A crushing system for large-size natural gas hydrate rock samples, which mainly includes a crushing and stirring control subsystem, crushing and stirring execution subsystem and hydrate preparation subsystem. Full automatic control to parameter acquisition and experimental process is achieved by utilizing modern automation technology, including the function of automatically crushing the large-size natural gas hydrate rock samples and also monitoring, collecting and storing the drilling pressure, the torque and the internal furnace pressure and temperature parameters during the crushing process in real time, to provide reliable guarantee for the follow-up researches on crushing mechanism, crushing efficiency, drilling parameter optimization, rock crushing ability evaluation of a crushing tool and the like of the large-size natural gas hydrate rock samples and necessary experimental verification means for optimization of on-site exploiting construction conditions of natural gas hydrate.

A crushing system for large-size natural gas hydrate rock samples, which mainly includes a crushing and stirring control subsystem, crushing and stirring execution subsystem and hydrate preparation subsystem. Full automatic control to parameter acquisition and experimental process is achieved by utilizing modern automation technology, including the function of automatically crushing the large-size natural gas hydrate rock samples and also monitoring, collecting and storing the drilling pressure, the torque and the internal furnace pressure and temperature parameters during the crushing process in real time, to provide reliable guarantee for the follow-up researches on crushing mechanism, crushing efficiency, drilling parameter optimization, rock crushing ability evaluation of a crushing tool and the like of the large-size natural gas hydrate rock samples and necessary experimental verification means for optimization of on-site exploiting construction conditions of natural gas hydrate.

A system for measuring loading on a test specimen. The system includes the test specimen arranged between a first loading bar and a second loading bar. The system further includes a first loading unit and a second loading unit configured to apply a first load and a second load to the first and second loading bars, respectively. The system further includes a first clamp and a second clamp configured to hold the first and second loading bars against the first and second loads, respectively. The system further includes a clamp actuating unit configured to selectively release at least the first clamp. The clamp actuating unit further includes a controller configured to electrically actuate at least one first electromechanical transducer from a retained state to a released state to release the first clamp, such that the first loading bar applies a first loading wave to the test specimen.

Systems and methods for testing cable bending fatigue include a hollow body for at least one cable to pass through, a pair of primary gears, respectively located at both ends of the body, and connected by a transmission shaft and can be driven to rotate by a first motor via the transmission shaft, and at least one pair of secondary gears, each pair of secondary gears being respectively meshed with the pair of primary gears, and drivable to rotate by the meshed primary gears, wherein, both ends of the cable are respectively fixed to gear centers of a respective pair of secondary gears, and the body causes the cable in a bended state when both ends of the cable are fixed to the gear centers of the pair of secondary gears.

A test bench for screwdrivers comprises a hydraulic brake unit (11) provided with a coupling (12) for a screwdriver to be tested and angle and torque measurement transducers (15). The brake unit (11) is supplied by a proportional electrovalve (16) under the control of a PID controller (19) which receives an electrovalve control signal (22) from a control unit (26) so as to follow braking curves depending on the angle of rotation and/or torque measured. The bench comprises a memory (21) for storing different sets of parameters for the PID controller (19), which can be selected by the control unit (26) so as to have different control characteristics. A method for controlling the bench is also described.

A test bench for screwdrivers comprises a hydraulic brake unit (11) provided with a coupling (12) for a screwdriver to be tested and angle and torque measurement transducers (15). The brake unit (11) is supplied by a proportional electrovalve (16) under the control of a PID controller (19) which receives an electrovalve control signal (22) from a control unit (26) so as to follow braking curves depending on the angle of rotation and/or torque measured. The bench comprises a memory (21) for storing different sets of parameters for the PID controller (19), which can be selected by the control unit (26) so as to have different control characteristics. A method for controlling the bench is also described.

Safety systems and material testing systems including safety systems are disclosed. An example material testing system includes: at least one actuator configured to control one or more operator-accessible components of the material testing system; an actuator disabling circuit configured to disable the at least one actuator; and one or more processors configured to: control the at least one actuator based on a material testing process; monitor a plurality of inputs associated with operation of the material testing system; determine, based on the plurality of inputs and the material testing process, a state of the material testing system from a plurality of predetermined states, the predetermined states comprising one or more unrestricted states and one or more restricted states; and control the actuator disabling circuit based on the determined state.

A method of obtaining a sample of materials includes building a product through an additive manufacturing process. A capsule is formed with an internal chamber inside of the capsule. The capsule is formed during the building of the additive manufacturing product. A sample of powder is encapsulated inside the internal chamber as the capsule is built. The internal chamber is hermetically sealed from an exterior environment to retain the sample of powder in the internal chamber.

A method of obtaining a sample of materials includes building a product through an additive manufacturing process. A capsule is formed with an internal chamber inside of the capsule. The capsule is formed during the building of the additive manufacturing product. A sample of powder is encapsulated inside the internal chamber as the capsule is built. The internal chamber is hermetically sealed from an exterior environment to retain the sample of powder in the internal chamber.

A torsional fatigue testing apparatus comprises: a cable holding device, a motion guiding device and a driving device. The cable holding device is provided for holding a cable to be tested to extend between a rotatable holder and a slidable holder. The motion guiding device is provided for converting the rotational motion of the driving device into a reciprocating linear sliding motion by means of linkage so as to alternately rotate the rotatable holder forwardly and reversely, and therefore to repeatedly twist, by the rotatable holder, the cable to be tested.