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Fracture Testing

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    Fracture testing is a test in fracture mechanics to determine the fracture characteristics of materials and structures. Fracture characteristics refer to the characteristics related to crack initiation, propagation, crack arrest and instability in materials or structures, such as brittle transition temperature, crack propagation speed and fracture toughness. The application of fracture mechanics in engineering has been quite common. In order to analyze the fracture of engineering structures, the fracture characteristic data of materials or structures must be obtained through experiments. As a professional reliability third-party testing organization, T, C&A Lab can perform fracture tests on metals, ceramics, rubber and plastic products, textiles and other materials according to ISO, ASTM and other standards.

    T, C&A Lab's fracture test methods include:

    • Three-point bending test

    This is the most widely used in fracture toughness testing. It is named because the specimen is loaded by three-point bending in the test (Figure 1). It is used to measure the stress intensity factor KI, crack opening displacement δ and J integral.

    Fracture Testing Figure 1

    • Compact tensile test

    Compared with other tests with the same testing ability, this kind of test has the smallest volume (compact size). Compact tensile test (Figure 2) has been widely used in the testing of fracture toughness and crack growth rate, especially in the evaluation and research of nuclear pressure vessel materials.

    Fracture Testing Figure 2

    • Drop weight test

    The drop weight test (Figure 3) is a dynamic fracture test, which is a special simply supported beam test. On the tensile surface of the sample, a longitudinal brittle weld bead is surfacing welded, and a transverse cut is sawed on the weld bead. During the test, the sample is cooled to a certain temperature, the hammer head is allowed to fall freely, an impact is made on the sample, and the highest temperature at which the notch on the brittle weld bead of the sample cracks to the edge is measured.

    Fracture-Testing-3.png Figure 3

    • Wide plate test

    The wide plate test is a large-scale laboratory test. In many cases, it can simulate the fracture of the actual welded structure. The most commonly used notched welded wide plate specimens are shown in Figure 4. The pre-made cuts on both sides of the longitudinal weld of the specimen are used to simulate cracks. During the test, a tensile load is applied to the test plate at the required temperature, and the load and strain when the notch reaches cracking are measured.

    Fracture Testing Figure 4

    Standards we test to

    ASTM E399Method for Linear-Elastic Plane-Strain Fracture Toughness of Metallic Materials
    ASTM E1820Standard Test Method for Measurement of Fracture Toughness
    ASTM E1921Method for Determination of Reference Temperature, To, for Ferritic Steels in the Transition Range
    ASTM E2899Method for Measurement of Initiation Toughness in Surface Cracks Under Tension and Bending
    ISO 12135Metallic Materials — Unified Method of Test for the Determination of Quasistatic Fracture Toughness

    In addition, the experts in our Fracture Testing Laboratory also provide a variety of custom tests as you need. Let's discuss the customized service with our experts for free.

    Instruments and data

    Fracture Testing
    Fracture Testing
    Fracture Testing
    Fracture Testing

    References

    1. Urkovi, L.; et al. Flexural Strength of Alumina Ceramics: Weibull Analysis[J]. Transactions of Famena, 2010, 34(1):13-19.
    2. Md Jamil, M. S.; et al. Solid-state self-healing systems: The diffusion of healing agent for healing recovery[J]. Sains Malaysiana, 2015, 44(6):843-852.
    3. Bhaduri A. Impact Loading. In: Mechanical Properties and Working of Metals and Alloys. Springer Series in Materials Science, 2018, vol 264.
    4. Best, J. P.; et al. Small-scale fracture toughness of ceramic thin films: the effects of specimen geometry, ion beam notching and high temperature on chromium nitride toughness evaluation[J]. Philosophical Magazine, 2016:3552-3569.
    5. Dugan, J.; et al. Fracture Toughness Determination with the Use of Miniaturized Specimens. Contact and Fracture Mechanics. 2018.

    Note: this service is for Research Use Only and Not intended for clinical use.

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