Disclosed is an exemplary test apparatus having an autoclave head, a fretting mechanism connected on a first end to a first side of the autoclave head, a load train operably connected with a first end of the fretting mechanism, an autoclave adapter connected on a first side to a second side of the autoclave head, and a force balance assembly connected to a second side of the autoclave head and configured to equalize a pressure acting on the load train. Certain exemplary embodiments include an upper plate, a plurality of upper tie rods connected to a first side of the upper plate and a second side of the autoclave adapter, a lower plate, a plurality of lower tie rods connected to the first side of the autoclave head and a first side of the lower plate, and a pressure vessel sealingly connected to the first side of the autoclave head.

An accelerated loading road-testing system includes a plurality of loading mechanisms that 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 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 drive the loading head to move along the third direction, the loading head is configured to interact with a road surface to be tested in order to adjust an angle between the telescopic cylinder and the sliding assembly and is configured to always apply a load to a road surface to be tested in a direction perpendicular to the road surface to be tested.

A method of measuring cement volumetric changes includes loading a sample cement into a flexible container and surrounding the flexible container by a column of fluid in a chamber. The temperature of the column of fluid is adjusted to a cement setting temperature, and the sample cement is allowed to set over several hours. The pressure of the column of fluid is adjusted to a test pressure. The temperature of the column of fluid in the chamber is adjusted to induce volumetric changes in the set cement. As the volume of the set cement changes, fluid volume adjustments are applied to the column of fluid in the chamber to maintain the pressure of the column of fluid in the chamber constant at the test pressure. The volumetric changes in the set cement are determined from the fluid volume adjustments applied to the column of fluid in the chamber.

A device for a creep test and a test system and a method using the device are provided. The device for the creep test includes a device frame, a test piece clamp, a load loading mechanism and linear displacement sensors. A test piece is arranged in a middle of the test piece clamp. A first end of the test piece clamp is a fixed end, a position of the fixed end is unchanged relative to the device frame. A second end of the test piece clamp is a movable end. The load loading mechanism includes a pulley block and a load. A system for a tensile and compressive creep test includes a box body which is sealable. The box body is provided with a box door which is provided with a constant temperature and humidity device. The device for the creep test is arranged in the box body.

A method for evaluating susceptibility to liquid metal embrittlement cracking in a resistance spot welded portion of a steel sheet that enables highly accurate and quantitative evaluation is provided. The method includes: overlapping a first steel sheet and a second steel sheet, one or both of which are galvanized steel sheets, without an intervening gap to obtain a sheet combination, sandwiching the sheet combination between a pair of electrodes, and applying current and pressure via the electrodes to perform resistance spot welding; applying to a welded portion of the second steel sheet at the same time as or after the end of the current application; then observing the welded portion of the second steel sheet to ascertain the presence or absence of liquid metal embrittlement cracking; and evaluating susceptibility to liquid metal embrittlement cracking in the welded portion based on the observation result.

Techniques are described for configuring a materials test system to perform materials tests on sample material(s). Such a materials test system may include a test controller and materials test device(s), which are connected to the test controller. In an embodiment, the materials test system receives input selecting a test controller type for the test controller of the materials test system and input for configuring a materials test device. Without the materials test system being connected with the test controller and the materials test device, generating configuration data based on the inputs. The generated configuration data may be loaded into the test controller, thereby configuring the materials test system.

The present invention discloses a concrete test device and method based on a load-corrosion coupling action, relating to the technical field of corrosion experimental devices for concrete sewage pipelines. The device simulates a real environment of a sewage pipeline based on the load-corrosion coupling action, applies mechanical load and chemical corrosion effects to a concrete specimen simultaneously, and accelerates a corrosion effect on the concrete specimen by exposing the concrete specimen. According to the device, researches on mechanical properties of a concrete material under the load-corrosion coupling action are realized, and an assessment sample basis is provided for researches on aging characteristics of the concrete sewage pipelines. The present invention further discloses a concrete test method based on the aforementioned test device.

The present invention discloses a concrete test device and method based on a load-corrosion coupling action, relating to the technical field of corrosion experimental devices for concrete sewage pipelines. The device simulates a real environment of a sewage pipeline based on the load-corrosion coupling action, applies mechanical load and chemical corrosion effects to a concrete specimen simultaneously, and accelerates a corrosion effect on the concrete specimen by exposing the concrete specimen. According to the device, researches on mechanical properties of a concrete material under the load-corrosion coupling action are realized, and an assessment sample basis is provided for researches on aging characteristics of the concrete sewage pipelines. The present invention further discloses a concrete test method based on the aforementioned test device.

A system for testing rock fracture under a vacuum and extreme-temperature condition includes a vacuum extreme-temperature loading structure, an overall loading frame structure and a mobile cart. The vacuum extreme-temperature loading structure includes a vacuum transparent shield, a vacuum base and an extreme-temperature loading module. A bottom end of the vacuum transparent shield is covered on the vacuum base and is hermetically connected with the vacuum base to form a vacuum structure. The extreme-temperature loading module is provided inside the vacuum structure. The overall loading frame structure includes an overall frame and a loading cylinder. A middle of the overall frame is provided with a loading space, and the vacuum extreme-temperature loading structure is located in the loading space. The mobile cart is located in the loading space and is slidably connected with the overall frame, and the vacuum base is arranged on the mobile cart.

method for selecting a photosensitive resin composition exposing a resin film of a photosensitive resin composition at 100 to 2000 mJ/cm2 and heat-treating the resin film at 150 C. to 5 250 C. for 1 to 3 hours under nitrogen to produce a strip sample of a cured film having a film thickness of 10 m and a width of 10 mm; performing a fatigue test of repeatedly pulling the strip sample under specific conditions; and selecting a photosensitive resin composition satisfying the following condition: the number of times of pulling required until the 15 strip sample breaks in the fatigue test is 100 or more cycles.