ASTM E1304 Test for Plane-Strain (Chevron-Notch) Fracture Toughness of Metals

ASTM E1304 test method is used to determine plane-strain (chevron-notch) fracture toughness, KIv or KIvM, of metals. Fracture toughness determined is against a slowly advancing steady-state crack initiated at a chevron-shaped notch and propagating in a chevron-shaped ligament.

  • Average 30% Cost

  • 100% Confidentiality

  • Free, No-obligation

  • 100% Customer



    ASTM E1304 method is used to determine the plane strain fracture toughness of metals. Fracture toughness is a quantitative way of expressing a material’s resistance to crack propagation. In this test, the fracture toughness is relative to a slowly advancing steady-state crack in a neutral environment under severe tensile constraints. When tested, some metals might show a sporadic crack growth in which the crack front remains nearly stationary until a critical load is reached. The crack then becomes unstable and suddenly advances at high speed to the next arrest point. For these materials, plane-strain fracture toughness, KIvj or KIvM, is determined relative to the crack at the points of instability. This test method is used to infer the effects of metallurgical variables such as composition or heat treatment on fracture toughness. It can also be used to establish specifications of acceptance and quality control. 

    Test Procedure:

    In ASTM E1304 method, a load is applied to the mouth of a chevron-notched specimen to induce an opening displacement. The load versus mouth opening displacement is recorded autographically. The slopes of periodic unloading-reloading cycles are used to calculate the crack length. These crack lengths are expressed indirectly as slope ratios. The characteristics of the force versus mouth opening displacement trace depend on the geometry of the specimen, the specimen plasticity during the test, any residual stresses in the specimen, and the crack growth characteristics of the material being tested.

    There are two types of force versus displacement:  (1) smooth behavior and (2) crack jump behavior. 

    KIv is the crack extension resistance to a slowly advancing steady-state crack. Kivj is the crack extension resistance to a sporadically advancing crack. 

    Video 01: Method to measure fracture toughness

    Specimen size:

    The specimen size required for the ASTM E1304 testing increases with the square of the ratio of fracture toughness to yield strength of the material. Therefore, proportional specimen configurations are provided.


    The stress intensity factor (fracture toughness) is reported.


    ASTM E1304 method is used to determine the plane strain fracture toughness of metals. Fracture toughness is a quantitative way of expressing a material’s resistance to crack propagation.


    Core Materials Testing Services


    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

          You ship your sample to us or arrange for us to pick it up.

          STEP 03

          We deliver the test report to your email.

          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


            Let us combine our capabilities to achieve success!!

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