A method for testing thermal fatigue resistance of a shear cutter includes: engaging the shear cutter with a rotating target cylinder; moving the shear cutter along the rotating target cylinder until the shear cutter is heated to a threshold temperature; cooling the shear cutter in response to heating of the shear cutter to the threshold temperature; and repeating the heating and cooling of the shear cutter.

A system and method for determining adiabatic stress derivative of temperature for rocks under water. The system includes three pressure vessels disposed in seawater. A data collecting unit is in the first pressure vessel. A rock sample is in a first chamber of the second pressure vessel. A temperature sensor is in each of the center of the rock, the surface of the rock sample, and the first chamber. A pressure sensor is also in the first chamber. Outputs of the temperature sensors and the pressure sensor are communicated with inputs of the data collecting unit. A first drain valve is provided on the second pressure vessel and communicated with the first chamber. A second drain valve is provided between the second pressure vessel and the third pressure vessel, and communicated with the first chamber and the second chamber.

A method for predicting an elastic modulus of a material includes providing a sample in a dynamic mechanical analysis device, performing a temperature sweep test to obtain a first data set, performing a frequency sweep test to obtain a second data set, using the second data set to generate a master curve in a frequency domain of the at least one of the storage modulus of the sample or the loss modulus of the sample using time-temperature superposition, converting the master curve in the frequency domain into a time domain relaxation function, and using the time domain relaxation function to predict the elastic modulus of the material.

Disclosed is an exemplary test apparatus having an autoclave head, a fretting mechanism connected on a first end to a first side of the autoclave head, a load train operably connected with a first end of the fretting mechanism, an autoclave adapter connected on a first side to a second side of the autoclave head, and a force balance assembly connected to a second side of the autoclave head and configured to equalize a pressure acting on the load train. Certain exemplary embodiments include an upper plate, a plurality of upper tie rods connected to a first side of the upper plate and a second side of the autoclave adapter, a lower plate, a plurality of lower tie rods connected to the first side of the autoclave head and a first side of the lower plate, and a pressure vessel sealingly connected to the first side of the autoclave head.

A thermal shock testing apparatus includes a test chamber in which a test sample is placed, and which is sealed; a chiller which cools the test chamber to a predetermined temperature with coolant; a lamp heater which heats the test sample to a target temperature; a temperature sensor which detects a temperature of the test sample; a control device which controls the operation of the chiller, and the energization and shut-off of the lamp heater. The test sample is heated to a target temperature with the lamp heater, after the test chamber is cooled to a predetermined temperature. Thereafter, the energization of the lamp heater is shut off, and a thermal shock is added to the test sample. Thereby, a thermal shock test can be conducted in a short time.

The present invention provides a micro-nano impact indentation testing device and method based on cyclic refrigeration, and relates to the technical field of material property testing. The testing device comprises a pressure rod and a stage for low-temperature micro-nano impact indentation testing, and a refrigeration device for refrigerating and cooling the pressure rod and the stage, wherein the refrigeration device refrigerates the pressure rod and the stage by adopting an embedded channel, a cold conduction wire connected to the pressure rod and the stage and a refrigeration balancer in contact with the cold conduction wire are arranged between the pressure rod and the stage, and the temperature of the pressure rod and the temperature of the stage are stabilized at a common temperature point by the cold conduction wire and the refrigeration balancer together.