A method for testing an interfacial tribochemical reaction between a diamond wafer and active metal abrasive or metal oxide abrasive is provided. A surface of a diamond indenter used in a nano scratch tester is coated with a layer of the active metal abrasive or the metal oxide abrasive with uniform and controllable thickness by magnetron sputtering, and an interface interaction between the layer of the active metal abrasive or the metal oxide abrasive and the diamond wafer is controlled by a scratch test of the diamond wafer. Chemical components of an interaction section on a surface of the diamond wafer are analyzed by the scanning probe micro Raman spectrometer.

The disclosure discloses an automatic simulation test bench and a test method for similar materials of top-coal caving mining. Wherein, the test bench includes a test bench base, a coal seam and strata simulation module, a coal releasing simulation module, a material recovery module, automatic mixing system and a central control system. The disclosure adopts modular construction to meet the requirements of similar material simulation test of top-coal caving mining under different geological conditions and mining technology to the greatest extent. The disclosure adopts automatic control, reduces the working intensity and operation difficulty of the test personnel, and reduces the influence of human factors on the test results. The disclosure adopts a lifting structural design, so as to meet the requirements of similar simulation test of top-coal caving mining under different mining and caving ratios.

In an aspect, there is a method of determining allowable defects for a composite component comprising identifying at least one wrinkle characteristic of a composite component wrinkle defect; making a first plurality of specimens each having a predetermined wrinkle defect representative of the composite component wrinkle defect; measuring each of the predetermined wrinkle defects in the first plurality of specimens for at least one performance metric to generate performance data; and generating an allowable wrinkle defect profile based on the performance data from the first plurality of specimens. In other aspects, there are methods of making a specimen with a predetermined wrinkle defect.

A TBM-mounted surrounding rock wear resistance testing system and method, the system including: a fixing module, arranged on a TBM, the module has a movable end for extending to the surrounding rock of a tunnel; a surrounding rock polishing module on the movable end, the module includes a polishing mechanism for test area; a surrounding rock wear resistance testing module on the movable end, follows the movable end moving the test area, and including a mechanism for testing the wear resistance of the polished test area and a drive mechanism thereof; and a central control module, configured to control the motion states and operations of the fixing module, the surrounding rock polishing module and surrounding rock wear resistance testing module, and determine the wear resistance of the surrounding rock according to the wear resistance test result. The system can polish tunnel surrounding rock during TBM excavation and test wear resistance.

The disclosure discloses an automatic simulation test bench and a test method for similar materials of top-coal caving mining. Wherein, the test bench includes a test bench base, a coal seam and strata simulation module, a coal releasing simulation module, a material recovery module, automatic mixing system and a central control system. The disclosure adopts modular construction to meet the requirements of similar material simulation test of top-coal caving mining under different geological conditions and mining technology to the greatest extent. The disclosure adopts automatic control, reduces the working intensity and operation difficulty of the test personnel, and reduces the influence of human factors on the test results. The disclosure adopts a lifting structural design, so as to meet the requirements of similar simulation test of top-coal caving mining under different mining and caving ratios.

The invention relates to a method for producing a test body (30) for mechanically destructively testing a materially bonded joining connection, wherein the method comprises the following steps: providing an areal fiber composite substrate formed from a fiber composite material which has a fiber material and matrix material in which the fiber material is embedded, applying at least one test fabric and an adhesive to a substrate surface of the areal fiber composite substrate, and curing the adhesive, and therefore a materially bonded joining connection is produced between the test fabric and the substrate surface by way of the cured adhesive,
wherein a Dutch-weave fabric and/or a square-mesh fabric is provided as the test fabric.

A device and method for preparing a solidified cohesionless soil specimen for triaxial test. The device includes a first vessel for storing a grout, a first peristaltic pump, a grouting pipe, a first electrode rod, a direct-current power supply, a first glass stopper, a PMMA pipe, a circumferential grouting cylinder, a first hoop sleevedly provided on the circumferential grouting cylinder, a second hoop sleevedly provided on the PMMA pipe, a return pipe, a second glass stopper, a second electrode rod, a liquid outlet pipe, a first water-stop clamp, a second water-stop clamp, a second vessel for collecting an exudate, and a second peristaltic pump.

A method of managing a tubular having a seam that exhibits signs of hydrogen induced cracking that extends radially along the seam, and which is different from classic step-wise cracking. Included in the method is evaluating the strength and ductility specimens taken from the tubular that have been hydrogen charged; and which provides an indication if the seam is susceptible to hydrogen embrittlement. The strength is evaluated by comparing tensile strength of the hydrogen charged specimen with that specified in an industry standard, such as API 5L. The ductility is evaluated based on comparing percent elongation of the hydrogen charged specimen with percent elongation of a specimen obtained from the tubular and not hydrogen charged. Tubulars with seams found susceptible to hydrogen embrittlement would not be put into sour service, whereas those found not susceptible to hydrogen embrittlement can be put in a sour service.

The present disclosure relates to a method for determining a softening temperature of copper and copper alloy, including: selecting a plurality of samples of the same material, annealing the plurality of samples at different temperatures, air-cooling the plurality of samples; measuring the tensile strength of an original sample and the plurality of samples after the annealing; plotting a data of the measured tensile strength into a temperature-tensile strength curve; a temperature at which the tensile strength in the temperature-tensile strength curve drops to a certain value of an original sample tensile strength is the softening temperature of the material. The above technical solution in the present disclosure uses the tensile strength instead of hardness to measure the softening temperature. It can effectively improve the detection efficiency and reduce the cost, and can be widely used in determination of the softening temperature of fine materials of copper and copper alloy.

A test coupon (1) for an ISO-standard-conforming test method for testing a material hardness of gearwheels. The test coupon (1) is designed as a two-piece test coupon (1) including a casing body (2) and a test body (3). The test coupon (1) being tested by an ISO-standard-conforming test method for determining a material hardness of the gearwheels.