SYSTEM AND METHOD FOR APPLYING A SHEAR TEST TO A THREADED SECTION OF A BOLT

    公开(公告)号:US20240272054A1

    公开(公告)日:2024-08-15

    申请号:US18167453

    申请日:2023-02-10

    IPC分类号: G01N3/24 G01N3/04

    CPC分类号: G01N3/24 G01N3/04

    摘要: A system having: a shear die set having a fork that includes first and second legs that are have grooves and are spaced from each other to define a test cavity; and a center sleeve that extends between the legs and is radially larger than the first leg groove, the center sleeve has an inner threaded surface and receives a threaded portion of the bolt; a first support sleeve having an inner threaded surface that receives a threaded portion of the bolt, and the first support sleeve has an outer diameter surface that fits in the first leg groove; and a second support sleeve having a same size and shape as the first support sleeve and receives a threaded portion of the bolt and fits in the second leg groove; and the outer diameter of the first support sleeve is different than the outer diameter of the center sleeve.

    Method and apparatus for evaluating damage-healing characteristics of paving asphalt based on energetics principle

    公开(公告)号:US11860150B2

    公开(公告)日:2024-01-02

    申请号:US18326049

    申请日:2023-05-31

    IPC分类号: G01N33/42 G01N3/24 G01N3/32

    摘要: A method for evaluating damage-healing characteristics of paving asphalt based on energetics principle includes: obtaining a numerical integral AH of a stored pseudo strain energy required by asphalt to compensate damage-healing to loading times and obtaining local life compensation ΔN of the asphalt benefiting from damage-healing characteristics; calculating an average stored pseudo strain energy QH of the asphalt according to the following formula:






    Q
    H

    =


    A
    H


    Δ

    N



    ;




    and evaluating the asphalt damage-healing characteristics according to the average stored pseudo strain energy QH of the asphalt. This method is based on the evolution law of the average stored pseudo strain energy required to compensate the damage-healing to explore the damage-healing characteristics of asphalt. As a characteristic index of materials, this energy evaluation index has nothing to do with the damage state and the rest periods, but only depends on the strain load, which improves the testing efficiency.

    METHOD AND APPARATUS FOR EVALUATING DAMAGE-HEALING CHARACTERISTICS OF PAVING ASPHALT BASED ON ENERGETICS PRINCIPLE

    公开(公告)号:US20230384285A1

    公开(公告)日:2023-11-30

    申请号:US18326049

    申请日:2023-05-31

    IPC分类号: G01N33/42 G01N3/24 G01N3/32

    摘要: A method for evaluating damage-healing characteristics of paving asphalt based on energetics principle includes: obtaining a numerical integral AH of a stored pseudo strain energy required by asphalt to compensate damage-healing to loading times and obtaining local life compensation ΔN of the asphalt benefiting from damage-healing characteristics; calculating an average stored pseudo strain energy QH of the asphalt according to the following






    Q
    H

    =


    A
    H


    Δ

    N



    ;




    and evaluating the asphalt damage-healing characteristics according to the average stored pseudo strain energy QH of the asphalt. This method is based on the evolution law of the average stored pseudo strain energy required to compensate the damage-healing to explore the damage-healing characteristics of asphalt. As a characteristic index of materials, this energy evaluation index has nothing to do with the damage state and the rest periods, but only depends on the strain load, which improves the testing efficiency.

    Dynamic load shearing test device and method based on hopkinson bar system

    公开(公告)号:US11821874B1

    公开(公告)日:2023-11-21

    申请号:US18308753

    申请日:2023-04-28

    IPC分类号: G01N3/04 G01N3/24

    摘要: A dynamic load shearing test device and method based on a hopkinson bar system are provided in this disclosure, which relates to the technical field of rock detection tests. The device according to the disclosure includes a bearing frame, a carriage, a sample holding unit, a pressure environment generating unit, a sample switching unit, an incident bar and a transmission bar, and the test method includes following steps: test device assembly, device leveling, pre-test preparation, test conducting, sample angle switching and test device resetting. The disclosure has advantages that the cylindrical sample can be quickly fixed, a required temperature environment can be well maintained, the cylindrical sample can be better fixed in a high-pressure environment, rotation of the cylindrical sample is not hindered in a low-pressure environment, switching of test positions is facilitated, and test efficiency can be accelerated.