A geosynthetic sensor that incorporates an arrangement of a first layer of lengths of electrically conductive geosynthetic and a second layer of lengths of electrically conductive geosynthetic where each said length undergoes a change in electrical resistance or capacitance when subject to changes in any one or more of: pressure; strain; water content; or temperature.

The present invention is equipped with an AE sensor 12, a load test device 14, a storage device 22, a frequency center of gravity calculation unit 24 and a determination device 26. A loading pattern including, raising, retaining and unloading is repeatedly applied to a test subject 1 by the load test device 14, the maximum load is sequentially increased, and the AE waves 2 detected by the AE sensor 12 are stored with the load by the storage device 22. Next, the frequency center of gravity of the AE waves is obtained from the relationship between the frequency of the AE waves 2 and the intensity thereof by the frequency center of gravity calculation unit 24, and delamination preceding breakage is determined by the determination device 26 when the frequency center of gravity 5 is less than a prescribed first frequency.

The present disclosure provides an apparatus and method of use thereof for compressive creep testing of materials in the presence of fluids. The apparatus includes a cantilever arm connected on a first end to a cantilever pivot and including a weight holder on a second end; a first platen connected to the cantilever arm via a swivel located between the first end and the second end; a reservoir; and a second platen disposed within the reservoir and positioned to secure a sample between the first platen and the second platen when a force is applied via the weight holder and the first platen to a sample. Electrical properties of the material can be monitored and measured during the compression creep testing.

A sensor for measuring the fatigue life of a structure subjected to repetitive loads is disclosed. The sensor includes a backing material arranged for securement to the structure, and a foil arranged for securement to the backing material. The foil includes a conductive path along which electrical current flows at an initial resistance measured prior to the structure being subjected to repetitive loads. A crack initiation feature in the form of a notch is located on the conductive path. In response to repetitive loads applied to the structure, one or more cracks propagate from the crack initiation feature across the conductive path to cause electrical resistance to increase whereby the progression of fatiguing of the structure may be determined.

A hose to be evaluated is installed on a fixing frame in a preset shape, and a strain gauge and markers are attached to a surface of the hose. During a course of application of predetermined internal pressure to the hose, strain data is acquired using the strain gauge and an image of an external shape of the hose is captured using a camera device to acquire image data. Based on the strain data and the image data acquired, a change in the shape of the hose between a plurality of time points at identical internal pressure is determined. Such hose fatigue resistance evaluation method can determine changes in the degree of deformation of a hose over time due to repeated application of internal pressure.

A hose to be evaluated is installed on a fixing frame in a preset shape, and a strain gauge and markers are attached to a surface of the hose. During a course of application of predetermined internal pressure to the hose, strain data is acquired using the strain gauge and an image of an external shape of the hose is captured using a camera device to acquire image data. Based on the strain data and the image data acquired, a change in the shape of the hose between a plurality of time points at identical internal pressure is determined. Such hose fatigue resistance evaluation system can determine changes in the degree of deformation of a hose over time due to repeated application of internal pressure.

A measuring device for detection pf measurement signals during a penetrating movement of a penetrating member into a surface of a test object or during a sensing movement of the penetrating member on the surface of the test object. The measuring device includes a housing which accommodates a force generating device and on which a holding element is arranged remote from the force generating device, which holding element is movable relative to the housing at least in one direction along a longitudinal axis of the housing and which accommodates the penetrating member. The measuring device also includes at least one first measuring element for measuring the penetration depth of the penetrating member into the surface of the test object or a traversing movement of the penetrating member along the longitudinal axis relative to the housing during a sensing movement on the surface of the test object, wherein a transmission element is provided which extends between the force generating device and the penetrating member.

A method for quantitatively measuring a physical characteristic of a material includes applying a force to a material sample according to an interrogation profile comprising a set of one or more interrogation parameters. The method further includes measuring a displacement over time of the material sample that occurs as a result of applying the force according to the interrogation profile. The method further includes using the interrogation profile and the measured displacement over time of the material sample to derive a quantitative value of a physical characteristic of the material sample.

The present invention relates to an integrated system and method for in-situ 3-axis scanning and detecting defects in a CFRP composite (150) being loaded under static and cyclic test conditions. The system comprises a test system integrated with (10) a scanning system (20) that comprises a probe assembly (52) to generate eddy current on the surface of the CFRP composite (150) mounted on the test system, and a 3D scanner assembly (60) for movement of the probe assembly (50) over the entire surface area of the CFRP composite (150) along X-axis, Y-axis and Z-axis. An operator console (70) is connected to the test system and the scanning system (20) for controlling (3) mechanical test process in the test system and for controlling 3-dimensional movement of the probe assembly (52) along X-axis, Y-axis and Z-axis in a synchronous manner. Such system and method achieve (3D) automated and synchronized 3D scanning of the CFRP composite (150) to accurately detect the defects in the CFRP composite (150) before/during/after mechanical testing without interrupting the mechanical test process.

The present disclosure provides a stress gradient loading test apparatus and a method of accurately determining loading energy, relating to the technical field of a rock mechanical test. The apparatus includes an upper pressure-bearing plate, a specimen fixing device, a stress transfer device, and a simulation specimen. A computer processes stress and strain monitoring data. The stress transfer device includes a plurality of plate-like high strength materials in combination. A simulation roadway is opened in the simulation specimen, and a strain gauge and a stress sensor are disposed on the simulation specimen. In a test using the apparatus, stress gradient loading is realized and elastic strain energy is calculated by the plate-like high strength materials with different stiffnesses of the stress transfer device, and loading energy acting on the simulation specimen is calculated in combination with energy applied by a tester.