The present disclosure relates to a materials testing device wherein an algorithmic approach is used to implement outer loop control software algorithm for control of a plurality of motors imparting different forces on a materials testing specimen. In particular, a torsion motor is controlled by an outer loop control software to control the rotational force applied to the materials testing sample.

Safety systems requiring intentional function activation and material testing systems including safety systems requiring intentional function activation are disclosed. An example material testing system includes: an actuator configured to control an operator-accessible component of the material testing system; an operator interface comprising a plurality of inputs; and one or more processors configured to: control the actuator based on at least one of a material testing process or an input from the operator interface; and require two or more inputs to be received within a predetermined threshold time to permit at least one operation of the actuator.

An example material testing system includes: an actuator configured to control an operator-accessible component of the material testing system; and one or more processors configured to: control the actuator based on at least one of an operator command or a material testing process; determine, based on a plurality of inputs, 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; when the state of the material testing system is one of the restricted states, enforce a restriction on the actuator; and in response to completion of an action involving controlling the actuator, automatically set the state of the material testing system to one of the restricted states.

The present disclosure relates to a materials testing device wherein an algorithmic approach is used to implement outer loop control software algorithm for control of a plurality of motors imparting different forces on a materials testing specimen. In particular, a torsion motor is controlled by an outer loop control software to control the rotational force applied to the materials testing sample.

Safety systems requiring intentional function activation and material testing systems including safety systems requiring intentional function activation are disclosed. An example material testing system includes: an actuator configured to control an operator-accessible component of the material testing system; an operator interface comprising a plurality of inputs; and one or more processors configured to: control the actuator based on at least one of a material testing process or an input from the operator interface; and require two or more inputs to be received within a predetermined threshold time to permit at least one operation of the actuator.

A mechanical testing system having a frame, and a stage for holding a sample. An arm for pressing a tool against a surface of the sample. A primary actuator is connected to the frame and applies a primary force and drives the tool relative to the sample, thereby causing the frame to flex. A displacement sensor measures a displacement value comprised of two components, the first component including a distance traveled by the probe into the sample as the primary force is applied, and the second component including a measure of a degree of flex of the frame as the primary force is applied. A compensating actuator is connected to the frame and applies a compensating force that reduces the second component of the displacement value.

A closed-loop control method based on a testing machine for accurately controlling the loosening of a bolt transverse load is disclosed. The testing machine for accurately controlling the loosening of the transverse load comprises a load generating motor, a load transfer mechanism, a load control motor and a load control mechanism. The control method of the present invention controls the load generating motor to drive the load transfer mechanism based on control commands, displacement signals collected by the displacement sensor and force signals collected by an S-shaped column type pressure sensor. The testing machine for the looseness of the bolt transverse load is essential in the aspect of exploring a looseness law of a bolt, and can be used to simulate load bearing conditions of the bolt. However, under the condition that some bolts bear constant force load transversely, the testing machine is not used or is inaccurate. The control method of the present invention can accurately control the load transverse load to be stable, especially can ensure constant transverse load and can also simulate the transverse load bearing situation of the bolt more accurately and more comprehensively.

Methods and systems are provided for a torsional material testing system, which includes a rotatable actuator, such as a motor, configured to perform a torsional material testing operation. During a torsional material testing operation, a virtual interlock is configured to engage or disengage with the actuator to prevent or allow rotational movement of the actuator (e.g., during a setup state or during a torsional material testing operation, respectively). A control circuitry is employed to control the virtual interlock as well as the torsional testing system based on one or more operational states before, during, or after a material testing process.

In a case where control input is performed via a low-pass filter, a control gain more appropriate for both stability and responsiveness is set according to setting of the low-pass filter. A control unit (21) performs control input for a load mechanism (40) via a low-pass filter, discriminates a stability of a control system including the load mechanism (40) and the low-pass filter when setting of the low-pass filter is changed, sets an appropriate control gain based on a maximum control gain at which an excess amount of a measured value with respect to a target value is equal to or less than a predetermined value within a range where that the control system is stable, and controls an operation of the load mechanism (40) by using the appropriate control gain.

A tensile testing machine includes: a testing machine body that executes a tensile test; an instruction reception unit that receives an operation instruction for the testing machine body on the basis of an operation from a user; and an instruction storage unit that stores contents and an order of instruction information indicating the operation instruction, which is received by the instruction reception unit, for the testing machine body.