A concrete temperature stress testing machine system including: a concrete temperature stress testing machine and a walk-in environment simulation laboratory system; and the walk-in environment simulation laboratory system includes a walk-in environment simulation laboratory, a host control cabinet, a compressor set room, an environment room control cabinet and a computer. The concrete temperature stress testing machine achieves the temperature deformation self-compensation by using the combination of different proportions of invar and No. 45 steel, an embedded type directly measuring deformation technology of the concrete temperature stress testing is achieved by the fit between the upper and side embedded parts, the embedded rod and the extending rod. The concrete temperature stress testing machine system according to embodiments of the present disclosure may compensate the impact of the temperature deformation by itself and directly measure the true deformation of concrete, thereby having high accuracy, good long-term stability, easy operation and other advantages.

An accelerated loading road-testing system includes a plurality of loading mechanisms. The plurality of loading mechanisms are sequentially arranged along a first direction. The loading mechanism includes a supporting frame, a sliding assembly, and a loading assembly. The supporting frame includes a horizontal supporting beam disposed along a second direction. The horizontal supporting beam has a sliding state in which the horizontal supporting beam slides along a third direction, and a static state in which the horizontal supporting beam is static. The sliding assembly is slidable on the horizontal supporting beam along the second direction. The loading assembly includes a telescopic cylinder and a loading head. A first end of the telescopic cylinder is hinged to the sliding assembly, the second end of the telescopic cylinder is securely connected to the loading head, the telescopic cylinder is configured to always drive the loading head to move along the third direction.

A state quantity acquisition unit acquires a state quantity of a target apparatus including a temperature of the target apparatus. A load specification unit specifies a load history of the target apparatus, based on the state quantity. A remaining life calculation unit calculates a parameter related to a remaining life of the target apparatus for each of a plurality of degradation types, based on the load history specified by the load specification unit.

The hardness of a rail after the rail having a temperature equal to or higher than an austenite region temperature is forcibly cooled in a cooling facility is predicted. A plurality of sets of data for learning composed of a cooling condition data set and output data of hardness are acquired using a model that performs computing by using a cooling condition data set having at least a surface temperature of the rail before the start of cooling and the operating conditions of the cooling facility as input data and the hardness inside the rail after the forced cooling as output data.

An apparatus for measuring mechanical properties of a downhole material, including first and second fixtures each of the fixtures containing a force application fixture to apply a stress to a specimen of the downhole material. A confining sleeve wraps around portions of the first and second fixtures to form a sealed specimen chamber defined by an inner surface of the confining sleeve and ends of the first and second fixtures nearest the specimen. Wall of a confining chamber contain the first and second fixtures, the confining sleeve and the specimen therein. The confining chamber holds a hydraulic fluid therein such that the hydraulic fluid can exert a confining pressure on the confining sleeve to maintain the seal of the specimen chamber and to maintain contact between the inner surface of the confining sleeve and the specimen when the stress is applied to the specimen. First channels pass though one or more of the walls of the confining chamber to add and remove the hydraulic fluid to and from the confining chamber. Second channels pass though one or more of the walls of the confining chamber and through one of the first and second fixtures to add and remove a pore space fluid to and from specimen chamber ports open to the specimen chamber to maintain a pore pressure at the specimen chamber ports that is equal to or less than the confining pressure while the stress is applied to the specimen. A system and method are also disclosed.

An integral tension test system for a large-tonnage basalt fiber anchor cable includes: a plurality of basalt fiber anchoring bars each comprising a basalt fiber reinforced plastic (BFRP) bundle, a steel strand, a first and a second steel casing pipes, the BFRP bundle including a plurality of BFRPs, and a grating array temperature, stress and vibration sensing optical cables bonded in the BFRP; a vibration table and a reaction frame arranged thereon, wherein the first steel casing pipe of the basalt fiber anchoring bar is located in the reaction frame, the steel strand penetrates one end of the reaction frame to be connected to a center hole jack, and the second steel casing pipe of each basalt fiber anchor cable is located outside the reaction frame to be anchored; and a data acquisition module connected to all of the grating array temperature, stress and vibration sensing optical cables.

Disclosed are a test method and algorithm for an aging life of a composite, and a use thereof. The test method and algorithm includes: respectively placing specimens in four temperature environments to undergo damp and hot, high and low temperature impact and high and low temperature alternating cycle for a specified time; testing the physical, chemical and electrical properties of the specimens by using laminated combined test pieces; fitting parameters in a micro-gasification expansion oscillation equation; fitting constants in a kinetic correlation equation (2) of the parameters; calculating new values of the parameters in any temperature environment by using the constant equation (2); and substituting the new values of the parameters back into the equation (1), so as to evaluate or predict the physical, chemical and electrical properties of the specimens at any time.

In a stress measurement method, an object to be measured is vibrated at a plurality of oscillation frequencies, and a temperature amplitude of the object to be measured is measured by using a temperature sensor. Parameters of a one-dimensional heat conduction equation described below are identified by performing curve-fitting, on the basis of the one-dimensional heat conduction equation, on a measurement value of the temperature amplitude with respect to frequency characteristics of a temperature change component and a phase component based on a thermoelastic effect. The frequency characteristics are obtained at the plurality of oscillation frequencies. The one-dimensional heat conduction equation indicates a theoretical solution of a temperature amplitude on a surface of a coating film based on heat conduction and the thermoelastic effect of each of a substrate and the coating film. Then, a stress of the object to be measured is obtained based on the identified parameters.

The present disclosure relates to a method for selecting a photosensitive resin composition, the method including: exposing a resin film of a photosensitive resin composition at 100 to 2000 mJ/cm.sup.2 and heat-treating the resin film at 150° C. to 250° C. for 1 to 3 hours under nitrogen to produce a strip sample of a cured film having a film thickness of 10 μm and a width of 10 mm; performing a fatigue test of repeatedly pulling the strip sample under condition (1) in which the set temperature is 25° C., the distance between chucks is 20 mm, the testing rate is 5 mm/min, and the cyclic load stress is 100 MPa, or under condition (2) in which the set temperature is −55° C., the distance between chucks is 20 mm, the testing rate is 5 mm/min, and the cyclic load stress is 120 MPa; and selecting a photosensitive resin composition satisfying the following condition: the number of times of pulling required until the strip sample breaks in the fatigue test is 100 or more cycles.

Methods, devices, and systems for testing the flexibility of a sample such as an electronic device are provided herein. A testing system can have a motor operably connected to a mandrel such that the motor causes the mandrel to accurately and precisely rotate and cause the sample to conform to an outer surface of the mandrel. Moreover, a proximal end of the sample is secured to the outer surface of the mandrel, and the opposing distal end is controlled by a retractable holder such that the entire sample is subjected to a constant bend radius as the mandrel rotates. Other aspects and features such as controlling the environment around the mandrel and securing small samples to the mandrel are also described herein.