MIC

info@measure-india.com

+91 99899 21114

Creep and Stress Rupture Testing services in India

We have extensive experience across a wide range of industries

How Creep and Stress Rupture Testing Works – Process & Importance

At MIC Labs, maintaining a well-structured Quality sample preparation plays a key role in generating accurate and repeatable test data. Keeping this in view, MIC Labs initiated the establishment of its own sample preparation workshop in 2023. Over time, we have developed a state-of-the-art machining center to extract, prepare, and polish test specimens according to various ASTM, ISO, and IS testing standards.

Our experienced machinists are highly skilled in preparing specimens with tight tolerances as required by the aerospace, defense, manufacturing industries, crucial research projects, and academic programs.

The in-house workshop has also enabled MIC Labs to undertake high-volume testing contracts while ensuring quality and timely deliverables.

Tensile Testing Process

Sample Preparation
A standardized specimen is prepared according to global testing standards like ASTM E8 (for metals), ISO 6892 (for metallic materials), ASTM D638 (for plastics), and ISO 527 (for polymers). The sample can be:

Dog Bone (Dumbbell-Shaped): Common for metals and plastics
Flat Specimen: Used for sheets and thin materials
Round Specimen: Preferred for cylindrical samples
Wire & Fiber Specimen: For thin wires and ropes
Precision in sample machining, surface finish, and alignment ensures accurate results and prevents premature failure.

Tensile Testing Sample Preparation – FAQs

1. Why is sample preparation important in tensile testing?

Sample preparation ensures accurate and repeatable test results by following standardized dimensions set by ASTM, ISO, and other industry standards. Proper machining prevents stress concentrations that could cause premature failure.

2. What are the standard dimensions for tensile test specimens?

Specimen dimensions vary by material and standard:

  • Metals: ASTM E8 / ISO 6892 (Dog bone or round)
  • Plastics: ASTM D638 / ISO 527 (Dumbbell-shaped)
  • Composites: ASTM D3039 (Rectangular)

Thin sheets: ASTM E345 (Flat tensile specimens)

3. How should a tensile test sample be machined?

The specimen should have smooth edges, uniform thickness, and precise gauge length to avoid irregular stress distribution. CNC machining or precision laser cutting is often used to meet tolerance requirements.

4. What is the best material thickness for tensile testing?

Thickness depends on the testing standard and industry. Common thicknesses:

  • Metals: 1.5mm – 12mm
  • Plastics: 3mm – 10mm

Composites: 2mm – 6mm

5. What surface finish is required for tensile test specimens?

A smooth surface finish (Ra ≤ 0.8 µm for metals) minimizes stress concentrations and ensures uniform load distribution, improving test accuracy.

Looking for tensile testing services in India? Get accurate, NABL-certified material testing with advanced Universal Testing Machines (UTMs) today! 

Creep and Stress Rupture Testing – Process & Importance

Testing materials according to various standards requires a wide range of grips and fixtures to securely hold specimens.

Keeping future requirements in mind, MIC Labs has been investing in developing a diverse range of grips and fixtures to accommodate all testing standards and material types.

MIC Labs’ inventory includes over 80 types of grips and fixtures designed for testing at low temperatures, room temperature, and high temperatures, covering a temperature range from -195°C to 1150°C.

Tensile Testing Gripping Process

ADMET Compression Loading Fixture
ADMET Small Vice Grips
ADMET Environmental Chamber
ADMET Threaded Specimen Grips
ADMET Wire Yarn & Twine Grips
ADMET Peel Test Fixture
ADMET Coefficient of friction fixture
ADMET Rope Testing Grips
ADMET Shear Fixtures
ADMET Strain gauged Load Cells
Self-tightening Eccentric Grips
ADMET Manual Vice Grips
ADMET - Point bend fixture
ADMET - Compression platens
ADMET Pneumatic Grips

Specimen Alignment & Placement

The test specimen is positioned correctly to ensure axial loading and prevent bending stresses.
Alignment tools or guides may be used for precision placement.

Grip Selection Based on Material & Shape

Different types of grips are used depending on the material, thickness, and specimen shape:

  • Wedge Grips – Self-tightening for metals and composites
  • Hydraulic Grips – Uniform pressure distribution for high-strength materials
  • Pneumatic Grips – Suitable for delicate materials like textiles and films
  • Vice Grips – Basic mechanical clamping for simple applications
  • Threaded/Pin Grips – Used for wires, rods, and rebar testing

Clamping the Specimen

  • The grips are tightened to prevent movement without damaging the specimen.
  • If required, serrated or textured grips enhance friction to prevent slippage.

Load Application & Monitoring

  • The UTM applies a controlled increasing tensile force to the gripped specimen.
  • Sensors monitor stress-strain behavior, ensuring precise measurements.

Tensile Testing Gripping – FAQs

1. Why is proper gripping important in tensile testing?

Proper gripping ensures that the specimen remains securely held without slippage or premature failure at the grip points. This guarantees accurate stress-strain measurements during tensile testing.

2. What types of grips are used in a Universal Testing Machine (UTM)?

Common grip types include:

  • Wedge Grips – Self-tightening, ideal for metals and composites
  • Hydraulic Grips – Even pressure distribution for high-strength materials
  • Pneumatic Grips – Used for thin or delicate materials like textiles and films
  • Vice Grips – Simple and cost-effective for basic tensile tests

Threaded/Pin Grips – Designed for specific wire, rope, or rebar testing

3. How do you prevent specimen slippage during tensile testing?

To prevent slippage:

  • Use textured or serrated grips for better friction
  • Ensure proper grip pressure without damaging the sample
  • Align the specimen correctly to avoid bending or off-axis loading

4. What is the role of self-aligning grips in tensile testing?

Self-aligning grips adjust to ensure that the load is applied uniformly along the specimen’s axis, preventing stress concentrations and inaccurate results.

5. How do hydraulic and pneumatic grips improve testing accuracy?

Hydraulic and pneumatic grips apply consistent and uniform clamping pressure, reducing manual errors and ensuring reliable tensile strength measurements, especially for high-strength or brittle materials.

Looking for tensile testing services in India? Get accurate, NABL-Certified material testing with advanced Universal Testing Machines (UTMs) today! 

How Creep and Stress Rupture Testing Works – Process & Importance

MIC Labs is equipped to test various materials under tensile loading, meeting the following standard.

  • ASTM E8/E8M – Standard Test Methods for Tension Testing of Metallic Materials
  • ISO 6892-1 – Metallic Materials – Tensile Testing – Part 1: Method of Test at Room Temperature
  • ASTM D638 – Standard Test Method for Tensile Properties of Plastics
  • ISO 527-1 – Plastics – Determination of Tensile Properties – Part 1: General Principles
  • ASTM D882 – Standard Test Method for Tensile Properties of Thin Plastic Sheeting
  • ISO 37 – Rubber, Vulcanized or Thermoplastic – Determination of Tensile Stress-Strain Properties

Tensile Testing – FAQs

1. What is tensile testing, and why is it important?

Tensile testing is a material testing method that measures a material’s strength by applying a controlled tensile (pulling) force until it breaks. It helps determine ultimate tensile strength (UTS), yield strength, elongation, and ductility, making it essential for quality control and product development in industries like aerospace, automotive, and construction.

2. What materials can be tested in a tensile test?

Tensile testing is performed on various materials, including:

Metals & Alloys (Steel, Aluminum, Titanium – ASTM E8, ISO 6892)
Plastics & Polymers (ASTM D638, ISO 527)
Composites & Fibers (ASTM D3039, ISO 14125)
Rubber & Elastomers (ASTM D412, ISO 37)
Textiles & Films (ASTM D882, ISO 527-3)

3. What are the key parameters measured in tensile testing?

Tensile testing provides critical data, including:
Ultimate Tensile Strength (UTS): Maximum stress before fracture
Yield Strength: Stress at which permanent deformation starts
Elongation (%): Material stretchability before breaking
Young’s Modulus: Stiffness or elasticity of the material
Break Point: Load at which the material completely fractures

4. What standards are followed for tensile testing?

Tensile tests follow international standards to ensure consistency and accuracy:

ASTM E8 / ISO 6892 – Metals & Alloys
ASTM D638 / ISO 527 – Plastics & Polymers
ASTM D3039 – Composites
ASTM D882 – Thin Films & Textiles

5. How do Universal Testing Machines (UTMs) perform tensile testing?

A Universal Testing Machine (UTM) applies a gradual tensile force to a properly gripped and aligned specimen until failure. The machine records stress-strain data, helping industries evaluate material performance, durability, and safety compliance.

Looking for tensile testing services in India? Get accurate, NABL-certified material testing with advanced Universal Testing Machines (UTMs) today! 

Scroll to Top