A method for identifying prestress force in single-span or multi-span PCI girder-bridges is provided. The method includes non-destructive steps for obtaining a set of parameters of the PCI girder-bridge under investigation, and combines various analyses to identify the change of prestress force. Therefore, the losses of prestress force are tracked and predicted. The method does not cause structural damages along the PCI girder-bridge, and the cost of the identification is significantly decreased.

Disclosed is a test rig and a method for mechanical load testing of a specimen extending along a longitudinal axis from a first specimen end to a second specimen end and comprising a composite material extending along the longitudinal axis from a first composite end to a second composite end and a primary elongate component extending along the longitudinal axis from a first primary component end to a second primary component end, the first primary component end being the first specimen end, and wherein the composite material encapsulates the primary elongate component along a first interface region extending along the longitudinal axis from the second primary component end to the first composite end. The method comprises applying a load to the specimen resulting in an axial load component and a bending moment being imposed to the specimen.

A bending apparatus for a sample is disclosed. The bending apparatus includes a translation mechanism that translates a vertical displacement/force into a horizontal displacement/force for bending. Components of the bending apparatus are fabricated from a strong, radiolucent material. In these ways, the bending apparatus is compatible with micro-CT imaging, and as such, may be used to bend a sample during imaging. In a particular application, the bending apparatus may be used to measure biomechanical properties of a bone, such as bone strength, bone material properties, fracture toughness, and fracture propagation.

A reinforced mixed-mode bending apparatus (RMMBA) is provided. The RMMBA is a new fixture design for testing fracture and characterizing delamination in layered materials under combined mode I (pulling/tension) and mode II (in-plane shear) loads. The purpose of this design is to provide a much less compliant fixture for conducting the Mixed Mode Bending (MMB) test. Embodiments described herein improve the accuracy of the MMB test and reduce the complexity of post-processing the collected data.

A strain state of a bending outside surface of a test specimen is photographed by use of a camera without falling out of focus during a bending test. A bending test facility for a metal sheet material for an automobile body includes a supporting member that supports two supported portions of a flat test specimen formed of the metal sheet material for an automobile body, a punch for performing a bending test in which an area between the two supported portions of the test specimen is pressed from an opposite side to the supporting member so that the test specimen is bent to be deformed, and a camera for photographing, from the side of the supporting member, a bending outside surface of the test specimen during the bending test using the punch, with relative positions of the punch and the camera during the bending test being fixed.

Systems and methods for testing cable bending fatigue include a hollow body for at least one cable to pass through, a pair of primary gears, respectively located at both ends of the body, and connected by a transmission shaft and can be driven to rotate by a first motor via the transmission shaft, and at least one pair of secondary gears, each pair of secondary gears being respectively meshed with the pair of primary gears, and drivable to rotate by the meshed primary gears, wherein, both ends of the cable are respectively fixed to gear centers of a respective pair of secondary gears, and the body causes the cable in a bended state when both ends of the cable are fixed to the gear centers of the pair of secondary gears.

A nano material testing apparatus includes a main frame; a testing unit including an actuator and a load cell connected to the actuator; a jig unit configured to be connected to the testing unit and including an upper jig that clamps one side of an upper portion of the nano material specimen and a lower jig that is located below the upper jig and clamps one side of a lower portion of the nano material specimen; a stage unit configured to be connected to the lower jig; a first alignment unit configured to be located to be spaced apart from a front surface of the nano material specimen; a second alignment unit configured to be located to be spaced apart from side surfaces of the nano material specimen; and a controller.

An electromagnetic multiaxial fatigue testing machine includes a test piece fixing platform and an electromagnet loading mechanism arranged on a frame, wherein the electromagnet loading mechanism includes a first loading device for bend loading, and a second loading device for axial and torsional loading. The first loading device includes a first permanent magnet and a first electromagnet with a direction of a magnetic force generated therebetween is orthogonal to an axial direction of a test piece; the second loading device includes a second permanent magnet and a second electromagnet mounted on a swinging pair with a direction of a magnetic force generated therebetween is parallel to the axial direction of the test piece.

Paper physical property detecting device includes a first detector that measures a sheet of paper (hereinafter, merely referred to as a paper) made to stop temporarily on a conveyance path and acquires a first value corresponding to a first physical property, a second detector that measures a paper while conveying the paper on the conveyance path and acquires a second value corresponding to a second physical property with regard to a physical property different from the first physical property; and a corrector that corrects the first value on a basis of the second value and creates post correction data.

Apparatus and methods related to low cycle fatigue testing are described. For example, some embodiments may contain a control box, two fitting connections, a pressure gauge, a plurality of clamps, a plurality of hydraulic cylinders, a plurality of control cables, and a strain gauge, for testing the low cycle fatigue properties of a testing specimen, for example, a steel tube umbilical.