A device for testing impact resistance includes: a shrink film supporting member, disposed on a horizontal platform, and including a main body, a supporting part, and fixing parts disposed on a sidewall of the main body, the supporting part is configured to support a tested shrink film, the plurality of fixing parts is sequentially disposed in parallel at positions of different heights on the sidewall of the main body, and the fixing parts disposed at the positions of different heights represent different impact resistance levels; a level plate, detachably fixed inside the main body by means of any one of the plurality of fixing parts; and an impact member, configured to move downward from a position above a geometric center of the supporting part at a preset speed to exert a frontal impact on the shrink film supported on the supporting part.

The present invention provides a damage detection apparatus, a damage detection method, and a damage detection program that can detect damage in a support by measuring vibration of a supported object. The damage detection apparatus that detects damage in a structure including a supported object and a support according to one example embodiment of the present invention includes a dominant frequency acquisition unit that acquires a dominant frequency from vibration information at a plurality of points on the supported object; a rigid body vibration identification unit that identifies rigid body vibration information on the structure from the acquired dominant frequency; and a damage determination unit that determines damage in the support based on the identified rigid body vibration information.

A device and method for testing a rock specimen in order to determine the fracture toughness (K.sub.IC) thereof. The device comprises: a frame; a hydraulic pressure testing rig supported by the frame and comprising a pressure gauge, a lever and a pressure diaphragm; a storage tank for storing hydraulic fluid and supported by the frame; and a pressure chamber supported by the frame, in which the test specimen is placed to be subjected to hydrostatic pressure through conduits that connect said pressure chamber with the storage tank in fluid communication.

A device and method for evaluating fracture initiation and propagation, and a stress sensitivity of a propped fracture is provided. The device includes a core part, a confining pressure loading part, a fracturing fluid pumping part, a stress sensitivity testing part and a fracture monitoring part. The method evaluates fracture initiation and propagation, and a stress sensitivity of a propped fracture using the above device and is reliable and simple to operate and guides optimization of construction parameters of hydraulic fracturing, thus achieving improvement in productivity of an oil and gas well.

Embodiments of the present disclosure provide a test apparatus for pile-soil interface shear mechanical properties, comprising a support device, a pressure device, a membrane box, and a thrust device; wherein the support device comprises a bottom plate, a top plate, a support beam, and a plurality of bracing struts, the bottom plate and the top plate being both provided with a through-hole for inserting a model pile. The test apparatus for pile-soil interface shear mechanical properties according to the present disclosure has a simple structure and is easy to operate, which may accurately simulate mechanical properties of pile soils having different types of piled foundations in actual works, thereby facilitating researches on pile-soil testing.

The disclosure herein discloses an imaging method of internal defects in longitudinal sections of trees, and belongs to the field of nondestructive testing of trees. The method includes the following steps: with the propagation time of stress waves in a tree as input data, dividing an imaging plane into a predetermined number of grid cells to establish initial velocity distribution in the imaging plane; then performing multiple iterations using a linear propagation model; following each iteration, adjusting the velocity distribution in the imaging plane using the SIRT algorithm; constraining the velocity of each grid cell using maximum and minimum velocity constraints and fuzzy constraints based on grid cell groups, and ending iteration until the final velocity distribution is in good fit with the measured data; by comparing the velocity value of the grid cell at this moment with the reference value of the tested healthy tree, determining an abnormal grid cell; and then performing secondary smoothing processing on the grid cell imaging to obtain the defect location inside the tree. The method can accurately detect the defective area of the tree, and has less false detection areas and good imaging effect.

A system and method for evaluating kerogen-rich shale (KRS) including measuring, via scanning microscopy, electrical conductivity of a KRS sample and a mechanical property of the KRS sample.

A rock damage mechanics test system for high temperature and high pressure deep earth environment includes an MTS triaxial test machine and a control system connected therewith. The MTS triaxial test machine is composed of a rigid frame, a high temperature and high pressure triaxial chamber, and a triaxial chamber base. The control system includes a workstation for data processing and a manual controller for controlling the workstation and a master controller. The system improves mounting and dismounting efficiency of an MTS triaxial force sensor, enhances reliability of lifting and solves the problem of aligning holes during the force sensor mounting process, thus improving the mounting efficiency.

A system and method for evaluating kerogen-rich shale (KRS) including measuring, via scanning microscopy, electrical conductivity of a KRS sample and a mechanical property of the KRS sample.

Among other things, a heating jacket configured for heating a mechanical testing instrument having a probe is disclosed herein. The heating jacket includes a heating element including a jacket wall, and the jacket wall extends around a probe recess, the jacket wall is configured to receive a probe of a mechanical testing instrument within the probe recess, and the heating element is mechanically isolated from the probe with a probe gap. Additionally, a system to correct for thermomechanical drift in a mechanical testing assembly is disclosed herein. The system isolates the mechanical testing instrument from thermomechanical drift of a system frame using a determined difference between, for instance, a probe displacement and a sample displacement.