Materials Testing - The Role Of Force Testers In Materials Evaluation

Topics Covered

Background
Introduction to Force Testers
Benefits of Mechanical Force Stands
Applications of Motorised Force Testers
Applications of Pneumatic Force Testers
Features of Digital Force Testers
Materials Testers
Summary

Introduction to Force Testers

Sometimes there can be confusion as to the difference between a force tester and a materials tester. Force testers are designed to make basic force measurements in applications where the main interest is in peak load and extension.

A force tester typically uses a force gauge as the load measurement device. Material testers, however, are much more precise and generally offer greater performance levels. A materials tester will use precision load cells and an internal or external extensometer for elongation measurement. Testing under constant loads or when using thermal chambers require a materials tester.

Lloyd Instruments offers the comprehensive range of Chatillon® force testers to complement its extensive range of materials testing instruments. Force testers are available in mechanical, motorised, pneumatic and digital versions. Pneumatic testers are ideally suited for use in areas where intrinsic safety is required.

Benefits of Mechanical Force Stands

Mechanical test stands provide an economical, manual testing system for tensile and compression testing either in a production environment or in the laboratory.

Testers may be equipped with a quick-action lever or precision hand-wheel for controlling crosshead speed and travel. Typically mechanical testers offer capacity up to 2500N (550 lbf).

Applications of Motorised Force Testers

Motorised force testers can be used for tensile, compression, flexural, shear and peel testing. Motorised test stands can have a larger work area making them ideal for production environments or applications with larger test samples. Crosshead speed movement is user-selectable.

Mechanical and digital load limits can be used to control crosshead movement, e.g. stop the crosshead when a load limit is achieved.

Applications of Pneumatic Force Testers

Pneumatically-operated force testers utilize clean, dry compressed air and are ideally suited for use in hazardous areas where no electricity is permitted for fear of explosion. Pneumatic testers can perform both tensile and compressive tests with variable ram speed.

Typical applications include measuring break strength of electrical leads, terminals, connectors, wire wraps, etc

Features of Digital Force Testers

Digital force testers are advanced force testing systems optimized for production, quality control and engineering applications, which can be used for tensile, compression, shear, friction, flexural and complex spring testing.

They can feature a rugged frame with high performance, closed-loop motion control and an intelligent load sensing system with measuring accuracies better than 0.1% full scale. Typically digital force testers are available with force capacities up to 5 kN (1124 lbf).

Self-contained systems require no external computer and no additional control software for operation. Standard test setups for load limits, distance limits, time limits, break tests, rupture tests, cycling and loop tests can be included.

Materials Testers

Materials testing machines guarantee the highest level of performance and capability for production testing, quality control, laboratory testing, research and education, with force capacities ranging from 1 kN (225 lbf) to 300 kN (67443 lbf) Materials testing machines can test for tensile strength, compression, flexure, friction, tear, peel, adhesion, shear, ductility, insertion, shear strength and many other parameters.

They are used to determine the physical and mechanical properties of raw materials and components, and are ideal for product testing of finished goods such as plastics, packaging, medical devices, electronic components, textiles, metals, composites, paper and more. An overview and applications of different types of material testing machines can be found here.

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Summary

Force testers allow routine force measurements to be made quickly and easily in a host of applications. For more accurate or complex measurements, materials testers are the optimum solution.

Source: Lloyd Instruments

For more information on this source please visit Lloyd Instruments

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