          STEP 01

          You share material and testing requirements with us

        •  

          STEP 02

          We ensure your sample pick-up in an ensured manner

        •  

          STEP 03

          We deliver test report to your inbox

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process

            idea icon
            Want to connect with an expert before you leave?