An instrument and method for mechanical properties in situ testing of materials under a high temperature and complex mechanical loads are provided. The instrument includes: a support frame module used to provide a stable support and an effective vibration isolation for each functional module of the instrument; a high-frequency fatigue load applying module used to apply a high-frequency fatigue load on a tested sample; a static-dynamic mechanical load applying module used to apply a combination of static-dynamic tension/compression/bending loads on the tested sample; a high/low temperature applying module used to apply a variable temperature environment from a low temperature to a high temperature on the tested sample; and an in-situ monitoring module that may integrate a surface deformation damage measurement assembly, a three-dimensional strain measurement assembly, a microstructure measurement assembly, and an internal damage detection assembly according to a practical testing requirement.

A marine climate environment-bending load collaborative acceleration test method is provided, including conducting a static bending load loading test in an outdoor marine climate environment, conducting an alternate cycle of a dynamic bending load loading test in the outdoor marine climate environment and a test in the outdoor marine climate environment, and conducting an alternate cycle of the dynamic bending load loading test and the static bending load loading test in the outdoor marine climate environment. In the present disclosure, an acceleration rate of the marine climate environment-bending load collaborative acceleration test reaches over 8 times that of the test in the outdoor marine climate environment by taking the maximum bending force as an evaluation index, which may achieve a change from a static test to a static and dynamic combined test for examining and evaluating the environmental adaptability of the metal material.

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.

Provided is a load data analysis method for analyzing, based on a rainflow method, load data indicative of a load irregularly and repeatedly applied to an object. The load data analysis method comprises: a first step of acquiring a given amount of load data, and calculating a frequency/frequencies regarding a load amplitude of a load applied to the object and/or a load average, based on the rainflow method, by using load data satisfying a given condition among the given amount of load data; a second step of storing load data failing to satisfy the given condition among the given amount of load data; and a third step of combining the load data stored in the second step with newly-acquired load data to generate the given amount of load data for executing the first step, wherein the first to third steps are repeatedly executed.

Disclosed is a method for compiling an equivalent acceleration spectrum of creep under variable temperatures and loads. The method includes following steps: respectively carrying out a material high-temperature tensile test, material high-temperature creep tests and creep tests under two-stage variable temperatures and loads, and calculating values of a parameter p in a creep damage accumulation model under two-stage variable temperatures and loads; based on a nonlinear damage accumulation model under multi-stage variable temperatures and loads, calculating a damage D caused by a multi-stage variable temperatures and loads creep load spectrum by utilizing values of parameter p; based on the principle of consistency of damage D, transforming the multi-stage variable temperatures and loads creep load spectrum into an equivalent acceleration spectrum of a first-order maximum creep load, and finally compiling the equivalent acceleration spectrum of creep under variable temperatures and loads.

Disclosed is a device for testing corrosion fatigue resistance on the basis of acoustic emission. The device includes: a main machine including a supporting frame and a tensile mechanism arranged on the supporting frame; a clamping mechanism including a first clamp and a second clamp that is arranged opposite the first clamp, where the first clamp and the second clamp are both connected to the tensile mechanism, the tensile mechanism is used for driving the first clamp and the second clamp to move close to or away from each other, the first clamp is provided with an accommodation cavity for accommodating a corrosive substance, the accommodation cavity is provided with an opening that is provided on the first clamp and close to one end of the second clamp, and the first clamp can place a test specimen in the accommodation cavity when fixing the test specimen.

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.

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.

A device for testing mixed-mode fatigue crack growth rate includes a plate-like specimen, and a first fixture mechanism for exerting stretch, shear and torsion actions on the specimen via a second fixture mechanism. The second fixture mechanism is used for clamping the specimen and enabling the specimen to generate a mixed-mode fatigue crack in cooperation with the first fixture mechanism. The device further comprises a fatigue crack measurement instrument for measuring and recording the length of mixed-mode fatigue crack generated on the specimen.

A new vibration test-cell that allows a static load to be applied simultaneously with lateral vibration coupled with in-situ microscopy that allows for the ability to open a fatigue crack up to a desired gap, as well as generate acoustic emission (AE) from vibration excitation, micro-fracture events are captured by the AE measurement while the physical observation of the crack faying surfaces is performed in-situ with an optical microscope embedded in the test cell.