Biaxial fatigue testing machine

The biaxial fatigue testing machine is applied to the dynamic and static tests of materials (plate samples, bar samples, etc.), and can achieve both uniaxial and biaxial tests. At the same time, it also has the function of a universal electro-hydraulic servo testing machine.

Applications

♢Dynamic & Static performance research

Test Specimens

♢Composites

Carbon Fiber; Ceramic Matrix Composites; Metal Matrix Composites; Polymer Matrix

♢Metals

Structural Steel; Fasteners; Metal Plate; Metal Rods; Wire and Cable; Sheet Metal; Aluminum; Piping and Tubing; Rebar; Chain

Technical Parameter

Planar biaxial testing frames specification

Parameter	SZL-20	SZL-100	SZL-200	ZQP-300
Max. capacity（kN）	20	100	200	300
Force measure range	2%~100%
Frequency（Hz）	0.001Hz-50Hz
Accuracy	class 1
Displacement range（mm）	0-150mm；
Displacement resolution（mm）	≤0.001
Centering accuracy（mm）	Center positioning deviation range ≤ 0.05mm;
Synchronous mode	Synchronous control of displacement and force values in four directions, or synchronization in pairs;
Deformation measurement	Strain gauge measuring system and corresponding dynamic and static strain gauges (optional)
Environmental devices	High temperature box room temperature+10 ℃ -350 ℃; High temperature furnace 800 ℃ (optional)
Dimension（mm）	30003000500	31703150600	32003200600	33003300600

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Special Case

The SZL-100 Biaxial Tensile Testing Machine adopts servo closed-loop control mode to complete the bi-directional static tensile test of composite materials through the control of the electric cylinder. The system has two control modes: force and displacement. Meets GB/T 36024-2018 Method for Bidirectional Tensile Testing of Thin Plates and Strips of Metallic Materials with Cross Shaped Specimens. It can achieve proportional or non proportional loading of materials; The machine adopts special centering control technology to ensure the center positioning accuracy when four actuators are loaded in the dual axis direction; The program has functions such as data collection, curve drawing, local enlargement or reduction of curves, comparison of single or multiple curve overlay results, print preview, and manual effective revision of data.

It mainly has the following functional characteristics:

The loading actuator is electric and environmentally friendly;
High coaxiality of the equipment, synchronous accuracy of coaxial displacement: not greater than 0.05 mm;
High centering accuracy, with a center positioning offset range of ≤ 0.05mm during testing;
The fixture is a flat push wedge-shaped fixture, which is easy to operate;
It can be equipped with large deformation strain measurement devices and DIC measurement devices;
It can be equipped with various environmental devices, such as high and low temperature environment, lighting, water vapor, etc;

The Biaxial High And Low Temperature Tensile Testing Machine is mainly used for bi-directional static tensile testing of metals and composite materials. The system has two control modes: force and displacement.

It mainly has the following functional characteristics:

Capable of achieving bothforce and displacement closed-loop control, smooth switching;
The loading method is flexible and diverse, allowing for uniaxial and biaxial tensile testing of the specimen;
Protection function: The testing machine has overcurrent, overvoltage, and overtemperature protection, and the software has overload and over displacement protection.
It can achieve full coverage from static to dynamic testing. The whole machine has a compact structure and a large loading space, which can be combined with environmental accessories to complete multi physics field coupling loading tests such as high and low temperatures. No oil, no noise, high reliability.

The High-temperature Micro Motion Fatigue Testing Machine is used for testing the micro motion wear fatigue performance between metal materials in high-temperature environments. It is independently loaded by four servo actuators and adopts a unique dual closed-loop control technology to ensure the controllability of the loading center without affecting the test results. Using the four channel loading controller developed by our company, the main servo cylinder adopts low damping and high response servo actuators, and adopts the principle of electro-hydraulic servo closed-loop control. It has the characteristics of fast response speed, high control accuracy, wide frequency band, and various types of test waveforms.

Product Usage:

Used for testing the micro motion wear fatigue performance between metal materials in high-temperature environments

It mainly has the following functional characteristics:

Capable of achieving both force and displacement closed-loop control, smooth switching;
Adopting dual closed-loop center point control technology;
The loading method is flexible and diverse. In addition to micro motion wear testing, it can also perform uniaxial and biaxial tensile and compressive testing on the sample, and has the function of a universal electro-hydraulic servo testing machine;
Protection function: The testing machine has overcurrent, overvoltage, and overtemperature protection, and the software has overload and over displacement protection.

What is planar biaxial testing?

In our real world, most structures and components bear loads in multiple directions. In order to simulate actual conditions, testing engineers need to be able to stretch the workpiece in multiple directions during the test. The planar biaxial tensile test is different from the uniaxial tensile test in that it not only involves uniaxial loading of the specimen, but also torque loading, which requires the use of additional torque driving devices and driving devices that pass through the crosshead. So, testing machine needs to precisely maintain the workpiece center in the center position while eliminating the risk of generating additional bending stress. In order to further explore the material properties under biaxial tensile stress fields, cross shaped specimens are widely used in such tests. They are usually cross shaped, with four connection points, and the lengths of each arm of the cross are usually equal. This sample shape requires four test axes, with additional test axes being crucial for reproducing constant stress ratios and any combination of stress paths. The cross shaped specimen is analyzed for stress at the intersection point through bidirectional loading (such as vertical and horizontal), in accordance with the detailed guidelines of ISO-FDIS 16842 standard, and is particularly suitable for stress analysis in metal testing.

With the development of jet engines, the demand for planar biaxial testing began to emerge in the 1960s. Aerospace manufacturers pay great attention to the stress state of aircraft structures and need to inspect the structure and components of the aircraft. Another early application was to analyze the grain structure of metal flakes in automotive manufacturing. Not only static tensile test, researchers also focus on dynamic test, like fracture mechanics and fatigue crack propagation.

In China, since the early 1980s, Beihang University has been developing the biaxial tensile testing machine, while in US, MTS systems is the forerunner. In the past decade, some domestic testing machine manufacturers have begun to develop and produce bidirectional testing machines, including three-axis testing machines, mainly used for compression testing of non-metallic materials.

The most challenging aspects of planar biaxial testing include: achieving precise center of mass control; Ensure correct system alignment; Implement test repeatability. To ensure correct alignment, SINOTEST uses a centering device that provides alignment adjustment between fixtures. To minimize bending strain to the greatest extent possible, SINOTEST uses self-produced CMT hydrostatic bearing actuators.