OEM Compression Shear Testing Machine Factory

What is the main test purpose of compression shear testing machine

Definition and function of Compression Shear Testing Machine
Compression Shear Testing Machine is a high-precision device used to measure the mechanical response of materials under compression and shear loads. Its core function is to simulate the complex load state of materials in practical applications, helping researchers to fully grasp the key parameters of materials such as shear strength, compression modulus, yield behavior, plastic deformation capacity and fracture characteristics.
Compared with a single tensile test or compression test, the shear test is closer to the stress state of the material in engineering practice, especially for evaluating interface bonding, interlayer structural stability, cohesive strength and other aspects.
Detailed explanation of the purpose of the test
1. Determine the shear strength and yield limit of the material
Shear strength is one of the basic indicators for evaluating the material's ability to resist shear damage, especially for metal welded joints, composite laminated structures, etc. Through shear testing, the critical point of yield or fracture of the material under shear stress can be accurately determined.
2. Study the interlayer performance of composite materials
Shear testing is particularly critical for new engineering materials such as fiber-reinforced composite materials and honeycomb structures. Through compression shear testing, the interlayer bonding strength between different fiber directions or interfaces can be studied, thus providing a basis for material design and failure analysis.
3. Evaluate the strength stability of adhesive and welding interfaces
In metal structural parts or multi-material connections, the interface performance directly affects the service life of the overall component. Shear testing can effectively evaluate the quality and stability of connection processes such as adhesive bonding, welding, and brazing, and is an important tool for quality inspection and product development.
4. Support the study of the failure mode of structural parts
Through the shear-compression combined loading method, the complex stress state of the material under actual working conditions can be simulated, so as to explore the deformation mode and failure mechanism of the structure during loading, which is helpful for the optimization design of engineering structures.
5. Assist in high and low temperature, fatigue and other environmental tests
Modern compression shear testing machines are usually equipped with accessories such as environmental chambers and high and low temperature loading systems, which can carry out tests under extreme environmental conditions, such as simulating the material properties of aerospace and automotive parts under high or low temperature conditions, greatly improving the practical value of the test.

What are the common faults of compression shear testing machine?

Abnormal loading or unstable loading force
Common phenomena:
Loading speed fluctuates greatly during the test and cannot be kept constant;
The system displays a load that is inconsistent with the actual load;
There is a "shake" or "jump" phenomenon in the low load section.
Possible reasons:
The hydraulic system (or servo motor) has unstable pressure or the oil temperature is too high;
The force sensor has poor contact or aging drift;
The control software parameters are not set correctly or the calibration cycle is too long.
Yiyu Suggestion:
Zhejiang Yiyu Instrument recommends that users calibrate the sensor once a year and check the servo system response curve regularly. All compression shear testing machines of the company are equipped with a highly stable closed-loop servo system and high-precision sensors, and support remote diagnosis and software automatic parameter adjustment, which greatly reduces loading deviation.
Inaccurate displacement measurement or abnormal displacement curve
Common phenomena:
The displacement display value deviates significantly from the actual moving distance;
The displacement data shows a "mutation" or "discontinuous" curve;
Failure to return to zero after the test is completed or the mechanical origin is misplaced.
Possible causes:
The signal of the grating ruler/displacement encoder is disturbed or damaged;
The guide rail sliding system is poorly lubricated or foreign objects are stuck;
The displacement sensor cable connection is loose.
Yiyu Suggestion:
Yiyu Instruments places special emphasis on the cleaning and lubrication maintenance of the displacement system. The company's equipment is calibrated with high precision before leaving the factory, and imported displacement acquisition components are used to ensure that the test accuracy meets international standards. In addition, the company's after-sales engineers can provide "remote self-test software tools" so that users can diagnose the system status and eliminate errors with one click.
Software system failure or test interruption
Common phenomena:
The test software crashes during the test;
Data is not saved or image acquisition fails;
The test report cannot be generated or the export format is wrong.
Possible causes:
The computer operating system is not compatible with the test software;
The software version is old or unauthorized to run;
The communication port is in poor contact or the USB driver is lost.
Yiyu Suggestion:
The software system independently developed by Zhejiang Yiyu Instrument Equipment Co., Ltd. has automatic backup, breakpoint recovery and intelligent error correction functions, which can ensure the safety of test data even in extreme cases. At the same time, the company provides permanent free software upgrade services to ensure that the user system always remains stable and efficient.
The fixture is loose or the center is offset, resulting in test errors
Common phenomena:
The specimen failure form is abnormal and does not conform to the theoretical model;
The shear surface is tilted, and the force value repeatability is poor;
The specimen slips or the clamping force is uneven.
Possible reasons:
The fixture is worn and not replaced in time;
The centering is not fully adjusted during installation;
Non-standard specimens do not use special fixtures.
Yiyu Suggestions:
Yiyu Instruments provides users with a variety of replaceable standard and non-standard fixtures, which can cover different types of specimens such as metal, rubber, composite materials, geotextiles, etc. At the same time, each device is shipped with a fixture calibration reference video to ensure that the operator can accurately master the clamping skills and improve the consistency of the test.
Electrical system alarm or cannot start
Common phenomena:
The system does not respond after startup;
The control panel displays an alarm code;
The button fails, the emergency stop is invalid, or the signal is delayed.
Possible reasons:
Poor power supply contact, unstable voltage;
Aging or internal short circuit of the control circuit;
Abnormal software control logic.
Yiyu Suggestion: To prevent such failures, Yiyu Instruments recommends that users configure a voltage-stabilized power supply or UPS system for the equipment, and formulate a regular maintenance plan based on the frequency of equipment use. The company's after-sales system can realize electronic control system parameter detection and software debugging through remote connection, greatly reducing user waiting time.