Tensile Testing with High-Speed Data Acquisition

Amazeng Technical Team
6 min read
Tensile TestTensile TestingMetal TestSteel StrengthMaterial Testing

Introduction

Tensile testing is a fundamental laboratory test method for determining mechanical properties of metals and alloys. Critical values such as maximum stress at fracture (MPa), elasticity modulus, and elongation percentage are measured.

Tensile Testing Process

Standard Procedure

  1. Specimen: Standard cylindrical specimen (typically M12 or M16 thread)
  2. Loading: Controlled speed (mm/min) tension
  3. Recording: Stress-strain curve
  4. Analysis: Yield strength, fracture strength, % elongation

Critical Points

  • Yield Point: Where plastic deformation begins
  • Maximum Load: Peak point before fracture
  • Fracture: Moment when specimen breaks

Problems with Traditional Methods

Data Loss

During tensile testing, especially at fracture moment, data loss can occur:

  • Slow Reading: 100-200 Hz devices miss the peak
  • Signal Noise: Low-quality ADC
  • Latency: Interruption in data transfer

Solution: ZMA Series

ZMA's features are ideal for tensile testing:

FeatureValueFor Tensile Testing
ADC24-bitPrecise stress measurement
Speed1000 HzCaptures fracture moment
ConnectionModbus TCPLinux panel integration
ChannelsUp to 8 channelsMultiple specimens simultaneously

ZMA with Tensile Testing Integration

Hardware Connection

Universal Testing Machine (UTM) → Load Cell (100kN) → ZMA-1000 → Modbus TCP → Linux Panel → Database

Linux Panel Options

  • Qt/Embedded Linux: Real-time display
  • Docker Container: Database (InfluxDB)
  • Grafana: Historical analysis
  • Python Script: Automatic calculation

Software Flow

# ZMA data reading example
import pymodbus
client = pymodbus.TcpClient('192.168.1.100', 502)

while True:
    registers = client.read_input_registers(0, 8)
    stress = registers[0] / 1000  # MPa conversion
    strain = registers[1] / 100   # mm conversion
    # Send to Grafana
    influx.write(measurement=stress, tag=strain)

Material-Specific Applications

1. Steel Tensile Testing

  • High-strength steel (S420)
  • High stress values (500-1000 MPa)
  • ZMA's wide input range is ideal

2. Aluminum Tensile Testing

  • Lower stress values (100-300 MPa)
  • 24-bit ADC provides accurate reading at low values

3. Composite Materials

  • Non-linear behavior
  • High speed (1kHz) captures fracture moment

Conclusion

For accurate tensile test results:

  • Min. 500 Hz sampling speed
  • 24-bit ADC resolution
  • Modbus TCP integration

ZMA series meets all requirements. Modernize with ZMA Data Acquisition.

Back to All Posts