5-station durable creep relaxation tensile testing machine | ｜LRD‑5, an efficient solution for testing long-term mechanical properties of polymer materials.

Jinan Liling LRD‑5 five-station durable creep relaxation tensile testing machine can complete the creep and stress relaxation tensile testing of HDPE, UHMWPE, PA6 and other polymer materials at room temperature, high and low temperature, with 5 channels independently controlled and equipped with non-contact video extensometer, which helps scientific research and enterprise material performance evaluation.
During the service of polymer materials, creep deformation and stress relaxation will occur under long-term load. Creep and stress relaxation properties are the key indexes to evaluate the long-term reliability and service life of polymer materials. The traditional single-station testing machine can only complete one set of sample tests at a time, which has long test period and low test efficiency, and it is difficult to meet the research and development needs of large-scale sample comparison testing.
LRD‑5 five-station durable creep relaxation tensile testing machine, independently developed by Jinan Liling Testing Machine Co., Ltd., is specially designed for non-metallic polymer materials such as HDPE, UHMWPE and PA6. It can carry out creep tensile and stress relaxation tensile tests of multiple groups of samples at the same time, covering normal temperature, high and low temperature and multi-environment conditions, giving consideration to test accuracy and test efficiency. It is widely used in scientific research institutes in universities, research laboratories of material enterprises and third-party testing institutions.
First, the core test ability
This equipment supports four kinds of test items, and can complete the mechanical characterization of materials under multiple working conditions:
Creep tensile test at room temperature: used to characterize the creep properties of polymer materials at room temperature;
Normal temperature relaxation tensile test: obtaining the stress relaxation change data of the material at normal temperature;
High-low temperature creep tensile test: simulate extreme temperature environment and check the creep behavior of materials;
High and low temperature relaxation tensile test: to evaluate the stress relaxation characteristics of materials under high and low temperature conditions.
The speed range of equipment displacement control is 0.001‑500mm/min, which can adapt to low-speed long-term creep test and meet the requirements of tensile test at higher speed, and completely reduce the actual service stress scene of raw materials. The five test stations can carry out the test synchronously, and each station can be independently controlled, so as to realize the parallel test of different samples and different test parameters, and greatly shorten the overall test cycle of batch samples.
Second, the whole system configuration and core hardware
The whole system consists of C45.104 50kN widening host, 5 EA002 electronic actuators, 5 5kN high-precision force sensors, 5 sets of hanging tensile clamps, high and low temperature environment box, LVE‑Pro5MH video extensometer, 5-channel Criterion Test multi-channel controller, measurement and control software and computer system.
1. High-rigidity mainframe
The main engine adopts high-rigidity frame structure, with 0.5-level measurement accuracy, and the measurement range of test force is 0.4% to 100% fs. The whole process is not graded and the resolution is constant. The displacement resolution can reach 0.015 μ m.
Effective stroke: 2000mm (excluding fixture)
Test width: 1030mm.
Overall dimensions: 1400×700×2200mm.
The main engine weighs about 500kg, powered by AC220V and has a power of 4kW.
The upper, middle and lower beams are made of QT600‑3 ductile iron, which has excellent vibration reduction performance; Precision ball screw drive, the coaxiality of the whole machine is less than 8%, which ensures the stability of long-term test.
2. EA002 independent electronic actuator
Five independent electronic actuators are equipped, with a maximum test force of 5000N, a maximum displacement of 300mm, a maximum speed of 500mm/min and a displacement accuracy of 10 μ m.. Each station is driven independently, and the stations do not interfere with each other. The fracture of a single sample does not affect the rest stations to continue the test.
3. Wide temperature range high and low temperature environment box
Using liquid nitrogen refrigeration mode, the temperature range is 40℃ ~+200℃, the temperature deviation is ≤ 2℃, and the temperature control resolution is 0.1℃. The box is equipped with a circulating fan system to ensure uniform temperature in the box; 7-inch touch screen with PLC control system can raise the temperature to 200℃ for 30min and lower the temperature to 40℃ for 40min, completely reproducing various working conditions of low temperature and high temperature. The system integrates multiple safety protections, and has the functions of overheating, overload and alarm prompt to ensure the safe operation of long-term unattended tests.
4. LVE Pro 5mh video extensometer (non-contact strain measurement)
Non-contact optical measurement scheme is adopted, which conforms to the ISO9513 standard with 0.5-level accuracy and the highest resolution of 0.8 μ m. It supports longitudinal and transverse two-way strain measurement, and can obtain key parameters of Poisson's ratio and elastic modulus, and is equipped with DIC digital image correlation module.
The equipment is equipped with a dual configuration of conventional camera and high-speed camera: the conventional camera adapts to the conventional rate test; High-speed camera supports up to 25000fps, which is suitable for high-speed stretching scenes; Two cameras support quick switching of quick change board.
The software has the functions of image calibration, filtering and noise reduction, long-term creep unattended collection, real-time and off-line data analysis, support for Excel, pictures and video output, and perfect adaptation to the data collection of creep and relaxation tests for a long time.
5. Criterion Test five-channel controller and measurement and control software
The controller adopts 32-bit ARM high-speed main control chip, which supports 5-channel independent acquisition and closed-loop control, and the three closed-loop smooth switching of force value, displacement and deformation. The sensor has a built-in TEDS chip, which can automatically identify the sensor without repeated calibration.
Support three modes: stress control, strain control and displacement control, which can realize low cycle fatigue waveform test; Ethernet communication, without complex IP settings. Supporting V8.0 multi-channel measurement and control software, Chinese visual interface.
Multi-channel curve synchronous display, superposition and comparison;
User hierarchical authority management;
Compatible with GB, ISO, ASTM, DIN, JIS multinational test standards, supporting custom test schemes;
The test report can be exported in Word, Excel and PDF formats, which is convenient for scientific research and filing.
Equipped with DCH‑80 manual control box, it is convenient to operate on site, and check the operation parameters such as force, displacement and speed in real time.
6. Fixtures and supporting accessories
Five sets of JGGA103A hanging tensile clamps are standard, which are stable in clamping and convenient to disassemble and assemble, and are suitable for polymer plates, profiles and standard spline samples. Complete machine kit, complete set of operating instructions and factory verification certificate.
Third, the core advantages of equipment
Five stations are parallel, and the test efficiency is doubled: five stations can run synchronously or independently, and multiple groups of samples can be compared and tested at one time, which is suitable for new material formula screening and batch sample testing, and saves equipment investment and laboratory space.
Environmental coverage of all working conditions: normal temperature, low temperature and high temperature are integrated, and a set of equipment can complete various tests of creep, stress relaxation and tension, without repeated procurement of multiple equipment.
Non-contact video extensometer: it does not contact the sample, and will not produce additional clamping stress on the soft polymer sample, which is suitable for long-term creep test and supports DIC full-field strain analysis.
High stability, support for long-term unattended: hardware multiple limit protection, software multi-level protection, can continuously carry out hundreds of thousands of hours of creep and relaxation long-term tests.
Home-made independent package: host, controller, software and video extensometer are all self-developed and convenient for later maintenance; Support the customized development of test scheme to meet the personalized test requirements of users.
Fourth, the application field
Polymer laboratories in materials colleges and research institutes of colleges and universities;
R&D quality inspection department of new plastics and polymer materials enterprises;
Third-party material testing institutions;
It is suitable for evaluating the long-term mechanical properties of various polymer engineering plastics such as polyethylene, nylon and ultra-high molecular weight polyethylene.
V. After-sales Service and Delivery Guarantee
Equipment delivery includes installation and debugging of the whole machine and on-site training of operators, including equipment operation, software use and daily maintenance. Provide complete technical data and certificates; Complete factory pre-inspection, site installation and machine acceptance in strict accordance with the contract. At the same time, it provides perfect after-sales technical support to ensure the long-term stable operation of the equipment.
On enterprises
Jinan Liling Testing Machine Co., Ltd. focuses on the research and manufacture of mechanical testing equipment. The enterprise has a number of system certifications such as ISO9001 and CE, and its products serve domestic scientific research and industrial customers. At the same time, they are exported to many overseas countries, which can provide users with customized overall solutions for material testing.