Constant elongation stress meter

A Constant Elongation Stress Meter is a specialized testing device designed to measure the stress relaxation behavior of materials under a constant elongation. Essentially, it stretches a material sample (like rubber, elastomers, or polymers) to a predetermined length and monitors how the internal stress decreases over time.

Standard

constant tensile stress meter conforms to the standard GB/T 21461.2-2008 Plastic ultra-high molecular weight polyethylene (PE-UHMW) molding and extrusion materials Part 2: specimen preparation and performance determination, I SO11542-2: 1998.

Usage

Constant tensile stress meter is an instrument to determine the tensile stress of molded plastic materials. It is also a kind of instrument used to characterize the index of PE-UHMW viscosity properties.

Features

1、This tester adopts single-chip microprocessor and temperature control module as the main control unit, featuring stable use and reliable action.

2、Lifting control is controlled by metal proximity switch, and the main transmission part is precision ball screw.

3、Measurement of stretching length adopts photoelectric sensor to sense the signal.

4、The design of brake adopts the downward sliding structure without lateral movement, and the electric control opens automatically. The front and back of the thermostatic oil bath are equipped with high temperature resistant tempered glass to increase the observability of the test.

5. The operation terminal (computer) is installed with Windows system and the software used in this test, and the user does not need to install it again. The role of the base is specially designed for this test machine, the user in addition to its use as the base of the instrument, but also can be used as a storage cabinet for accessories.

Technical parameters

1、 weight quality: 80g, 100g, 120g, 150g, 180g, 200g, 225g, 250g, 275g, 300g, 325g, 350g, 40 0g, 500g, 600g, 700g, 800g (can be increased according to user requirements)

2、Timing accuracy: 0.1 seconds

3、Extension measurement: 90mm

4、Temperature range: room temperature - 150 ℃ (according to user requirements)

5、Heating medium: phenylmethyl silicone oil

6、Sample size: dumbbell type 50*4

7、Voltage：220V 50Hz

8、Power: 6.3KW

Accessories

A complete constant elongation stress meter usually comes with the following accessories:

(1)Sample Clamps/Grips – Secure the material at both ends; may include flat or pneumatic grips depending on sample type.

(2)Load Cell / Force Sensor – Measures tensile stress accurately in real time.

(3)Extension Mechanism – Manual or motorized system to elongate the sample to a preset length.

(4)Temperature Control Chamber (Optional) – Allows testing at controlled temperatures (e.g., for rubber or polymer aging studies).

(5)Data Acquisition System – Connected to a computer or built-in display to record stress vs. time data.

(6)Software/Touch Screen Interface – For setting test parameters, monitoring real-time data, and exporting results.

(7)Calibration Weights / Standard Samples – For verifying measurement accuracy.

(8)Protective Safety Guards – Ensures operator safety during testing.

Test Procedures

The operation of a constant elongation stress meter typically follows these steps:

(1)Sample Preparation

Cut the material (rubber, elastomer, or polymer film) into standard dimensions according to relevant standards.

Measure thickness and width for accurate stress calculation.

(2)Mounting the Sample

Place the sample securely between the upper and lower clamps.

Ensure there is no initial slack, twist, or uneven alignment.

(3)Set Test Parameters

Input the constant elongation value (e.g., 10%, 20% of original length).

Set the test duration for which stress relaxation will be recorded.

If applicable, set temperature or environmental conditions.

(4)Start the Test

Gradually elongate the sample to the preset length.

The system will maintain the elongation constant during the test.

Sensors measure the initial stress immediately after elongation.

(5)Data Recording

The machine continuously records stress decay over time.

Data is typically displayed in real-time stress vs. time curves.

(6)Test Completion

Once the preset duration is reached, the machine stops automatically.

Carefully release the clamps and remove the sample.

(7)Data Analysis

Analyze the stress relaxation curve to calculate parameters like:

Relaxation modulus

% stress decay over time

Material durability prediction

(8)Reporting

Export results in CSV, PDF, or proprietary software formats for documentation, quality control, or research purposes.

FAQ

1. What is this product?

The Constant Elongation Stress Meter is a precision testing device designed to measure the stress relaxation behavior of materials under a fixed elongation.

2. What is this product used for?

This device is mainly used to:

Evaluate stress relaxation of materials under constant elongation.

Assess mechanical properties like elasticity, tensile stress retention, and long-term durability.

Test rubber, elastomers, polymers, films, and composite materials.

Provide data for material selection, quality control, and research & development.

3. How does this product work?

The operation principle involves:

Mounting a prepared material sample in the device’s clamps.

Applying a predetermined elongation to the sample.

Maintaining that elongation constant throughout the test.

Measuring the decay of stress over time using load cells or force sensors.

Recording data via an integrated or external computer system to produce stress vs. time curves for analysis.

4. Why is this product important?

The Constant Elongation Stress Meter is crucial because:

It provides precise insights into material durability under sustained loads.

Helps predict service life and performance for critical components.

Supports quality assurance and product optimization for manufacturers.

Enables research on new materials and their behavior in real-world conditions.

5. Which industries is this product suitable for?

This device is widely used across industries that rely on elastic or polymer materials, including:

Automotive & Aerospace: for rubber seals, gaskets, and vibration components.

Rubber & Plastics Manufacturing: for quality control and material development.

Electronics & Film Production: for thin polymer films and flexible materials.

Research & Academic Institutions: for material science studies and mechanical testing.

Medical Device Manufacturing: for testing elastomeric medical components like tubing or seals.