A method for predicting a multiaxial fatigue life. The method includes: obtaining a first temperature rise value of a to-be-tested material in a first cycle; determining first inherent dissipation energy of the to-be-tested material in the first cycle according to the first temperature rise value and a time constant; and determining the multiaxial fatigue life of the to-be-tested material according to a first proportional value, the first inherent dissipated energy, axial fatigue test parameters and torsional fatigue test parameters; the first proportional value is a ratio of an axial strain amplitude to a torsional strain amplitude of a multiaxial fatigue test, the axial fatigue test parameters are configured to represent an axial fatigue resistance of the to-be-tested material, and the torsional fatigue test parameters are configured to represent a torsional fatigue resistance of the to-be-tested material.

An inspection device and method produces a deformation in a panel body and reveals a defect in the panel body. A base and a collar define a chamber. A vacuum device connects with the chamber for evacuating the chamber after the panel body is positioned adjacent to the collar and deflects the panel body into the chamber for propagating the defect in the panel body.

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 Bauschinger effect test fixture that cooperates with a test machine for stretching and compressing materials to perform a Bauschinger effect test on a test piece having a symmetrical configuration with two wide ends and a narrow middle part. The fixture includes two identical split bodies, where each split body has a base provided, longitudinally from a central part to one end of the base, with a limiting groove corresponding to a half of the profile of the test piece. Two sides of the groove are arranged symmetrically with a plurality of threaded through holes and a cover is provided along its central axis with two threaded through holes with which the test piece is pressed tightly by bolts. An end of the cover corresponding to a notch of the limiting groove is provided with a through groove configured for placing a stress ultrasonic detection probe on the test piece.

A variable angle loading testing machine is provided, which may include a bottom plate and a base fixedly connected to the bottom plate. A rock-sample accommodating cavity is formed in the base, and a rectangle-shaped sample is suitable for being placed into the rock-sample accommodating cavity. A side of the base is fixedly connected to two arc-shaped tension beams arranged in parallel, and a variable angle loading mechanism is slidably connected between the two arc-shaped tension beams. Through-holes are formed on the base, and an output end of the variable angle loading mechanism abuts against the rectangle-shaped sample through one of the through-holes. Loading and unloading of a stress with variable direction and magnitude under excavation disturbance can be simulated, which is of great significance for understanding mechanical behaviors of rock-soil mass under excavation disturbance.

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 Bauschinger effect test fixture that cooperates with a test machine for stretching and compressing materials to perform a Bauschinger effect test on a test piece having a symmetrical configuration with two wide ends and a narrow middle part. The fixture includes two identical split bodies, where each split body has a base provided, longitudinally from a central part to one end of the base, with a limiting groove corresponding to a half of the profile of the test piece. Two sides of the groove are arranged symmetrically with a plurality of threaded through holes and a cover is provided along its central axis with two threaded through holes with which the test piece is pressed tightly by bolts. An end of the cover corresponding to a notch of the limiting groove is provided with a through groove configured for placing a stress ultrasonic detection probe on the test piece.

A solid pharmaceutical dosage form testing apparatus and a method are presented. The solid pharmaceutical dosage form testing apparatus includes a striker component, an impact platform, a sensor data acquisition system, and a solid dosage form placement mechanism. The solid dosage form placement mechanism has first and second push components that are movable toward each other to position a solid dosage form at an impact site. The method includes performing an impact strike test on a first plurality of solid dosage forms, and measuring a plurality of peak impact force values. The method may include performing a drop test on a second plurality of solid dosage forms, and measuring a plurality of physical defect rates. The method may include determining a model that describes a relationship between peak impact force values and physical defect rates, and determining, based on the model, a predicted physical defect rate.

A machine that can stretch a material sample biaxially is disclosed. The material sample is gripped on four sides using two pairs of opposing gripping assemblies. Each gripping assembly comprises of multiple individual grippers which can slide towards or apart from each other. The two pairs of opposing gripping assemblies can be slid towards or away from each other, producing either equal or unequal stretches in the two directions. Each individual gripper slides in a direction perpendicular to the direction in which its respective gripping assembly can move as a unit. As the gripping assemblies are moved, the individual grippers are also moved in such a way as to maintain the rectangularity of a rectangular region of the specimen as much as possible.

Methods and apparatuses for multiple degree-of-freedom fatigue testing of a specimen. The apparatus includes a first platform, a second platform, a plurality of actuator assemblies, a load cell, a mounting plate, a specimen support, a direct-strain imaging system, and a local sense and control system. Each actuator assembly includes a servo-control, a position encoder, and a piston that is constructed to move in a linear direction in accordance with the servo-control. Each piston is rotatably connected to the second platform. The load cell is connected to the second platform and constructed to output force measurements in three orthogonal directions and torque measurements about the three orthogonal directions. The mounting plate is constructed to hold a portion a specimen. The specimen support is constructed to hold another portion of the specimen. The direct-strain-imaging system includes a camera that is constructed to record a plurality of images of the specimen during fatigue testing. The local sense and control system constructed to receive: a loading specification, the force measurements and torque measurements from the load cell, and position information from each position encoder, and output control commands to each servo-control of the plurality of actuator assemblies based on the received loading specification. The control commands are updated in time in accordance with the position information from each position encoder and the force measurements and torque measurements from the load cell.