Analysis of residual stress in materials is often done in static conditions in a laboratory. Accurate systems and methods for performing these analyses in a dynamic, non-laboratory environment are notoriously difficult and can be very inaccurate. A method using a portable, field deployable apparatus having greater accuracy than currently available is disclosed whereby accurate and repeatable residual stress analysis may be implemented in non-laboratory environments leading to greatly improved diagnostics, maintenance and life limit prediction.

The present disclosure describes systems and methods to compensate for error in a video extensometer system, including noise, perspective variations, and/or component placement and/or operation.

A method for determining hardness of a material by implementing 3D imaging is proposed. The imaging provides database of points on the 3D imprint in an orthogonal X-Y-Z coordinate system. An imaginary image of the imprint is formed by finding a plurality of intersection points obtained by intersecting the imprint image in X-Y plane with the X-Z plane movable in the Y-axis direction for obtaining a plurality of points of intersection that lay in the X-Y plane. Statistical processing of the plurality of the points of intersection makes it possible to form imaginary image of the imprint in the X-Y plane and to use the reference dimension of the obtained imaginary image as a parameter for insertion into the hardness calculation formula.

A system for simultaneously measuring the indentation hardness properties, span properties, and resilience properties of a mattress includes a first indentation means and a second indentation means, and means for urging the first indentation means and the second indentation means into the mattress with a predetermined force, and also includes laser means for projecting a laser line configured to map, preferably by photographic triangulation, the amplitude, shape, and time-dependency of the resultant deflection of the mattress surface between the first indentation means and the second indentation means. A method for simultaneously measuring the indentation hardness properties, span properties, and resilience properties of a mattress is also provided.

Disclosed is a testing device for measuring interfacial shear properties between fibers and media, including a main body, which is a rectangular plate-like structure with L-shaped plates provided at the bottom ends of the main body, a connecting rod provided at a top right of the main body, a groove provided at the top of the main body; and four rotating grooves are provided inside the groove. The rotating grooves are cylindrical structures with raised centers at both ends; and a mounting piece is installed above the left end of the main body; a magnet of a displacement micrometer is connected to a tension trolley, a high-definition camera is turned on, weights are added into a loading bucket and the fiber movement is observed until the fiber is pulled out or sliding friction occurs, and then the camera is stopped and accurate data is tested.

A monitoring device includes an acquisition unit configured to acquire a captured image of a display panel of a control device configured to control an analyzer, an image storage unit configured to store the captured image, and a state determination unit configured to determine a state of the analyzer based on the captured image.

Analysis of residual stress in materials is often done in static conditions in a laboratory. Accurate systems and methods for performing these analyses in a dynamic, non-laboratory environment are notoriously difficult and can be very inaccurate. A method using a portable, field deployable apparatus having greater accuracy than currently available is disclosed whereby accurate and repeatable residual stress analysis may be implemented in non-laboratory environments leading to greatly improved diagnostics, maintenance and life limit prediction. Especially the analysis of a pipe or channel can be facilitated with this invention.

A system for mechanical testing a specimen includes a 3D printed mechanical testing fixture; a linear actuator having an axis of movement; a controller configured to control the linear actuator; two cameras; a data-acquisition system configured to acquire data from the linear actuator, the controller, and the two cameras; and the specimen. The specimen is marked in two locations with tracking markers to provide indication to the data acquisition system via at least one camera of movement and change in length of the specimen. The fixture includes force-sensing beams extending perpendicular to the axis of force.

A gel-time detection apparatus includes a carrier, a stirring device, and an image-capturing device. The gel-time detection apparatus uses the carrier to liquefied powder to be detected, uses the stirring device to stir the liquefied powder and sense the torque of stirring the liquefied powder, and uses the image-capturing device to capture images of the liquefied powder, so as to determine a gel time according to a determination criterion relevant to the torque and the images. A gel-time detection method includes liquefying powder to be detected, stirring the powder, sensing the torque of stirring the liquefied powder, capturing images of the liquefied powder, and then determining a gel time according to a determination criterion relevant to the torque and the images. The determination criterion may include a torque predetermined threshold and an area-shrinkage-rate predetermined threshold.

A method, apparatus and system for calculating stress parameters is provided. The method comprises establishing a first image pyramid according to an image of a sample before deformation, and establishing a second image pyramid corresponding to the first image pyramid according to an image of the sample after deformation; starting from a top level in the first image pyramid, iteratively calculating displacement information on each level in the first image pyramid relative to a corresponding level in the second image pyramid based on a center point of each sub-region at each level in the first image pyramid and other positions in the sub-region; calculating strain information on the sample according to displacement information on a bottom level of the first image pyramid; and calculating stress parameters of the sample based on the strain information.