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  • A suitable mixed mode I/II test specimen for fracture

    1 day ago · However by reducing S 1 value, the curve of mode I goes downward and the curve of mode II geometry factor moves upward such that at a specific S 1 distance (e.g. S 1 = 2.5 mm or S 1 /R = 0.078 for a/H = 0.4) mode I curve stands on zero axis but mode II curve has a non-zero magnitude, in which this situation corresponds to pure mode II loading

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  • Design of loading devices for mixed-mode fatigue crack

    In this thesis, a loading device suitable for mixed-mode I and II fatigue crack propagation tests of a compact tension shear (CTS) specimen has been designed and constructed. Computations of fatigue crack propagation life and maximum applied load to a CTS specimen in order to follow linear elastic fracture mechanics was performed.

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  • FRACTURE MECHANICS FOR COMPOSITES - NASA

    using pure Mode I Double Cantilever Beam (DCB) (G II/G T=0), pure Mode II End Notched Flexure (ENF) (G II/G T=1), and Mixed Mode Bending (MMB) tests of varying ratios. A curve fit of these data is performed to determine a mathematical relationship between G c and G II/G T. Failure is expected when, for a given mixed mode ratio G II /G

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  • Numerical Simulation of Mixed-Mode Fatigue Crack Growth

    Apr 23, 2020 · This work concentrates on the fracture behaviour of the compact tension specimen under mixed-mode loading, and numerical investigation using ANSYS Mechanical APDL 19.2 finite element program with different modes of mix angles is carried out. The prediction of mixed-mode fatigue life under constant amplitude fatigue loading for the compact tension shear specimen (CTS) is employed …

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  • Fracture initiation under pure shear revisited: Remarks on

    Apr 01, 1997 · The present tests and numerical results, using double-edge notched specimen, generate during the en- tire load history pure mode-II conditions. Due to the inhomogeneity of concrete, after mode-II crack initia- tion, its further propagation is arrested and overidden by more critical diagonal shear failure in compression.

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  • Characterization of mixed-mode I/II fracture properties of

    pure mode I tests, although adaptations of the techniques to pure mode II have also been developed (Wang and Williams 1992 ; Blackman et al. 2003, 2005, 2006 ). One goal of this study was to test mixed-mode conditions, but each specimen was partially tested at …

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  • Characterization of mixed-mode I/II fracture properties of

    Mode I: loading occurs the most often and produces the most damage. Because of this, it naturally receives the most attention in research, structural design, failure analysis, etc. It is commonly called the Opening Mode. Mode II: corresponds to shearing of the crack face due to in-plane shear stresses.

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  • NumericalSimulationofMixed-ModeFatigueCrackGrowthfor

    according to the value of the angle from mixed-mode loading (α 15°, 30°, 45°, 60°, and 75°), pure mode II (α 0°), and pure mode I (α 90°). e studied material was alu-minium alloy having an elasticity module of E 74GPa, v 0.33, σ Y 517MPa, tensile strength 579MPa, fracture …

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  • STUDY OF THE FRACTURE BEHAVIOR OF FIBER REINFORCED

    with Mode II of fracture [1]. According to Ayatollahi et al. [2], pure shear loading is defined as a loading condition in which a specimen is subjected to equal and opposite parallel forces with negligible bending. Some researchers [3] do not accept the existence of mode II failure in concrete. It is due to the easy failure of concrete in mode I.

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  • Verification Benchmarks and Validation of MAT261 for High

    Mixed Mode Delamination: Tie-break contact is used between two loading arms that are subjected to three point bend loading to induce a mode II delamination combined with mode I. The load-deflection response is compared to test data for a mixed mode bending (MMB) test. This test ensure the appropriate mixed mode s

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  • A novel test configuration designed for investigating

    Jun 15, 2018 · Fig. 1 shows the new test configuration including the loading fixture and the test specimen proposed for mixed mode II/III fracture experiments. While the specimen in Fig. 1 is under pure mode II loading, the test set up can be subjected to mixed mode II/III loading by rotating the loading disks, as described later. In this simple loading configuration, the uniaxial compressive load of the

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  • Shear fracture (Mode II) of brittle rock | Request PDF

    Nov 03, 2017 · Abstract. This study investigates the rate and path of fatigue crack growth under mixed mode I/II loading in the presence of tensile and compressive stresses. Compact tension shear (CTS) specimens made of 42CrMo4 steel are subjected to pure mode I, …

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  • An Incremental Cohesive Law for Delamination Under a Mixed

    Nov 12, 2020 · where K I, K II and K m are the stiffness used in the cohesive law for pure mode I, mode II and mixed-mode with a mode mixity of B, respectively (see details of the cohesive law definition in the next section).With this modified formulation of the cohesive constitutive law, the dependence of the macro-scale response on the inter-laminar strength can be eliminated but only during the

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  • 3D Mixed-Mode Delamination Fracture Criteria–An

    [5, 6] for pure mode II fracture toughness (GIIc). The mixed-mode bending (MMB) test is an ASTM standard (ASTM D6671) that can measure fracture toughness over a wide range of combinations of Mode I and Mode II loading [7, 8]. For pure mode III, the Edge Crack Torsion Test (ECT) (also a test that ASTM is working to

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  • STRUCTURAL PERFORMANCE OF BAMBOO: CAPACITY …

    result of a mixed-mode shear failure which is influenced by both Mode I tension and Mode II shear failures. The research aimed to understand the mixed-mode shear capacity of full-culm bamboo under four point bending by testing standard span culms with longitudinal notches at midspan and unnotched short span culms.

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  • Patents | NIST

    Shear Loader and Performing Pure Mode II or Mixed Mode I and Mode II Shear Loading. NIST Inventors. Edward Pompa, and . Patent Description The device is a shearing system that is essentially a portion of a large scissors, used to precisely shear a specimen while recording the loads and deformations. It consists of two metallic half­ devices

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  • Characterization of mixed mode crack opening in concrete

    Jun 24, 2011 · In real concrete structures cracks often open in mixed mode after their initiation. To capture the direct material behavior of a mixed mode crack opening a stiff biaxial testing machine, capable of imposing both normal and shear loads on a given crack area, has been applied. The opening and sliding components of the mixed mode displacement are measured using a custom made …

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  • Investigation by Digital Image Correlation of Mixed-Mode I

    Feb 26, 2021 · In particular, when the bottom supports are located symmetrically to the crack line (i.e., when S 1 = S 2) and the crack line is parallel to the load (i.e., when α = 0°), the specimen is subjected to pure opening mode I. With different combinations of S 2 /R and α, mixed-mode I/II can be obtained.

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  • MIXED MODE TESTING OF ADHESIVE LAYER J.L. Högberg

    specimen, can achieve mode mixity in the complete spectrum, i.e. from pure mode I to pure mode II (Högberg 2004). In this paper, a so called the Mixed-mode Cantilever Beam (MCB) specimen is designed and used for mixed mode testing of adhesive layer. Inverse method for evaluation of the experiment and the requirements for the design of a

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  • The loading rate effect on Mode II fracture toughness of

    CLS test was performed in order to examine Mode II (shear) fracture behavior of the composite materials, although usually this kind of test is used in order to calculate mixed-mode (I and II) fracture toughness. The specimen for CLS test is presented in Fig. 2a and consists of 2 parts: lap and strap. During the

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