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Direct Tensile Testing

Direct tensile testing is an essential part of geological studies. Subjecting cylindrical rock specimens to direct tensile forces reveals ultimate yield strength and resistance to failure under various tensile loads, which enables more accurate determination of rock properties and in situ performance.

MTS provides a specialized direct tension fixture for rock that ensures optimal conditions are maintained during testing, including alignment of load train and prevention of bending moments. The fixture uses adjustable leaf chains oriented 90° to each other and attached to specimen endcaps, as well as spherical seats integrated into the endcaps that attach the leaf chains to the load frame, load cell and actuator. Other important capabilities for direct tensile testing include:

Robust, reliable rock mechanics test systems
Endcaps and fixturing for attaching specimens to actuators and crosshead of the load 
   frame
Specialized software for advanced data monitoring, acquisition and processing
Technical support from MTS experts with more than 40 years of rock testing
   experience
FlexTest, controller, digital, servohydraulic testing, materials, components, structures

FlexTest Controllers

A versatile, modular digital control platform designed to address a full spectrum of servohydraulic testing applications in materials, components and structures.


Insight, Universal Test System, Monotonic, Test, Tension, Compression, Flex, Bend, Load Frame, Electromechanical

Universal Test Systems

The MTS Criterion® and MTS Exceed® families combine high-performance electromechanical and static-hydraulic load frame technology, easy-to-use MTS TestSuite™ TW software, and a full complement of test accessories to address a full spectrum of monotonic testing demands.