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The Tinius Olsen Stiffness tester is suitable to determine the stiffness characteristics of a broad range of products and materials.
The load is steadily applied by a motor drive and a highly precise indication of load and the resulting angle of bend are simultaneously shown on circular scales.
The load is indicated as 0 to 100% of the range being used and a post is provided so that additional weights can be added to increase the loading capacity.
It is possible to make apparent bending modulus determinations for plastics in accordance with ASTM D747, using a one or a six (1 or 6) inch-pound (or kilogram-centimeter) capacity machine.
Topics Covered Background Optimizing Materials Formulations Using Materials Properties Universal Testing Machines The Various Tests a Universal Testing Machine can Perform Electromechanical Universal Testing Machines Data Acquisition in Modern Universal Testing Machines Tensile Testing Toughness of a Material Flexural Testing Compression Testing Shear Tests Grips and Fixtures Configuration of Universal Testing Machines Load Cells and Load Ratings Load Capacities and Configurations for Testing of Plastics Choosing A Single-or Dual-Column Configuration Controlled Environment Testing Machine Stiffness Computer Driven Machines Reduce Costs Introduction to Tensile, Compression, Tear, Peel and Flexure Testing Load Extension Stress Strain Hooke's Law Modulus of Elasticity Yield Point Ultimate Point Breaking Point Background Using Tinius Olsen equipment it is possible to perform such tests on raw materials such as metals, polymers, textiles, rubbers, adhesives, food as well finished components.
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The operating principle is simple; a specimen is clamped at one end and a controlled load is applied at the other end.
Our machines are designed for use in Research and Quality Control to measure material’s strength and performance. The distance between the clamp and the point at which the controlled load is applied is called the test span and this is adjustable on Tinius Olsen stiffness testers. Using Tinius Olsen equipment it is possible to perform such tests on raw materials such as metals, polymers, textiles, rubbers, adhesives, food as well finished components.


All such tests are designed and implemented by Tinius Olsen in accordance with key international testing standards including ISO, ASTM, EN and other industrial standards. Advances in electronics and data acquisition and analysis software have improved their performance, ease-of-use, and even have led to more attractive pricing. For more information please select the material you wish to test from an Applications tab below or select a Product tab to view our extensive equipment range. Traditionally, most plastics molders and extruders have relied on getting this information from their material suppliers. However, increased interest in improving quality control either of incoming material, or, more importantly, at the end of the manufacturing process, as well as product and process development, has led many processors to consider a UTM when outfitting or upgrading a lab. Twin column tensile tester, with a maximum load capacity of 2,200 lbf (10kN), shown testing some plastics strapping material. Such static tests, commonly performed on plastics with a typical electromechanical universal testing machine, involve loading the specimen generally at speeds ranging from 0.001 to 20-in per min. Most tensile specimens are designed to have the center section narrower than the ends, and thus commonly called “dogbone” specimens. The force needed to pull the specimen apart is determined, along with how much the material stretches before it breaks. The tensile modulus is the ratio of stress to strain below the proportional limit of the material.


However, moderate elongation is beneficial as it permits absorbing rapid impact and shock. As a result, the total area under a stress-strain curve is indicative of overall toughness and a measure of the amount of energy required to break the specimen. It is important in film and sheet products where failures from this type of load can occur, whereas for the design of molded and extruded products it is rarely a factor. In today’s UTMs the columns are usually of a ball screw drive construction to position the moveable crosshead, allowing the workspace to remain between the machine base and the moving crosshead. Whether single- or dual-column, the most commonly used machines in testing plastics are vertical benchtop units.
The same principles apply to horizontal machines which are primarily relegated for use in automated processes that utilize robots to continuously test samples.



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