Residual stress tester

Our company mainly engages inStress testerResearch and development, production, and sales of ultrasonic shock equipment and vibration aging equipment. It is a technology enterprise that integrates technology research and development, independent production, sales and installation, and service maintenance. Long term adherence to technological progress has enhanced the company's development potential. Through the introduction of foreign technology and continuous exploration of R&D personnel, the company has successively developed and launched dozens of products in multiple series, including stress detectors, ultrasonic impact equipment, vibration aging equipment, etc. Many of these technologies have obtained national and utility model awards. The company has a complete range of products and advanced technology, and can provide targeted products according to the different needs of customers.

Blind hole methodStress testerBelonging to destructive detection, data analysis is conducted using the induction of strain gauges. Stable to use and easy to operate. In the field of stress detection, it has received widespread praise.

1、 The significance and application of blind hole method for measuring residual stress
Residual stresses exist in almost all structures, and they may be formed during the manufacturing process or generated during the service life of the structure. In many cases, especially when the structure is subjected to alternating loads or working in a corrosive environment, residual stresses are a major factor in structural failure. It is necessary to understand the residual stresses of the structure. Blind hole strain measurement technology is a semi non-destructive method suitable for determining residual stress.
II Basic principle of blind hole method for measuring residual stress
The blind hole method for measuring residual stress refers to drilling a small hole in a location with residual stress. As the residual stress near the hole is released, the residual stress field near the hole area changes. As long as the strain change in the local area is measured, the residual stress value before the release at the drilling site can be calculated.
Assuming there is a residual stress in an isotropic flat plate, if a small hole is drilled, the radial stress at the edge of the hole decreases to zero, and the stress near the hole area is redistributed, as shown in Figure 1. The shaded area represents the change in stress after drilling, which is called the released stress and is sensed by a strain gauge. Usually, surface residual stress is in a planar stress state, with two principal stresses and three unknowns of principal direction angle. It is required to use three strain sensitive grids to form a strain flower for measurement, with the center of each sensitive grid arranged on the same radius

Stress testerMain components:

Host, punching device, shielding wire, power cord, strain gauge, printing paper, fuse tube, product qualification certificate, product user manual.

1、 Using high-speed microcontrollers as the central processing unit and high-precision measurement amplification chips, zero adjustment is not required during measurement, and the magnitude and direction of residual stress values can be directly measured, achieving automation of residual stress measurement.

2、 During the measurement process, the digital tube directly displays the strain values ε 1, ε 2, and ε 3 in three directions caused by stress release, as well as the calculated residual stress values δ 1 and δ 2 and the angle θ of the principal stress direction, which can be viewed by pressing the button.

3、 The equipment adopts independent data acquisition and calculation in three directions, multiple data verification design, and comprehensive anti-interference technologies such as digital filtering and hardware filtering to ensure the accuracy and stability of measurement data.

4、 The device comes with a micro intelligent printer that can print the released strain values in three directions and the calculated residual stress values δ 1, δ 2, as well as the angle θ between the principal stress directions on site.

5、 Corresponding release coefficients A and B values, as well as the sensitivity coefficient of strain gauges, can be set according to the material of the tested workpiece to adapt to different workpieces and strain gauges.

Technical parameters of punching device
Drilling diameter: ￠ 1.0~￠ 3.0mm
Alignment accuracy: 0.025 mm
Drilling depth: 0.5~2mm controllable
Strong magnetic steel adsorption, * replacing the trouble of adhesive bonding in ordinary drilling devices
The drilling device can flexibly drill holes on different constructed planes, surfaces, fillet welds, butt welds, corners, and other prescriptions.

pre-salesLimei Electromechanical will provide targeted technical solutions based on the specific situations reported by customers. Customers can provide on-site guidance as needed.

during-saleLimei Electromechanical will provide on-site installation and commissioning services to customers, as well as free training for technical operators. Explain the usage and precautions of the equipment, as well as common problem-solving methods.

after-sales serviceLimei Electromechanical customers enjoy the lowest equipment warranty period of one year. All quality issues of the equipment during the warranty period are covered by the warranty. The company's after-sales service will be connected 24 hours a day.

The basic steps of the blind hole residual stress tester are as follows:

Select residual stress measurement points on the workpiece, usually the point with the highest residual stress value or the point with the highest load-bearing capacity during use;

Polish the surface of the measured point to a roughness of around Ra0.8;

Clean the polished surface thoroughly with acetone or alcohol;

★ Paste the strain rosette (gauge) on the measured point with fast gel;

★ After the fast gel has solidified, connect the lead wire of the strain gauge on the strain gauge with the measuring wire of the residual stress detector through the wiring terminal;

★ Adjust the residual stress detector to zero;

★ Use a device to drill a blind hole with a diameter of 2mm and a depth of approximately 2.5mm at the center of the strain gauge;

After 15 minutes of drilling, use a detector to measure the amount of stress released after drilling, and automatically calculate the magnitude and direction of residual stress.

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