Extensometers

The Core Limitation: Why Crossbar Displacement Distorts Your Strain Data

Relying on crossbar displacement to track material stretch frequently introduces significant measurement errors. The physical bending of the machine frame, gear twist, and grip slippage throw the mathematical calculations off, leaving your team without a reliable foundation of high-integrity data. To capture the exact moment a material permanently warps or snaps, you need dedicated extensometers mounted directly to the gauge-length section of the sample.

Method Selection: Contact Mechanical vs. Advanced Optical Strain Measurement

Choosing the right testing method depends on how your material handles physical contact.

• Contact Extensometry physically rides on the test piece to track stretch with zero guesswork, which is highly useful for rigid materials. However, physical attachment has strict method limits. The weight of a clip-on sensor can sag super soft materials, and the contact points can pinch fragile samples, causing premature failures.
• Non-Contact Extensometry solves this by using advanced optical tracking. By using high-resolution cameras to watch painted markings stretch apart, you get high-fidelity, multi-directional strain data without any risk of slipping, physical interference, or heat damage.

Aligning the Science with the Right Tool

Our range is built to align with these exact physical requirements:

• Clip-On Models (QM-S-Ext): Built specifically to track the pulling behavior of stiff metals and hard plastics that experience less than 50% elongation. These compact devices grab onto your test piece with finely sharpened contact points for direct, highly reliable data.
• Long-Stroke Models (QM-L-Ext): Indispensable for super-stretchy materials like rubber, polyethylene, or woven webbing that stretch past 20% elongation. This mechanical setup provides high-travel tracking over massive extended ranges without breaking apart.
• Video Extensometer (Quantum Series): Our premier non-contact option. By relying on extremely precise camera lenses and smart pixel-tracking technology, it provides real-time strain measurement without touching the material, capturing both vertical stretch and sideways shrinking simultaneously. It is the ideal solution for fragile or high-temperature materials, providing an abundance of highly useful data without the risk of physical slippage.

Comparing Our Strain Measurement Methodologies

Selecting the Right Configuration for Your Lab

Select the method that fits your material to ensure your testing meets rigorous international benchmarks, including ASTM E83 and ISO 9513. Whether your lab requires the heavy-duty tracking of the QM-S-Ext, the high travel of the QM-L-Ext, or the hands-free versatility of the Quantum Series, getting those numbers right is the difference between a product that holds up exactly as it should and one that completely fails in the field. Contact our engineering team today to configure the right testing setup for your facility.