A material evaluation device includes one or more memories; and one or more processors coupled to the one or more memories and the one or more processors configured to: store a certain number of hysteresis curves that, with respect to a change in a first physical quantity of N times at least one of a plurality of positions of a material, each represents a change in a second physical quantity of each time, the N being an integer equal to or greater than 2, extract points extracted by scanning each of the N hysteresis curves with a value of the second physical quantity for at least one of the plurality of positions, generate one-dimensional information regarding the second physical quantity by arraying the extracted points, and acquire a physical property value of the material by using the generated one-dimensional information.

The present invention provides a testing and characterization method for an initial fatigue damage and development process of vulcanized rubber, and falls within the technical field of rubber. The testing and characterization method comprises the following steps: preparing vulcanized rubber; preparing test samples; preparing fatigue testing specimens; and characterizing an initial fatigue damage and development process. The testing and characterization method provided by the present invention is simple, and closely associates a simple and easy-to-implement macro mechanical property test with changes of an internal microstructure, which are difficult to observe and analyze; and the method is high in efficiency and easy for operation and data collection, and data measured has good reference.

The present disclosure discloses a reciprocating rock fracture friction-seepage characteristic test device and method. The test device includes an X-axis shear system, a Y-axis stress loading system, a Z-axis stress loading system, a servo oil source system, 5 a pore pressure loading system, and a host. The X-axis shear system includes an X-axis EDC controller, an upper shear box, a lower shear box, an X-axis left hydraulic cylinder, an X-axis right hydraulic cylinder, an X-axis left pressure head, an X-axis right pressure head, an X-axis left pressure sensor, an X-axis right pressure sensor, an X-axis displacement sensor, and an X-axis 10 displacement sensor. The pore pressure loading system includes an air cylinder, a pressure gauge, a pressure reducing valve, a fluid inlet pipeline, a fluid outlet pipeline, and a flowmeter.

A rolling apparatus for evaluating durability of a flexible material includes a base unit, a rolling unit rotatably coupled to the base unit and around which the flexible material is wound, and a sliding unit which grips an end of the flexible material wound around the rolling unit and is spaced apart from the rolling unit to be slidably coupled to the base unit. The sliding unit is set to at least one of a preset speed and torque in the direction in which the flexible material is pulled, and at least one of the speed and torque of the rolling unit for an unrolling operation of the rolling unit and a rolling operation of the rolling unit is controlled such that the flexible material can maintain a flat state.

A sliding apparatus for durability evaluation of a flexible material includes a base unit having a folding space formed therethrough, a sliding unit which is coupled to the base unit to be slidably movable and to which one side of a flexible material to be evaluated is fixed, and a folding unit which is arranged to be apart from the sliding unit, to which the other side of the flexible material is fixed, and which rotates with respect to the sliding unit to in-fold or out-fold the flexible material in an unfolded state. The sliding unit changes the position of the bent portion formed in the flexible material as the sliding unit slidably moves on the base unit with the flexible material in an in-folded state or out-folded state.

According to the metal foil fatigue test system and metal foil fatigue test method of the present invention, the fatigue degree and lifespan of the metal foil may be easily predicted by injecting gas into the tube of a roll structure and discharging the gas to simulate charge/discharge of the electrode assembly.

A sensor for measuring the fatigue life of a structure subjected to repetitive loads is disclosed. The sensor includes a backing material arranged for securement to the structure, and a foil arranged for securement to the backing material. The foil includes a conductive path along which electrical current flows at an initial resistance measured prior to the structure being subjected to repetitive loads. A crack initiation feature in the form of a notch is located on the conductive path. In response to repetitive loads applied to the structure, one or more cracks propagate from the crack initiation feature across the conductive path to cause electrical resistance to increase whereby the progression of fatiguing of the structure may be determined.

A material analysis device for analysing a material sample. The material analysis device is equipped with a—generally temperature-controllable—sample chamber and a sample holder, which, supported by at least one pillar, protrudes into the sample chamber, and a loading shaft, to one end of which force is applied by an exciter, and the other end of which bears a connecting member, with which it transmits force to the sample in a defined manner and loads same thereby.

The present disclosure relates to a system for repetitive loading of a prosthetic socket to test the durability of the prosthetic socket. The system includes a base and a load cell coupled to the base. The system further includes a first coupling mechanism positioned vertically above the load cell, and a second coupling mechanism positioned vertically above the first coupling mechanism. The first coupling mechanism is configured to be removably coupled to a first end of the prosthetic socket, and the second coupling mechanism is configured to be removably coupled to a second end of the prosthetic socket. The system further includes a rod having a first end and a second end opposite the first end. The first end of the rod is coupled to the second coupling mechanism. The system further includes a motor coupled to the second end of the rod, a support structure extending vertically from the base, and an actuator coupled to the support structure such that the actuator is positioned vertically above the second coupling mechanism. The system further includes a curved rail coupled to the actuator and positioned between the actuator and the second coupling mechanism. The curved rail is configured to contact the second coupling mechanism along an arc defined by the curved rail such that the second coupling mechanism moves along the arc when the motor moves the rod.

The invention discloses a method and a system for predicting the corrosion fatigue life of prestressed concrete bridges. A corrosion level of the strand is predicted to obtain the residual tension force of a structure. A stress concentration factor is integrated to consider the stress concentration effect caused by pitting corrosion, and a growth model of the elastic stress of the strand under the coupled effect of corrosion and fatigue is proposed. A growth model of the plastic stress of the strand is established using a cross-section loss of the strand as a fatigue damage parameter based on a degenerated elastic modulus of the concrete after fatigue. Failure criteria for the concrete, the strand, and a longitudinal tension bar are defined, so that a set of methods for analyzing the life of a prestressed concrete bridge subjected to corrosive environment and fatigue load are formed.