In situ biaxial fatigue testing machine: principle, application, and technical value analysis

In the manufacturing fields of aerospace, biomaterials, and flexible electronics, the service performance of materials under complex loads is the lifeline of product safety. Recently, our company's focus on the "in-situ biaxial fatigue testing machine" technology has become a hot topic in the field of materials science due to its ability to crack the mechanical "black box" of materials under real working conditions.

What is' in-situ biaxial fatigue test '?

Unlike traditional uniaxial tensile testing, the in-situ biaxial fatigue testing machine can simultaneously apply tensile, compressive, or alternating fatigue loads to materials in two mutually perpendicular directions, X and Y, simulating the multi-directional stress state that materials bear in structural components such as cross axes and pressure vessel membranes.

The core technological breakthrough lies in the ability to observe in situ. The device can be synchronized with high-precision microscopy equipment such as scanning electron microscopy (SEM), atomic force microscopy (AFM), or optical microscopy through a unique optical path design (such as a transmission structure or gate bracket). This means that R&D personnel can observe the entire evolution process of the internal microstructure of materials (such as lattice slip and crack initiation) in real time and dynamically while conducting "tensile tensile" or "tensile compressive" fatigue tests on the materials.

Experimental principle and core advantages

The equipment usually adopts high rigidity symmetrical ball screw transmission technology and servo control scheme to ensure that the center of the cross shaped specimen is always at the center of the field of view during the test process, making it easy to track. Its main advantages include:

Multi axis complex loading: realizing dual axis proportional, non proportional, and asynchronous loading, simulating various composite working conditions such as compression, creep, and relaxation.

High precision observation: Equipped with long working distance objective lenses or video extensometers, the accuracy can reach micrometer level, and even combined with synchrotron radiation sources for in-situ analysis.

Environmental simulation: Optional water bath, temperature control (-40 ℃ to 300 ℃), and corrosive environment device can be equipped to simulate special environments such as physiological saline and special temperatures.

Widely applicable fields

Aerospace: Testing the fatigue crack propagation law of aviation aluminum and composite materials to provide a basis for structural strength design.

Biomaterials: Simulate the mechanical environment of vascular scaffolds, cartilage, and biological tissues to study their durability in bodily fluid environments.

Flexible electronics and thin films: solving the performance degradation problem of flexible screens and polymer films under repeated folding and stretching.

New Energy and Rock Mechanics: Analyzing the stress changes of battery electrodes during charge discharge cycles and the failure mechanism of deep rocks.