Custom Universal Testing Machine Manufacturers

What standard tests can the universal testing machine perform?

Tensile Test
Tensile test is the most common and basic mechanical property test method. The Universal Testing Machine controls the movement of the crossbeam to stretch the material and records the changes in load and elongation, thereby obtaining key parameters such as the material's yield strength, tensile strength, elongation after break, and Young's modulus.
Zhejiang Yiyu Instrument Equipment Co., Ltd.'s tensile testing system is fully compatible with the following standards:
GB/T 228.1-2021 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method"
ASTM E8/E8M "Standard Method for Tensile Test of Metallic Materials"
ISO 6892-1 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method"
Thanks to Yiyu's advanced servo control system and high-precision extensometer configuration, our equipment can achieve seamless switching between stress control, strain control, and displacement control, which is particularly suitable for fields with extremely high requirements for tensile precision, such as university research, aerospace, and automobile manufacturing.
Compression Test
Compression test is often used to test the deformation and destructive behavior of foam materials, rubber, composite materials, building structures, etc. under compression. This test can not only be used to determine the compression modulus of the material, but also to evaluate its yield point and ultimate strength.
Yiyu universal testing machine can perform compression tests according to the following standards:
GB/T 7314 "Metallic Materials Room Temperature Compression Test Method"
ASTM D695 "Compression Performance Test of Unreinforced Plastics"
ISO 604 "Plastics-Determination of Compression Properties"
In order to adapt to different material shapes and mechanical properties, Yiyu provides a variety of customized indenters, loading platforms and automatic centering devices to ensure test accuracy and repeatability.
Bending Test (Bending / Flexural Test)
Bending tests are widely used in structural materials such as plates, bars, and pipes, mainly to determine their performance indicators such as flexural strength and flexural modulus.
Yiyu instruments are equipped with three-point and four-point bending fixtures, which are suitable for the following standards:
GB/T 1449 "Fiber-reinforced plastics - Determination of bending properties"
ASTM D790 "Plastic bending properties test method"
ISO 178 "Plastics - Determination of bending properties"
Through high-precision force sensors and displacement measurement systems, our bending test solutions are widely used in research and development and quality inspection in the electronics, automotive, composite materials and other industries.
Shear and peel tests
Shear tests and peel tests are indispensable for evaluating the adhesion properties of adhesive structures, coatings, and composite layer structures. Yiyu universal testing machine, combined with special fixtures and control systems, can accurately complete:
GB/T 2791/2792 single/double-sided peel test
ASTM D3163 shear strength test
ISO 4587 adhesive shear test
This type of test is particularly important in the fields of packaging materials, new energy batteries, structural adhesives, etc.
Cyclic fatigue and creep test (extended function)
In the high-end series of Zhejiang Yiyu Instrument Equipment Co., Ltd., through the servo closed-loop control system and expansion modules, Universal Testing Machine can also perform constant stress creep test, stress relaxation, low-cycle/high-cycle fatigue test, etc. These expansion capabilities make Zhejiang Yiyu Instrument Equipment Co., Ltd. not only a conventional laboratory tool, but also the key core of the scientific research platform.
Standard adaptability and industry service
Zhejiang Yiyu Instrument Equipment Co., Ltd. has long cooperated with many universities, scientific research institutions, and third-party testing institutions across the country. The equipment is compatible with ISO, GB, ASTM, DIN and other international standards, and can customize test procedures and fixture accessories according to user industries.
At present, the company has delivered equipment to thousands of users, which are widely used in:
Aerospace
Automobile and rail transportation
Medical materials
Civil and construction engineering
Polymer and composite material research and development

What conditions must be met for using a universal testing machine for creep or stress relaxation tests

Creep and stress relaxation: the dual core of long-term performance testing
Creep testing refers to the behavior evaluation method of materials that gradually deform over time under constant load (or constant stress) and specific temperature; while stress relaxation testing is to observe how its internal stress decays over time while keeping the initial strain of the material constant.
These two tests usually last from several hours to hundreds of hours, which puts higher requirements on the control stability, measurement accuracy, environmental consistency and data processing capabilities of the equipment.
Key conditions that must be met for creep/stress relaxation tests
1. The equipment has high-precision control capabilities for constant load and constant strain
The electronic servo control system of Zhejiang Yiyu Instrument Equipment Co., Ltd. is based on a closed-loop feedback design, using high-resolution load sensors and displacement encoders to ensure constant load (stress control) or constant displacement (strain control) with small changes throughout the test. For example, when conducting high-temperature creep tests on metals, the force fluctuation is required to be less than ±0.5%, which places strict requirements on the response speed and stability of the control system.
Zhejiang Yiyu Instrument Equipment Co., Ltd.'s high-end series testing machines can switch freely between different control modes to meet the control requirements of creep and relaxation loading conditions in domestic and international standards such as ISO 204, GB/T 2039, and ASTM E139.
2. Ability to adapt to constant temperature environments (such as high-temperature furnaces and low-temperature boxes)
Creep and stress relaxation behaviors usually occur at high temperatures (200°C~1200°C) or at specific temperatures, so precise control of the temperature field is essential.
Zhejiang Yiyu Instrument Equipment Co., Ltd. independently developed and cooperated with a number of temperature control system manufacturers to develop high-temperature furnaces (including three-stage temperature control) and non-contact temperature measurement systems, which can achieve temperature control accuracy within ±1°C and have the ability to operate stably for a long time. They are widely used in hot creep tests of alloy steels, titanium alloys, ceramic materials, etc.
3. System stability and data continuous recording capability for long-term operation
Long-term tests require that the equipment can run continuously for dozens of hours or even weeks. The system needs to be equipped with data acquisition modules and industrial control platforms with strong anti-interference capabilities and perfect redundant design. The control software of Yiyu universal testing machine has multiple functions such as timed storage, power-off protection, and automatic alarm to ensure the integrity and security of data.
4. Customization capability of fixture, extensometer and specimen adaptation
When conducting stress relaxation tests, the key to maintaining a fixed initial strain lies in the rigidity and stability of the fixture design. Zhejiang Yiyu Instrument Equipment Co., Ltd. provides a variety of self-locking anti-slip fixtures and supports customized high-temperature extensometers to achieve real-time monitoring of micro-deformations (±0.5μm accuracy) at high temperatures to ensure the effectiveness of constant strain control.
For the size, shape, and performance characteristics of specimens of different materials (such as thermoplastics, welded joints, high-strength bolts, etc.), Yiyu Instrument Equipment can provide exclusive fixture and test program customization services to comprehensively improve the applicability of the test.

How to calibrate the load, displacement and speed of the universal testing machine

Load calibration: ensure the accuracy of force measurement
The load system is the "heart" of the Universal Testing Machine. Its calibration mainly corrects the deviation between the output signal of the force sensor (usually a resistance strain gauge) and the standard force value.
Calibration standard
National standard: GB/T 16825.1 "Verification of static uniaxial testing machines Part 1: Force measurement systems for inspection and calibration"
International standard: ISO 7500-1, ASTM E4
Calibration conditions
Use a certified standard force sensor (such as a calibration certificate issued by the National Institute of Metrology);
Use a graded loading method (usually 20%, 40%, 60%, 80%, 100% full scale) for force comparison;
The calibration environment temperature is controlled at 20±2℃ to avoid thermal drift affecting the sensor response;
The calibration system needs to cooperate with Yiyu's self-developed control software to automatically collect the difference between the output value and the standard value under each level of loading.
Yiyu Practical Advantages
The force channel of Yiyu Instrument Equipment uses a 24-bit high-resolution A/D converter, combined with a multi-segment linear correction algorithm, which can achieve a measurement accuracy of ±0.5% or better after calibration, meeting the needs of precision material mechanics research and high-standard factory inspection.
Displacement calibration: Ensure the authenticity and reliability of deformation measurement
Displacement measurement is related to the accuracy of strain calculation, elastic modulus evaluation and stress-strain curve. Displacement calibration is mainly to correct the error of the frame stroke system (encoder/grating) or extensometer system.
Calibration standard
GB/T 12160 "Calibration method of extensometer"
ISO 9513 "Calibration of extensometer in material testing machine"
Calibration process
Use standard gauge blocks or laser interferometers to measure actual displacement;
Record the difference between the displayed displacement of the testing machine system and the standard displacement at fixed intervals;
Perform linear fitting or multi-point interpolation correction on the system displacement output curve.
Special Note
Yiyu Instrument Equipment provides two types of displacement measurement solutions:
Built-in encoder system (for precision control of the overall movement of the indenter or fixture);
High-precision extensometer (for local strain measurement, often used to capture the yield point of metal materials).
Through the "displacement compensation calibration function" built into the Yiyu Instrument Equipment software, users can quickly complete calibration to improve repeatability and linearity.
Speed ​​calibration: Control the stability of the loading process
The loading speed affects the strain rate characteristics of the test results, especially in the analysis of tensile yield and fracture behavior. Speed ​​calibration is to confirm whether the moving speed of the testing machine meets the set value.
Calibration method
Use a laser rangefinder, displacement sensor or stopwatch in combination with a standard scale plate to measure the distance the crossbeam moves per unit time;
Calculate the error between the actual speed and the set value, and the error should be controlled within ±1% (according to the test level requirements);
Speed ​​calibration should be performed without a specimen and no load to avoid load interference.
Yiyu Instrument Equipment Solution
Yiyu Instrument Equipment introduces a high-precision servo motor drive system, combined with a self-developed closed-loop speed control module, to achieve stable speed control from 0.001 mm/min to 1000 mm/min, suitable for slow stretching (such as plastic creep), fast compression (such as metal impact) and other working conditions.
Calibration cycle and traceability system
To ensure the continuous and stable operation of the equipment, Yiyu Instrument Equipment recommends that users perform a comprehensive calibration once a year, and provide original factory calibration services or on-site services. All calibration data can be exported into a PDF report, which meets the requirements of ISO 17025 metrology system certification and ensures the integrity of the enterprise quality system.