A bend test device and bend test method enable a mandrel bend test to be automatically performed. The bend test device includes a controlled motor, a drive shaft coupled to the motor, a nose piece coupled to the drive shaft, and a nose clamp for securing a device under test (DUT) to the nose piece. A control system connected to the bend test device uses a programmed control algorithm to control the bend test device. The motor is connected to the drive shaft and rotates the drive shaft in response to control signaling provided by the control system. The rotating drive shaft in turn rotates the nose piece. Rotation of the nose piece bends the mounted DUT. The motor rotates the drive shaft as defined by the software parameters and the DUT is bent back and forth across a defined radius edge.

Disclosed is a device for testing corrosion fatigue resistance on the basis of acoustic emission. The device includes: a main machine including a supporting frame and a tensile mechanism arranged on the supporting frame; a clamping mechanism including a first clamp and a second clamp that is arranged opposite the first clamp, where the first clamp and the second clamp are both connected to the tensile mechanism, the tensile mechanism is used for driving the first clamp and the second clamp to move close to or away from each other, the first clamp is provided with an accommodation cavity for accommodating a corrosive substance, the accommodation cavity is provided with an opening that is provided on the first clamp and close to one end of the second clamp, and the first clamp can place a test specimen in the accommodation cavity when fixing the test specimen.

In a material testing machine including a load actuator including a shaft configured to make a linear motion, and configured to apply a load to a test piece through the linear motion of the shaft, the load actuator includes a bearing configured to support the shaft, and the bearing serves as an air bearing.

Described are a test device, a multi-specimen test fixture star and a multi-specimen test fixture. The test device includes a bath chamber that is automatically replenished with bath liquid throughout an extended test period. The multi-specimen test fixture star is non-circularly symmetric and can be used, for example, in a rectangular bath chamber to hold a greater number of test specimens than a circularly symmetric test fixture star. The multi-specimen test fixture includes, in part, a multi-specimen test fixture star and a shaft having one or more keyways and enables the test fixture star to be repositioned along the shaft without loss of rotational alignment to the shaft.

A device and a method for testing tensile resistance of multiple-row grouped pillars in an inclined goaf are provided. The bottoms of stands of the device are connected with a testing machine base, and the tops of the stands of the device are connected with a transverse frame; an upper slideable clamping seat and a lower slideable clamping seat are semi-cylindrical blocks, multiple lower loading jaws that are positioned to have a same central line are arranged on the lower slideable clamping seat, each of the lower loading jaws is opposite to a corresponding one of the upper loading jaws, the lower loading jaws are welded to the lower slideable clamping sea to test the tensile resistance of samples together; the upper part of the upper slideable clamping seat is connected with an upper pressure disk, and the lower slideable clamping seat is connected with a lower pressure disk.

An in-situ tensile device for X-ray tests is provided, including: a frame including a connecting structure, where the connecting structure is configured to fixedly connect to a testing bench of a testing device; a stretching mechanism, disposed on the frame; a clamping mechanism, including two clamping assemblies arranged opposite to each other in a length direction; where the two clamping assemblies are configured to clamp two ends of a testing piece, the testing piece is provided with a testing surface, and the testing surface is disposed on surfaces of the two clamping assemblies; the stretching mechanism is drivingly connected to the two clamping assemblies to enable the two clamping assemblies to move synchronously in one of a direction approaching each other and a direction far away from each other; and the two clamping assemblies are detachably connected to the stretching mechanism. The device can improve the accuracy of test results.

A system and a method evaluate the effect of proactive utilization of a spatial stress field in laboratory. The system includes a rock sample placement device for placing a rock sample, a confining pressure control device for applying a set confining pressure to the rock sample, a fracture imaging device, a fracturing fluid injection device for injecting fracturing fluid into the perforation in the wellbore of the rock sample to form fractures within the rock sample, a stress measurement device, and a processing device for calculating a stress field proactive utilization coefficient of the rock sample.

The invention discloses an experimental apparatus and an experimental method for the negative bending moment zone of a continuous beam to bear load under chloride environment, relating to the technical field of engineering experiment, comprising a high-rigidity main frame, a loading system, an erosion system and a test beam; the test beam is detachably arranged on the high-rigidity main frame; the loading system is installed on the high-rigidity main frame and under the test beam, and is used to apply load to the test beam; the erosion system is arranged on the test beam with built-in chloride solution; the test beam is a continuous beam that meets the design requirements. The experimental apparatus provided by the invention is stable and reliable, easy to use, and can provide the experimental conditions for the wet-dry cycle and the load-bearing coupling reaction in chloride environment.

A tensile test fixture for quick testing of materials with low transverse strength and relatively high longitudinal strength. After the tensile test fixture is loaded into a universal testing machine, such as a two-part load frame, a first test specimen is aligned and tensile tested. Alignment of the first test specimen ensures that all consecutive test specimens are aligned within the tensile test fixture without further alignment required.

A modular test fixture is configured to quickly support test samples of different configurations for testing.